Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 9
   3 SUBLEVEL = 79
   4 EXTRAVERSION =
   5 NAME = Roaring Lionus
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # o Do not use make's built-in rules and variables
  14 #   (this increases performance and avoids hard-to-debug behaviour);
  15 # o Look for make include files relative to root of kernel src
  16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  17
  18 # Avoid funny character set dependencies
  19 unexport LC_ALL
  20 LC_COLLATE=C
  21 LC_NUMERIC=C
  22 export LC_COLLATE LC_NUMERIC
  23
  24 # Avoid interference with shell env settings
  25 unexport GREP_OPTIONS
  26
  27 # We are using a recursive build, so we need to do a little thinking
  28 # to get the ordering right.
  29 #
  30 # Most importantly: sub-Makefiles should only ever modify files in
  31 # their own directory. If in some directory we have a dependency on
  32 # a file in another dir (which doesn't happen often, but it's often
  33 # unavoidable when linking the built-in.o targets which finally
  34 # turn into vmlinux), we will call a sub make in that other dir, and
  35 # after that we are sure that everything which is in that other dir
  36 # is now up to date.
  37 #
  38 # The only cases where we need to modify files which have global
  39 # effects are thus separated out and done before the recursive
  40 # descending is started. They are now explicitly listed as the
  41 # prepare rule.
  42
  43 # Beautify output
  44 # ---------------------------------------------------------------------------
  45 #
  46 # Normally, we echo the whole command before executing it. By making
  47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  48 # $(quiet) to choose other forms of output instead, e.g.
  49 #
  50 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  51 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  52 #
  53 # If $(quiet) is empty, the whole command will be printed.
  54 # If it is set to "quiet_", only the short version will be printed.
  55 # If it is set to "silent_", nothing will be printed at all, since
  56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  57 #
  58 # A simple variant is to prefix commands with $(Q) - that's useful
  59 # for commands that shall be hidden in non-verbose mode.
  60 #
  61 #       $(Q)ln $@ :<
  62 #
  63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  65 #
  66 # To put more focus on warnings, be less verbose as default
  67 # Use 'make V=1' to see the full commands
  68
  69 ifeq ("$(origin V)", "command line")
  70   KBUILD_VERBOSE = $(V)
  71 endif
  72 ifndef KBUILD_VERBOSE
  73   KBUILD_VERBOSE = 0
  74 endif
  75
  76 ifeq ($(KBUILD_VERBOSE),1)
  77   quiet =
  78   Q =
  79 else
  80   quiet=quiet_
  81   Q = @
  82 endif
  83
  84 # If the user is running make -s (silent mode), suppress echoing of
  85 # commands
  86
  87 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  89   quiet=silent_
  90 endif
  91 else                                    # make-3.8x
  92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  93   quiet=silent_
  94 endif
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is set on invocation of make in OBJ directory
 115 # KBUILD_SRC is not intended to be used by the regular user (for now)
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # That's our default target when none is given on the command line
 125 PHONY := _all
 126 _all:
 127
 128 # Cancel implicit rules on top Makefile
 129 $(CURDIR)/Makefile Makefile: ;
 130
 131 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 132   $(error main directory cannot contain spaces nor colons)
 133 endif
 134
 135 ifneq ($(KBUILD_OUTPUT),)
 136 # Invoke a second make in the output directory, passing relevant variables
 137 # check that the output directory actually exists
 138 saved-output := $(KBUILD_OUTPUT)
 139 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 140                                                                 && /bin/pwd)
 141 $(if $(KBUILD_OUTPUT),, \
 142      $(error failed to create output directory "$(saved-output)"))
 143
 144 PHONY += $(MAKECMDGOALS) sub-make
 145
 146 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 147         @:
 148
 149 sub-make:
 150         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 151         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 152
 153 # Leave processing to above invocation of make
 154 skip-makefile := 1
 155 endif # ifneq ($(KBUILD_OUTPUT),)
 156 endif # ifeq ($(KBUILD_SRC),)
 157
 158 # We process the rest of the Makefile if this is the final invocation of make
 159 ifeq ($(skip-makefile),)
 160
 161 # Do not print "Entering directory ...",
 162 # but we want to display it when entering to the output directory
 163 # so that IDEs/editors are able to understand relative filenames.
 164 MAKEFLAGS += --no-print-directory
 165
 166 # Call a source code checker (by default, "sparse") as part of the
 167 # C compilation.
 168 #
 169 # Use 'make C=1' to enable checking of only re-compiled files.
 170 # Use 'make C=2' to enable checking of *all* source files, regardless
 171 # of whether they are re-compiled or not.
 172 #
 173 # See the file "Documentation/sparse.txt" for more details, including
 174 # where to get the "sparse" utility.
 175
 176 ifeq ("$(origin C)", "command line")
 177   KBUILD_CHECKSRC = $(C)
 178 endif
 179 ifndef KBUILD_CHECKSRC
 180   KBUILD_CHECKSRC = 0
 181 endif
 182
 183 # Use make M=dir to specify directory of external module to build
 184 # Old syntax make ... SUBDIRS=$PWD is still supported
 185 # Setting the environment variable KBUILD_EXTMOD take precedence
 186 ifdef SUBDIRS
 187   KBUILD_EXTMOD ?= $(SUBDIRS)
 188 endif
 189
 190 ifeq ("$(origin M)", "command line")
 191   KBUILD_EXTMOD := $(M)
 192 endif
 193
 194 # If building an external module we do not care about the all: rule
 195 # but instead _all depend on modules
 196 PHONY += all
 197 ifeq ($(KBUILD_EXTMOD),)
 198 _all: all
 199 else
 200 _all: modules
 201 endif
 202
 203 ifeq ($(KBUILD_SRC),)
 204         # building in the source tree
 205         srctree := .
 206 else
 207         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 208                 # building in a subdirectory of the source tree
 209                 srctree := ..
 210         else
 211                 srctree := $(KBUILD_SRC)
 212         endif
 213 endif
 214 objtree         := .
 215 src             := $(srctree)
 216 obj             := $(objtree)
 217
 218 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 219
 220 export srctree objtree VPATH
 221
 222 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 223 # first, and if a usermode build is happening, the "ARCH=um" on the command
 224 # line overrides the setting of ARCH below.  If a native build is happening,
 225 # then ARCH is assigned, getting whatever value it gets normally, and
 226 # SUBARCH is subsequently ignored.
