Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 16
   3 SUBLEVEL = 0
   4 EXTRAVERSION = -rc4
   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, $(MAKECMDGOALS)) _all: sub-make
 127         @:
 128
 129 # Fake the "Entering directory" message once, so that IDEs/editors are
 130 # able to understand relative filenames.
 131 sub-make: FORCE
 132         @echo "make[1]: Entering directory \`$(KBUILD_OUTPUT)'"
 133         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 134         KBUILD_SRC=$(CURDIR) \
 135         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 136         $(filter-out _all sub-make,$(MAKECMDGOALS))
 137
 138 # Leave processing to above invocation of make
 139 skip-makefile := 1
 140 endif # ifneq ($(KBUILD_OUTPUT),)
 141 endif # ifeq ($(KBUILD_SRC),)
 142
 143 # We process the rest of the Makefile if this is the final invocation of make
 144 ifeq ($(skip-makefile),)
 145
 146 # If building an external module we do not care about the all: rule
 147 # but instead _all depend on modules
 148 PHONY += all
 149 ifeq ($(KBUILD_EXTMOD),)
 150 _all: all
 151 else
 152 _all: modules
 153 endif
 154
 155 ifeq ($(KBUILD_SRC),)
 156         # building in the source tree
 157         srctree := .
 158 else
 159         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 160                 # building in a subdirectory of the source tree
 161                 srctree := ..
 162         else
 163                 srctree := $(KBUILD_SRC)
 164         endif
 165 endif
 166 objtree         := .
 167 src             := $(srctree)
 168 obj             := $(objtree)
 169
 170 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 171
 172 export srctree objtree VPATH
 173
 174
 175 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 176 # first, and if a usermode build is happening, the "ARCH=um" on the command
 177 # line overrides the setting of ARCH below.  If a native build is happening,
 178 # then ARCH is assigned, getting whatever value it gets normally, and
 179 # SUBARCH is subsequently ignored.
 180
 181 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 182                                   -e s/sun4u/sparc64/ \
 183                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 184                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 185                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 186                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 187
 188 # Cross compiling and selecting different set of gcc/bin-utils
 189 # ---------------------------------------------------------------------------
 190 #
 191 # When performing cross compilation for other architectures ARCH shall be set
 192 # to the target architecture. (See arch/* for the possibilities).
 193 # ARCH can be set during invocation of make:
 194 # make ARCH=ia64
 195 # Another way is to have ARCH set in the environment.
 196 # The default ARCH is the host where make is executed.
 197
 198 # CROSS_COMPILE specify the prefix used for all executables used
 199 # during compilation. Only gcc and related bin-utils executables
 200 # are prefixed with $(CROSS_COMPILE).
 201 # CROSS_COMPILE can be set on the command line
 202 # make CROSS_COMPILE=ia64-linux-
 203 # Alternatively CROSS_COMPILE can be set in the environment.
 204 # A third alternative is to store a setting in .config so that plain
 205 # "make" in the configured kernel build directory always uses that.
 206 # Default value for CROSS_COMPILE is not to prefix executables
 207 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 208 ARCH            ?= $(SUBARCH)
 209 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 210
 211 # Architecture as present in compile.h
 212 UTS_MACHINE     := $(ARCH)
 213 SRCARCH         := $(ARCH)
 214
 215 # Additional ARCH settings for x86
 216 ifeq ($(ARCH),i386)
 217         SRCARCH := x86
 218 endif
 219 ifeq ($(ARCH),x86_64)
 220         SRCARCH := x86
 221 endif
 222
 223 # Additional ARCH settings for sparc
 224 ifeq ($(ARCH),sparc32)
 225        SRCARCH := sparc
 226 endif
 227 ifeq ($(ARCH),sparc64)
 228        SRCARCH := sparc
 229 endif
 230
 231 # Additional ARCH settings for sh
 232 ifeq ($(ARCH),sh64)
 233        SRCARCH := sh
 234 endif
 235
 236 # Additional ARCH settings for tile
 237 ifeq ($(ARCH),tilepro)
 238        SRCARCH := tile
 239 endif
 240 ifeq ($(ARCH),tilegx)
 241        SRCARCH := tile
 242 endif
 243
 244 # Where to locate arch specific headers
 245 hdr-arch  := $(SRCARCH)
 246
 247 KCONFIG_CONFIG  ?= .config
 248 export KCONFIG_CONFIG
 249
 250 # SHELL used by kbuild
 251 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 252           else if [ -x /bin/bash ]; then echo /bin/bash; \
 253           else echo sh; fi ; fi)
 254
 255 HOSTCC       = gcc
 256 HOSTCXX      = g++
 257 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 258 HOSTCXXFLAGS = -O2
 259
 260 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 261 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 262                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 263 endif
 264
 265 # Decide whether to build built-in, modular, or both.
