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   1# SPDX-License-Identifier: GPL-2.0
   2VERSION = 4
   3PATCHLEVEL = 20
   4SUBLEVEL = 0
   5EXTRAVERSION =
   6NAME = Shy Crocodile
   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# Do not use make's built-in rules and variables
  19# (this increases performance and avoids hard-to-debug behaviour)
  20MAKEFLAGS += -rR
  21
  22# Avoid funny character set dependencies
  23unexport LC_ALL
  24LC_COLLATE=C
  25LC_NUMERIC=C
  26export LC_COLLATE LC_NUMERIC
  27
  28# Avoid interference with shell env settings
  29unexport GREP_OPTIONS
  30
  31# We are using a recursive build, so we need to do a little thinking
  32# to get the ordering right.
  33#
  34# Most importantly: sub-Makefiles should only ever modify files in
  35# their own directory. If in some directory we have a dependency on
  36# a file in another dir (which doesn't happen often, but it's often
  37# unavoidable when linking the built-in.a targets which finally
  38# turn into vmlinux), we will call a sub make in that other dir, and
  39# after that we are sure that everything which is in that other dir
  40# is now up to date.
  41#
  42# The only cases where we need to modify files which have global
  43# effects are thus separated out and done before the recursive
  44# descending is started. They are now explicitly listed as the
  45# prepare rule.
  46
  47# Beautify output
  48# ---------------------------------------------------------------------------
  49#
  50# Normally, we echo the whole command before executing it. By making
  51# that echo $($(quiet)$(cmd)), we now have the possibility to set
  52# $(quiet) to choose other forms of output instead, e.g.
  53#
  54#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  55#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  56#
  57# If $(quiet) is empty, the whole command will be printed.
  58# If it is set to "quiet_", only the short version will be printed.
  59# If it is set to "silent_", nothing will be printed at all, since
  60# the variable $(silent_cmd_cc_o_c) doesn't exist.
  61#
  62# A simple variant is to prefix commands with $(Q) - that's useful
  63# for commands that shall be hidden in non-verbose mode.
  64#
  65#       $(Q)ln $@ :<
  66#
  67# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  68# If KBUILD_VERBOSE equals 1 then the above command is displayed.
  69#
  70# To put more focus on warnings, be less verbose as default
  71# Use 'make V=1' to see the full commands
  72
  73ifeq ("$(origin V)", "command line")
  74  KBUILD_VERBOSE = $(V)
  75endif
  76ifndef KBUILD_VERBOSE
  77  KBUILD_VERBOSE = 0
  78endif
  79
  80ifeq ($(KBUILD_VERBOSE),1)
  81  quiet =
  82  Q =
  83else
  84  quiet=quiet_
  85  Q = @
  86endif
  87
  88# If the user is running make -s (silent mode), suppress echoing of
  89# commands
  90
  91ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  92  quiet=silent_
  93  tools_silent=s
  94endif
  95
  96export quiet Q KBUILD_VERBOSE
  97
  98# kbuild supports saving output files in a separate directory.
  99# To locate output files in a separate directory two syntaxes are supported.
 100# In both cases the working directory must be the root of the kernel src.
 101# 1) O=
 102# Use "make O=dir/to/store/output/files/"
 103#
 104# 2) Set KBUILD_OUTPUT
 105# Set the environment variable KBUILD_OUTPUT to point to the directory
 106# where the output files shall be placed.
 107# export KBUILD_OUTPUT=dir/to/store/output/files/
 108# make
 109#
 110# The O= assignment takes precedence over the KBUILD_OUTPUT environment
 111# variable.
 112
 113# KBUILD_SRC is not intended to be used by the regular user (for now),
 114# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 115ifeq ($(KBUILD_SRC),)
 116
 117# OK, Make called in directory where kernel src resides
 118# Do we want to locate output files in a separate directory?
 119ifeq ("$(origin O)", "command line")
 120  KBUILD_OUTPUT := $(O)
 121endif
 122
 123# Cancel implicit rules on top Makefile
 124$(CURDIR)/Makefile Makefile: ;
 125
 126ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 127  $(error main directory cannot contain spaces nor colons)
 128endif
 129
 130ifneq ($(KBUILD_OUTPUT),)
 131# check that the output directory actually exists
 132saved-output := $(KBUILD_OUTPUT)
 133KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 134                                                                && pwd)
 135$(if $(KBUILD_OUTPUT),, \
 136     $(error failed to create output directory "$(saved-output)"))
 137
 138# Look for make include files relative to root of kernel src
 139#
 140# This does not become effective immediately because MAKEFLAGS is re-parsed
 141# once after the Makefile is read.  It is OK since we are going to invoke
 142# 'sub-make' below.
 143MAKEFLAGS += --include-dir=$(CURDIR)
 144
 145PHONY += $(MAKECMDGOALS) sub-make
 146
 147$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 148        @:
 149
 150# Invoke a second make in the output directory, passing relevant variables
 151sub-make:
 152        $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 153        -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 154
 155# Leave processing to above invocation of make
 156skip-makefile := 1
 157endif # ifneq ($(KBUILD_OUTPUT),)
 158endif # ifeq ($(KBUILD_SRC),)
 159
 160# We process the rest of the Makefile if this is the final invocation of make
 161ifeq ($(skip-makefile),)
 162
 163# Do not print "Entering directory ...",
 164# but we want to display it when entering to the output directory
 165# so that IDEs/editors are able to understand relative filenames.
 166MAKEFLAGS += --no-print-directory
 167
 168# Call a source code checker (by default, "sparse") as part of the
 169# C compilation.
 170#
 171# Use 'make C=1' to enable checking of only re-compiled files.
 172# Use 'make C=2' to enable checking of *all* source files, regardless
 173# of whether they are re-compiled or not.
 174#
 175# See the file "Documentation/dev-tools/sparse.rst" for more details,
 176# including where to get the "sparse" utility.
 177
 178ifeq ("$(origin C)", "command line")
 179  KBUILD_CHECKSRC = $(C)
 180endif
 181ifndef KBUILD_CHECKSRC
 182  KBUILD_CHECKSRC = 0
 183endif
 184
 185# Use make M=dir to specify directory of external module to build
 186# Old syntax make ... SUBDIRS=$PWD is still supported
 187# Setting the environment variable KBUILD_EXTMOD take precedence
 188ifdef SUBDIRS
 189  KBUILD_EXTMOD ?= $(SUBDIRS)
 190endif
 191
 192ifeq ("$(origin M)", "command line")
 193  KBUILD_EXTMOD := $(M)
 194endif
 195
 196ifeq ($(KBUILD_SRC),)
 197        # building in the source tree
 198        srctree := .
 199else
 200        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 201                # building in a subdirectory of the source tree
 202                srctree := ..
 203        else
 204                srctree := $(KBUILD_SRC)
 205        endif
 206endif
 207
 208export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 209
 210objtree         := .