 227
 228 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 229                                   -e s/sun4u/sparc64/ \
 230                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 231                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 232                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 233                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 234
 235 # Cross compiling and selecting different set of gcc/bin-utils
 236 # ---------------------------------------------------------------------------
 237 #
 238 # When performing cross compilation for other architectures ARCH shall be set
 239 # to the target architecture. (See arch/* for the possibilities).
 240 # ARCH can be set during invocation of make:
 241 # make ARCH=ia64
 242 # Another way is to have ARCH set in the environment.
 243 # The default ARCH is the host where make is executed.
 244
 245 # CROSS_COMPILE specify the prefix used for all executables used
 246 # during compilation. Only gcc and related bin-utils executables
 247 # are prefixed with $(CROSS_COMPILE).
 248 # CROSS_COMPILE can be set on the command line
 249 # make CROSS_COMPILE=ia64-linux-
 250 # Alternatively CROSS_COMPILE can be set in the environment.
 251 # A third alternative is to store a setting in .config so that plain
 252 # "make" in the configured kernel build directory always uses that.
 253 # Default value for CROSS_COMPILE is not to prefix executables
 254 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 255 ARCH            ?= $(SUBARCH)
 256 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 257
 258 # Architecture as present in compile.h
 259 UTS_MACHINE     := $(ARCH)
 260 SRCARCH         := $(ARCH)
 261
 262 # Additional ARCH settings for x86
 263 ifeq ($(ARCH),i386)
 264         SRCARCH := x86
 265 endif
 266 ifeq ($(ARCH),x86_64)
 267         SRCARCH := x86
 268 endif
 269
 270 # Additional ARCH settings for sparc
 271 ifeq ($(ARCH),sparc32)
 272        SRCARCH := sparc
 273 endif
 274 ifeq ($(ARCH),sparc64)
 275        SRCARCH := sparc
 276 endif
 277
 278 # Additional ARCH settings for sh
 279 ifeq ($(ARCH),sh64)
 280        SRCARCH := sh
 281 endif
 282
 283 # Additional ARCH settings for tile
 284 ifeq ($(ARCH),tilepro)
 285        SRCARCH := tile
 286 endif
 287 ifeq ($(ARCH),tilegx)
 288        SRCARCH := tile
 289 endif
 290
 291 # Where to locate arch specific headers
 292 hdr-arch  := $(SRCARCH)
 293
 294 KCONFIG_CONFIG  ?= .config
 295 export KCONFIG_CONFIG
 296
 297 # SHELL used by kbuild
 298 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 299           else if [ -x /bin/bash ]; then echo /bin/bash; \
 300           else echo sh; fi ; fi)
 301
 302 HOSTCC       = gcc
 303 HOSTCXX      = g++
 304 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 305 HOSTCXXFLAGS = -O2
 306
 307 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 308 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 309                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 310 endif
 311
 312 # Decide whether to build built-in, modular, or both.
 313 # Normally, just do built-in.
 314
 315 KBUILD_MODULES :=
 316 KBUILD_BUILTIN := 1
 317
 318 # If we have only "make modules", don't compile built-in objects.
 319 # When we're building modules with modversions, we need to consider
 320 # the built-in objects during the descend as well, in order to
 321 # make sure the checksums are up to date before we record them.
 322
 323 ifeq ($(MAKECMDGOALS),modules)
 324   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 325 endif
 326
 327 # If we have "make <whatever> modules", compile modules
 328 # in addition to whatever we do anyway.
 329 # Just "make" or "make all" shall build modules as well
 330
 331 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 332   KBUILD_MODULES := 1
 333 endif
 334
 335 ifeq ($(MAKECMDGOALS),)
 336   KBUILD_MODULES := 1
 337 endif
 338
 339 export KBUILD_MODULES KBUILD_BUILTIN
 340 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 341
 342 # We need some generic definitions (do not try to remake the file).
 343 scripts/Kbuild.include: ;
 344 include scripts/Kbuild.include
 345
 346 # Make variables (CC, etc...)
 347 AS              = $(CROSS_COMPILE)as
 348 LD              = $(CROSS_COMPILE)ld
 349 CC              = $(CROSS_COMPILE)gcc
 350 CPP             = $(CC) -E
 351 AR              = $(CROSS_COMPILE)ar
 352 NM              = $(CROSS_COMPILE)nm
 353 STRIP           = $(CROSS_COMPILE)strip
 354 OBJCOPY         = $(CROSS_COMPILE)objcopy
 355 OBJDUMP         = $(CROSS_COMPILE)objdump
 356 AWK             = awk
 357 GENKSYMS        = scripts/genksyms/genksyms
 358 INSTALLKERNEL  := installkernel
 359 DEPMOD          = /sbin/depmod
 360 PERL            = perl
 361 PYTHON          = python
 362 CHECK           = sparse
 363
 364 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 365                   -Wbitwise -Wno-return-void $(CF)
 366 NOSTDINC_FLAGS  =
 367 CFLAGS_MODULE   =
 368 AFLAGS_MODULE   =
 369 LDFLAGS_MODULE  =
 370 CFLAGS_KERNEL   =
 371 AFLAGS_KERNEL   =
 372 LDFLAGS_vmlinux =
 373
 374 # Use USERINCLUDE when you must reference the UAPI directories only.
 375 USERINCLUDE    := \
 376                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 377                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 378                 -I$(srctree)/include/uapi \
 379                 -I$(objtree)/include/generated/uapi \
 380                 -include $(srctree)/include/linux/kconfig.h
 381
 382 # Use LINUXINCLUDE when you must reference the include/ directory.
 383 # Needed to be compatible with the O= option
 384 LINUXINCLUDE    := \
 385                 -I$(srctree)/arch/$(hdr-arch)/include \
 386                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 387                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 388                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 389                 -I$(objtree)/include
 390
 391 LINUXINCLUDE    += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
 392
 393 KBUILD_AFLAGS   := -D__ASSEMBLY__
 394 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 395                    -fno-strict-aliasing -fno-common \
 396                    -Werror-implicit-function-declaration \
 397                    -Wno-format-security \
 398                    -std=gnu89
 399 KBUILD_CPPFLAGS := -D__KERNEL__
 400 KBUILD_AFLAGS_KERNEL :=
 401 KBUILD_CFLAGS_KERNEL :=
 402 KBUILD_AFLAGS_MODULE  := -DMODULE
 403 KBUILD_CFLAGS_MODULE  := -DMODULE
 404 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 405 GCC_PLUGINS_CFLAGS :=
 406
 407 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 408 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 409 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 410
 411 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 412 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 413 export CPP AR NM STRIP OBJCOPY OBJDUMP
 414 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 415 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 416
 417 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 418 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_KASAN CFLAGS_UBSAN
 419 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 420 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 421 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 422 export KBUILD_ARFLAGS
 423
 424 # When compiling out-of-tree modules, put MODVERDIR in the module
 425 # tree rather than in the kernel tree. The kernel tree might
 426 # even be read-only.