 266 # Normally, just do built-in.
 267
 268 KBUILD_MODULES :=
 269 KBUILD_BUILTIN := 1
 270
 271 # If we have only "make modules", don't compile built-in objects.
 272 # When we're building modules with modversions, we need to consider
 273 # the built-in objects during the descend as well, in order to
 274 # make sure the checksums are up to date before we record them.
 275
 276 ifeq ($(MAKECMDGOALS),modules)
 277   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 278 endif
 279
 280 # If we have "make <whatever> modules", compile modules
 281 # in addition to whatever we do anyway.
 282 # Just "make" or "make all" shall build modules as well
 283
 284 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 285   KBUILD_MODULES := 1
 286 endif
 287
 288 ifeq ($(MAKECMDGOALS),)
 289   KBUILD_MODULES := 1
 290 endif
 291
 292 export KBUILD_MODULES KBUILD_BUILTIN
 293 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 294
 295 # Beautify output
 296 # ---------------------------------------------------------------------------
 297 #
 298 # Normally, we echo the whole command before executing it. By making
 299 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 300 # $(quiet) to choose other forms of output instead, e.g.
 301 #
 302 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 303 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 304 #
 305 # If $(quiet) is empty, the whole command will be printed.
 306 # If it is set to "quiet_", only the short version will be printed.
 307 # If it is set to "silent_", nothing will be printed at all, since
 308 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 309 #
 310 # A simple variant is to prefix commands with $(Q) - that's useful
 311 # for commands that shall be hidden in non-verbose mode.
 312 #
 313 #       $(Q)ln $@ :<
 314 #
 315 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 316 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 317
 318 ifeq ($(KBUILD_VERBOSE),1)
 319   quiet =
 320   Q =
 321 else
 322   quiet=quiet_
 323   Q = @
 324 endif
 325
 326 # If the user is running make -s (silent mode), suppress echoing of
 327 # commands
 328
 329 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
 330 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
 331   quiet=silent_
 332 endif
 333 else                                    # make-3.8x
 334 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 335   quiet=silent_
 336 endif
 337 endif
 338
 339 export quiet Q KBUILD_VERBOSE
 340
 341 ifneq ($(CC),)
 342 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
 343 COMPILER := clang
 344 else
 345 COMPILER := gcc
 346 endif
 347 export COMPILER
 348 endif
 349
 350 # Look for make include files relative to root of kernel src
 351 MAKEFLAGS += --include-dir=$(srctree)
 352
 353 # We need some generic definitions (do not try to remake the file).
 354 $(srctree)/scripts/Kbuild.include: ;
 355 include $(srctree)/scripts/Kbuild.include
 356
 357 # Make variables (CC, etc...)
