Makefile

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