 427 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 428
 429 # Files to ignore in find ... statements
 430
 431 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 432                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 433                           -prune -o
 434 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 435                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 436
 437 # ===========================================================================
 438 # Rules shared between *config targets and build targets
 439
 440 # Basic helpers built in scripts/
 441 PHONY += scripts_basic
 442 scripts_basic:
 443         $(Q)$(MAKE) $(build)=scripts/basic
 444         $(Q)rm -f .tmp_quiet_recordmcount
 445
 446 # To avoid any implicit rule to kick in, define an empty command.
 447 scripts/basic/%: scripts_basic ;
 448
 449 PHONY += outputmakefile
 450 # outputmakefile generates a Makefile in the output directory, if using a
 451 # separate output directory. This allows convenient use of make in the
 452 # output directory.
 453 outputmakefile:
 454 ifneq ($(KBUILD_SRC),)
 455         $(Q)ln -fsn $(srctree) source
 456         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 457             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 458 endif
 459
 460 # Support for using generic headers in asm-generic
 461 PHONY += asm-generic
 462 asm-generic:
 463         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 464                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 465         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 466                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 467
 468 # To make sure we do not include .config for any of the *config targets
 469 # catch them early, and hand them over to scripts/kconfig/Makefile
 470 # It is allowed to specify more targets when calling make, including
 471 # mixing *config targets and build targets.
 472 # For example 'make oldconfig all'.
 473 # Detect when mixed targets is specified, and make a second invocation
 474 # of make so .config is not included in this case either (for *config).
 475
 476 version_h := include/generated/uapi/linux/version.h
 477 old_version_h := include/linux/version.h
 478
 479 no-dot-config-targets := clean mrproper distclean \
 480                          cscope gtags TAGS tags help% %docs check% coccicheck \
 481                          $(version_h) headers_% archheaders archscripts \
 482                          kernelversion %src-pkg
 483
 484 config-targets := 0
 485 mixed-targets  := 0
 486 dot-config     := 1
 487
 488 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 489         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 490                 dot-config := 0
 491         endif
 492 endif
 493
 494 ifeq ($(KBUILD_EXTMOD),)
 495         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 496                 config-targets := 1
 497                 ifneq ($(words $(MAKECMDGOALS)),1)
 498                         mixed-targets := 1
 499                 endif
 500         endif
 501 endif
 502 # install and module_install need also be processed one by one
 503 ifneq ($(filter install,$(MAKECMDGOALS)),)
 504         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 505                 mixed-targets := 1
 506         endif
 507 endif
 508
 509 ifeq ($(mixed-targets),1)
 510 # ===========================================================================
 511 # We're called with mixed targets (*config and build targets).
 512 # Handle them one by one.
 513
 514 PHONY += $(MAKECMDGOALS) __build_one_by_one
 515
 516 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 517         @:
 518
 519 __build_one_by_one:
 520         $(Q)set -e; \
 521         for i in $(MAKECMDGOALS); do \
 522                 $(MAKE) -f $(srctree)/Makefile $$i; \
 523         done
 524
 525 else
 526 ifeq ($(config-targets),1)
 527 # ===========================================================================
 528 # *config targets only - make sure prerequisites are updated, and descend
 529 # in scripts/kconfig to make the *config target
 530
 531 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 532 # KBUILD_DEFCONFIG may point out an alternative default configuration
 533 # used for 'make defconfig'
 534 include arch/$(SRCARCH)/Makefile
 535 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 536
 537 config: scripts_basic outputmakefile FORCE
 538         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 539
 540 %config: scripts_basic outputmakefile FORCE
 541         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 542
 543 else
 544 # ===========================================================================
 545 # Build targets only - this includes vmlinux, arch specific targets, clean
 546 # targets and others. In general all targets except *config targets.
 547
 548 ifeq ($(KBUILD_EXTMOD),)
 549 # Additional helpers built in scripts/
 550 # Carefully list dependencies so we do not try to build scripts twice
 551 # in parallel
 552 PHONY += scripts
 553 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 554          asm-generic gcc-plugins
 555         $(Q)$(MAKE) $(build)=$(@)
 556
 557 # Objects we will link into vmlinux / subdirs we need to visit
 558 init-y          := init/
 559 drivers-y       := drivers/ sound/ firmware/
 560 net-y           := net/
 561 libs-y          := lib/
 562 core-y          := usr/
 563 virt-y          := virt/
 564 endif # KBUILD_EXTMOD
 565
 566 ifeq ($(dot-config),1)
 567 # Read in config
 568 -include include/config/auto.conf
 569
 570 ifeq ($(KBUILD_EXTMOD),)
 571 # Read in dependencies to all Kconfig* files, make sure to run
 572 # oldconfig if changes are detected.
 573 -include include/config/auto.conf.cmd
 574
 575 # To avoid any implicit rule to kick in, define an empty command
 576 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 577
 578 # If .config is newer than include/config/auto.conf, someone tinkered
 579 # with it and forgot to run make oldconfig.
 580 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 581 # we execute the config step to be sure to catch updated Kconfig files
 582 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 583         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 584 else
 585 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 586 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 587 PHONY += include/config/auto.conf
 588
 589 include/config/auto.conf:
 590         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 591         echo >&2;                                                       \
 592         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 593         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 594         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 595         echo >&2 ;                                                      \
 596         /bin/false)
 597
 598 endif # KBUILD_EXTMOD
 599
 600 else
 601 # Dummy target needed, because used as prerequisite
 602 include/config/auto.conf: ;
 603 endif # $(dot-config)
 604
 605 # For the kernel to actually contain only the needed exported symbols,
 606 # we have to build modules as well to determine what those symbols are.
 607 # (this can be evaluated only once include/config/auto.conf has been included)
 608 ifdef CONFIG_TRIM_UNUSED_KSYMS
 609   KBUILD_MODULES := 1
 610 endif
 611
 612 # The all: target is the default when no target is given on the
 613 # command line.
