Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 15
   3 SUBLEVEL = 0
   4 EXTRAVERSION = -rc1
   5 NAME = Shuffling Zombie Juror
   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 # Do not:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoids hard-to-debug behaviour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # Avoid interference with shell env settings
  26 unexport GREP_OPTIONS
  27
  28 # We are using a recursive build, so we need to do a little thinking
  29 # to get the ordering right.
  30 #
  31 # Most importantly: sub-Makefiles should only ever modify files in
  32 # their own directory. If in some directory we have a dependency on
  33 # a file in another dir (which doesn't happen often, but it's often
  34 # unavoidable when linking the built-in.o targets which finally
  35 # turn into vmlinux), we will call a sub make in that other dir, and
  36 # after that we are sure that everything which is in that other dir
  37 # is now up to date.
  38 #
  39 # The only cases where we need to modify files which have global
  40 # effects are thus separated out and done before the recursive
  41 # descending is started. They are now explicitly listed as the
  42 # prepare rule.
  43
  44 # To put more focus on warnings, be less verbose as default
  45 # Use 'make V=1' to see the full commands
  46
  47 ifeq ("$(origin V)", "command line")
  48   KBUILD_VERBOSE = $(V)
  49 endif
  50 ifndef KBUILD_VERBOSE
  51   KBUILD_VERBOSE = 0
  52 endif
  53
  54 # Call a source code checker (by default, "sparse") as part of the
  55 # C compilation.
  56 #
  57 # Use 'make C=1' to enable checking of only re-compiled files.
  58 # Use 'make C=2' to enable checking of *all* source files, regardless
  59 # of whether they are re-compiled or not.
  60 #
  61 # See the file "Documentation/sparse.txt" for more details, including
  62 # where to get the "sparse" utility.
  63
  64 ifeq ("$(origin C)", "command line")
  65   KBUILD_CHECKSRC = $(C)
  66 endif
  67 ifndef KBUILD_CHECKSRC
  68   KBUILD_CHECKSRC = 0
  69 endif
  70
  71 # Use make M=dir to specify directory of external module to build
  72 # Old syntax make ... SUBDIRS=$PWD is still supported
  73 # Setting the environment variable KBUILD_EXTMOD take precedence
  74 ifdef SUBDIRS
  75   KBUILD_EXTMOD ?= $(SUBDIRS)
  76 endif
  77
  78 ifeq ("$(origin M)", "command line")
  79   KBUILD_EXTMOD := $(M)
  80 endif
  81
  82 # kbuild supports saving output files in a separate directory.
  83 # To locate output files in a separate directory two syntaxes are supported.
  84 # In both cases the working directory must be the root of the kernel src.
  85 # 1) O=
  86 # Use "make O=dir/to/store/output/files/"
  87 #
  88 # 2) Set KBUILD_OUTPUT
  89 # Set the environment variable KBUILD_OUTPUT to point to the directory
  90 # where the output files shall be placed.
  91 # export KBUILD_OUTPUT=dir/to/store/output/files/
  92 # make
  93 #
  94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  95 # variable.
  96
  97
  98 # KBUILD_SRC is set on invocation of make in OBJ directory
  99 # KBUILD_SRC is not intended to be used by the regular user (for now)
 100 ifeq ($(KBUILD_SRC),)
 101
 102 # OK, Make called in directory where kernel src resides
 103 # Do we want to locate output files in a separate directory?
 104 ifeq ("$(origin O)", "command line")
 105   KBUILD_OUTPUT := $(O)
 106 endif
 107
 108 # That's our default target when none is given on the command line
 109 PHONY := _all
 110 _all:
 111
 112 # Cancel implicit rules on top Makefile
 113 $(CURDIR)/Makefile Makefile: ;
 114
 115 ifneq ($(KBUILD_OUTPUT),)
 116 # Invoke a second make in the output directory, passing relevant variables
 117 # check that the output directory actually exists
 118 saved-output := $(KBUILD_OUTPUT)
 119 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 120                                                                 && /bin/pwd)
 121 $(if $(KBUILD_OUTPUT),, \
 122      $(error failed to create output directory "$(saved-output)"))
 123
 124 PHONY += $(MAKECMDGOALS) sub-make
 125
 126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 127         @:
 128
 129 sub-make: FORCE
 130         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 131         KBUILD_SRC=$(CURDIR) \
 132         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 133         $(filter-out _all sub-make,$(MAKECMDGOALS))
 134
 135 # Leave processing to above invocation of make
 136 skip-makefile := 1
 137 endif # ifneq ($(KBUILD_OUTPUT),)
 138 endif # ifeq ($(KBUILD_SRC),)
 139
 140 # We process the rest of the Makefile if this is the final invocation of make
 141 ifeq ($(skip-makefile),)
 142
 143 # If building an external module we do not care about the all: rule
 144 # but instead _all depend on modules
 145 PHONY += all
 146 ifeq ($(KBUILD_EXTMOD),)
 147 _all: all
 148 else
 149 _all: modules
 150 endif
 151
 152 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),.)
 153 objtree         := .
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH
 160
 161
 162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 163 # first, and if a usermode build is happening, the "ARCH=um" on the command
 164 # line overrides the setting of ARCH below.  If a native build is happening,
 165 # then ARCH is assigned, getting whatever value it gets normally, and
 166 # SUBARCH is subsequently ignored.
 167
 168 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 169                                   -e s/sun4u/sparc64/ \
 170                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 171                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 172                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 173                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 174
 175 # Cross compiling and selecting different set of gcc/bin-utils
 176 # ---------------------------------------------------------------------------
 177 #
 178 # When performing cross compilation for other architectures ARCH shall be set
 179 # to the target architecture. (See arch/* for the possibilities).
 180 # ARCH can be set during invocation of make:
 181 # make ARCH=ia64
 182 # Another way is to have ARCH set in the environment.
 183 # The default ARCH is the host where make is executed.
