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   1# SPDX-License-Identifier: GPL-2.0
   2VERSION = 5
   3PATCHLEVEL = 3
   4SUBLEVEL = 0
   5EXTRAVERSION =
   6NAME = Bobtail Squid
   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 $@ :<
  68#
  69# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70# If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71#
  72# To put more focus on warnings, be less verbose as default
  73# Use 'make V=1' to see the full commands
  74
  75ifeq ("$(origin V)", "command line")
  76  KBUILD_VERBOSE = $(V)
  77endif
  78ifndef KBUILD_VERBOSE
  79  KBUILD_VERBOSE = 0
  80endif
  81
  82ifeq ($(KBUILD_VERBOSE),1)
  83  quiet =
  84  Q =
  85else
  86  quiet=quiet_
  87  Q = @
  88endif
  89
  90# If the user is running make -s (silent mode), suppress echoing of
  91# commands
  92
  93ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  94  quiet=silent_
  95endif
  96
  97export quiet Q KBUILD_VERBOSE
  98
  99# Kbuild will save output files in the current working directory.
 100# This does not need to match to the root of the kernel source tree.
 101#
 102# For example, you can do this:
 103#
 104#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 105#
 106# If you want to save output files in a different location, there are
 107# two syntaxes to specify it.
 108#
 109# 1) O=
 110# Use "make O=dir/to/store/output/files/"
 111#
 112# 2) Set KBUILD_OUTPUT
 113# Set the environment variable KBUILD_OUTPUT to point to the output directory.
 114# export KBUILD_OUTPUT=dir/to/store/output/files/; make
 115#
 116# The O= assignment takes precedence over the KBUILD_OUTPUT environment
 117# variable.
 118
 119# Do we want to change the working directory?
 120ifeq ("$(origin O)", "command line")
 121  KBUILD_OUTPUT := $(O)
 122endif
 123
 124ifneq ($(KBUILD_OUTPUT),)
 125# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 126# expand a shell special character '~'. We use a somewhat tedious way here.
 127abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 128$(if $(abs_objtree),, \
 129     $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 130
 131# $(realpath ...) resolves symlinks
 132abs_objtree := $(realpath $(abs_objtree))
 133else
 134abs_objtree := $(CURDIR)
 135endif # ifneq ($(KBUILD_OUTPUT),)
 136
 137ifeq ($(abs_objtree),$(CURDIR))
 138# Suppress "Entering directory ..." unless we are changing the work directory.
 139MAKEFLAGS += --no-print-directory
 140else
 141need-sub-make := 1
 142endif
 143
 144abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 145
 146ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 147$(error source directory cannot contain spaces or colons)
 148endif
 149
 150ifneq ($(abs_srctree),$(abs_objtree))
 151# Look for make include files relative to root of kernel src
 152#
 153# This does not become effective immediately because MAKEFLAGS is re-parsed
 154# once after the Makefile is read. We need to invoke sub-make.
 155MAKEFLAGS += --include-dir=$(abs_srctree)
 156need-sub-make := 1
 157endif
 158
 159ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 160# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 161# We need to invoke sub-make to avoid implicit rules in the top Makefile.
 162need-sub-make := 1
 163# Cancel implicit rules for this Makefile.
 164$(lastword $(MAKEFILE_LIST)): ;
 165endif
 166
 167export abs_srctree abs_objtree
 168export sub_make_done := 1
 169
 170ifeq ($(need-sub-make),1)
 171
 172PHONY += $(MAKECMDGOALS) sub-make
 173
 174$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 175        @:
 176
 177# Invoke a second make in the output directory, passing relevant variables
 178sub-make:
 179        $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 180
 181endif # need-sub-make
 182endif # sub_make_done
 183
 184# We process the rest of the Makefile if this is the final invocation of make
 185ifeq ($(need-sub-make),)
 186
 187# Do not print "Entering directory ...",
 188# but we want to display it when entering to the output directory
 189# so that IDEs/editors are able to understand relative filenames.
 190MAKEFLAGS += --no-print-directory
 191
 192# Call a source code checker (by default, "sparse") as part of the
 193# C compilation.
 194#
 195# Use 'make C=1' to enable checking of only re-compiled files.
 196# Use 'make C=2' to enable checking of *all* source files, regardless
 197# of whether they are re-compiled or not.
 198#
 199# See the file "Documentation/dev-tools/sparse.rst" for more details,
 200# including where to get the "sparse" utility.
 201
 202ifeq ("$(origin C)", "command line")
 203  KBUILD_CHECKSRC = $(C)
 204endif
 205ifndef KBUILD_CHECKSRC
 206  KBUILD_CHECKSRC = 0
 207endif
 208
 209# Use make M=dir to specify directory of external module to build
 210# Old syntax make ... SUBDIRS=$PWD is still supported
 211# Setting the environment variable KBUILD_EXTMOD take precedence
 212ifdef SUBDIRS
 213  $(warning ================= WARNING ================)
 214  $(warning 'SUBDIRS' will be removed after Linux 5.3)
 215  $(warning )
 216  $(warning If you are building an individual subdirectory)
 217  $(warning in the kernel tree, you can do like this:)
 218  $(warning $$ make path/to/dir/you/want/to/build/)
 219  $(warning (Do not forget the trailing slash))
 220  $(warning )
 221  $(warning If you are building an external module,)
 222  $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 223  $(warning ==========================================)
 224  KBUILD_EXTMOD ?= $(SUBDIRS)
 225endif
 226
 227ifeq ("$(origin M)", "command line")
 228  KBUILD_EXTMOD := $(M)
 229endif
 230
 231export KBUILD_CHECKSRC KBUILD_EXTMOD
 232
 233ifeq ($(abs_srctree),$(abs_objtree))
 234        # building in the source tree
 235        srctree := .
 236        building_out_of_srctree :=
 237else
 238        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 239                # building in a subdirectory of the source tree
 240                srctree := ..
 241        else
 242                srctree := $(abs_srctree)
 243        endif
 244        building_out_of_srctree := 1
 245endif
 246
 247ifneq ($(KBUILD_ABS_SRCTREE),)
 248srctree := $(abs_srctree)
 249endif
 250
 251objtree         := .
 252VPATH           := $(srctree)
 253
 254export building_out_of_srctree srctree objtree VPATH
 255
 256# To make sure we do not include .config for any of the *config targets
 257# catch them early, and hand them over to scripts/kconfig/Makefile
 258# It is allowed to specify more targets when calling make, including
 259# mixing *config targets and build targets.
 260# For example 'make oldconfig all'.
 261# Detect when mixed targets is specified, and make a second invocation
 262# of make so .config is not included in this case either (for *config).