 614 # This allow a user to issue only 'make' to build a kernel including modules
 615 # Defaults to vmlinux, but the arch makefile usually adds further targets
 616 all: vmlinux
 617
 618 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 619 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 620 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 621 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 622 export CFLAGS_GCOV CFLAGS_KCOV
 623
 624 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 625 # values of the respective KBUILD_* variables
 626 ARCH_CPPFLAGS :=
 627 ARCH_AFLAGS :=
 628 ARCH_CFLAGS :=
 629 include arch/$(SRCARCH)/Makefile
 630
 631 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 632 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 633 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 634 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 635 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 636
 637 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 638 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 639 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 640 endif
 641
 642 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 643 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 644 else
 645 ifdef CONFIG_PROFILE_ALL_BRANCHES
 646 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 647 else
 648 KBUILD_CFLAGS   += -O2
 649 endif
 650 endif
 651
 652 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 653                         $(call cc-disable-warning,maybe-uninitialized,))
 654
 655 # Tell gcc to never replace conditional load with a non-conditional one
 656 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 657
 658 # check for 'asm goto'
 659 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 660         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 661         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 662 endif
 663
 664 include scripts/Makefile.gcc-plugins
 665
 666 ifdef CONFIG_READABLE_ASM
 667 # Disable optimizations that make assembler listings hard to read.
 668 # reorder blocks reorders the control in the function
 669 # ipa clone creates specialized cloned functions
 670 # partial inlining inlines only parts of functions
 671 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 672                  $(call cc-option,-fno-ipa-cp-clone,) \
 673                  $(call cc-option,-fno-partial-inlining)
 674 endif
 675
 676 ifneq ($(CONFIG_FRAME_WARN),0)
 677 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 678 endif
 679
 680 # This selects the stack protector compiler flag. Testing it is delayed
 681 # until after .config has been reprocessed, in the prepare-compiler-check
 682 # target.
 683 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 684   stackp-flag := -fstack-protector
 685   stackp-name := REGULAR
 686 else
 687 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 688   stackp-flag := -fstack-protector-strong
 689   stackp-name := STRONG
 690 else
 691   # Force off for distro compilers that enable stack protector by default.
 692   stackp-flag := $(call cc-option, -fno-stack-protector)
 693 endif
 694 endif
 695 # Find arch-specific stack protector compiler sanity-checking script.
 696 ifdef CONFIG_CC_STACKPROTECTOR
 697   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 698   stackp-check := $(wildcard $(stackp-path))
 699 endif
 700 KBUILD_CFLAGS += $(stackp-flag)
 701
 702 ifeq ($(cc-name),clang)
 703 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 704 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 705 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 706 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 707 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 708 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 709 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 710 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 711 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 712 # See modpost pattern 2
 713 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 714 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 715 else
 716
 717 # These warnings generated too much noise in a regular build.
 718 # Use make W=1 to enable them (see scripts/Makefile.build)
 719 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 720 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 721 endif
 722
 723 ifdef CONFIG_FRAME_POINTER
 724 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 725 else
 726 # Some targets (ARM with Thumb2, for example), can't be built with frame
 727 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 728 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 729 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 730 # -fomit-frame-pointer with FUNCTION_TRACER.
 731 ifndef CONFIG_FUNCTION_TRACER
 732 KBUILD_CFLAGS   += -fomit-frame-pointer
 733 endif
 734 endif
 735
 736 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 737
 738 ifdef CONFIG_DEBUG_INFO
 739 ifdef CONFIG_DEBUG_INFO_SPLIT
 740 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 741 else
 742 KBUILD_CFLAGS   += -g
 743 endif
 744 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 745 endif
 746 ifdef CONFIG_DEBUG_INFO_DWARF4
 747 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 748 endif
 749
 750 ifdef CONFIG_DEBUG_INFO_REDUCED
 751 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 752                    $(call cc-option,-fno-var-tracking)
 753 endif
 754
 755 ifdef CONFIG_FUNCTION_TRACER
 756 ifndef CC_FLAGS_FTRACE
 757 CC_FLAGS_FTRACE := -pg
 758 endif
 759 export CC_FLAGS_FTRACE
 760 ifdef CONFIG_HAVE_FENTRY
 761 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 762 endif
 763 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 764 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 765 ifdef CONFIG_DYNAMIC_FTRACE
 766         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 767                 BUILD_C_RECORDMCOUNT := y
 768                 export BUILD_C_RECORDMCOUNT
 769         endif
 770 endif
 771 endif
 772
 773 # We trigger additional mismatches with less inlining
 774 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 775 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 776 endif
 777
 778 # arch Makefile may override CC so keep this after arch Makefile is included
 779 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 780 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 781
 782 # warn about C99 declaration after statement
 783 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 784
 785 # disable pointer signed / unsigned warnings in gcc 4.0
 786 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 787
 788 # disable invalid "can't wrap" optimizations for signed / pointers
 789 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 790
 791 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 792 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 793
 794 # conserve stack if available
 795 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 796
 797 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 798 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 799
 800 # require functions to have arguments in prototypes, not empty 'int foo()'
 801 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 802
 803 # Prohibit date/time macros, which would make the build non-deterministic
 804 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 805
 806 # enforce correct pointer usage
 807 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 808
 809 # use the deterministic mode of AR if available
 810 KBUILD_ARFLAGS := $(call ar-option,D)
 811
 812 include scripts/Makefile.kasan
 813 include scripts/Makefile.extrawarn
 814 include scripts/Makefile.ubsan
 815
 816 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 817 # last assignments
 818 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 819 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 820 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 821
 822 # Use --build-id when available.
 823 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 824                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 825 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 826 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 827
 828 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 829 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 830 endif
 831
 832 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 833 LDFLAGS_vmlinux += $(call ld-option, -X,)
 834 endif
 835
 836 # Default kernel image to build when no specific target is given.
 837 # KBUILD_IMAGE may be overruled on the command line or
 838 # set in the environment
 839 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 840 # this default value
 841 export KBUILD_IMAGE ?= vmlinux
 842
 843 #
 844 # INSTALL_PATH specifies where to place the updated kernel and system map
 845 # images. Default is /boot, but you can set it to other values
 846 export  INSTALL_PATH ?= /boot
 847
 848 #
 849 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 850 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 851 # an argument if needed. Otherwise it defaults to the kernel install path
 852 #
 853 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 854
 855 #
 856 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 857 # relocations required by build roots.  This is not defined in the
 858 # makefile but the argument can be passed to make if needed.