 184
 185 # CROSS_COMPILE specify the prefix used for all executables used
 186 # during compilation. Only gcc and related bin-utils executables
 187 # are prefixed with $(CROSS_COMPILE).
 188 # CROSS_COMPILE can be set on the command line
 189 # make CROSS_COMPILE=ia64-linux-
 190 # Alternatively CROSS_COMPILE can be set in the environment.
 191 # A third alternative is to store a setting in .config so that plain
 192 # "make" in the configured kernel build directory always uses that.
 193 # Default value for CROSS_COMPILE is not to prefix executables
 194 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 195 ARCH            ?= $(SUBARCH)
 196 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 197
 198 # Architecture as present in compile.h
 199 UTS_MACHINE     := $(ARCH)
 200 SRCARCH         := $(ARCH)
 201
 202 # Additional ARCH settings for x86
 203 ifeq ($(ARCH),i386)
 204         SRCARCH := x86
 205 endif
 206 ifeq ($(ARCH),x86_64)
 207         SRCARCH := x86
 208 endif
 209
 210 # Additional ARCH settings for sparc
 211 ifeq ($(ARCH),sparc32)
 212        SRCARCH := sparc
 213 endif
 214 ifeq ($(ARCH),sparc64)
 215        SRCARCH := sparc
 216 endif
 217
 218 # Additional ARCH settings for sh
 219 ifeq ($(ARCH),sh64)
 220        SRCARCH := sh
 221 endif
 222
 223 # Additional ARCH settings for tile
 224 ifeq ($(ARCH),tilepro)
 225        SRCARCH := tile
 226 endif
 227 ifeq ($(ARCH),tilegx)
 228        SRCARCH := tile
 229 endif
 230
 231 # Where to locate arch specific headers
 232 hdr-arch  := $(SRCARCH)
 233
 234 KCONFIG_CONFIG  ?= .config
 235 export KCONFIG_CONFIG
 236
 237 # SHELL used by kbuild
 238 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 239           else if [ -x /bin/bash ]; then echo /bin/bash; \
 240           else echo sh; fi ; fi)
 241
 242 HOSTCC       = gcc
 243 HOSTCXX      = g++
 244 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 245 HOSTCXXFLAGS = -O2
 246
 247 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 248 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 249                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 250 endif
 251
 252 # Decide whether to build built-in, modular, or both.
 253 # Normally, just do built-in.
 254
 255 KBUILD_MODULES :=
 256 KBUILD_BUILTIN := 1
 257
 258 # If we have only "make modules", don't compile built-in objects.
 259 # When we're building modules with modversions, we need to consider
 260 # the built-in objects during the descend as well, in order to
 261 # make sure the checksums are up to date before we record them.
 262
 263 ifeq ($(MAKECMDGOALS),modules)
 264   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 265 endif
 266
 267 # If we have "make <whatever> modules", compile modules
 268 # in addition to whatever we do anyway.
 269 # Just "make" or "make all" shall build modules as well
 270
 271 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 272   KBUILD_MODULES := 1
 273 endif
 274
 275 ifeq ($(MAKECMDGOALS),)
 276   KBUILD_MODULES := 1
 277 endif
 278
 279 export KBUILD_MODULES KBUILD_BUILTIN
 280 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 281
 282 # Beautify output
 283 # ---------------------------------------------------------------------------
 284 #
 285 # Normally, we echo the whole command before executing it. By making
 286 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 287 # $(quiet) to choose other forms of output instead, e.g.
 288 #
 289 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 290 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 291 #
 292 # If $(quiet) is empty, the whole command will be printed.
 293 # If it is set to "quiet_", only the short version will be printed.
 294 # If it is set to "silent_", nothing will be printed at all, since
 295 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 296 #
 297 # A simple variant is to prefix commands with $(Q) - that's useful
 298 # for commands that shall be hidden in non-verbose mode.
 299 #
 300 #       $(Q)ln $@ :<
 301 #
 302 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 303 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 304
 305 ifeq ($(KBUILD_VERBOSE),1)
 306   quiet =
 307   Q =
 308 else
 309   quiet=quiet_
 310   Q = @
 311 endif
 312
 313 # If the user is running make -s (silent mode), suppress echoing of
 314 # commands
 315
 316 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
 317 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
 318   quiet=silent_
 319 endif
 320 else                                    # make-3.8x
 321 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 322   quiet=silent_
 323 endif
 324 endif
 325
 326 export quiet Q KBUILD_VERBOSE
 327
 328 ifneq ($(CC),)
 329 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
 330 COMPILER := clang
 331 else
 332 COMPILER := gcc
 333 endif
 334 export COMPILER
 335 endif
 336
 337 # Look for make include files relative to root of kernel src
 338 MAKEFLAGS += --include-dir=$(srctree)
 339
 340 # We need some generic definitions (do not try to remake the file).
 341 $(srctree)/scripts/Kbuild.include: ;
 342 include $(srctree)/scripts/Kbuild.include
 343
 344 # Make variables (CC, etc...)
 345 AS              = $(CROSS_COMPILE)as
 346 LD              = $(CROSS_COMPILE)ld
 347 CC              = $(CROSS_COMPILE)gcc
 348 CPP             = $(CC) -E
 349 AR              = $(CROSS_COMPILE)ar
 350 NM              = $(CROSS_COMPILE)nm
 351 STRIP           = $(CROSS_COMPILE)strip
 352 OBJCOPY         = $(CROSS_COMPILE)objcopy
 353 OBJDUMP         = $(CROSS_COMPILE)objdump
 354 AWK             = awk
 355 GENKSYMS        = scripts/genksyms/genksyms
 356 INSTALLKERNEL  := installkernel
 357 DEPMOD          = /sbin/depmod
 358 PERL            = perl
 359 CHECK           = sparse
 360
 361 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 362                   -Wbitwise -Wno-return-void $(CF)
 363 CFLAGS_MODULE   =
 364 AFLAGS_MODULE   =
 365 LDFLAGS_MODULE  =
 366 CFLAGS_KERNEL   =
 367 AFLAGS_KERNEL   =
 368 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 369
 370
 371 # Use USERINCLUDE when you must reference the UAPI directories only.