 263
 264version_h := include/generated/uapi/linux/version.h
 265old_version_h := include/linux/version.h
 266
 267clean-targets := %clean mrproper cleandocs
 268no-dot-config-targets := $(clean-targets) \
 269                         cscope gtags TAGS tags help% %docs check% coccicheck \
 270                         $(version_h) headers headers_% archheaders archscripts \
 271                         %asm-generic kernelversion %src-pkg
 272no-sync-config-targets := $(no-dot-config-targets) install %install \
 273                           kernelrelease
 274
 275config-targets  := 0
 276mixed-targets   := 0
 277dot-config      := 1
 278may-sync-config := 1
 279
 280ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 281        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 282                dot-config := 0
 283        endif
 284endif
 285
 286ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 287        ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 288                may-sync-config := 0
 289        endif
 290endif
 291
 292ifneq ($(KBUILD_EXTMOD),)
 293        may-sync-config := 0
 294endif
 295
 296ifeq ($(KBUILD_EXTMOD),)
 297        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 298                config-targets := 1
 299                ifneq ($(words $(MAKECMDGOALS)),1)
 300                        mixed-targets := 1
 301                endif
 302        endif
 303endif
 304
 305# For "make -j clean all", "make -j mrproper defconfig all", etc.
 306ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 307        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 308                mixed-targets := 1
 309        endif
 310endif
 311
 312# install and modules_install need also be processed one by one
 313ifneq ($(filter install,$(MAKECMDGOALS)),)
 314        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 315                mixed-targets := 1
 316        endif
 317endif
 318
 319ifeq ($(mixed-targets),1)
 320# ===========================================================================
 321# We're called with mixed targets (*config and build targets).
 322# Handle them one by one.
 323
 324PHONY += $(MAKECMDGOALS) __build_one_by_one
 325
 326$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 327        @:
 328
 329__build_one_by_one:
 330        $(Q)set -e; \
 331        for i in $(MAKECMDGOALS); do \
 332                $(MAKE) -f $(srctree)/Makefile $$i; \
 333        done
 334
 335else
 336
 337include scripts/Kbuild.include
 338
 339# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 340KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 341KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 342export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 343
 344include scripts/subarch.include
 345
 346# Cross compiling and selecting different set of gcc/bin-utils
 347# ---------------------------------------------------------------------------
 348#
 349# When performing cross compilation for other architectures ARCH shall be set
 350# to the target architecture. (See arch/* for the possibilities).
 351# ARCH can be set during invocation of make:
 352# make ARCH=ia64
 353# Another way is to have ARCH set in the environment.
 354# The default ARCH is the host where make is executed.
 355
 356# CROSS_COMPILE specify the prefix used for all executables used
 357# during compilation. Only gcc and related bin-utils executables
 358# are prefixed with $(CROSS_COMPILE).
 359# CROSS_COMPILE can be set on the command line
 360# make CROSS_COMPILE=ia64-linux-
 361# Alternatively CROSS_COMPILE can be set in the environment.
 362# Default value for CROSS_COMPILE is not to prefix executables
 363# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 364ARCH            ?= $(SUBARCH)
 365
 366# Architecture as present in compile.h
 367UTS_MACHINE     := $(ARCH)
 368SRCARCH         := $(ARCH)
 369
 370# Additional ARCH settings for x86
 371ifeq ($(ARCH),i386)
 372        SRCARCH := x86
 373endif
 374ifeq ($(ARCH),x86_64)
 375        SRCARCH := x86
 376endif
 377
 378# Additional ARCH settings for sparc
 379ifeq ($(ARCH),sparc32)
 380       SRCARCH := sparc
 381endif
 382ifeq ($(ARCH),sparc64)
 383       SRCARCH := sparc
 384endif
 385
 386# Additional ARCH settings for sh
 387ifeq ($(ARCH),sh64)
 388       SRCARCH := sh
 389endif
 390
 391KCONFIG_CONFIG  ?= .config
 392export KCONFIG_CONFIG
 393
 394# SHELL used by kbuild
 395CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 396          else if [ -x /bin/bash ]; then echo /bin/bash; \
 397          else echo sh; fi ; fi)
 398
 399HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 400HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 401HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 402
 403HOSTCC       = gcc
 404HOSTCXX      = g++
 405KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 406                -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 407                $(HOSTCFLAGS)
 408KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 409KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 410KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 411
 412# Make variables (CC, etc...)
 413AS              = $(CROSS_COMPILE)as
 414LD              = $(CROSS_COMPILE)ld
 415CC              = $(CROSS_COMPILE)gcc
 416CPP             = $(CC) -E
 417AR              = $(CROSS_COMPILE)ar
 418NM              = $(CROSS_COMPILE)nm
 419STRIP           = $(CROSS_COMPILE)strip
 420OBJCOPY         = $(CROSS_COMPILE)objcopy
 421OBJDUMP         = $(CROSS_COMPILE)objdump
 422OBJSIZE         = $(CROSS_COMPILE)size
 423PAHOLE          = pahole
 424LEX             = flex
 425YACC            = bison
 426AWK             = awk
 427INSTALLKERNEL  := installkernel
 428DEPMOD          = /sbin/depmod
 429PERL            = perl
 430PYTHON          = python
 431PYTHON2         = python2
 432PYTHON3         = python3
 433CHECK           = sparse
 434
 435CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 436                  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 437NOSTDINC_FLAGS :=
 438CFLAGS_MODULE   =
 439AFLAGS_MODULE   =
 440LDFLAGS_MODULE  =
 441CFLAGS_KERNEL   =
 442AFLAGS_KERNEL   =
 443LDFLAGS_vmlinux =
 444
 445# Use USERINCLUDE when you must reference the UAPI directories only.
 446USERINCLUDE    := \
 447                -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 448                -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 449                -I$(srctree)/include/uapi \
 450                -I$(objtree)/include/generated/uapi \
 451                -include $(srctree)/include/linux/kconfig.h
 452
 453# Use LINUXINCLUDE when you must reference the include/ directory.