 211src             := $(srctree)
 212obj             := $(objtree)
 213
 214VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 215
 216export srctree objtree VPATH
 217
 218# To make sure we do not include .config for any of the *config targets
 219# catch them early, and hand them over to scripts/kconfig/Makefile
 220# It is allowed to specify more targets when calling make, including
 221# mixing *config targets and build targets.
 222# For example 'make oldconfig all'.
 223# Detect when mixed targets is specified, and make a second invocation
 224# of make so .config is not included in this case either (for *config).
 225
 226version_h := include/generated/uapi/linux/version.h
 227old_version_h := include/linux/version.h
 228
 229clean-targets := %clean mrproper cleandocs
 230no-dot-config-targets := $(clean-targets) \
 231                         cscope gtags TAGS tags help% %docs check% coccicheck \
 232                         $(version_h) headers_% archheaders archscripts \
 233                         %asm-generic kernelversion %src-pkg
 234no-sync-config-targets := $(no-dot-config-targets) install %install \
 235                           kernelrelease
 236
 237config-targets  := 0
 238mixed-targets   := 0
 239dot-config      := 1
 240may-sync-config := 1
 241
 242ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 243        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 244                dot-config := 0
 245        endif
 246endif
 247
 248ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 249        ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 250                may-sync-config := 0
 251        endif
 252endif
 253
 254ifneq ($(KBUILD_EXTMOD),)
 255        may-sync-config := 0
 256endif
 257
 258ifeq ($(KBUILD_EXTMOD),)
 259        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 260                config-targets := 1
 261                ifneq ($(words $(MAKECMDGOALS)),1)
 262                        mixed-targets := 1
 263                endif
 264        endif
 265endif
 266
 267# For "make -j clean all", "make -j mrproper defconfig all", etc.
 268ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 269        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 270                mixed-targets := 1
 271        endif
 272endif
 273
 274# install and modules_install need also be processed one by one
 275ifneq ($(filter install,$(MAKECMDGOALS)),)
 276        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 277                mixed-targets := 1
 278        endif
 279endif
 280
 281ifeq ($(mixed-targets),1)
 282# ===========================================================================
 283# We're called with mixed targets (*config and build targets).
 284# Handle them one by one.
 285
 286PHONY += $(MAKECMDGOALS) __build_one_by_one
 287
 288$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 289        @:
 290
 291__build_one_by_one:
 292        $(Q)set -e; \
 293        for i in $(MAKECMDGOALS); do \
 294                $(MAKE) -f $(srctree)/Makefile $$i; \
 295        done
 296
 297else
 298
 299# We need some generic definitions (do not try to remake the file).
 300scripts/Kbuild.include: ;
 301include scripts/Kbuild.include
 302
 303# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 304KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 305KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 306export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 307
 308include scripts/subarch.include
 309
 310# Cross compiling and selecting different set of gcc/bin-utils
 311# ---------------------------------------------------------------------------
 312#
 313# When performing cross compilation for other architectures ARCH shall be set
 314# to the target architecture. (See arch/* for the possibilities).
 315# ARCH can be set during invocation of make:
 316# make ARCH=ia64
 317# Another way is to have ARCH set in the environment.
 318# The default ARCH is the host where make is executed.
 319
 320# CROSS_COMPILE specify the prefix used for all executables used
 321# during compilation. Only gcc and related bin-utils executables
 322# are prefixed with $(CROSS_COMPILE).
 323# CROSS_COMPILE can be set on the command line
 324# make CROSS_COMPILE=ia64-linux-
 325# Alternatively CROSS_COMPILE can be set in the environment.
 326# Default value for CROSS_COMPILE is not to prefix executables
 327# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 328ARCH            ?= $(SUBARCH)
 329
 330# Architecture as present in compile.h
 331UTS_MACHINE     := $(ARCH)
 332SRCARCH         := $(ARCH)
 333
 334# Additional ARCH settings for x86
 335ifeq ($(ARCH),i386)
 336        SRCARCH := x86
 337endif
 338ifeq ($(ARCH),x86_64)
 339        SRCARCH := x86
 340endif
 341
 342# Additional ARCH settings for sparc
 343ifeq ($(ARCH),sparc32)
 344       SRCARCH := sparc
 345endif
 346ifeq ($(ARCH),sparc64)
 347       SRCARCH := sparc
 348endif
 349
 350# Additional ARCH settings for sh
 351ifeq ($(ARCH),sh64)
 352       SRCARCH := sh
 353endif
 354
 355KCONFIG_CONFIG  ?= .config
 356export KCONFIG_CONFIG
 357
 358# SHELL used by kbuild
 359CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 360          else if [ -x /bin/bash ]; then echo /bin/bash; \
 361          else echo sh; fi ; fi)
 362
 363HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 364HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 365HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 366
 367HOSTCC       = gcc
 368HOSTCXX      = g++
 369KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 370                -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 371                $(HOSTCFLAGS)
 372KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 373KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 374KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 375
 376# Make variables (CC, etc...)
 377AS              = $(CROSS_COMPILE)as
 378LD              = $(CROSS_COMPILE)ld
 379CC              = $(CROSS_COMPILE)gcc
 380CPP             = $(CC) -E
 381AR              = $(CROSS_COMPILE)ar
 382NM              = $(CROSS_COMPILE)nm
 383STRIP           = $(CROSS_COMPILE)strip
 384OBJCOPY         = $(CROSS_COMPILE)objcopy
 385OBJDUMP         = $(CROSS_COMPILE)objdump
 386LEX             = flex
 387YACC            = bison
 388AWK             = awk
 389GENKSYMS        = scripts/genksyms/genksyms
 390INSTALLKERNEL  := installkernel
 391DEPMOD          = /sbin/depmod
 392PERL            = perl
 393PYTHON          = python
 394PYTHON2         = python2
 395PYTHON3         = python3
 396CHECK           = sparse
 397
 398CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 399                  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 400NOSTDINC_FLAGS  =
 401CFLAGS_MODULE   =
 402AFLAGS_MODULE   =
 403LDFLAGS_MODULE  =
 404CFLAGS_KERNEL   =
 405AFLAGS_KERNEL   =
 406LDFLAGS_vmlinux =
 407
 408# Use USERINCLUDE when you must reference the UAPI directories only.
 409USERINCLUDE    := \
 410                -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 411                -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 412                -I$(srctree)/include/uapi \
 413                -I$(objtree)/include/generated/uapi \
 414                -include $(srctree)/include/linux/kconfig.h
 415
 416# Use LINUXINCLUDE when you must reference the include/ directory.