 372 USERINCLUDE    := \
 373                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 374                 -Iarch/$(hdr-arch)/include/generated/uapi \
 375                 -I$(srctree)/include/uapi \
 376                 -Iinclude/generated/uapi \
 377                 -include $(srctree)/include/linux/kconfig.h
 378
 379 # Use LINUXINCLUDE when you must reference the include/ directory.
 380 # Needed to be compatible with the O= option
 381 LINUXINCLUDE    := \
 382                 -I$(srctree)/arch/$(hdr-arch)/include \
 383                 -Iarch/$(hdr-arch)/include/generated \
 384                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 385                 -Iinclude \
 386                 $(USERINCLUDE)
 387
 388 KBUILD_CPPFLAGS := -D__KERNEL__
 389
 390 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 391                    -fno-strict-aliasing -fno-common \
 392                    -Werror-implicit-function-declaration \
 393                    -Wno-format-security \
 394                    $(call cc-option,-fno-delete-null-pointer-checks,)
 395 KBUILD_AFLAGS_KERNEL :=
 396 KBUILD_CFLAGS_KERNEL :=
 397 KBUILD_AFLAGS   := -D__ASSEMBLY__
 398 KBUILD_AFLAGS_MODULE  := -DMODULE
 399 KBUILD_CFLAGS_MODULE  := -DMODULE
 400 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 401
 402 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 403 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 404 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 405
 406 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 407 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 408 export CPP AR NM STRIP OBJCOPY OBJDUMP
 409 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 410 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 411
 412 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 413 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 414 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 415 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 416 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 417 export KBUILD_ARFLAGS
 418
 419 # When compiling out-of-tree modules, put MODVERDIR in the module
 420 # tree rather than in the kernel tree. The kernel tree might
 421 # even be read-only.
 422 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 423
 424 # Files to ignore in find ... statements
 425
 426 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 427                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 428                           -prune -o
 429 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 430                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 431
 432 # ===========================================================================
 433 # Rules shared between *config targets and build targets
 434
 435 # Basic helpers built in scripts/
 436 PHONY += scripts_basic
 437 scripts_basic:
 438         $(Q)$(MAKE) $(build)=scripts/basic
 439         $(Q)rm -f .tmp_quiet_recordmcount
 440
 441 # To avoid any implicit rule to kick in, define an empty command.
 442 scripts/basic/%: scripts_basic ;
 443
 444 PHONY += outputmakefile
 445 # outputmakefile generates a Makefile in the output directory, if using a
 446 # separate output directory. This allows convenient use of make in the
 447 # output directory.
 448 outputmakefile:
 449 ifneq ($(KBUILD_SRC),)
 450         $(Q)ln -fsn $(srctree) source
 451         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 452             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 453 endif
 454
 455 # Support for using generic headers in asm-generic
 456 PHONY += asm-generic
 457 asm-generic:
 458         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 459                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 460         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 461                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 462
 463 # To make sure we do not include .config for any of the *config targets
 464 # catch them early, and hand them over to scripts/kconfig/Makefile
 465 # It is allowed to specify more targets when calling make, including
 466 # mixing *config targets and build targets.
 467 # For example 'make oldconfig all'.
 468 # Detect when mixed targets is specified, and make a second invocation
 469 # of make so .config is not included in this case either (for *config).
 470
 471 version_h := include/generated/uapi/linux/version.h
 472
 473 no-dot-config-targets := clean mrproper distclean \
 474                          cscope gtags TAGS tags help %docs check% coccicheck \
 475                          $(version_h) headers_% archheaders archscripts \
 476                          kernelversion %src-pkg
 477
 478 config-targets := 0
 479 mixed-targets  := 0
 480 dot-config     := 1
 481
 482 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 483         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 484                 dot-config := 0
 485         endif
 486 endif
 487
 488 ifeq ($(KBUILD_EXTMOD),)
 489         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 490                 config-targets := 1
 491                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 492                         mixed-targets := 1
 493                 endif
 494         endif
 495 endif
 496
 497 ifeq ($(mixed-targets),1)
 498 # ===========================================================================
 499 # We're called with mixed targets (*config and build targets).
 500 # Handle them one by one.
 501
 502 PHONY += $(MAKECMDGOALS) __build_one_by_one
 503
 504 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 505         @:
 506
 507 __build_one_by_one:
 508         $(Q)set -e; \
 509         for i in $(MAKECMDGOALS); do \
 510                 $(MAKE) -f $(srctree)/Makefile $$i; \
 511         done
 512
 513 else
 514 ifeq ($(config-targets),1)
 515 # ===========================================================================
 516 # *config targets only - make sure prerequisites are updated, and descend
 517 # in scripts/kconfig to make the *config target
 518
 519 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 520 # KBUILD_DEFCONFIG may point out an alternative default configuration
 521 # used for 'make defconfig'
 522 include $(srctree)/arch/$(SRCARCH)/Makefile
 523 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 524
 525 config: scripts_basic outputmakefile FORCE
 526         $(Q)mkdir -p include/linux include/config
 527         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 528
 529 %config: scripts_basic outputmakefile FORCE
 530         $(Q)mkdir -p include/linux include/config
 531         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 532
 533 else
 534 # ===========================================================================
 535 # Build targets only - this includes vmlinux, arch specific targets, clean
 536 # targets and others. In general all targets except *config targets.