 454# Needed to be compatible with the O= option
 455LINUXINCLUDE    := \
 456                -I$(srctree)/arch/$(SRCARCH)/include \
 457                -I$(objtree)/arch/$(SRCARCH)/include/generated \
 458                $(if $(building_out_of_srctree),-I$(srctree)/include) \
 459                -I$(objtree)/include \
 460                $(USERINCLUDE)
 461
 462KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 463KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 464                   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 465                   -Werror=implicit-function-declaration -Werror=implicit-int \
 466                   -Wno-format-security \
 467                   -std=gnu89
 468KBUILD_CPPFLAGS := -D__KERNEL__
 469KBUILD_AFLAGS_KERNEL :=
 470KBUILD_CFLAGS_KERNEL :=
 471KBUILD_AFLAGS_MODULE  := -DMODULE
 472KBUILD_CFLAGS_MODULE  := -DMODULE
 473KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 474KBUILD_LDFLAGS :=
 475GCC_PLUGINS_CFLAGS :=
 476CLANG_FLAGS :=
 477
 478export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 479export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
 480export PERL PYTHON PYTHON2 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
 489export KBUILD_ARFLAGS
 490
 491# Files to ignore in find ... statements
 492
 493export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 494                          -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 495                          -prune -o
 496export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 497                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
 498
 499# ===========================================================================
 500# Rules shared between *config targets and build targets
 501
 502# Basic helpers built in scripts/basic/
 503PHONY += scripts_basic
 504scripts_basic:
 505        $(Q)$(MAKE) $(build)=scripts/basic
 506        $(Q)rm -f .tmp_quiet_recordmcount
 507
 508PHONY += outputmakefile
 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)ln -fsn $(srctree) source
 517        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 518        $(Q)test -e .gitignore || \
 519        { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 520endif
 521
 522ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 523ifneq ($(CROSS_COMPILE),)
 524CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 525GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 526CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 527GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 528endif
 529ifneq ($(GCC_TOOLCHAIN),)
 530CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 531endif
 532ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
 533CLANG_FLAGS     += -no-integrated-as
 534endif
 535CLANG_FLAGS     += -Werror=unknown-warning-option
 536KBUILD_CFLAGS   += $(CLANG_FLAGS)
 537KBUILD_AFLAGS   += $(CLANG_FLAGS)
 538export CLANG_FLAGS
 539endif
 540
 541# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 542# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 543# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 544# and from include/config/auto.conf.cmd to detect the compiler upgrade.
 545CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 546
 547ifeq ($(config-targets),1)
 548# ===========================================================================
 549# *config targets only - make sure prerequisites are updated, and descend
 550# in scripts/kconfig to make the *config target
 551
 552# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 553# KBUILD_DEFCONFIG may point out an alternative default configuration
 554# used for 'make defconfig'
 555include arch/$(SRCARCH)/Makefile
 556export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 557
 558config: scripts_basic outputmakefile FORCE
 559        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 560
 561%config: scripts_basic outputmakefile FORCE
 562        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 563
 564else
 565# ===========================================================================
 566# Build targets only - this includes vmlinux, arch specific targets, clean
 567# targets and others. In general all targets except *config targets.
 568
 569# If building an external module we do not care about the all: rule
 570# but instead _all depend on modules
 571PHONY += all
 572ifeq ($(KBUILD_EXTMOD),)
 573_all: all
 574else
 575_all: modules
 576endif
 577
 578# Decide whether to build built-in, modular, or both.
 579# Normally, just do built-in.
 580
 581KBUILD_MODULES :=
 582KBUILD_BUILTIN := 1
 583
 584# If we have only "make modules", don't compile built-in objects.
 585# When we're building modules with modversions, we need to consider
 586# the built-in objects during the descend as well, in order to
 587# make sure the checksums are up to date before we record them.
 588
 589ifeq ($(MAKECMDGOALS),modules)
 590  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 591endif
 592
 593# If we have "make <whatever> modules", compile modules
 594# in addition to whatever we do anyway.
 595# Just "make" or "make all" shall build modules as well
 596
 597ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 598  KBUILD_MODULES := 1
 599endif
 600
 601ifeq ($(MAKECMDGOALS),)
 602  KBUILD_MODULES := 1
 603endif
 604
 605export KBUILD_MODULES KBUILD_BUILTIN
 606
 607ifeq ($(dot-config),1)
 608include include/config/auto.conf
 609endif
 610
 611ifeq ($(KBUILD_EXTMOD),)
 612# Objects we will link into vmlinux / subdirs we need to visit
 613init-y          := init/
 614drivers-y       := drivers/ sound/
 615drivers-$(CONFIG_SAMPLES) += samples/
 616drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
 617net-y           := net/
 618libs-y          := lib/
 619core-y          := usr/
 620virt-y          := virt/
 621endif # KBUILD_EXTMOD
 622
 623# The all: target is the default when no target is given on the
 624# command line.
 625# This allow a user to issue only 'make' to build a kernel including modules
 626# Defaults to vmlinux, but the arch makefile usually adds further targets
 627all: vmlinux
 628
 629CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 630        $(call cc-option,-fno-tree-loop-im) \
 631        $(call cc-disable-warning,maybe-uninitialized,)
 632export CFLAGS_GCOV
 633
 634# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 635ifdef CONFIG_FUNCTION_TRACER
 636  CC_FLAGS_FTRACE := -pg
 637endif
 638
 639RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 640RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 641RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 642RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 643RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 644RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 645export RETPOLINE_CFLAGS
 646export RETPOLINE_VDSO_CFLAGS
 647
 648# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 649# values of the respective KBUILD_* variables
 650ARCH_CPPFLAGS :=
 651ARCH_AFLAGS :=
 652ARCH_CFLAGS :=
 653include arch/$(SRCARCH)/Makefile
 654
 655ifeq ($(dot-config),1)
 656ifeq ($(may-sync-config),1)
 657# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 658# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 659# because some architectures define CROSS_COMPILE there.
 660include include/config/auto.conf.cmd
 661
 662$(KCONFIG_CONFIG):
 663        @echo >&2 '***'
 664        @echo >&2 '*** Configuration file "$@" not found!'
 665        @echo >&2 '***'
 666        @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 667        @echo >&2 '*** "make menuconfig" or "make xconfig").'
 668        @echo >&2 '***'
 669        @/bin/false
 670
 671# The actual configuration files used during the build are stored in
 672# include/generated/ and include/config/. Update them if .config is newer than
 673# include/config/auto.conf (which mirrors .config).
 674#
 675# This exploits the 'multi-target pattern rule' trick.
 676# The syncconfig should be executed only once to make all the targets.
 677%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 678        $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 679else
 680# External modules and some install targets need include/generated/autoconf.h
 681# and include/config/auto.conf but do not care if they are up-to-date.
 682# Use auto.conf to trigger the test
 683PHONY += include/config/auto.conf
 684
 685include/config/auto.conf:
 686        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 687        echo >&2;                                                       \
 688        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 689        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 690        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 691        echo >&2 ;                                                      \
 692        /bin/false)
 693
 694endif # may-sync-config
 695endif # $(dot-config)
 696
 697KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 698KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 699KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 700KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 701KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 702
 703ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 704KBUILD_CFLAGS   += -Os
 705else
 706KBUILD_CFLAGS   += -O2
 707endif
 708
 709ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 710KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 711endif
 712
 713# Tell gcc to never replace conditional load with a non-conditional one
 714KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 715
 716include scripts/Makefile.kcov
 717include scripts/Makefile.gcc-plugins
 718
 719ifdef CONFIG_READABLE_ASM
 720# Disable optimizations that make assembler listings hard to read.