 417# Needed to be compatible with the O= option
 418LINUXINCLUDE    := \
 419                -I$(srctree)/arch/$(SRCARCH)/include \
 420                -I$(objtree)/arch/$(SRCARCH)/include/generated \
 421                $(if $(KBUILD_SRC), -I$(srctree)/include) \
 422                -I$(objtree)/include \
 423                $(USERINCLUDE)
 424
 425KBUILD_AFLAGS   := -D__ASSEMBLY__
 426KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 427                   -fno-strict-aliasing -fno-common -fshort-wchar \
 428                   -Werror-implicit-function-declaration \
 429                   -Wno-format-security \
 430                   -std=gnu89
 431KBUILD_CPPFLAGS := -D__KERNEL__
 432KBUILD_AFLAGS_KERNEL :=
 433KBUILD_CFLAGS_KERNEL :=
 434KBUILD_AFLAGS_MODULE  := -DMODULE
 435KBUILD_CFLAGS_MODULE  := -DMODULE
 436KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 437KBUILD_LDFLAGS :=
 438GCC_PLUGINS_CFLAGS :=
 439
 440export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 441export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 442export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 443export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 444
 445export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 446export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 447export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 448export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 449export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 450export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 451export KBUILD_ARFLAGS
 452
 453# When compiling out-of-tree modules, put MODVERDIR in the module
 454# tree rather than in the kernel tree. The kernel tree might
 455# even be read-only.
 456export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 457
 458# Files to ignore in find ... statements
 459
 460export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 461                          -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 462                          -prune -o
 463export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 464                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
 465
 466# ===========================================================================
 467# Rules shared between *config targets and build targets
 468
 469# Basic helpers built in scripts/basic/
 470PHONY += scripts_basic
 471scripts_basic:
 472        $(Q)$(MAKE) $(build)=scripts/basic
 473        $(Q)rm -f .tmp_quiet_recordmcount
 474
 475# To avoid any implicit rule to kick in, define an empty command.
 476scripts/basic/%: scripts_basic ;
 477
 478PHONY += outputmakefile
 479# outputmakefile generates a Makefile in the output directory, if using a
 480# separate output directory. This allows convenient use of make in the
 481# output directory.
 482outputmakefile:
 483ifneq ($(KBUILD_SRC),)
 484        $(Q)ln -fsn $(srctree) source
 485        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 486endif
 487
 488ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 489ifneq ($(CROSS_COMPILE),)
 490CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 491GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
 492CLANG_PREFIX    := --prefix=$(GCC_TOOLCHAIN_DIR)
 493GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 494endif
 495ifneq ($(GCC_TOOLCHAIN),)
 496CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 497endif
 498KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
 499KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
 500KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 501KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 502endif
 503
 504RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 505RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 506RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 507RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 508RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 509RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 510export RETPOLINE_CFLAGS
 511export RETPOLINE_VDSO_CFLAGS
 512
 513KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 514KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 515
 516# check for 'asm goto'
 517ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 518  CC_HAVE_ASM_GOTO := 1
 519  KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 520  KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 521endif
 522
 523# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 524# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 525# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 526# and from include/config/auto.conf.cmd to detect the compiler upgrade.
 527CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 528
 529ifeq ($(config-targets),1)
 530# ===========================================================================
 531# *config targets only - make sure prerequisites are updated, and descend
 532# in scripts/kconfig to make the *config target
 533
 534# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 535# KBUILD_DEFCONFIG may point out an alternative default configuration
 536# used for 'make defconfig'
 537include arch/$(SRCARCH)/Makefile
 538export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 539
 540config: scripts_basic outputmakefile FORCE
 541        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 542
 543%config: scripts_basic outputmakefile FORCE
 544        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 545
 546else
 547# ===========================================================================
 548# Build targets only - this includes vmlinux, arch specific targets, clean
 549# targets and others. In general all targets except *config targets.
 550
 551# If building an external module we do not care about the all: rule
 552# but instead _all depend on modules
 553PHONY += all
 554ifeq ($(KBUILD_EXTMOD),)
 555_all: all
 556else
 557_all: modules
 558endif
 559
 560# Decide whether to build built-in, modular, or both.
 561# Normally, just do built-in.
 562
 563KBUILD_MODULES :=
 564KBUILD_BUILTIN := 1
 565
 566# If we have only "make modules", don't compile built-in objects.
 567# When we're building modules with modversions, we need to consider
 568# the built-in objects during the descend as well, in order to
 569# make sure the checksums are up to date before we record them.
 570
 571ifeq ($(MAKECMDGOALS),modules)
 572  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 573endif
 574
 575# If we have "make <whatever> modules", compile modules
 576# in addition to whatever we do anyway.
 577# Just "make" or "make all" shall build modules as well
 578
 579ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 580  KBUILD_MODULES := 1
 581endif
 582
 583ifeq ($(MAKECMDGOALS),)
 584  KBUILD_MODULES := 1
 585endif
 586
 587export KBUILD_MODULES KBUILD_BUILTIN
 588
 589ifeq ($(KBUILD_EXTMOD),)
 590# Objects we will link into vmlinux / subdirs we need to visit
 591init-y          := init/
 592drivers-y       := drivers/ sound/ firmware/
 593net-y           := net/
 594libs-y          := lib/
 595core-y          := usr/
 596virt-y          := virt/
 597endif # KBUILD_EXTMOD
 598
 599ifeq ($(dot-config),1)
 600include include/config/auto.conf
 601endif
 602
 603# The all: target is the default when no target is given on the
 604# command line.
 605# This allow a user to issue only 'make' to build a kernel including modules
 606# Defaults to vmlinux, but the arch makefile usually adds further targets
 607all: vmlinux
 608
 609CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 610        $(call cc-option,-fno-tree-loop-im) \
 611        $(call cc-disable-warning,maybe-uninitialized,)
 612export CFLAGS_GCOV
 613
 614# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 615ifdef CONFIG_FUNCTION_TRACER
 616  CC_FLAGS_FTRACE := -pg
 617endif
 618
 619# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 620# values of the respective KBUILD_* variables
 621ARCH_CPPFLAGS :=
 622ARCH_AFLAGS :=
 623ARCH_CFLAGS :=
 624include arch/$(SRCARCH)/Makefile
 625
 626ifeq ($(dot-config),1)
 627ifeq ($(may-sync-config),1)
 628# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 629# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 630# because some architectures define CROSS_COMPILE there.
 631-include include/config/auto.conf.cmd
 632
 633# To avoid any implicit rule to kick in, define an empty command
 634$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 635
 636# The actual configuration files used during the build are stored in
 637# include/generated/ and include/config/. Update them if .config is newer than
 638# include/config/auto.conf (which mirrors .config).
 639include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 640        $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 641else
 642# External modules and some install targets need include/generated/autoconf.h
 643# and include/config/auto.conf but do not care if they are up-to-date.