 537
 538 ifeq ($(KBUILD_EXTMOD),)
 539 # Additional helpers built in scripts/
 540 # Carefully list dependencies so we do not try to build scripts twice
 541 # in parallel
 542 PHONY += scripts
 543 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 544          asm-generic
 545         $(Q)$(MAKE) $(build)=$(@)
 546
 547 # Objects we will link into vmlinux / subdirs we need to visit
 548 init-y          := init/
 549 drivers-y       := drivers/ sound/ firmware/
 550 net-y           := net/
 551 libs-y          := lib/
 552 core-y          := usr/
 553 endif # KBUILD_EXTMOD
 554
 555 ifeq ($(dot-config),1)
 556 # Read in config
 557 -include include/config/auto.conf
 558
 559 ifeq ($(KBUILD_EXTMOD),)
 560 # Read in dependencies to all Kconfig* files, make sure to run
 561 # oldconfig if changes are detected.
 562 -include include/config/auto.conf.cmd
 563
 564 # To avoid any implicit rule to kick in, define an empty command
 565 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 566
 567 # If .config is newer than include/config/auto.conf, someone tinkered
 568 # with it and forgot to run make oldconfig.
 569 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 570 # we execute the config step to be sure to catch updated Kconfig files
 571 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 572         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 573 else
 574 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 575 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 576 PHONY += include/config/auto.conf
 577
 578 include/config/auto.conf:
 579         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 580         echo >&2;                                                       \
 581         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 582         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 583         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 584         echo >&2 ;                                                      \
 585         /bin/false)
 586
 587 endif # KBUILD_EXTMOD
 588
 589 else
 590 # Dummy target needed, because used as prerequisite
 591 include/config/auto.conf: ;
 592 endif # $(dot-config)
 593
 594 # The all: target is the default when no target is given on the
 595 # command line.
 596 # This allow a user to issue only 'make' to build a kernel including modules
 597 # Defaults to vmlinux, but the arch makefile usually adds further targets
 598 all: vmlinux
 599
 600 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 601 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 602 else
 603 KBUILD_CFLAGS   += -O2
 604 endif
 605
 606 include $(srctree)/arch/$(SRCARCH)/Makefile
 607
 608 ifdef CONFIG_READABLE_ASM
 609 # Disable optimizations that make assembler listings hard to read.
 610 # reorder blocks reorders the control in the function
 611 # ipa clone creates specialized cloned functions
 612 # partial inlining inlines only parts of functions
 613 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 614                  $(call cc-option,-fno-ipa-cp-clone,) \
 615                  $(call cc-option,-fno-partial-inlining)
 616 endif
 617
 618 ifneq ($(CONFIG_FRAME_WARN),0)
 619 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 620 endif
 621
 622 # Handle stack protector mode.
 623 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 624   stackp-flag := -fstack-protector
 625   ifeq ($(call cc-option, $(stackp-flag)),)
 626     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 627              -fstack-protector not supported by compiler)
 628   endif
 629 else
 630 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 631   stackp-flag := -fstack-protector-strong
 632   ifeq ($(call cc-option, $(stackp-flag)),)
 633     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 634               -fstack-protector-strong not supported by compiler)
 635   endif
 636 else
 637   # Force off for distro compilers that enable stack protector by default.
 638   stackp-flag := $(call cc-option, -fno-stack-protector)
 639 endif
 640 endif
 641 KBUILD_CFLAGS += $(stackp-flag)
 642
 643 ifeq ($(COMPILER),clang)
 644 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 645 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 646 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 647 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 648 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 649 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 650 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 651 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 652 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 653 # See modpost pattern 2
 654 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 655 else
 656
 657 # This warning generated too much noise in a regular build.
 658 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 659 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 660 endif
 661
 662 ifdef CONFIG_FRAME_POINTER
 663 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 664 else
 665 # Some targets (ARM with Thumb2, for example), can't be built with frame
 666 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 667 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 668 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 669 # -fomit-frame-pointer with FUNCTION_TRACER.
 670 ifndef CONFIG_FUNCTION_TRACER
 671 KBUILD_CFLAGS   += -fomit-frame-pointer
 672 endif
 673 endif
 674
 675 ifdef CONFIG_DEBUG_INFO
 676 KBUILD_CFLAGS   += -g
 677 KBUILD_AFLAGS   += -Wa,--gdwarf-2
 678 endif
 679
 680 ifdef CONFIG_DEBUG_INFO_REDUCED
 681 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 682                    $(call cc-option,-fno-var-tracking)
 683 endif
 684
 685 ifdef CONFIG_FUNCTION_TRACER
 686 ifdef CONFIG_HAVE_FENTRY
 687 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 688 endif
 689 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 690 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 691 ifdef CONFIG_DYNAMIC_FTRACE
 692         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 693                 BUILD_C_RECORDMCOUNT := y
 694                 export BUILD_C_RECORDMCOUNT
 695         endif
 696 endif
 697 endif
 698
 699 # We trigger additional mismatches with less inlining
 700 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 701 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 702 endif
 703
 704 # arch Makefile may override CC so keep this after arch Makefile is included
 705 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 706 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 707
 708 # warn about C99 declaration after statement
 709 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 710
 711 # disable pointer signed / unsigned warnings in gcc 4.0
 712 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 713
 714 # disable invalid "can't wrap" optimizations for signed / pointers
 715 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 716
 717 # conserve stack if available
 718 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 719
 720 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 721 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 722
 723 # require functions to have arguments in prototypes, not empty 'int foo()'
 724 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 725
 726 # Prohibit date/time macros, which would make the build non-deterministic
 727 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 728
 729 # use the deterministic mode of AR if available
 730 KBUILD_ARFLAGS := $(call ar-option,D)
 731
 732 # check for 'asm goto'
 733 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 734         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 735 endif
 736
 737 include $(srctree)/scripts/Makefile.extrawarn
 738
 739 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 740 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 741 KBUILD_AFLAGS += $(KAFLAGS)
 742 KBUILD_CFLAGS += $(KCFLAGS)
 743
 744 # Use --build-id when available.
 745 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 746                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 747 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 748 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 749
 750 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 751 LDFLAGS_vmlinux += $(call ld-option, -X,)
 752 endif
 753
 754 # Default kernel image to build when no specific target is given.