 721# reorder blocks reorders the control in the function
 722# ipa clone creates specialized cloned functions
 723# partial inlining inlines only parts of functions
 724KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 725                 $(call cc-option,-fno-ipa-cp-clone,) \
 726                 $(call cc-option,-fno-partial-inlining)
 727endif
 728
 729ifneq ($(CONFIG_FRAME_WARN),0)
 730KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 731endif
 732
 733stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 734stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 735stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 736
 737KBUILD_CFLAGS += $(stackp-flags-y)
 738
 739ifdef CONFIG_CC_IS_CLANG
 740KBUILD_CPPFLAGS += -Qunused-arguments
 741KBUILD_CFLAGS += -Wno-format-invalid-specifier
 742KBUILD_CFLAGS += -Wno-gnu
 743# Quiet clang warning: comparison of unsigned expression < 0 is always false
 744KBUILD_CFLAGS += -Wno-tautological-compare
 745# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 746# source of a reference will be _MergedGlobals and not on of the whitelisted names.
 747# See modpost pattern 2
 748KBUILD_CFLAGS += -mno-global-merge
 749else
 750
 751# These warnings generated too much noise in a regular build.
 752# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 753KBUILD_CFLAGS += -Wno-unused-but-set-variable
 754endif
 755
 756KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 757ifdef CONFIG_FRAME_POINTER
 758KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 759else
 760# Some targets (ARM with Thumb2, for example), can't be built with frame
 761# pointers.  For those, we don't have FUNCTION_TRACER automatically
 762# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 763# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 764# -fomit-frame-pointer with FUNCTION_TRACER.
 765ifndef CONFIG_FUNCTION_TRACER
 766KBUILD_CFLAGS   += -fomit-frame-pointer
 767endif
 768endif
 769
 770# Initialize all stack variables with a pattern, if desired.
 771ifdef CONFIG_INIT_STACK_ALL
 772KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 773endif
 774
 775DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 776
 777ifdef CONFIG_DEBUG_INFO
 778ifdef CONFIG_DEBUG_INFO_SPLIT
 779DEBUG_CFLAGS    += -gsplit-dwarf
 780else
 781DEBUG_CFLAGS    += -g
 782endif
 783KBUILD_AFLAGS   += -Wa,-gdwarf-2
 784endif
 785ifdef CONFIG_DEBUG_INFO_DWARF4
 786DEBUG_CFLAGS    += -gdwarf-4
 787endif
 788
 789ifdef CONFIG_DEBUG_INFO_REDUCED
 790DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 791                   $(call cc-option,-fno-var-tracking)
 792endif
 793
 794KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 795export DEBUG_CFLAGS
 796
 797ifdef CONFIG_FUNCTION_TRACER
 798ifdef CONFIG_FTRACE_MCOUNT_RECORD
 799  # gcc 5 supports generating the mcount tables directly
 800  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 801    CC_FLAGS_FTRACE     += -mrecord-mcount
 802    export CC_USING_RECORD_MCOUNT := 1
 803  endif
 804  ifdef CONFIG_HAVE_NOP_MCOUNT
 805    ifeq ($(call cc-option-yn, -mnop-mcount),y)
 806      CC_FLAGS_FTRACE   += -mnop-mcount
 807      CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 808    endif
 809  endif
 810endif
 811ifdef CONFIG_HAVE_FENTRY
 812  ifeq ($(call cc-option-yn, -mfentry),y)
 813    CC_FLAGS_FTRACE     += -mfentry
 814    CC_FLAGS_USING      += -DCC_USING_FENTRY
 815  endif
 816endif
 817export CC_FLAGS_FTRACE
 818KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 819KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 820ifdef CONFIG_DYNAMIC_FTRACE
 821        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 822                BUILD_C_RECORDMCOUNT := y
 823                export BUILD_C_RECORDMCOUNT
 824        endif
 825endif
 826endif
 827
 828# We trigger additional mismatches with less inlining
 829ifdef CONFIG_DEBUG_SECTION_MISMATCH
 830KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 831endif
 832
 833ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 834KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 835LDFLAGS_vmlinux += --gc-sections
 836endif
 837
 838ifdef CONFIG_LIVEPATCH
 839KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 840endif
 841
 842# arch Makefile may override CC so keep this after arch Makefile is included
 843NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 844
 845# warn about C99 declaration after statement
 846KBUILD_CFLAGS += -Wdeclaration-after-statement
 847
 848# Warn about unmarked fall-throughs in switch statement.
 849KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 850
 851# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 852KBUILD_CFLAGS += -Wvla
 853
 854# disable pointer signed / unsigned warnings in gcc 4.0
 855KBUILD_CFLAGS += -Wno-pointer-sign
 856
 857# disable stringop warnings in gcc 8+
 858KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 859
 860# disable invalid "can't wrap" optimizations for signed / pointers
 861KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 862
 863# clang sets -fmerge-all-constants by default as optimization, but this
 864# is non-conforming behavior for C and in fact breaks the kernel, so we
 865# need to disable it here generally.
 866KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 867
 868# for gcc -fno-merge-all-constants disables everything, but it is fine
 869# to have actual conforming behavior enabled.
 870KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 871
 872# Make sure -fstack-check isn't enabled (like gentoo apparently did)
 873KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 874
 875# conserve stack if available
 876KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 877
 878# Prohibit date/time macros, which would make the build non-deterministic
 879KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 880
 881# enforce correct pointer usage
 882KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 883
 884# Require designated initializers for all marked structures
 885KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 886
 887# change __FILE__ to the relative path from the srctree
 888KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 889
 890# ensure -fcf-protection is disabled when using retpoline as it is
 891# incompatible with -mindirect-branch=thunk-extern
 892ifdef CONFIG_RETPOLINE
 893KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 894endif
 895
 896# use the deterministic mode of AR if available
 897KBUILD_ARFLAGS := $(call ar-option,D)
 898
 899include scripts/Makefile.kasan
 900include scripts/Makefile.extrawarn
 901include scripts/Makefile.ubsan
 902
 903# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 904# last assignments
 905KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 906KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 907KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 908
 909KBUILD_LDFLAGS_MODULE += --build-id
 910LDFLAGS_vmlinux += --build-id
 911
 912ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 913LDFLAGS_vmlinux += $(call ld-option, -X,)
 914endif
 915
 916# insure the checker run with the right endianness
 917CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 918
 919# the checker needs the correct machine size
 920CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 921
 922# Default kernel image to build when no specific target is given.
 923# KBUILD_IMAGE may be overruled on the command line or
 924# set in the environment
 925# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 926# this default value
 927export KBUILD_IMAGE ?= vmlinux
 928
 929#
 930# INSTALL_PATH specifies where to place the updated kernel and system map
 931# images. Default is /boot, but you can set it to other values
 932export  INSTALL_PATH ?= /boot
 933
 934#
 935# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 936# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 937# an argument if needed. Otherwise it defaults to the kernel install path
 938#
 939export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 940
 941#
 942# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 943# relocations required by build roots.  This is not defined in the
 944# makefile but the argument can be passed to make if needed.