 644# Use auto.conf to trigger the test
 645PHONY += include/config/auto.conf
 646
 647include/config/auto.conf:
 648        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 649        echo >&2;                                                       \
 650        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 651        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 652        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 653        echo >&2 ;                                                      \
 654        /bin/false)
 655
 656endif # may-sync-config
 657endif # $(dot-config)
 658
 659KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 660KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 661KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 662KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 663KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 664
 665ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 666KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 667KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 668else
 669ifdef CONFIG_PROFILE_ALL_BRANCHES
 670KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 671else
 672KBUILD_CFLAGS   += -O2
 673endif
 674endif
 675
 676KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 677                        $(call cc-disable-warning,maybe-uninitialized,))
 678
 679# Tell gcc to never replace conditional load with a non-conditional one
 680KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 681
 682include scripts/Makefile.kcov
 683include scripts/Makefile.gcc-plugins
 684
 685ifdef CONFIG_READABLE_ASM
 686# Disable optimizations that make assembler listings hard to read.
 687# reorder blocks reorders the control in the function
 688# ipa clone creates specialized cloned functions
 689# partial inlining inlines only parts of functions
 690KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 691                 $(call cc-option,-fno-ipa-cp-clone,) \
 692                 $(call cc-option,-fno-partial-inlining)
 693endif
 694
 695ifneq ($(CONFIG_FRAME_WARN),0)
 696KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 697endif
 698
 699stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 700stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 701stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 702
 703KBUILD_CFLAGS += $(stackp-flags-y)
 704
 705ifdef CONFIG_CC_IS_CLANG
 706KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 707KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 708KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 709KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 710# Quiet clang warning: comparison of unsigned expression < 0 is always false
 711KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 712# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 713# source of a reference will be _MergedGlobals and not on of the whitelisted names.
 714# See modpost pattern 2
 715KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 716KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 717else
 718
 719# These warnings generated too much noise in a regular build.
 720# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 721KBUILD_CFLAGS += -Wno-unused-but-set-variable
 722endif
 723
 724KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 725ifdef CONFIG_FRAME_POINTER
 726KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 727else
 728# Some targets (ARM with Thumb2, for example), can't be built with frame
 729# pointers.  For those, we don't have FUNCTION_TRACER automatically
 730# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 731# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 732# -fomit-frame-pointer with FUNCTION_TRACER.
 733ifndef CONFIG_FUNCTION_TRACER
 734KBUILD_CFLAGS   += -fomit-frame-pointer
 735endif
 736endif
 737
 738KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 739
 740ifdef CONFIG_DEBUG_INFO
 741ifdef CONFIG_DEBUG_INFO_SPLIT
 742KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 743else
 744KBUILD_CFLAGS   += -g
 745endif
 746KBUILD_AFLAGS   += -Wa,-gdwarf-2
 747endif
 748ifdef CONFIG_DEBUG_INFO_DWARF4
 749KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 750endif
 751
 752ifdef CONFIG_DEBUG_INFO_REDUCED
 753KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 754                   $(call cc-option,-fno-var-tracking)
 755endif
 756
 757ifdef CONFIG_FUNCTION_TRACER
 758ifdef CONFIG_FTRACE_MCOUNT_RECORD
 759  # gcc 5 supports generating the mcount tables directly
 760  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 761    CC_FLAGS_FTRACE     += -mrecord-mcount
 762    export CC_USING_RECORD_MCOUNT := 1
 763  endif
 764  ifdef CONFIG_HAVE_NOP_MCOUNT
 765    ifeq ($(call cc-option-yn, -mnop-mcount),y)
 766      CC_FLAGS_FTRACE   += -mnop-mcount
 767      CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 768    endif
 769  endif
 770endif
 771ifdef CONFIG_HAVE_FENTRY
 772  ifeq ($(call cc-option-yn, -mfentry),y)
 773    CC_FLAGS_FTRACE     += -mfentry
 774    CC_FLAGS_USING      += -DCC_USING_FENTRY
 775  endif
 776endif
 777export CC_FLAGS_FTRACE
 778KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 779KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 780ifdef CONFIG_DYNAMIC_FTRACE
 781        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 782                BUILD_C_RECORDMCOUNT := y
 783                export BUILD_C_RECORDMCOUNT
 784        endif
 785endif
 786endif
 787
 788# We trigger additional mismatches with less inlining
 789ifdef CONFIG_DEBUG_SECTION_MISMATCH
 790KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 791endif
 792
 793ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 794KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 795LDFLAGS_vmlinux += --gc-sections
 796endif
 797
 798# arch Makefile may override CC so keep this after arch Makefile is included
 799NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 800
 801# warn about C99 declaration after statement
 802KBUILD_CFLAGS += -Wdeclaration-after-statement
 803
 804# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 805KBUILD_CFLAGS += $(call cc-option,-Wvla)
 806
 807# disable pointer signed / unsigned warnings in gcc 4.0
 808KBUILD_CFLAGS += -Wno-pointer-sign
 809
 810# disable stringop warnings in gcc 8+
 811KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 812
 813# disable invalid "can't wrap" optimizations for signed / pointers
 814KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 815
 816# clang sets -fmerge-all-constants by default as optimization, but this
 817# is non-conforming behavior for C and in fact breaks the kernel, so we
 818# need to disable it here generally.
 819KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 820
 821# for gcc -fno-merge-all-constants disables everything, but it is fine
 822# to have actual conforming behavior enabled.
 823KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 824
 825# Make sure -fstack-check isn't enabled (like gentoo apparently did)
 826KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 827
 828# conserve stack if available
 829KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 830
 831# disallow errors like 'EXPORT_GPL(foo);' with missing header
 832KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 833
 834# require functions to have arguments in prototypes, not empty 'int foo()'
 835KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 836
 837# Prohibit date/time macros, which would make the build non-deterministic
 838KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 839
 840# enforce correct pointer usage
 841KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 842
 843# Require designated initializers for all marked structures
 844KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 845
 846# change __FILE__ to the relative path from the srctree
 847KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 848
 849# use the deterministic mode of AR if available
 850KBUILD_ARFLAGS := $(call ar-option,D)
 851
 852include scripts/Makefile.kasan
 853include scripts/Makefile.extrawarn
 854include scripts/Makefile.ubsan
 855
 856# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 857# last assignments
 858KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 859KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 860KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 861
 862# Use --build-id when available.
 863LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 864KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 865LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 866
 867ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 868LDFLAGS_vmlinux += $(call ld-option, -X,)
 869endif
 870
 871# insure the checker run with the right endianness
 872CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 873
 874# the checker needs the correct machine size
 875CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 876
 877# Default kernel image to build when no specific target is given.
 878# KBUILD_IMAGE may be overruled on the command line or
 879# set in the environment
 880# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 881# this default value
 882export KBUILD_IMAGE ?= vmlinux
 883
 884#
 885# INSTALL_PATH specifies where to place the updated kernel and system map
 886# images. Default is /boot, but you can set it to other values
 887export  INSTALL_PATH ?= /boot
 888
 889#
 890# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 891# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 892# an argument if needed. Otherwise it defaults to the kernel install path
 893#
 894export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 895
 896#
 897# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 898# relocations required by build roots.  This is not defined in the
 899# makefile but the argument can be passed to make if needed.