 755 # KBUILD_IMAGE may be overruled on the command line or
 756 # set in the environment
 757 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 758 # this default value
 759 export KBUILD_IMAGE ?= vmlinux
 760
 761 #
 762 # INSTALL_PATH specifies where to place the updated kernel and system map
 763 # images. Default is /boot, but you can set it to other values
 764 export  INSTALL_PATH ?= /boot
 765
 766 #
 767 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 768 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 769 # an argument if needed. Otherwise it defaults to the kernel install path
 770 #
 771 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 772
 773 #
 774 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 775 # relocations required by build roots.  This is not defined in the
 776 # makefile but the argument can be passed to make if needed.
 777 #
 778
 779 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 780 export MODLIB
 781
 782 #
 783 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 784 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 785 # the default option --strip-debug will be used.  Otherwise,
 786 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 787
 788 ifdef INSTALL_MOD_STRIP
 789 ifeq ($(INSTALL_MOD_STRIP),1)
 790 mod_strip_cmd = $(STRIP) --strip-debug
 791 else
 792 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 793 endif # INSTALL_MOD_STRIP=1
 794 else
 795 mod_strip_cmd = true
 796 endif # INSTALL_MOD_STRIP
 797 export mod_strip_cmd
 798
 799 # Select initial ramdisk compression format, default is gzip(1).
 800 # This shall be used by the dracut(8) tool while creating an initramfs image.
 801 #
 802 INITRD_COMPRESS-y                  := gzip
 803 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 804 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 805 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 806 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 807 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 808 # do not export INITRD_COMPRESS, since we didn't actually
 809 # choose a sane default compression above.
 810 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 811
 812 ifdef CONFIG_MODULE_SIG_ALL
 813 MODSECKEY = ./signing_key.priv
 814 MODPUBKEY = ./signing_key.x509
 815 export MODPUBKEY
 816 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 817 else
 818 mod_sign_cmd = true
 819 endif
 820 export mod_sign_cmd
 821
 822
 823 ifeq ($(KBUILD_EXTMOD),)
 824 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 825
 826 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 827                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 828                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 829
 830 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 831                      $(init-n) $(init-) \
 832                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 833                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 834
 835 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 836 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 837 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 838 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 839 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 840 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 841 libs-y          := $(libs-y1) $(libs-y2)
 842
 843 # Externally visible symbols (used by link-vmlinux.sh)
 844 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 845 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 846 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 847 export LDFLAGS_vmlinux
 848 # used by scripts/pacmage/Makefile
 849 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 850
 851 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 852
 853 # Final link of vmlinux
 854       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 855 quiet_cmd_link-vmlinux = LINK    $@
 856
 857 # Include targets which we want to
 858 # execute if the rest of the kernel build went well.
 859 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 860 ifdef CONFIG_HEADERS_CHECK
 861         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 862 endif
 863 ifdef CONFIG_SAMPLES
 864         $(Q)$(MAKE) $(build)=samples
 865 endif
 866 ifdef CONFIG_BUILD_DOCSRC
 867         $(Q)$(MAKE) $(build)=Documentation
 868 endif
 869         +$(call if_changed,link-vmlinux)
 870
 871 # The actual objects are generated when descending,
 872 # make sure no implicit rule kicks in
 873 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 874
 875 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 876 # Preset locale variables to speed up the build process. Limit locale
 877 # tweaks to this spot to avoid wrong language settings when running
 878 # make menuconfig etc.
 879 # Error messages still appears in the original language
 880
 881 PHONY += $(vmlinux-dirs)
 882 $(vmlinux-dirs): prepare scripts
 883         $(Q)$(MAKE) $(build)=$@
 884
 885 define filechk_kernel.release
 886         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 887 endef
 888
 889 # Store (new) KERNELRELEASE string in include/config/kernel.release
 890 include/config/kernel.release: include/config/auto.conf FORCE
 891         $(call filechk,kernel.release)
 892
 893
 894 # Things we need to do before we recursively start building the kernel
 895 # or the modules are listed in "prepare".
 896 # A multi level approach is used. prepareN is processed before prepareN-1.
 897 # archprepare is used in arch Makefiles and when processed asm symlink,
 898 # version.h and scripts_basic is processed / created.
 899
 900 # Listed in dependency order
 901 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 902
 903 # prepare3 is used to check if we are building in a separate output directory,
 904 # and if so do:
 905 # 1) Check that make has not been executed in the kernel src $(srctree)
 906 prepare3: include/config/kernel.release
 907 ifneq ($(KBUILD_SRC),)
 908         @$(kecho) '  Using $(srctree) as source for kernel'
 909         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 910                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 911                 echo >&2 "  in the '$(srctree)' directory.";\
 912                 /bin/false; \
 913         fi;
 914 endif
 915
 916 # prepare2 creates a makefile if using a separate output directory
 917 prepare2: prepare3 outputmakefile asm-generic
 918
 919 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 920                    include/config/auto.conf
 921         $(cmd_crmodverdir)
 922
 923 archprepare: archheaders archscripts prepare1 scripts_basic
 924
 925 prepare0: archprepare FORCE
 926         $(Q)$(MAKE) $(build)=.
 927
 928 # All the preparing..
 929 prepare: prepare0
 930
 931 # Generate some files
 932 # ---------------------------------------------------------------------------
 933
 934 # KERNELRELEASE can change from a few different places, meaning version.h
 935 # needs to be updated, so this check is forced on all builds
 936
 937 uts_len := 64
 938 define filechk_utsrelease.h
 939         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 940           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 941           exit 1;                                                         \
 942         fi;                                                               \
 943         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 944 endef
 945
 946 define filechk_version.h
 947         (echo \#define LINUX_VERSION_CODE $(shell                         \
 948         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 949         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 950 endef
 951
 952 $(version_h): $(srctree)/Makefile FORCE
 953         $(call filechk,version.h)
 954
 955 include/generated/utsrelease.h: include/config/kernel.release FORCE
 956         $(call filechk,utsrelease.h)
 957
 958 PHONY += headerdep
 959 headerdep:
 960         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 961         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 962
 963 # ---------------------------------------------------------------------------
 964
 965 PHONY += depend dep
 966 depend dep:
 967         @echo '*** Warning: make $@ is unnecessary now.'