 945#
 946
 947MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 948export MODLIB
 949
 950#
 951# INSTALL_MOD_STRIP, if defined, will cause modules to be
 952# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 953# the default option --strip-debug will be used.  Otherwise,
 954# INSTALL_MOD_STRIP value will be used as the options to the strip command.
 955
 956ifdef INSTALL_MOD_STRIP
 957ifeq ($(INSTALL_MOD_STRIP),1)
 958mod_strip_cmd = $(STRIP) --strip-debug
 959else
 960mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 961endif # INSTALL_MOD_STRIP=1
 962else
 963mod_strip_cmd = true
 964endif # INSTALL_MOD_STRIP
 965export mod_strip_cmd
 966
 967# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 968# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 969# or CONFIG_MODULE_COMPRESS_XZ.
 970
 971mod_compress_cmd = true
 972ifdef CONFIG_MODULE_COMPRESS
 973  ifdef CONFIG_MODULE_COMPRESS_GZIP
 974    mod_compress_cmd = gzip -n -f
 975  endif # CONFIG_MODULE_COMPRESS_GZIP
 976  ifdef CONFIG_MODULE_COMPRESS_XZ
 977    mod_compress_cmd = xz -f
 978  endif # CONFIG_MODULE_COMPRESS_XZ
 979endif # CONFIG_MODULE_COMPRESS
 980export mod_compress_cmd
 981
 982ifdef CONFIG_MODULE_SIG_ALL
 983$(eval $(call config_filename,MODULE_SIG_KEY))
 984
 985mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 986else
 987mod_sign_cmd = true
 988endif
 989export mod_sign_cmd
 990
 991HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 992
 993ifdef CONFIG_STACK_VALIDATION
 994  has_libelf := $(call try-run,\
 995                echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 996  ifeq ($(has_libelf),1)
 997    objtool_target := tools/objtool FORCE
 998  else
 999    SKIP_STACK_VALIDATION := 1
1000    export SKIP_STACK_VALIDATION
1001  endif
1002endif
1003
1004PHONY += prepare0
1005
1006export MODORDER := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order
1007
1008ifeq ($(KBUILD_EXTMOD),)
1009core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1010
1011vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1012                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1013                     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1014
1015vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1016                     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1017                        $(drivers-) $(net-) $(libs-) $(virt-))))
1018
1019init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1020core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1021drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1022net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1023libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1024libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1025virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1026
1027# Externally visible symbols (used by link-vmlinux.sh)
1028export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1029                              $(drivers-y) $(net-y) $(virt-y)
1030export KBUILD_VMLINUX_LIBS := $(libs-y1)
1031export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1032export LDFLAGS_vmlinux
1033# used by scripts/package/Makefile
1034export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1035
1036vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1037
1038# Recurse until adjust_autoksyms.sh is satisfied
1039PHONY += autoksyms_recursive
1040ifdef CONFIG_TRIM_UNUSED_KSYMS
1041autoksyms_recursive: $(vmlinux-deps) modules.order
1042        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1043          "$(MAKE) -f $(srctree)/Makefile vmlinux"
1044endif
1045
1046# For the kernel to actually contain only the needed exported symbols,
1047# we have to build modules as well to determine what those symbols are.
1048# (this can be evaluated only once include/config/auto.conf has been included)
1049ifdef CONFIG_TRIM_UNUSED_KSYMS
1050  KBUILD_MODULES := 1
1051endif
1052
1053autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1054
1055$(autoksyms_h):
1056        $(Q)mkdir -p $(dir $@)
1057        $(Q)touch $@
1058
1059ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1060
1061# Final link of vmlinux with optional arch pass after final link
1062cmd_link-vmlinux =                                                 \
1063        $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1064        $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1065
1066vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1067        +$(call if_changed,link-vmlinux)
1068
1069targets := vmlinux
1070
1071# The actual objects are generated when descending,
1072# make sure no implicit rule kicks in
1073$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1074
1075# Handle descending into subdirectories listed in $(vmlinux-dirs)
1076# Preset locale variables to speed up the build process. Limit locale
1077# tweaks to this spot to avoid wrong language settings when running
1078# make menuconfig etc.
1079# Error messages still appears in the original language
1080
1081PHONY += $(vmlinux-dirs)
1082$(vmlinux-dirs): prepare
1083        $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1
1084
1085filechk_kernel.release = \
1086        echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1087
1088# Store (new) KERNELRELEASE string in include/config/kernel.release
1089include/config/kernel.release: FORCE
1090        $(call filechk,kernel.release)
1091
1092# Additional helpers built in scripts/
1093# Carefully list dependencies so we do not try to build scripts twice
1094# in parallel
1095PHONY += scripts
1096scripts: scripts_basic scripts_dtc
1097        $(Q)$(MAKE) $(build)=$(@)
1098
1099# Things we need to do before we recursively start building the kernel
1100# or the modules are listed in "prepare".
1101# A multi level approach is used. prepareN is processed before prepareN-1.
1102# archprepare is used in arch Makefiles and when processed asm symlink,
1103# version.h and scripts_basic is processed / created.
1104
1105PHONY += prepare archprepare prepare3
1106
1107# prepare3 is used to check if we are building in a separate output directory,
1108# and if so do:
1109# 1) Check that make has not been executed in the kernel src $(srctree)
1110prepare3: include/config/kernel.release
1111ifdef building_out_of_srctree
1112        @$(kecho) '  Using $(srctree) as source for kernel'
1113        $(Q)if [ -f $(srctree)/.config -o \
1114                 -d $(srctree)/include/config -o \
1115                 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1116                echo >&2 "  $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \
1117                echo >&2 "  in the '$(srctree)' directory.";\
1118                /bin/false; \
1119        fi;
1120endif
1121
1122archprepare: archheaders archscripts scripts prepare3 outputmakefile \
1123        asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1124
1125prepare0: archprepare
1126        $(Q)$(MAKE) $(build)=scripts/mod
1127        $(Q)$(MAKE) $(build)=.
1128
1129# All the preparing..