 900#
 901
 902MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 903export MODLIB
 904
 905#
 906# INSTALL_MOD_STRIP, if defined, will cause modules to be
 907# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 908# the default option --strip-debug will be used.  Otherwise,
 909# INSTALL_MOD_STRIP value will be used as the options to the strip command.
 910
 911ifdef INSTALL_MOD_STRIP
 912ifeq ($(INSTALL_MOD_STRIP),1)
 913mod_strip_cmd = $(STRIP) --strip-debug
 914else
 915mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 916endif # INSTALL_MOD_STRIP=1
 917else
 918mod_strip_cmd = true
 919endif # INSTALL_MOD_STRIP
 920export mod_strip_cmd
 921
 922# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 923# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 924# or CONFIG_MODULE_COMPRESS_XZ.
 925
 926mod_compress_cmd = true
 927ifdef CONFIG_MODULE_COMPRESS
 928  ifdef CONFIG_MODULE_COMPRESS_GZIP
 929    mod_compress_cmd = gzip -n -f
 930  endif # CONFIG_MODULE_COMPRESS_GZIP
 931  ifdef CONFIG_MODULE_COMPRESS_XZ
 932    mod_compress_cmd = xz -f
 933  endif # CONFIG_MODULE_COMPRESS_XZ
 934endif # CONFIG_MODULE_COMPRESS
 935export mod_compress_cmd
 936
 937# Select initial ramdisk compression format, default is gzip(1).
 938# This shall be used by the dracut(8) tool while creating an initramfs image.
 939#
 940INITRD_COMPRESS-y                  := gzip
 941INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 942INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 943INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 944INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 945INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 946# do not export INITRD_COMPRESS, since we didn't actually
 947# choose a sane default compression above.
 948# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 949
 950ifdef CONFIG_MODULE_SIG_ALL
 951$(eval $(call config_filename,MODULE_SIG_KEY))
 952
 953mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 954else
 955mod_sign_cmd = true
 956endif
 957export mod_sign_cmd
 958
 959ifdef CONFIG_STACK_VALIDATION
 960  has_libelf := $(call try-run,\
 961                echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 962  ifeq ($(has_libelf),1)
 963    objtool_target := tools/objtool FORCE
 964  else
 965    SKIP_STACK_VALIDATION := 1
 966    export SKIP_STACK_VALIDATION
 967  endif
 968endif
 969
 970
 971ifeq ($(KBUILD_EXTMOD),)
 972core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 973
 974vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 975                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 976                     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 977
 978vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 979                     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 980
 981init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 982core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 983drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 984net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 985libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 986libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 987virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 988
 989# Externally visible symbols (used by link-vmlinux.sh)
 990export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 991export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 992export KBUILD_VMLINUX_LIBS := $(libs-y1)
 993export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 994export LDFLAGS_vmlinux
 995# used by scripts/package/Makefile
 996export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 997
 998vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 999
1000# Recurse until adjust_autoksyms.sh is satisfied
1001PHONY += autoksyms_recursive
1002autoksyms_recursive: $(vmlinux-deps)
1003ifdef CONFIG_TRIM_UNUSED_KSYMS
1004        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1005          "$(MAKE) -f $(srctree)/Makefile vmlinux"
1006endif
1007
1008# For the kernel to actually contain only the needed exported symbols,
1009# we have to build modules as well to determine what those symbols are.
1010# (this can be evaluated only once include/config/auto.conf has been included)
1011ifdef CONFIG_TRIM_UNUSED_KSYMS
1012  KBUILD_MODULES := 1
1013endif
1014
1015autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1016
1017$(autoksyms_h):
1018        $(Q)mkdir -p $(dir $@)
1019        $(Q)touch $@
1020
1021ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1022
1023# Final link of vmlinux with optional arch pass after final link
1024cmd_link-vmlinux =                                                 \
1025        $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1026        $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1027
1028vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1029ifdef CONFIG_HEADERS_CHECK
1030        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1031endif
1032ifdef CONFIG_GDB_SCRIPTS
1033        $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1034endif
1035        +$(call if_changed,link-vmlinux)
1036
1037# Build samples along the rest of the kernel. This needs headers_install.
1038ifdef CONFIG_SAMPLES
1039vmlinux-dirs += samples
1040samples: headers_install
1041endif
1042
1043# The actual objects are generated when descending,
1044# make sure no implicit rule kicks in
1045$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1046
1047# Handle descending into subdirectories listed in $(vmlinux-dirs)
1048# Preset locale variables to speed up the build process. Limit locale
1049# tweaks to this spot to avoid wrong language settings when running
1050# make menuconfig etc.
1051# Error messages still appears in the original language
1052
1053PHONY += $(vmlinux-dirs)
1054$(vmlinux-dirs): prepare scripts
1055        $(Q)$(MAKE) $(build)=$@ need-builtin=1
1056
1057define filechk_kernel.release
1058        echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1059endef
1060
1061# Store (new) KERNELRELEASE string in include/config/kernel.release
1062include/config/kernel.release: $(srctree)/Makefile FORCE
1063        $(call filechk,kernel.release)
1064
1065# Additional helpers built in scripts/
1066# Carefully list dependencies so we do not try to build scripts twice
1067# in parallel
1068PHONY += scripts
1069scripts: scripts_basic scripts_dtc asm-generic gcc-plugins $(autoksyms_h)
1070        $(Q)$(MAKE) $(build)=$(@)
1071
1072# Things we need to do before we recursively start building the kernel
1073# or the modules are listed in "prepare".
1074# A multi level approach is used. prepareN is processed before prepareN-1.
1075# archprepare is used in arch Makefiles and when processed asm symlink,
1076# version.h and scripts_basic is processed / created.
1077
1078# Listed in dependency order
1079PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1080
1081# prepare3 is used to check if we are building in a separate output directory,
1082# and if so do:
1083# 1) Check that make has not been executed in the kernel src $(srctree)
1084prepare3: include/config/kernel.release
1085ifneq ($(KBUILD_SRC),)
1086        @$(kecho) '  Using $(srctree) as source for kernel'
1087        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1088                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1089                echo >&2 "  in the '$(srctree)' directory.";\
1090                /bin/false; \
1091        fi;
1092endif
1093
1094# prepare2 creates a makefile if using a separate output directory.
1095# From this point forward, .config has been reprocessed, so any rules
1096# that need to depend on updated CONFIG_* values can be checked here.
1097prepare2: prepare3 outputmakefile asm-generic
1098
1099prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1100        $(cmd_crmodverdir)
1101
1102archprepare: archheaders archscripts prepare1 scripts_basic
1103
1104prepare0: archprepare gcc-plugins
1105        $(Q)$(MAKE) $(build)=.
1106
1107# All the preparing..