 968
 969 # ---------------------------------------------------------------------------
 970 # Firmware install
 971 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 972 export INSTALL_FW_PATH
 973
 974 PHONY += firmware_install
 975 firmware_install: FORCE
 976         @mkdir -p $(objtree)/firmware
 977         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 978
 979 # ---------------------------------------------------------------------------
 980 # Kernel headers
 981
 982 #Default location for installed headers
 983 export INSTALL_HDR_PATH = $(objtree)/usr
 984
 985 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 986
 987 # If we do an all arch process set dst to asm-$(hdr-arch)
 988 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 989
 990 PHONY += archheaders
 991 archheaders:
 992
 993 PHONY += archscripts
 994 archscripts:
 995
 996 PHONY += __headers
 997 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
 998         $(Q)$(MAKE) $(build)=scripts build_unifdef
 999
1000 PHONY += headers_install_all
1001 headers_install_all:
1002         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1003
1004 PHONY += headers_install
1005 headers_install: __headers
1006         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1007           $(error Headers not exportable for the $(SRCARCH) architecture))
1008         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1009         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1010
1011 PHONY += headers_check_all
1012 headers_check_all: headers_install_all
1013         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1014
1015 PHONY += headers_check
1016 headers_check: headers_install
1017         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1018         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1019
1020 # ---------------------------------------------------------------------------
1021 # Modules
1022
1023 ifdef CONFIG_MODULES
1024
1025 # By default, build modules as well
1026
1027 all: modules
1028
1029 # Build modules
1030 #
1031 # A module can be listed more than once in obj-m resulting in
1032 # duplicate lines in modules.order files.  Those are removed
1033 # using awk while concatenating to the final file.
1034
1035 PHONY += modules
1036 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1037         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1038         @$(kecho) '  Building modules, stage 2.';
1039         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1040         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1041
1042 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1043         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1044
1045 %/modules.builtin: include/config/auto.conf
1046         $(Q)$(MAKE) $(modbuiltin)=$*
1047
1048
1049 # Target to prepare building external modules
1050 PHONY += modules_prepare
1051 modules_prepare: prepare scripts
1052
1053 # Target to install modules
1054 PHONY += modules_install
1055 modules_install: _modinst_ _modinst_post
1056
1057 PHONY += _modinst_
1058 _modinst_:
1059         @rm -rf $(MODLIB)/kernel
1060         @rm -f $(MODLIB)/source
1061         @mkdir -p $(MODLIB)/kernel
1062         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1063         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1064                 rm -f $(MODLIB)/build ; \
1065                 ln -s $(CURDIR) $(MODLIB)/build ; \
1066         fi
1067         @cp -f $(objtree)/modules.order $(MODLIB)/
1068         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1069         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1070
1071 # This depmod is only for convenience to give the initial
1072 # boot a modules.dep even before / is mounted read-write.  However the
1073 # boot script depmod is the master version.
1074 PHONY += _modinst_post
1075 _modinst_post: _modinst_
1076         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1077         $(call cmd,depmod)
1078
1079 ifeq ($(CONFIG_MODULE_SIG), y)
1080 PHONY += modules_sign
1081 modules_sign:
1082         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1083 endif
1084
1085 else # CONFIG_MODULES
1086
1087 # Modules not configured
1088 # ---------------------------------------------------------------------------
1089
1090 modules modules_install: FORCE
1091         @echo >&2
1092         @echo >&2 "The present kernel configuration has modules disabled."
1093         @echo >&2 "Type 'make config' and enable loadable module support."
1094         @echo >&2 "Then build a kernel with module support enabled."
1095         @echo >&2
1096         @exit 1
1097
1098 endif # CONFIG_MODULES
1099
1100 ###
1101 # Cleaning is done on three levels.