1130prepare: prepare0 prepare-objtool
1131
1132# Support for using generic headers in asm-generic
1133asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1134
1135PHONY += asm-generic uapi-asm-generic
1136asm-generic: uapi-asm-generic
1137        $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1138        generic=include/asm-generic
1139uapi-asm-generic:
1140        $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1141        generic=include/uapi/asm-generic
1142
1143PHONY += prepare-objtool
1144prepare-objtool: $(objtool_target)
1145ifeq ($(SKIP_STACK_VALIDATION),1)
1146ifdef CONFIG_UNWINDER_ORC
1147        @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1148        @false
1149else
1150        @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1151endif
1152endif
1153
1154# Generate some files
1155# ---------------------------------------------------------------------------
1156
1157# KERNELRELEASE can change from a few different places, meaning version.h
1158# needs to be updated, so this check is forced on all builds
1159
1160uts_len := 64
1161define filechk_utsrelease.h
1162        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1163          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1164          exit 1;                                                         \
1165        fi;                                                               \
1166        echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1167endef
1168
1169define filechk_version.h
1170        echo \#define LINUX_VERSION_CODE $(shell                         \
1171        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1172        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1173endef
1174
1175$(version_h): FORCE
1176        $(call filechk,version.h)
1177        $(Q)rm -f $(old_version_h)
1178
1179include/generated/utsrelease.h: include/config/kernel.release FORCE
1180        $(call filechk,utsrelease.h)
1181
1182PHONY += headerdep
1183headerdep:
1184        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1185        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1186
1187# ---------------------------------------------------------------------------
1188# Kernel headers
1189
1190#Default location for installed headers
1191export INSTALL_HDR_PATH = $(objtree)/usr
1192
1193quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1194      cmd_headers_install = \
1195        mkdir -p $(INSTALL_HDR_PATH); \
1196        rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1197        usr/include $(INSTALL_HDR_PATH)
1198
1199PHONY += headers_install
1200headers_install: headers
1201        $(call cmd,headers_install)
1202
1203PHONY += archheaders archscripts
1204
1205hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1206
1207PHONY += headers
1208headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1209        $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1210          $(error Headers not exportable for the $(SRCARCH) architecture))
1211        $(Q)$(MAKE) $(hdr-inst)=include/uapi
1212        $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1213
1214PHONY += headers_check
1215headers_check: headers
1216        $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1217        $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1218
1219ifdef CONFIG_HEADERS_INSTALL
1220prepare: headers
1221endif
1222
1223ifdef CONFIG_HEADERS_CHECK
1224all: headers_check
1225endif
1226
1227PHONY += scripts_unifdef
1228scripts_unifdef: scripts_basic
1229        $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1230
1231# ---------------------------------------------------------------------------
1232# Kernel selftest
1233
1234PHONY += kselftest
1235kselftest:
1236        $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1237
1238PHONY += kselftest-clean
1239kselftest-clean:
1240        $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1241
1242PHONY += kselftest-merge
1243kselftest-merge:
1244        $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1245        $(Q)find $(srctree)/tools/testing/selftests -name config | \
1246                xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1247        +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1248
1249# ---------------------------------------------------------------------------
1250# Devicetree files
1251
1252ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1253dtstree := arch/$(SRCARCH)/boot/dts
1254endif
1255
1256ifneq ($(dtstree),)
1257
1258%.dtb: prepare3 scripts_dtc
1259        $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1260
1261PHONY += dtbs dtbs_install dt_binding_check
1262dtbs dtbs_check: prepare3 scripts_dtc
1263        $(Q)$(MAKE) $(build)=$(dtstree)
1264
1265dtbs_check: export CHECK_DTBS=1
1266dtbs_check: dt_binding_check
1267
1268dtbs_install:
1269        $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1270
1271ifdef CONFIG_OF_EARLY_FLATTREE
1272all: dtbs
1273endif
1274
1275endif
1276
1277PHONY += scripts_dtc
1278scripts_dtc: scripts_basic
1279        $(Q)$(MAKE) $(build)=scripts/dtc
1280
1281dt_binding_check: scripts_dtc
1282        $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1283
1284# ---------------------------------------------------------------------------
1285# Modules
1286
1287ifdef CONFIG_MODULES
1288
1289# By default, build modules as well
1290
1291all: modules
1292
1293# Build modules
1294#
1295# A module can be listed more than once in obj-m resulting in
1296# duplicate lines in modules.order files.  Those are removed
1297# using awk while concatenating to the final file.
1298
1299PHONY += modules
1300modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1301        @$(kecho) '  Building modules, stage 2.';
1302        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1303        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1304
1305modules.order: $(vmlinux-dirs)
1306        $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1307
1308modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs))
1309
1310modules.builtin: $(modbuiltin-dirs)
1311        $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1312
1313PHONY += $(modbuiltin-dirs)
1314# tristate.conf is not included from this Makefile. Add it as a prerequisite
1315# here to make it self-healing in case somebody accidentally removes it.
1316$(modbuiltin-dirs): include/config/tristate.conf
1317        $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1318
1319# Target to prepare building external modules
1320PHONY += modules_prepare
1321modules_prepare: prepare
1322
1323# Target to install modules
1324PHONY += modules_install
1325modules_install: _modinst_ _modinst_post
1326
1327PHONY += _modinst_
1328_modinst_:
1329        @rm -rf $(MODLIB)/kernel
1330        @rm -f $(MODLIB)/source
1331        @mkdir -p $(MODLIB)/kernel
1332        @ln -s $(abspath $(srctree)) $(MODLIB)/source
1333        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1334                rm -f $(MODLIB)/build ; \
1335                ln -s $(CURDIR) $(MODLIB)/build ; \
1336        fi
1337        @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1338        @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1339        @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1340        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1341
1342# This depmod is only for convenience to give the initial
1343# boot a modules.dep even before / is mounted read-write.  However the
1344# boot script depmod is the master version.
1345PHONY += _modinst_post
1346_modinst_post: _modinst_
1347        $(call cmd,depmod)
1348
1349ifeq ($(CONFIG_MODULE_SIG), y)
1350PHONY += modules_sign
1351modules_sign:
1352        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1353endif
1354
1355else # CONFIG_MODULES
1356
1357# Modules not configured
1358# ---------------------------------------------------------------------------
1359
1360PHONY += modules modules_install
1361modules modules_install:
1362        @echo >&2
1363        @echo >&2 "The present kernel configuration has modules disabled."
1364        @echo >&2 "Type 'make config' and enable loadable module support."
1365        @echo >&2 "Then build a kernel with module support enabled."
1366        @echo >&2
1367        @exit 1
1368
1369endif # CONFIG_MODULES
1370
1371###
1372# Cleaning is done on three levels.