1108prepare: prepare0 prepare-objtool
1109
1110# Support for using generic headers in asm-generic
1111PHONY += asm-generic uapi-asm-generic
1112asm-generic: uapi-asm-generic
1113        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1114                    src=asm obj=arch/$(SRCARCH)/include/generated/asm
1115uapi-asm-generic:
1116        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1117                    src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1118
1119PHONY += prepare-objtool
1120prepare-objtool: $(objtool_target)
1121ifeq ($(SKIP_STACK_VALIDATION),1)
1122ifdef CONFIG_UNWINDER_ORC
1123        @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1124        @false
1125else
1126        @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1127endif
1128endif
1129
1130# Generate some files
1131# ---------------------------------------------------------------------------
1132
1133# KERNELRELEASE can change from a few different places, meaning version.h
1134# needs to be updated, so this check is forced on all builds
1135
1136uts_len := 64
1137define filechk_utsrelease.h
1138        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1139          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1140          exit 1;                                                         \
1141        fi;                                                               \
1142        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1143endef
1144
1145define filechk_version.h
1146        (echo \#define LINUX_VERSION_CODE $(shell                         \
1147        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1148        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1149endef
1150
1151$(version_h): FORCE
1152        $(call filechk,version.h)
1153        $(Q)rm -f $(old_version_h)
1154
1155include/generated/utsrelease.h: include/config/kernel.release FORCE
1156        $(call filechk,utsrelease.h)
1157
1158PHONY += headerdep
1159headerdep:
1160        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1161        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1162
1163# ---------------------------------------------------------------------------
1164# Kernel headers
1165
1166#Default location for installed headers
1167export INSTALL_HDR_PATH = $(objtree)/usr
1168
1169# If we do an all arch process set dst to include/arch-$(SRCARCH)
1170hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1171
1172PHONY += archheaders
1173archheaders:
1174
1175PHONY += archscripts
1176archscripts:
1177
1178PHONY += __headers
1179__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1180        $(Q)$(MAKE) $(build)=scripts build_unifdef
1181
1182PHONY += headers_install_all
1183headers_install_all:
1184        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1185
1186PHONY += headers_install
1187headers_install: __headers
1188        $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1189          $(error Headers not exportable for the $(SRCARCH) architecture))
1190        $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1191        $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1192
1193PHONY += headers_check_all
1194headers_check_all: headers_install_all
1195        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1196
1197PHONY += headers_check
1198headers_check: headers_install
1199        $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1200        $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1201
1202# ---------------------------------------------------------------------------
1203# Kernel selftest
1204
1205PHONY += kselftest
1206kselftest:
1207        $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1208
1209PHONY += kselftest-clean
1210kselftest-clean:
1211        $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1212
1213PHONY += kselftest-merge
1214kselftest-merge:
1215        $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1216        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1217                -m $(objtree)/.config \
1218                $(srctree)/tools/testing/selftests/*/config
1219        +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1220
1221# ---------------------------------------------------------------------------
1222# Devicetree files
1223
1224ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1225dtstree := arch/$(SRCARCH)/boot/dts
1226endif
1227
1228ifneq ($(dtstree),)
1229
1230%.dtb: prepare3 scripts_dtc
1231        $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1232
1233PHONY += dtbs dtbs_install
1234dtbs: prepare3 scripts_dtc
1235        $(Q)$(MAKE) $(build)=$(dtstree)
1236
1237dtbs_install:
1238        $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1239
1240ifdef CONFIG_OF_EARLY_FLATTREE
1241all: dtbs
1242endif
1243
1244endif
1245
1246PHONY += scripts_dtc
1247scripts_dtc: scripts_basic
1248        $(Q)$(MAKE) $(build)=scripts/dtc
1249
1250# ---------------------------------------------------------------------------
1251# Modules
1252
1253ifdef CONFIG_MODULES
1254
1255# By default, build modules as well
1256
1257all: modules
1258
1259# Build modules
1260#
1261# A module can be listed more than once in obj-m resulting in
1262# duplicate lines in modules.order files.  Those are removed
1263# using awk while concatenating to the final file.
1264
1265PHONY += modules
1266modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1267        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1268        @$(kecho) '  Building modules, stage 2.';
1269        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1270
1271modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1272        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1273
1274%/modules.builtin: include/config/auto.conf include/config/tristate.conf
1275        $(Q)$(MAKE) $(modbuiltin)=$*
1276
1277
1278# Target to prepare building external modules
1279PHONY += modules_prepare
1280modules_prepare: prepare scripts
1281
1282# Target to install modules
1283PHONY += modules_install
1284modules_install: _modinst_ _modinst_post
1285
1286PHONY += _modinst_
1287_modinst_:
1288        @rm -rf $(MODLIB)/kernel
1289        @rm -f $(MODLIB)/source
1290        @mkdir -p $(MODLIB)/kernel
1291        @ln -s $(abspath $(srctree)) $(MODLIB)/source
1292        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1293                rm -f $(MODLIB)/build ; \
1294                ln -s $(CURDIR) $(MODLIB)/build ; \
1295        fi
1296        @cp -f $(objtree)/modules.order $(MODLIB)/
1297        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1298        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1299
1300# This depmod is only for convenience to give the initial
1301# boot a modules.dep even before / is mounted read-write.  However the
1302# boot script depmod is the master version.
1303PHONY += _modinst_post
1304_modinst_post: _modinst_
1305        $(call cmd,depmod)
1306
1307ifeq ($(CONFIG_MODULE_SIG), y)
1308PHONY += modules_sign
1309modules_sign:
1310        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1311endif
1312
1313else # CONFIG_MODULES
1314
1315# Modules not configured
1316# ---------------------------------------------------------------------------
1317
1318PHONY += modules modules_install
1319modules modules_install:
1320        @echo >&2
1321        @echo >&2 "The present kernel configuration has modules disabled."
1322        @echo >&2 "Type 'make config' and enable loadable module support."
1323        @echo >&2 "Then build a kernel with module support enabled."
1324        @echo >&2
1325        @exit 1
1326
1327endif # CONFIG_MODULES
1328
1329###
1330# Cleaning is done on three levels.