1102 # make clean     Delete most generated files
1103 #                Leave enough to build external modules
1104 # make mrproper  Delete the current configuration, and all generated files
1105 # make distclean Remove editor backup files, patch leftover files and the like
1106
1107 # Directories & files removed with 'make clean'
1108 CLEAN_DIRS  += $(MODVERDIR)
1109
1110 # Directories & files removed with 'make mrproper'
1111 MRPROPER_DIRS  += include/config usr/include include/generated          \
1112                   arch/*/include/generated .tmp_objdiff
1113 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1114                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1115                   signing_key.priv signing_key.x509 x509.genkey         \
1116                   extra_certificates signing_key.x509.keyid             \
1117                   signing_key.x509.signer include/linux/version.h
1118
1119 # clean - Delete most, but leave enough to build external modules
1120 #
1121 clean: rm-dirs  := $(CLEAN_DIRS)
1122 clean: rm-files := $(CLEAN_FILES)
1123 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1124
1125 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1126 $(clean-dirs):
1127         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1128
1129 vmlinuxclean:
1130         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1131
1132 clean: archclean vmlinuxclean
1133
1134 # mrproper - Delete all generated files, including .config
1135 #
1136 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1137 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1138 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1139
1140 PHONY += $(mrproper-dirs) mrproper archmrproper
1141 $(mrproper-dirs):
1142         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1143
1144 mrproper: clean archmrproper $(mrproper-dirs)
1145         $(call cmd,rmdirs)
1146         $(call cmd,rmfiles)
1147
1148 # distclean
1149 #
1150 PHONY += distclean
1151
1152 distclean: mrproper
1153         @find $(srctree) $(RCS_FIND_IGNORE) \
1154                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1155                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1156                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1157                 -type f -print | xargs rm -f
1158
1159
1160 # Packaging of the kernel to various formats
1161 # ---------------------------------------------------------------------------
1162 # rpm target kept for backward compatibility
1163 package-dir     := $(srctree)/scripts/package
1164
1165 %src-pkg: FORCE
1166         $(Q)$(MAKE) $(build)=$(package-dir) $@
1167 %pkg: include/config/kernel.release FORCE
1168         $(Q)$(MAKE) $(build)=$(package-dir) $@
1169 rpm: include/config/kernel.release FORCE
1170         $(Q)$(MAKE) $(build)=$(package-dir) $@
1171
1172
1173 # Brief documentation of the typical targets used
1174 # ---------------------------------------------------------------------------
1175
1176 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1177 boards := $(notdir $(boards))
1178 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1179 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1180
1181 help:
1182         @echo  'Cleaning targets:'
1183         @echo  '  clean           - Remove most generated files but keep the config and'
1184         @echo  '                    enough build support to build external modules'
1185         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1186         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1187         @echo  ''
1188         @echo  'Configuration targets:'
1189         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1190         @echo  ''
1191         @echo  'Other generic targets:'
1192         @echo  '  all             - Build all targets marked with [*]'
1193         @echo  '* vmlinux         - Build the bare kernel'
1194         @echo  '* modules         - Build all modules'
1195         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1196         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1197         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1198         @echo  '  dir/            - Build all files in dir and below'
1199         @echo  '  dir/file.[oisS] - Build specified target only'
1200         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1201         @echo  '                    (requires a recent binutils and recent build (System.map))'
1202         @echo  '  dir/file.ko     - Build module including final link'
1203         @echo  '  modules_prepare - Set up for building external modules'
1204         @echo  '  tags/TAGS       - Generate tags file for editors'
1205         @echo  '  cscope          - Generate cscope index'
1206         @echo  '  gtags           - Generate GNU GLOBAL index'
1207         @echo  '  kernelrelease   - Output the release version string'
1208         @echo  '  kernelversion   - Output the version stored in Makefile'
1209         @echo  '  image_name      - Output the image name'
1210         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1211          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1212          echo  ''
1213         @echo  'Static analysers'
1214         @echo  '  checkstack      - Generate a list of stack hogs'
1215         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1216         @echo  '  versioncheck    - Sanity check on version.h usage'
1217         @echo  '  includecheck    - Check for duplicate included header files'
1218         @echo  '  export_report   - List the usages of all exported symbols'
1219         @echo  '  headers_check   - Sanity check on exported headers'
1220         @echo  '  headerdep       - Detect inclusion cycles in headers'
1221         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1222         @echo  ''
1223         @echo  'Kernel packaging:'
1224         @$(MAKE) $(build)=$(package-dir) help
1225         @echo  ''
1226         @echo  'Documentation targets:'
1227         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1228         @echo  ''
1229         @echo  'Architecture specific targets ($(SRCARCH)):'
1230         @$(if $(archhelp),$(archhelp),\
1231                 echo '  No architecture specific help defined for $(SRCARCH)')
1232         @echo  ''
1233         @$(if $(boards), \
1234                 $(foreach b, $(boards), \
1235                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1236                 echo '')
1237         @$(if $(board-dirs), \
1238                 $(foreach b, $(board-dirs), \
1239                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1240                 printf "  %-16s - Show all of the above\\n" help-boards; \
1241                 echo '')
1242
1243         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1244         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1245         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1246         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1247         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1248         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1249         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1250         @echo  '                1: warnings which may be relevant and do not occur too often'
1251         @echo  '                2: warnings which occur quite often but may still be relevant'
1252         @echo  '                3: more obscure warnings, can most likely be ignored'
1253         @echo  '                Multiple levels can be combined with W=12 or W=123'
1254         @echo  ''
1255         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1256         @echo  'For further info see the ./README file'
1257
1258
1259 help-board-dirs := $(addprefix help-,$(board-dirs))
1260
1261 help-boards: $(help-board-dirs)
1262
1263 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1264
1265 $(help-board-dirs): help-%:
1266         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1267         @$(if $(boards-per-dir), \
1268                 $(foreach b, $(boards-per-dir), \
1269                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1270                 echo '')
1271
1272
1273 # Documentation targets
1274 # ---------------------------------------------------------------------------
1275 %docs: scripts_basic FORCE
1276         $(Q)$(MAKE) $(build)=scripts build_docproc
1277         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1278
1279 else # KBUILD_EXTMOD
1280
1281 ###
1282 # External module support.
1283 # When building external modules the kernel used as basis is considered
1284 # read-only, and no consistency checks are made and the make
1285 # system is not used on the basis kernel. If updates are required
1286 # in the basis kernel ordinary make commands (without M=...) must
1287 # be used.
1288 #
1289 # The following are the only valid targets when building external
1290 # modules.
1291 # make M=dir clean     Delete all automatically generated files
1292 # make M=dir modules   Make all modules in specified dir
1293 # make M=dir           Same as 'make M=dir modules'
1294 # make M=dir modules_install
1295 #                      Install the modules built in the module directory
1296 #                      Assumes install directory is already created
1297
1298 # We are always building modules
1299 KBUILD_MODULES := 1
1300 PHONY += crmodverdir
1301 crmodverdir:
1302         $(cmd_crmodverdir)
1303
1304 PHONY += $(objtree)/Module.symvers
1305 $(objtree)/Module.symvers:
1306         @test -e $(objtree)/Module.symvers || ( \
1307         echo; \
1308         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1309         echo "           is missing; modules will have no dependencies and modversions."; \
1310         echo )
1311
1312 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1313 PHONY += $(module-dirs) modules
1314 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1315         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1316
1317 modules: $(module-dirs)
1318         @$(kecho) '  Building modules, stage 2.';
1319         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1320
1321 PHONY += modules_install
1322 modules_install: _emodinst_ _emodinst_post
1323
1324 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1325 PHONY += _emodinst_
1326 _emodinst_:
1327         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1328         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1329
1330 PHONY += _emodinst_post
1331 _emodinst_post: _emodinst_
1332         $(call cmd,depmod)
1333
1334 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1335
1336 PHONY += $(clean-dirs) clean
1337 $(clean-dirs):
1338         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1339
1340 clean:  rm-dirs := $(MODVERDIR)
1341 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1342
1343 help:
1344         @echo  '  Building external modules.'