 859 #
 860
 861 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 862 export MODLIB
 863
 864 #
 865 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 866 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 867 # the default option --strip-debug will be used.  Otherwise,
 868 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 869
 870 ifdef INSTALL_MOD_STRIP
 871 ifeq ($(INSTALL_MOD_STRIP),1)
 872 mod_strip_cmd = $(STRIP) --strip-debug
 873 else
 874 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 875 endif # INSTALL_MOD_STRIP=1
 876 else
 877 mod_strip_cmd = true
 878 endif # INSTALL_MOD_STRIP
 879 export mod_strip_cmd
 880
 881 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 882 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 883 # or CONFIG_MODULE_COMPRESS_XZ.
 884
 885 mod_compress_cmd = true
 886 ifdef CONFIG_MODULE_COMPRESS
 887   ifdef CONFIG_MODULE_COMPRESS_GZIP
 888     mod_compress_cmd = gzip -n -f
 889   endif # CONFIG_MODULE_COMPRESS_GZIP
 890   ifdef CONFIG_MODULE_COMPRESS_XZ
 891     mod_compress_cmd = xz -f
 892   endif # CONFIG_MODULE_COMPRESS_XZ
 893 endif # CONFIG_MODULE_COMPRESS
 894 export mod_compress_cmd
 895
 896 # Select initial ramdisk compression format, default is gzip(1).
 897 # This shall be used by the dracut(8) tool while creating an initramfs image.
 898 #
 899 INITRD_COMPRESS-y                  := gzip
 900 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 901 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 902 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 903 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 904 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 905 # do not export INITRD_COMPRESS, since we didn't actually
 906 # choose a sane default compression above.
 907 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 908
 909 ifdef CONFIG_MODULE_SIG_ALL
 910 $(eval $(call config_filename,MODULE_SIG_KEY))
 911
 912 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 913 else
 914 mod_sign_cmd = true
 915 endif
 916 export mod_sign_cmd
 917
 918
 919 ifeq ($(KBUILD_EXTMOD),)
 920 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 921
 922 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 923                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 924                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 925
 926 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 927                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 928
 929 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 930 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 931 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 932 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 933 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 934 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 935 libs-y          := $(libs-y1) $(libs-y2)
 936 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 937
 938 # Externally visible symbols (used by link-vmlinux.sh)
 939 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 940 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 941 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 942 export LDFLAGS_vmlinux
 943 # used by scripts/pacmage/Makefile
 944 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 945
 946 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 947
 948 # Include targets which we want to execute sequentially if the rest of the
 949 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 950 # evaluated more than once.
 951 PHONY += vmlinux_prereq
 952 vmlinux_prereq: $(vmlinux-deps) FORCE
 953 ifdef CONFIG_HEADERS_CHECK
 954         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 955 endif
 956 ifdef CONFIG_GDB_SCRIPTS
 957         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 958 endif
 959 ifdef CONFIG_TRIM_UNUSED_KSYMS
 960         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 961           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 962 endif
 963
 964 # standalone target for easier testing
 965 include/generated/autoksyms.h: FORCE
 966         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 967
 968 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 969
 970 # Final link of vmlinux with optional arch pass after final link
 971     cmd_link-vmlinux =                                                 \
 972         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
 973         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 974
 975 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
 976         +$(call if_changed,link-vmlinux)
 977
 978 # Build samples along the rest of the kernel
 979 ifdef CONFIG_SAMPLES
 980 vmlinux-dirs += samples
 981 endif
 982
 983 # The actual objects are generated when descending,
 984 # make sure no implicit rule kicks in
 985 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 986
 987 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 988 # Preset locale variables to speed up the build process. Limit locale
 989 # tweaks to this spot to avoid wrong language settings when running
 990 # make menuconfig etc.
 991 # Error messages still appears in the original language
 992
 993 PHONY += $(vmlinux-dirs)
 994 $(vmlinux-dirs): prepare scripts
 995         $(Q)$(MAKE) $(build)=$@
 996
 997 define filechk_kernel.release
 998         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 999 endef
1000
1001 # Store (new) KERNELRELEASE string in include/config/kernel.release
1002 include/config/kernel.release: include/config/auto.conf FORCE
1003         $(call filechk,kernel.release)
1004
1005
1006 # Things we need to do before we recursively start building the kernel
1007 # or the modules are listed in "prepare".
1008 # A multi level approach is used. prepareN is processed before prepareN-1.
1009 # archprepare is used in arch Makefiles and when processed asm symlink,
1010 # version.h and scripts_basic is processed / created.
1011
1012 # Listed in dependency order
1013 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1014
1015 # prepare3 is used to check if we are building in a separate output directory,
1016 # and if so do:
1017 # 1) Check that make has not been executed in the kernel src $(srctree)
1018 prepare3: include/config/kernel.release
1019 ifneq ($(KBUILD_SRC),)
1020         @$(kecho) '  Using $(srctree) as source for kernel'
1021         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1022                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1023                 echo >&2 "  in the '$(srctree)' directory.";\
1024                 /bin/false; \
1025         fi;
1026 endif
1027
1028 # prepare2 creates a makefile if using a separate output directory.
1029 # From this point forward, .config has been reprocessed, so any rules
1030 # that need to depend on updated CONFIG_* values can be checked here.
1031 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1032
1033 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1034                    include/config/auto.conf
1035         $(cmd_crmodverdir)
1036
1037 archprepare: archheaders archscripts prepare1 scripts_basic
1038
1039 prepare0: archprepare gcc-plugins
1040         $(Q)$(MAKE) $(build)=.
1041
1042 # All the preparing..
1043 prepare: prepare0 prepare-objtool
1044
1045 ifdef CONFIG_STACK_VALIDATION
1046   has_libelf := $(call try-run,\
1047                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1048   ifeq ($(has_libelf),1)
1049     objtool_target := tools/objtool FORCE
1050   else
1051     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1052     SKIP_STACK_VALIDATION := 1
1053     export SKIP_STACK_VALIDATION
1054   endif
1055 endif
1056
1057 PHONY += prepare-objtool
1058 prepare-objtool: $(objtool_target)
1059
1060 # Check for CONFIG flags that require compiler support. Abort the build
1061 # after .config has been processed, but before the kernel build starts.
1062 #
1063 # For security-sensitive CONFIG options, we don't want to fallback and/or
1064 # silently change which compiler flags will be used, since that leads to
1065 # producing kernels with different security feature characteristics
1066 # depending on the compiler used. (For example, "But I selected
1067 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1068 PHONY += prepare-compiler-check
1069 prepare-compiler-check: FORCE
1070 # Make sure compiler supports requested stack protector flag.