1331# make clean     Delete most generated files
1332#                Leave enough to build external modules
1333# make mrproper  Delete the current configuration, and all generated files
1334# make distclean Remove editor backup files, patch leftover files and the like
1335
1336# Directories & files removed with 'make clean'
1337CLEAN_DIRS  += $(MODVERDIR) include/ksym
1338
1339# Directories & files removed with 'make mrproper'
1340MRPROPER_DIRS  += include/config usr/include include/generated          \
1341                  arch/*/include/generated .tmp_objdiff
1342MRPROPER_FILES += .config .config.old .version \
1343                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1344                  signing_key.pem signing_key.priv signing_key.x509     \
1345                  x509.genkey extra_certificates signing_key.x509.keyid \
1346                  signing_key.x509.signer vmlinux-gdb.py
1347
1348# clean - Delete most, but leave enough to build external modules
1349#
1350clean: rm-dirs  := $(CLEAN_DIRS)
1351clean: rm-files := $(CLEAN_FILES)
1352clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1353
1354PHONY += $(clean-dirs) clean archclean vmlinuxclean
1355$(clean-dirs):
1356        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1357
1358vmlinuxclean:
1359        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1360        $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1361
1362clean: archclean vmlinuxclean
1363
1364# mrproper - Delete all generated files, including .config
1365#
1366mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1367mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1368mrproper-dirs      := $(addprefix _mrproper_,scripts)
1369
1370PHONY += $(mrproper-dirs) mrproper archmrproper
1371$(mrproper-dirs):
1372        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1373
1374mrproper: clean archmrproper $(mrproper-dirs)
1375        $(call cmd,rmdirs)
1376        $(call cmd,rmfiles)
1377
1378# distclean
1379#
1380PHONY += distclean
1381
1382distclean: mrproper
1383        @find $(srctree) $(RCS_FIND_IGNORE) \
1384                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1385                -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1386                -o -name 'core' \) \
1387                -type f -print | xargs rm -f
1388
1389
1390# Packaging of the kernel to various formats
1391# ---------------------------------------------------------------------------
1392package-dir     := scripts/package
1393
1394%src-pkg: FORCE
1395        $(Q)$(MAKE) $(build)=$(package-dir) $@
1396%pkg: include/config/kernel.release FORCE
1397        $(Q)$(MAKE) $(build)=$(package-dir) $@
1398
1399
1400# Brief documentation of the typical targets used
1401# ---------------------------------------------------------------------------
1402
1403boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1404boards := $(sort $(notdir $(boards)))
1405board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1406board-dirs := $(sort $(notdir $(board-dirs:/=)))
1407
1408PHONY += help
1409help:
1410        @echo  'Cleaning targets:'
1411        @echo  '  clean           - Remove most generated files but keep the config and'
1412        @echo  '                    enough build support to build external modules'
1413        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1414        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1415        @echo  ''
1416        @echo  'Configuration targets:'
1417        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1418        @echo  ''
1419        @echo  'Other generic targets:'
1420        @echo  '  all             - Build all targets marked with [*]'
1421        @echo  '* vmlinux         - Build the bare kernel'
1422        @echo  '* modules         - Build all modules'
1423        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1424        @echo  '  dir/            - Build all files in dir and below'
1425        @echo  '  dir/file.[ois]  - Build specified target only'
1426        @echo  '  dir/file.ll     - Build the LLVM assembly file'
1427        @echo  '                    (requires compiler support for LLVM assembly generation)'
1428        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1429        @echo  '                    (requires a recent binutils and recent build (System.map))'
1430        @echo  '  dir/file.ko     - Build module including final link'
1431        @echo  '  modules_prepare - Set up for building external modules'
1432        @echo  '  tags/TAGS       - Generate tags file for editors'
1433        @echo  '  cscope          - Generate cscope index'
1434        @echo  '  gtags           - Generate GNU GLOBAL index'
1435        @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1436        @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1437        @echo  '  image_name      - Output the image name (use with make -s)'
1438        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1439         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1440         echo  ''
1441        @echo  'Static analysers:'
1442        @echo  '  checkstack      - Generate a list of stack hogs'
1443        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1444        @echo  '  versioncheck    - Sanity check on version.h usage'
1445        @echo  '  includecheck    - Check for duplicate included header files'
1446        @echo  '  export_report   - List the usages of all exported symbols'
1447        @echo  '  headers_check   - Sanity check on exported headers'
1448        @echo  '  headerdep       - Detect inclusion cycles in headers'
1449        @echo  '  coccicheck      - Check with Coccinelle'
1450        @echo  ''
1451        @echo  'Kernel selftest:'
1452        @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1453        @echo  '                    Build, install, and boot kernel before'
1454        @echo  '                    running kselftest on it'
1455        @echo  '  kselftest-clean - Remove all generated kselftest files'
1456        @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1457        @echo  '                    .config.'
1458        @echo  ''
1459        @$(if $(dtstree), \
1460                echo 'Devicetree:'; \
1461                echo '* dtbs            - Build device tree blobs for enabled boards'; \
1462                echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1463                echo '')
1464
1465        @echo 'Userspace tools targets:'
1466        @echo '  use "make tools/help"'
1467        @echo '  or  "cd tools; make help"'
1468        @echo  ''
1469        @echo  'Kernel packaging:'
1470        @$(MAKE) $(build)=$(package-dir) help
1471        @echo  ''
1472        @echo  'Documentation targets:'
1473        @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1474        @echo  ''
1475        @echo  'Architecture specific targets ($(SRCARCH)):'
1476        @$(if $(archhelp),$(archhelp),\
1477                echo '  No architecture specific help defined for $(SRCARCH)')
1478        @echo  ''
1479        @$(if $(boards), \
1480                $(foreach b, $(boards), \
1481                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1482                echo '')
1483        @$(if $(board-dirs), \
1484                $(foreach b, $(board-dirs), \
1485                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1486                printf "  %-16s - Show all of the above\\n" help-boards; \
1487                echo '')
1488
1489        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1490        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1491        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1492        @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1493        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1494        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1495        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1496        @echo  '                1: warnings which may be relevant and do not occur too often'
1497        @echo  '                2: warnings which occur quite often but may still be relevant'
1498        @echo  '                3: more obscure warnings, can most likely be ignored'
1499        @echo  '                Multiple levels can be combined with W=12 or W=123'
1500        @echo  ''
1501        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1502        @echo  'For further info see the ./README file'
1503
1504
1505help-board-dirs := $(addprefix help-,$(board-dirs))
1506
1507help-boards: $(help-board-dirs)
1508
1509boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1510
1511$(help-board-dirs): help-%:
1512        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1513        @$(if $(boards-per-dir), \
1514                $(foreach b, $(boards-per-dir), \
1515                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1516                echo '')
1517
1518
1519# Documentation targets
1520# ---------------------------------------------------------------------------
1521DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1522               linkcheckdocs dochelp refcheckdocs
1523PHONY += $(DOC_TARGETS)
1524$(DOC_TARGETS): scripts_basic FORCE
1525        $(Q)$(MAKE) $(build)=Documentation $@
1526
1527else # KBUILD_EXTMOD
1528
1529###
1530# External module support.
1531# When building external modules the kernel used as basis is considered
1532# read-only, and no consistency checks are made and the make
1533# system is not used on the basis kernel. If updates are required
1534# in the basis kernel ordinary make commands (without M=...) must
1535# be used.
1536#
1537# The following are the only valid targets when building external
1538# modules.