1373# make clean     Delete most generated files
1374#                Leave enough to build external modules
1375# make mrproper  Delete the current configuration, and all generated files
1376# make distclean Remove editor backup files, patch leftover files and the like
1377
1378# Directories & files removed with 'make clean'
1379CLEAN_DIRS  += include/ksym
1380CLEAN_FILES += modules.builtin.modinfo
1381
1382# Directories & files removed with 'make mrproper'
1383MRPROPER_DIRS  += include/config include/generated          \
1384                  arch/$(SRCARCH)/include/generated .tmp_objdiff
1385MRPROPER_FILES += .config .config.old .version \
1386                  Module.symvers \
1387                  signing_key.pem signing_key.priv signing_key.x509     \
1388                  x509.genkey extra_certificates signing_key.x509.keyid \
1389                  signing_key.x509.signer vmlinux-gdb.py
1390
1391# Directories & files removed with 'make distclean'
1392DISTCLEAN_DIRS  +=
1393DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1394
1395# clean - Delete most, but leave enough to build external modules
1396#
1397clean: rm-dirs  := $(CLEAN_DIRS)
1398clean: rm-files := $(CLEAN_FILES)
1399clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs))
1400
1401PHONY += $(clean-dirs) clean archclean vmlinuxclean
1402$(clean-dirs):
1403        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1404
1405vmlinuxclean:
1406        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1407        $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1408
1409clean: archclean vmlinuxclean
1410
1411# mrproper - Delete all generated files, including .config
1412#
1413mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1414mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1415mrproper-dirs      := $(addprefix _mrproper_,scripts)
1416
1417PHONY += $(mrproper-dirs) mrproper
1418$(mrproper-dirs):
1419        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1420
1421mrproper: clean $(mrproper-dirs)
1422        $(call cmd,rmdirs)
1423        $(call cmd,rmfiles)
1424
1425# distclean
1426#
1427distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1428distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1429
1430PHONY += distclean
1431
1432distclean: mrproper
1433        $(call cmd,rmdirs)
1434        $(call cmd,rmfiles)
1435        @find $(srctree) $(RCS_FIND_IGNORE) \
1436                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1437                -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1438                -o -name 'core' \) \
1439                -type f -print | xargs rm -f
1440
1441
1442# Packaging of the kernel to various formats
1443# ---------------------------------------------------------------------------
1444package-dir     := scripts/package
1445
1446%src-pkg: FORCE
1447        $(Q)$(MAKE) $(build)=$(package-dir) $@
1448%pkg: include/config/kernel.release FORCE
1449        $(Q)$(MAKE) $(build)=$(package-dir) $@
1450
1451
1452# Brief documentation of the typical targets used
1453# ---------------------------------------------------------------------------
1454
1455boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1456boards := $(sort $(notdir $(boards)))
1457board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1458board-dirs := $(sort $(notdir $(board-dirs:/=)))
1459
1460PHONY += help
1461help:
1462        @echo  'Cleaning targets:'
1463        @echo  '  clean           - Remove most generated files but keep the config and'
1464        @echo  '                    enough build support to build external modules'
1465        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1466        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1467        @echo  ''
1468        @echo  'Configuration targets:'
1469        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1470        @echo  ''
1471        @echo  'Other generic targets:'
1472        @echo  '  all             - Build all targets marked with [*]'
1473        @echo  '* vmlinux         - Build the bare kernel'
1474        @echo  '* modules         - Build all modules'
1475        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1476        @echo  '  dir/            - Build all files in dir and below'
1477        @echo  '  dir/file.[ois]  - Build specified target only'
1478        @echo  '  dir/file.ll     - Build the LLVM assembly file'
1479        @echo  '                    (requires compiler support for LLVM assembly generation)'
1480        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1481        @echo  '                    (requires a recent binutils and recent build (System.map))'
1482        @echo  '  dir/file.ko     - Build module including final link'
1483        @echo  '  modules_prepare - Set up for building external modules'
1484        @echo  '  tags/TAGS       - Generate tags file for editors'
1485        @echo  '  cscope          - Generate cscope index'
1486        @echo  '  gtags           - Generate GNU GLOBAL index'
1487        @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1488        @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1489        @echo  '  image_name      - Output the image name (use with make -s)'
1490        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1491         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1492         echo  ''
1493        @echo  'Static analysers:'
1494        @echo  '  checkstack      - Generate a list of stack hogs'
1495        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1496        @echo  '  versioncheck    - Sanity check on version.h usage'
1497        @echo  '  includecheck    - Check for duplicate included header files'
1498        @echo  '  export_report   - List the usages of all exported symbols'
1499        @echo  '  headers_check   - Sanity check on exported headers'
1500        @echo  '  headerdep       - Detect inclusion cycles in headers'
1501        @echo  '  coccicheck      - Check with Coccinelle'
1502        @echo  ''
1503        @echo  'Kernel selftest:'
1504        @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1505        @echo  '                    Build, install, and boot kernel before'
1506        @echo  '                    running kselftest on it'
1507        @echo  '  kselftest-clean - Remove all generated kselftest files'
1508        @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1509        @echo  '                    .config.'
1510        @echo  ''
1511        @$(if $(dtstree), \
1512                echo 'Devicetree:'; \
1513                echo '* dtbs            - Build device tree blobs for enabled boards'; \
1514                echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1515                echo '')
1516
1517        @echo 'Userspace tools targets:'
1518        @echo '  use "make tools/help"'
1519        @echo '  or  "cd tools; make help"'
1520        @echo  ''
1521        @echo  'Kernel packaging:'
1522        @$(MAKE) $(build)=$(package-dir) help
1523        @echo  ''
1524        @echo  'Documentation targets:'
1525        @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1526        @echo  ''
1527        @echo  'Architecture specific targets ($(SRCARCH)):'
1528        @$(if $(archhelp),$(archhelp),\
1529                echo '  No architecture specific help defined for $(SRCARCH)')
1530        @echo  ''
1531        @$(if $(boards), \
1532                $(foreach b, $(boards), \
1533                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1534                echo '')
1535        @$(if $(board-dirs), \
1536                $(foreach b, $(board-dirs), \
1537                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1538                printf "  %-16s - Show all of the above\\n" help-boards; \
1539                echo '')
1540
1541        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1542        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1543        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1544        @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1545        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1546        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1547        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1548        @echo  '                1: warnings which may be relevant and do not occur too often'
1549        @echo  '                2: warnings which occur quite often but may still be relevant'
1550        @echo  '                3: more obscure warnings, can most likely be ignored'
1551        @echo  '                Multiple levels can be combined with W=12 or W=123'
1552        @echo  ''
1553        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1554        @echo  'For further info see the ./README file'
1555
1556
1557help-board-dirs := $(addprefix help-,$(board-dirs))
1558
1559help-boards: $(help-board-dirs)
1560
1561boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1562
1563$(help-board-dirs): help-%:
1564        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1565        @$(if $(boards-per-dir), \
1566                $(foreach b, $(boards-per-dir), \
1567                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1568                echo '')
1569
1570
1571# Documentation targets
1572# ---------------------------------------------------------------------------
1573DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1574               linkcheckdocs dochelp refcheckdocs
1575PHONY += $(DOC_TARGETS)
1576$(DOC_TARGETS): scripts_basic FORCE
1577        $(Q)$(MAKE) $(build)=Documentation $@
1578
1579# Misc
1580# ---------------------------------------------------------------------------
1581
1582PHONY += scripts_gdb
1583scripts_gdb: prepare0
1584        $(Q)$(MAKE) $(build)=scripts/gdb
1585        $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1586
1587ifdef CONFIG_GDB_SCRIPTS
1588all: scripts_gdb
1589endif
1590
1591else # KBUILD_EXTMOD
1592
1593###
1594# External module support.