1071 ifdef stackp-name
1072   ifeq ($(call cc-option, $(stackp-flag)),)
1073         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1074                   $(stackp-flag) not supported by compiler >&2 && exit 1
1075   endif
1076 endif
1077 # Make sure compiler does not have buggy stack-protector support.
1078 ifdef stackp-check
1079   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1080         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1081                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1082   endif
1083 endif
1084         @:
1085
1086 # Generate some files
1087 # ---------------------------------------------------------------------------
1088
1089 # KERNELRELEASE can change from a few different places, meaning version.h
1090 # needs to be updated, so this check is forced on all builds
1091
1092 uts_len := 64
1093 define filechk_utsrelease.h
1094         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1095           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1096           exit 1;                                                         \
1097         fi;                                                               \
1098         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1099 endef
1100
1101 define filechk_version.h
1102         (echo \#define LINUX_VERSION_CODE $(shell                         \
1103         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1104         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1105 endef
1106
1107 $(version_h): $(srctree)/Makefile FORCE
1108         $(call filechk,version.h)
1109         $(Q)rm -f $(old_version_h)
1110
1111 include/generated/utsrelease.h: include/config/kernel.release FORCE
1112         $(call filechk,utsrelease.h)
1113
1114 PHONY += headerdep
1115 headerdep:
1116         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1117         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1118
1119 # ---------------------------------------------------------------------------
1120 # Firmware install
1121 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1122 export INSTALL_FW_PATH
1123
1124 PHONY += firmware_install
1125 firmware_install:
1126         @mkdir -p $(objtree)/firmware
1127         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1128
1129 # ---------------------------------------------------------------------------
1130 # Kernel headers
1131
1132 #Default location for installed headers
1133 export INSTALL_HDR_PATH = $(objtree)/usr
1134
1135 # If we do an all arch process set dst to asm-$(hdr-arch)
1136 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1137
1138 PHONY += archheaders
1139 archheaders:
1140
1141 PHONY += archscripts
1142 archscripts:
1143
1144 PHONY += __headers
1145 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1146         $(Q)$(MAKE) $(build)=scripts build_unifdef
1147
1148 PHONY += headers_install_all
1149 headers_install_all:
1150         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1151
1152 PHONY += headers_install
1153 headers_install: __headers
1154         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1155           $(error Headers not exportable for the $(SRCARCH) architecture))
1156         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1157         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1158
1159 PHONY += headers_check_all
1160 headers_check_all: headers_install_all
1161         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1162
1163 PHONY += headers_check
1164 headers_check: headers_install
1165         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1166         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1167
1168 # ---------------------------------------------------------------------------
1169 # Kernel selftest
1170
1171 PHONY += kselftest
1172 kselftest:
1173         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1174
1175 kselftest-clean:
1176         $(Q)$(MAKE) -C tools/testing/selftests clean
1177
1178 PHONY += kselftest-merge
1179 kselftest-merge:
1180         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1181         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1182                 -m $(objtree)/.config \
1183                 $(srctree)/tools/testing/selftests/*/config
1184         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1185
1186 # ---------------------------------------------------------------------------
1187 # Modules
1188
1189 ifdef CONFIG_MODULES
1190
1191 # By default, build modules as well
1192
1193 all: modules
1194
1195 # Build modules
1196 #
1197 # A module can be listed more than once in obj-m resulting in
1198 # duplicate lines in modules.order files.  Those are removed
1199 # using awk while concatenating to the final file.
1200
1201 PHONY += modules
1202 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1203         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1204         @$(kecho) '  Building modules, stage 2.';
1205         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1206         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1207
1208 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1209         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1210
1211 %/modules.builtin: include/config/auto.conf
1212         $(Q)$(MAKE) $(modbuiltin)=$*
1213
1214
1215 # Target to prepare building external modules
1216 PHONY += modules_prepare
1217 modules_prepare: prepare scripts
1218
1219 # Target to install modules
1220 PHONY += modules_install
1221 modules_install: _modinst_ _modinst_post
1222
1223 PHONY += _modinst_
1224 _modinst_:
1225         @rm -rf $(MODLIB)/kernel
1226         @rm -f $(MODLIB)/source
1227         @mkdir -p $(MODLIB)/kernel
1228         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1229         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1230                 rm -f $(MODLIB)/build ; \
1231                 ln -s $(CURDIR) $(MODLIB)/build ; \
1232         fi
1233         @cp -f $(objtree)/modules.order $(MODLIB)/
1234         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1235         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1236
1237 # This depmod is only for convenience to give the initial
1238 # boot a modules.dep even before / is mounted read-write.  However the
1239 # boot script depmod is the master version.
1240 PHONY += _modinst_post
1241 _modinst_post: _modinst_
1242         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1243         $(call cmd,depmod)
1244
1245 ifeq ($(CONFIG_MODULE_SIG), y)
1246 PHONY += modules_sign
1247 modules_sign:
1248         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1249 endif
1250
1251 else # CONFIG_MODULES
1252
1253 # Modules not configured
1254 # ---------------------------------------------------------------------------
1255
1256 PHONY += modules modules_install
1257 modules modules_install:
1258         @echo >&2
1259         @echo >&2 "The present kernel configuration has modules disabled."
1260         @echo >&2 "Type 'make config' and enable loadable module support."
1261         @echo >&2 "Then build a kernel with module support enabled."
1262         @echo >&2
1263         @exit 1
1264
1265 endif # CONFIG_MODULES
1266
1267 ###
1268 # Cleaning is done on three levels.