1539# make M=dir clean     Delete all automatically generated files
1540# make M=dir modules   Make all modules in specified dir
1541# make M=dir           Same as 'make M=dir modules'
1542# make M=dir modules_install
1543#                      Install the modules built in the module directory
1544#                      Assumes install directory is already created
1545
1546# We are always building modules
1547KBUILD_MODULES := 1
1548PHONY += crmodverdir
1549crmodverdir:
1550        $(cmd_crmodverdir)
1551
1552PHONY += $(objtree)/Module.symvers
1553$(objtree)/Module.symvers:
1554        @test -e $(objtree)/Module.symvers || ( \
1555        echo; \
1556        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1557        echo "           is missing; modules will have no dependencies and modversions."; \
1558        echo )
1559
1560module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1561PHONY += $(module-dirs) modules
1562$(module-dirs): crmodverdir $(objtree)/Module.symvers
1563        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1564
1565modules: $(module-dirs)
1566        @$(kecho) '  Building modules, stage 2.';
1567        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1568
1569PHONY += modules_install
1570modules_install: _emodinst_ _emodinst_post
1571
1572install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1573PHONY += _emodinst_
1574_emodinst_:
1575        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1576        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1577
1578PHONY += _emodinst_post
1579_emodinst_post: _emodinst_
1580        $(call cmd,depmod)
1581
1582clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1583
1584PHONY += $(clean-dirs) clean
1585$(clean-dirs):
1586        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1587
1588clean:  rm-dirs := $(MODVERDIR)
1589clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1590
1591PHONY += help
1592help:
1593        @echo  '  Building external modules.'
1594        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1595        @echo  ''
1596        @echo  '  modules         - default target, build the module(s)'
1597        @echo  '  modules_install - install the module'
1598        @echo  '  clean           - remove generated files in module directory only'
1599        @echo  ''
1600
1601# Dummies...
1602PHONY += prepare scripts
1603prepare: ;
1604scripts: ;
1605endif # KBUILD_EXTMOD
1606
1607clean: $(clean-dirs)
1608        $(call cmd,rmdirs)
1609        $(call cmd,rmfiles)
1610        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1611                \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1612                -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1613                -o -name '*.dwo' -o -name '*.lst' \
1614                -o -name '*.su'  \
1615                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1616                -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1617                -o -name '*.asn1.[ch]' \
1618                -o -name '*.symtypes' -o -name 'modules.order' \
1619                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1620                -o -name '*.c.[012]*.*' \
1621                -o -name '*.ll' \
1622                -o -name '*.gcno' \) -type f -print | xargs rm -f
1623
1624# Generate tags for editors
1625# ---------------------------------------------------------------------------
1626quiet_cmd_tags = GEN     $@
1627      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1628
1629tags TAGS cscope gtags: FORCE
1630        $(call cmd,tags)
1631
1632# Scripts to check various things for consistency
1633# ---------------------------------------------------------------------------
1634
1635PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1636
1637includecheck:
1638        find $(srctree)/* $(RCS_FIND_IGNORE) \
1639                -name '*.[hcS]' -type f -print | sort \
1640                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1641
1642versioncheck:
1643        find $(srctree)/* $(RCS_FIND_IGNORE) \
1644                -name '*.[hcS]' -type f -print | sort \
1645                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1646
1647coccicheck:
1648        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1649
1650namespacecheck:
1651        $(PERL) $(srctree)/scripts/namespace.pl
1652
1653export_report:
1654        $(PERL) $(srctree)/scripts/export_report.pl
1655
1656PHONY += checkstack kernelrelease kernelversion image_name
1657
1658# UML needs a little special treatment here.  It wants to use the host
1659# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1660# else wants $(ARCH), including people doing cross-builds, which means
1661# that $(SUBARCH) doesn't work here.
1662ifeq ($(ARCH), um)
1663CHECKSTACK_ARCH := $(SUBARCH)
1664else
1665CHECKSTACK_ARCH := $(ARCH)
1666endif
1667checkstack:
1668        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1669        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1670
1671kernelrelease:
1672        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1673
1674kernelversion:
1675        @echo $(KERNELVERSION)
1676
1677image_name:
1678        @echo $(KBUILD_IMAGE)
1679
1680# Clear a bunch of variables before executing the submake
1681tools/: FORCE
1682        $(Q)mkdir -p $(objtree)/tools
1683        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1684
1685tools/%: FORCE
1686        $(Q)mkdir -p $(objtree)/tools
1687        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1688
1689# Single targets
1690# ---------------------------------------------------------------------------
1691# Single targets are compatible with:
1692# - build with mixed source and output
1693# - build with separate output dir 'make O=...'
1694# - external modules
1695#
1696#  target-dir => where to store outputfile
1697#  build-dir  => directory in kernel source tree to use
1698
1699ifeq ($(KBUILD_EXTMOD),)
1700        build-dir  = $(patsubst %/,%,$(dir $@))
1701        target-dir = $(dir $@)
1702else
1703        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1704        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1705        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1706endif
1707
1708%.s: %.c prepare scripts FORCE
1709        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1710%.i: %.c prepare scripts FORCE
1711        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1712%.o: %.c prepare scripts FORCE
1713        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1714%.lst: %.c prepare scripts FORCE
1715        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1716%.s: %.S prepare scripts FORCE
1717        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1718%.o: %.S prepare scripts FORCE
1719        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1720%.symtypes: %.c prepare scripts FORCE
1721        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1722%.ll: %.c prepare scripts FORCE
1723        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1724
1725# Modules
1726/: prepare scripts FORCE
1727        $(cmd_crmodverdir)
1728        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1729        $(build)=$(build-dir)
1730# Make sure the latest headers are built for Documentation
1731Documentation/ samples/: headers_install
1732%/: prepare scripts FORCE
1733        $(cmd_crmodverdir)
1734        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1735        $(build)=$(build-dir)
1736%.ko: prepare scripts FORCE
1737        $(cmd_crmodverdir)
1738        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1739        $(build)=$(build-dir) $(@:.ko=.o)
1740        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1741
1742# FIXME Should go into a make.lib or something
1743# ===========================================================================
1744
1745quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1746      cmd_rmdirs = rm -rf $(rm-dirs)
1747
1748quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1749      cmd_rmfiles = rm -f $(rm-files)
1750
1751# Run depmod only if we have System.map and depmod is executable
1752quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1753      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1754                   $(KERNELRELEASE)
1755
1756# Create temporary dir for module support files
1757# clean it up only when building all modules
1758cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1759                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1760
1761# read all saved command lines
1762cmd_files := $(wildcard .*.cmd)
1763
1764ifneq ($(cmd_files),)
1765  $(cmd_files): ;       # Do not try to update included dependency files
1766  include $(cmd_files)
1767endif
1768
1769endif   # ifeq ($(config-targets),1)
1770endif   # ifeq ($(mixed-targets),1)
1771endif   # skip-makefile
1772
1773PHONY += FORCE
1774FORCE:
1775
1776# Declare the contents of the PHONY variable as phony.  We keep that
1777# information in a variable so we can use it in if_changed and friends.
1778.PHONY: $(PHONY)
1779