1595# When building external modules the kernel used as basis is considered
1596# read-only, and no consistency checks are made and the make
1597# system is not used on the basis kernel. If updates are required
1598# in the basis kernel ordinary make commands (without M=...) must
1599# be used.
1600#
1601# The following are the only valid targets when building external
1602# modules.
1603# make M=dir clean     Delete all automatically generated files
1604# make M=dir modules   Make all modules in specified dir
1605# make M=dir           Same as 'make M=dir modules'
1606# make M=dir modules_install
1607#                      Install the modules built in the module directory
1608#                      Assumes install directory is already created
1609
1610# We are always building modules
1611KBUILD_MODULES := 1
1612
1613PHONY += $(objtree)/Module.symvers
1614$(objtree)/Module.symvers:
1615        @test -e $(objtree)/Module.symvers || ( \
1616        echo; \
1617        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1618        echo "           is missing; modules will have no dependencies and modversions."; \
1619        echo )
1620
1621module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1622PHONY += $(module-dirs) modules
1623$(module-dirs): prepare $(objtree)/Module.symvers
1624        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) need-modorder=1
1625
1626modules: $(module-dirs)
1627        @$(kecho) '  Building modules, stage 2.';
1628        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1629
1630PHONY += modules_install
1631modules_install: _emodinst_ _emodinst_post
1632
1633install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1634PHONY += _emodinst_
1635_emodinst_:
1636        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1637        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1638
1639PHONY += _emodinst_post
1640_emodinst_post: _emodinst_
1641        $(call cmd,depmod)
1642
1643clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1644
1645PHONY += $(clean-dirs) clean
1646$(clean-dirs):
1647        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1648
1649clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1650
1651PHONY += help
1652help:
1653        @echo  '  Building external modules.'
1654        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1655        @echo  ''
1656        @echo  '  modules         - default target, build the module(s)'
1657        @echo  '  modules_install - install the module'
1658        @echo  '  clean           - remove generated files in module directory only'
1659        @echo  ''
1660
1661PHONY += prepare
1662endif # KBUILD_EXTMOD
1663
1664clean: $(clean-dirs)
1665        $(call cmd,rmdirs)
1666        $(call cmd,rmfiles)
1667        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1668                \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1669                -o -name '*.ko.*' \
1670                -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1671                -o -name '*.dwo' -o -name '*.lst' \
1672                -o -name '*.su' -o -name '*.mod' \
1673                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1674                -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1675                -o -name '*.asn1.[ch]' \
1676                -o -name '*.symtypes' -o -name 'modules.order' \
1677                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1678                -o -name '*.c.[012]*.*' \
1679                -o -name '*.ll' \
1680                -o -name '*.gcno' \) -type f -print | xargs rm -f
1681
1682# Generate tags for editors
1683# ---------------------------------------------------------------------------
1684quiet_cmd_tags = GEN     $@
1685      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1686
1687tags TAGS cscope gtags: FORCE
1688        $(call cmd,tags)
1689
1690# Scripts to check various things for consistency
1691# ---------------------------------------------------------------------------
1692
1693PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1694
1695includecheck:
1696        find $(srctree)/* $(RCS_FIND_IGNORE) \
1697                -name '*.[hcS]' -type f -print | sort \
1698                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1699
1700versioncheck:
1701        find $(srctree)/* $(RCS_FIND_IGNORE) \
1702                -name '*.[hcS]' -type f -print | sort \
1703                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1704
1705coccicheck:
1706        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1707
1708namespacecheck:
1709        $(PERL) $(srctree)/scripts/namespace.pl
1710
1711export_report:
1712        $(PERL) $(srctree)/scripts/export_report.pl
1713
1714PHONY += checkstack kernelrelease kernelversion image_name
1715
1716# UML needs a little special treatment here.  It wants to use the host
1717# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1718# else wants $(ARCH), including people doing cross-builds, which means
1719# that $(SUBARCH) doesn't work here.
1720ifeq ($(ARCH), um)
1721CHECKSTACK_ARCH := $(SUBARCH)
1722else
1723CHECKSTACK_ARCH := $(ARCH)
1724endif
1725checkstack:
1726        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1727        $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1728
1729kernelrelease:
1730        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1731
1732kernelversion:
1733        @echo $(KERNELVERSION)
1734
1735image_name:
1736        @echo $(KBUILD_IMAGE)
1737
1738# Clear a bunch of variables before executing the submake
1739
1740ifeq ($(quiet),silent_)
1741tools_silent=s
1742endif
1743
1744tools/: FORCE
1745        $(Q)mkdir -p $(objtree)/tools
1746        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1747
1748tools/%: FORCE
1749        $(Q)mkdir -p $(objtree)/tools
1750        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1751
1752# Single targets
1753# ---------------------------------------------------------------------------
1754# Single targets are compatible with:
1755# - build with mixed source and output
1756# - build with separate output dir 'make O=...'
1757# - external modules
1758#
1759#  target-dir => where to store outputfile
1760#  build-dir  => directory in kernel source tree to use
1761
1762build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1763build-dir = $(patsubst %/,%,$(dir $(build-target)))
1764
1765%.i: prepare FORCE
1766        $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1767%.ll: prepare FORCE
1768        $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1769%.lst: prepare FORCE
1770        $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1771%.o: prepare FORCE
1772        $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1773%.s: prepare FORCE
1774        $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1775%.symtypes: prepare FORCE
1776        $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1777ifeq ($(KBUILD_EXTMOD),)
1778# For the single build of an in-tree module, use a temporary file to avoid
1779# the situation of modules_install installing an invalid modules.order.
1780%.ko: MODORDER := .modules.tmp
1781endif
1782%.ko: prepare FORCE
1783        $(Q)$(MAKE) $(build)=$(build-dir) $(build-target:.ko=.mod)
1784        $(Q)echo $(build-target) > $(MODORDER)
1785        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1786
1787# Modules
1788PHONY += /
1789/: ./
1790
1791%/: prepare FORCE
1792        $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) need-modorder=1
1793
1794# FIXME Should go into a make.lib or something
1795# ===========================================================================
1796
1797quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1798      cmd_rmdirs = rm -rf $(rm-dirs)
1799
1800quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1801      cmd_rmfiles = rm -f $(rm-files)
1802
1803# Run depmod only if we have System.map and depmod is executable
1804quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1805      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1806                   $(KERNELRELEASE)
1807
1808# read saved command lines for existing targets
1809existing-targets := $(wildcard $(sort $(targets)))
1810
1811-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1812
1813endif   # ifeq ($(config-targets),1)
1814endif   # ifeq ($(mixed-targets),1)
1815endif   # need-sub-make
1816
1817PHONY += FORCE
1818FORCE:
1819
1820# Declare the contents of the PHONY variable as phony.  We keep that
1821# information in a variable so we can use it in if_changed and friends.
1822.PHONY: $(PHONY)
1823