1269 # make clean     Delete most generated files
1270 #                Leave enough to build external modules
1271 # make mrproper  Delete the current configuration, and all generated files
1272 # make distclean Remove editor backup files, patch leftover files and the like
1273
1274 # Directories & files removed with 'make clean'
1275 CLEAN_DIRS  += $(MODVERDIR)
1276
1277 # Directories & files removed with 'make mrproper'
1278 MRPROPER_DIRS  += include/config usr/include include/generated          \
1279                   arch/*/include/generated .tmp_objdiff
1280 MRPROPER_FILES += .config .config.old .version .old_version \
1281                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1282                   signing_key.pem signing_key.priv signing_key.x509     \
1283                   x509.genkey extra_certificates signing_key.x509.keyid \
1284                   signing_key.x509.signer vmlinux-gdb.py
1285
1286 # clean - Delete most, but leave enough to build external modules
1287 #
1288 clean: rm-dirs  := $(CLEAN_DIRS)
1289 clean: rm-files := $(CLEAN_FILES)
1290 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1291
1292 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1293 $(clean-dirs):
1294         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1295
1296 vmlinuxclean:
1297         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1298         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1299
1300 clean: archclean vmlinuxclean
1301
1302 # mrproper - Delete all generated files, including .config
1303 #
1304 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1305 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1306 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1307
1308 PHONY += $(mrproper-dirs) mrproper archmrproper
1309 $(mrproper-dirs):
1310         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1311
1312 mrproper: clean archmrproper $(mrproper-dirs)
1313         $(call cmd,rmdirs)
1314         $(call cmd,rmfiles)
1315
1316 # distclean
1317 #
1318 PHONY += distclean
1319
1320 distclean: mrproper
1321         @find $(srctree) $(RCS_FIND_IGNORE) \
1322                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1323                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1324                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1325                 -type f -print | xargs rm -f
1326
1327
1328 # Packaging of the kernel to various formats
1329 # ---------------------------------------------------------------------------
1330 # rpm target kept for backward compatibility
1331 package-dir     := scripts/package
1332
1333 %src-pkg: FORCE
1334         $(Q)$(MAKE) $(build)=$(package-dir) $@
1335 %pkg: include/config/kernel.release FORCE
1336         $(Q)$(MAKE) $(build)=$(package-dir) $@
1337 rpm: include/config/kernel.release FORCE
1338         $(Q)$(MAKE) $(build)=$(package-dir) $@
1339
1340
1341 # Brief documentation of the typical targets used
1342 # ---------------------------------------------------------------------------
1343
1344 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1345 boards := $(sort $(notdir $(boards)))
1346 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1347 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1348
1349 PHONY += help
1350 help:
1351         @echo  'Cleaning targets:'
1352         @echo  '  clean           - Remove most generated files but keep the config and'
1353         @echo  '                    enough build support to build external modules'
1354         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1355         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1356         @echo  ''
1357         @echo  'Configuration targets:'
1358         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1359         @echo  ''
1360         @echo  'Other generic targets:'
1361         @echo  '  all             - Build all targets marked with [*]'
1362         @echo  '* vmlinux         - Build the bare kernel'
1363         @echo  '* modules         - Build all modules'
1364         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1365         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1366         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1367         @echo  '  dir/            - Build all files in dir and below'
1368         @echo  '  dir/file.[ois]  - Build specified target only'
1369         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1370         @echo  '                    (requires a recent binutils and recent build (System.map))'
1371         @echo  '  dir/file.ko     - Build module including final link'
1372         @echo  '  modules_prepare - Set up for building external modules'
1373         @echo  '  tags/TAGS       - Generate tags file for editors'
1374         @echo  '  cscope          - Generate cscope index'
1375         @echo  '  gtags           - Generate GNU GLOBAL index'
1376         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1377         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1378         @echo  '  image_name      - Output the image name (use with make -s)'
1379         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1380          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1381          echo  ''
1382         @echo  'Static analysers'
1383         @echo  '  checkstack      - Generate a list of stack hogs'
1384         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1385         @echo  '  versioncheck    - Sanity check on version.h usage'
1386         @echo  '  includecheck    - Check for duplicate included header files'
1387         @echo  '  export_report   - List the usages of all exported symbols'
1388         @echo  '  headers_check   - Sanity check on exported headers'
1389         @echo  '  headerdep       - Detect inclusion cycles in headers'
1390         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1391         @echo  ''
1392         @echo  'Kernel selftest'
1393         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1394         @echo  '                    Build, install, and boot kernel before'
1395         @echo  '                    running kselftest on it'
1396         @echo  '  kselftest-clean - Remove all generated kselftest files'
1397         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1398         @echo  '                    .config.'
1399         @echo  ''
1400         @echo  'Kernel packaging:'
1401         @$(MAKE) $(build)=$(package-dir) help
1402         @echo  ''
1403         @echo  'Documentation targets:'
1404         @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1405         @echo  ''
1406         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1407         @echo  ''
1408         @echo  'Architecture specific targets ($(SRCARCH)):'
1409         @$(if $(archhelp),$(archhelp),\
1410                 echo '  No architecture specific help defined for $(SRCARCH)')
1411         @echo  ''
1412         @$(if $(boards), \
1413                 $(foreach b, $(boards), \
1414                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1415                 echo '')
1416         @$(if $(board-dirs), \
1417                 $(foreach b, $(board-dirs), \
1418                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1419                 printf "  %-16s - Show all of the above\\n" help-boards; \
1420                 echo '')
1421
1422         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1423         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1424         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1425         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1426         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1427         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1428         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1429         @echo  '                1: warnings which may be relevant and do not occur too often'
1430         @echo  '                2: warnings which occur quite often but may still be relevant'
1431         @echo  '                3: more obscure warnings, can most likely be ignored'
1432         @echo  '                Multiple levels can be combined with W=12 or W=123'
1433         @echo  ''
1434         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1435         @echo  'For further info see the ./README file'
1436
1437
1438 help-board-dirs := $(addprefix help-,$(board-dirs))
1439
1440 help-boards: $(help-board-dirs)
1441
1442 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1443
1444 $(help-board-dirs): help-%:
1445         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1446         @$(if $(boards-per-dir), \
1447                 $(foreach b, $(boards-per-dir), \
1448                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1449                 echo '')
1450
1451
1452 # Documentation targets
1453 # ---------------------------------------------------------------------------
1454 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1455 PHONY += $(DOC_TARGETS)
1456 $(DOC_TARGETS): scripts_basic FORCE
1457         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1458         $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1459         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1460
1461 else # KBUILD_EXTMOD
1462
1463 ###
1464 # External module support.
1465 # When building external modules the kernel used as basis is considered
1466 # read-only, and no consistency checks are made and the make
1467 # system is not used on the basis kernel. If updates are required
1468 # in the basis kernel ordinary make commands (without M=...) must
1469 # be used.
1470 #
1471 # The following are the only valid targets when building external
1472 # modules.