1345         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1346         @echo  ''
1347         @echo  '  modules         - default target, build the module(s)'
1348         @echo  '  modules_install - install the module'
1349         @echo  '  clean           - remove generated files in module directory only'
1350         @echo  ''
1351
1352 # Dummies...
1353 PHONY += prepare scripts
1354 prepare: ;
1355 scripts: ;
1356 endif # KBUILD_EXTMOD
1357
1358 clean: $(clean-dirs)
1359         $(call cmd,rmdirs)
1360         $(call cmd,rmfiles)
1361         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1362                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1363                 -o -name '*.ko.*' \
1364                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1365                 -o -name '*.symtypes' -o -name 'modules.order' \
1366                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1367                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1368
1369 # Generate tags for editors
1370 # ---------------------------------------------------------------------------
1371 quiet_cmd_tags = GEN     $@
1372       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1373
1374 tags TAGS cscope gtags: FORCE
1375         $(call cmd,tags)
1376
1377 # Scripts to check various things for consistency
1378 # ---------------------------------------------------------------------------
1379
1380 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1381
1382 includecheck:
1383         find $(srctree)/* $(RCS_FIND_IGNORE) \
1384                 -name '*.[hcS]' -type f -print | sort \
1385                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1386
1387 versioncheck:
1388         find $(srctree)/* $(RCS_FIND_IGNORE) \
1389                 -name '*.[hcS]' -type f -print | sort \
1390                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1391
1392 coccicheck:
1393         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1394
1395 namespacecheck:
1396         $(PERL) $(srctree)/scripts/namespace.pl
1397
1398 export_report:
1399         $(PERL) $(srctree)/scripts/export_report.pl
1400
1401 endif #ifeq ($(config-targets),1)
1402 endif #ifeq ($(mixed-targets),1)
1403
1404 PHONY += checkstack kernelrelease kernelversion image_name
1405
1406 # UML needs a little special treatment here.  It wants to use the host
1407 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1408 # else wants $(ARCH), including people doing cross-builds, which means
1409 # that $(SUBARCH) doesn't work here.
1410 ifeq ($(ARCH), um)
1411 CHECKSTACK_ARCH := $(SUBARCH)
1412 else
1413 CHECKSTACK_ARCH := $(ARCH)
1414 endif
1415 checkstack:
1416         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1417         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1418
1419 kernelrelease:
1420         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1421
1422 kernelversion:
1423         @echo $(KERNELVERSION)
1424
1425 image_name:
1426         @echo $(KBUILD_IMAGE)
1427
1428 # Clear a bunch of variables before executing the submake
1429 tools/: FORCE
1430         $(Q)mkdir -p $(objtree)/tools
1431         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1432
1433 tools/%: FORCE
1434         $(Q)mkdir -p $(objtree)/tools
1435         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1436
1437 # Single targets
1438 # ---------------------------------------------------------------------------
1439 # Single targets are compatible with:
1440 # - build with mixed source and output
1441 # - build with separate output dir 'make O=...'
1442 # - external modules
1443 #
1444 #  target-dir => where to store outputfile
1445 #  build-dir  => directory in kernel source tree to use
1446
1447 ifeq ($(KBUILD_EXTMOD),)
1448         build-dir  = $(patsubst %/,%,$(dir $@))
1449         target-dir = $(dir $@)
1450 else
1451         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1452         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1453         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1454 endif
1455
1456 %.s: %.c prepare scripts FORCE
1457         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1458 %.i: %.c prepare scripts FORCE
1459         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1460 %.o: %.c prepare scripts FORCE
1461         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1462 %.lst: %.c prepare scripts FORCE
1463         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1464 %.s: %.S prepare scripts FORCE
1465         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1466 %.o: %.S prepare scripts FORCE
1467         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1468 %.symtypes: %.c prepare scripts FORCE
1469         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1470
1471 # Modules
1472 /: prepare scripts FORCE
1473         $(cmd_crmodverdir)
1474         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1475         $(build)=$(build-dir)
1476 %/: prepare scripts FORCE
1477         $(cmd_crmodverdir)
1478         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1479         $(build)=$(build-dir)
1480 %.ko: prepare scripts FORCE
1481         $(cmd_crmodverdir)
1482         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1483         $(build)=$(build-dir) $(@:.ko=.o)
1484         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1485
1486 # FIXME Should go into a make.lib or something
1487 # ===========================================================================
1488
1489 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1490       cmd_rmdirs = rm -rf $(rm-dirs)
1491
1492 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1493       cmd_rmfiles = rm -f $(rm-files)
1494
1495 # Run depmod only if we have System.map and depmod is executable
1496 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1497       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1498                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1499
1500 # Create temporary dir for module support files
1501 # clean it up only when building all modules
1502 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1503                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1504
1505 # read all saved command lines
1506
1507 targets := $(wildcard $(sort $(targets)))
1508 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1509
1510 ifneq ($(cmd_files),)
1511   $(cmd_files): ;       # Do not try to update included dependency files
1512   include $(cmd_files)
1513 endif
1514
1515 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1516 # Usage:
1517 # $(Q)$(MAKE) $(clean)=dir
1518 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1519
1520 endif   # skip-makefile
1521
1522 PHONY += FORCE
1523 FORCE:
1524
1525 # Declare the contents of the .PHONY variable as phony.  We keep that
1526 # information in a variable so we can use it in if_changed and friends.
1527 .PHONY: $(PHONY)