1473 # make M=dir clean     Delete all automatically generated files
1474 # make M=dir modules   Make all modules in specified dir
1475 # make M=dir           Same as 'make M=dir modules'
1476 # make M=dir modules_install
1477 #                      Install the modules built in the module directory
1478 #                      Assumes install directory is already created
1479
1480 # We are always building modules
1481 KBUILD_MODULES := 1
1482 PHONY += crmodverdir
1483 crmodverdir:
1484         $(cmd_crmodverdir)
1485
1486 PHONY += $(objtree)/Module.symvers
1487 $(objtree)/Module.symvers:
1488         @test -e $(objtree)/Module.symvers || ( \
1489         echo; \
1490         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1491         echo "           is missing; modules will have no dependencies and modversions."; \
1492         echo )
1493
1494 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1495 PHONY += $(module-dirs) modules
1496 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1497         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1498
1499 modules: $(module-dirs)
1500         @$(kecho) '  Building modules, stage 2.';
1501         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1502
1503 PHONY += modules_install
1504 modules_install: _emodinst_ _emodinst_post
1505
1506 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1507 PHONY += _emodinst_
1508 _emodinst_:
1509         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1510         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1511
1512 PHONY += _emodinst_post
1513 _emodinst_post: _emodinst_
1514         $(call cmd,depmod)
1515
1516 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1517
1518 PHONY += $(clean-dirs) clean
1519 $(clean-dirs):
1520         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1521
1522 clean:  rm-dirs := $(MODVERDIR)
1523 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1524
1525 PHONY += help
1526 help:
1527         @echo  '  Building external modules.'
1528         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1529         @echo  ''
1530         @echo  '  modules         - default target, build the module(s)'
1531         @echo  '  modules_install - install the module'
1532         @echo  '  clean           - remove generated files in module directory only'
1533         @echo  ''
1534
1535 # Dummies...
1536 PHONY += prepare scripts
1537 prepare: ;
1538 scripts: ;
1539 endif # KBUILD_EXTMOD
1540
1541 clean: $(clean-dirs)
1542         $(call cmd,rmdirs)
1543         $(call cmd,rmfiles)
1544         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1545                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1546                 -o -name '*.ko.*' \
1547                 -o -name '*.dwo'  \
1548                 -o -name '*.su'  \
1549                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1550                 -o -name '*.symtypes' -o -name 'modules.order' \
1551                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1552                 -o -name '*.c.[012]*.*' \
1553                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1554
1555 # Generate tags for editors
1556 # ---------------------------------------------------------------------------
1557 quiet_cmd_tags = GEN     $@
1558       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1559
1560 tags TAGS cscope gtags: FORCE
1561         $(call cmd,tags)
1562
1563 # Scripts to check various things for consistency
1564 # ---------------------------------------------------------------------------
1565
1566 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1567
1568 includecheck:
1569         find $(srctree)/* $(RCS_FIND_IGNORE) \
1570                 -name '*.[hcS]' -type f -print | sort \
1571                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1572
1573 versioncheck:
1574         find $(srctree)/* $(RCS_FIND_IGNORE) \
1575                 -name '*.[hcS]' -type f -print | sort \
1576                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1577
1578 coccicheck:
1579         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1580
1581 namespacecheck:
1582         $(PERL) $(srctree)/scripts/namespace.pl
1583
1584 export_report:
1585         $(PERL) $(srctree)/scripts/export_report.pl
1586
1587 endif #ifeq ($(config-targets),1)
1588 endif #ifeq ($(mixed-targets),1)
1589
1590 PHONY += checkstack kernelrelease kernelversion image_name
1591
1592 # UML needs a little special treatment here.  It wants to use the host
1593 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1594 # else wants $(ARCH), including people doing cross-builds, which means
1595 # that $(SUBARCH) doesn't work here.
1596 ifeq ($(ARCH), um)
1597 CHECKSTACK_ARCH := $(SUBARCH)
1598 else
1599 CHECKSTACK_ARCH := $(ARCH)
1600 endif
1601 checkstack:
1602         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1603         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1604
1605 kernelrelease:
1606         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1607
1608 kernelversion:
1609         @echo $(KERNELVERSION)
1610
1611 image_name:
1612         @echo $(KBUILD_IMAGE)
1613
1614 # Clear a bunch of variables before executing the submake
1615 tools/: FORCE
1616         $(Q)mkdir -p $(objtree)/tools
1617         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1618
1619 tools/%: FORCE
1620         $(Q)mkdir -p $(objtree)/tools
1621         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1622
1623 # Single targets
1624 # ---------------------------------------------------------------------------
1625 # Single targets are compatible with:
1626 # - build with mixed source and output
1627 # - build with separate output dir 'make O=...'
1628 # - external modules
1629 #
1630 #  target-dir => where to store outputfile
1631 #  build-dir  => directory in kernel source tree to use
1632
1633 ifeq ($(KBUILD_EXTMOD),)
1634         build-dir  = $(patsubst %/,%,$(dir $@))
1635         target-dir = $(dir $@)
1636 else
1637         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1638         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1639         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1640 endif
1641
1642 %.s: %.c prepare scripts FORCE
1643         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1644 %.i: %.c prepare scripts FORCE
1645         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1646 %.o: %.c prepare scripts FORCE
1647         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1648 %.lst: %.c prepare scripts FORCE
1649         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1650 %.s: %.S prepare scripts FORCE
1651         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1652 %.o: %.S prepare scripts FORCE
1653         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1654 %.symtypes: %.c prepare scripts FORCE
1655         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1656
1657 # Modules
1658 /: prepare scripts FORCE
1659         $(cmd_crmodverdir)
1660         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1661         $(build)=$(build-dir)
1662 # Make sure the latest headers are built for Documentation
1663 Documentation/ samples/: headers_install
1664 %/: prepare scripts FORCE
1665         $(cmd_crmodverdir)
1666         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1667         $(build)=$(build-dir)
1668 %.ko: prepare scripts FORCE
1669         $(cmd_crmodverdir)
1670         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1671         $(build)=$(build-dir) $(@:.ko=.o)
1672         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1673
1674 # FIXME Should go into a make.lib or something
1675 # ===========================================================================
1676
1677 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1678       cmd_rmdirs = rm -rf $(rm-dirs)
1679
1680 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1681       cmd_rmfiles = rm -f $(rm-files)
1682
1683 # Run depmod only if we have System.map and depmod is executable
1684 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1685       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1686                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1687
1688 # Create temporary dir for module support files
1689 # clean it up only when building all modules
1690 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1691                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1692
1693 # read all saved command lines
1694
1695 targets := $(wildcard $(sort $(targets)))
1696 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1697
1698 ifneq ($(cmd_files),)
1699   $(cmd_files): ;       # Do not try to update included dependency files
1700   include $(cmd_files)
1701 endif
1702
1703 endif   # skip-makefile
1704
1705 PHONY += FORCE
1706 FORCE:
1707
1708 # Declare the contents of the .PHONY variable as phony.  We keep that
1709 # information in a variable so we can use it in if_changed and friends.
1710 .PHONY: $(PHONY)