 358 AS              = $(CROSS_COMPILE)as
 359 LD              = $(CROSS_COMPILE)ld
 360 CC              = $(CROSS_COMPILE)gcc
 361 CPP             = $(CC) -E
 362 AR              = $(CROSS_COMPILE)ar
 363 NM              = $(CROSS_COMPILE)nm
 364 STRIP           = $(CROSS_COMPILE)strip
 365 OBJCOPY         = $(CROSS_COMPILE)objcopy
 366 OBJDUMP         = $(CROSS_COMPILE)objdump
 367 AWK             = awk
 368 GENKSYMS        = scripts/genksyms/genksyms
 369 INSTALLKERNEL  := installkernel
 370 DEPMOD          = /sbin/depmod
 371 PERL            = perl
 372 CHECK           = sparse
 373
 374 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 375                   -Wbitwise -Wno-return-void $(CF)
 376 CFLAGS_MODULE   =
 377 AFLAGS_MODULE   =
 378 LDFLAGS_MODULE  =
 379 CFLAGS_KERNEL   =
 380 AFLAGS_KERNEL   =
 381 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 382
 383
 384 # Use USERINCLUDE when you must reference the UAPI directories only.
 385 USERINCLUDE    := \
 386                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 387                 -Iarch/$(hdr-arch)/include/generated/uapi \
 388                 -I$(srctree)/include/uapi \
 389                 -Iinclude/generated/uapi \
 390                 -include $(srctree)/include/linux/kconfig.h
 391
 392 # Use LINUXINCLUDE when you must reference the include/ directory.
 393 # Needed to be compatible with the O= option
 394 LINUXINCLUDE    := \
 395                 -I$(srctree)/arch/$(hdr-arch)/include \
 396                 -Iarch/$(hdr-arch)/include/generated \
 397                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 398                 -Iinclude \
 399                 $(USERINCLUDE)
 400
 401 KBUILD_CPPFLAGS := -D__KERNEL__
 402
 403 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 404                    -fno-strict-aliasing -fno-common \
 405                    -Werror-implicit-function-declaration \
 406                    -Wno-format-security
 407
 408 KBUILD_AFLAGS_KERNEL :=
 409 KBUILD_CFLAGS_KERNEL :=
 410 KBUILD_AFLAGS   := -D__ASSEMBLY__
 411 KBUILD_AFLAGS_MODULE  := -DMODULE
 412 KBUILD_CFLAGS_MODULE  := -DMODULE
 413 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 414
 415 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 416 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 417 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 418
 419 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 420 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 421 export CPP AR NM STRIP OBJCOPY OBJDUMP
 422 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 423 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 424
 425 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 426 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 427 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 428 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 429 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 430 export KBUILD_ARFLAGS
 431
 432 # When compiling out-of-tree modules, put MODVERDIR in the module
 433 # tree rather than in the kernel tree. The kernel tree might
 434 # even be read-only.
 435 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 436
 437 # Files to ignore in find ... statements
 438
 439 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 440                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 441                           -prune -o
 442 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 443                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 444
 445 # ===========================================================================
 446 # Rules shared between *config targets and build targets
 447
 448 # Basic helpers built in scripts/
 449 PHONY += scripts_basic
 450 scripts_basic:
 451         $(Q)$(MAKE) $(build)=scripts/basic
 452         $(Q)rm -f .tmp_quiet_recordmcount
 453
 454 # To avoid any implicit rule to kick in, define an empty command.
 455 scripts/basic/%: scripts_basic ;
 456
 457 PHONY += outputmakefile
 458 # outputmakefile generates a Makefile in the output directory, if using a
 459 # separate output directory. This allows convenient use of make in the
 460 # output directory.
 461 outputmakefile:
 462 ifneq ($(KBUILD_SRC),)
 463         $(Q)ln -fsn $(srctree) source
 464         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 465             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 466 endif
 467
 468 # Support for using generic headers in asm-generic
 469 PHONY += asm-generic
 470 asm-generic:
 471         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 472                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 473         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 474                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 475
 476 # To make sure we do not include .config for any of the *config targets
 477 # catch them early, and hand them over to scripts/kconfig/Makefile
 478 # It is allowed to specify more targets when calling make, including
 479 # mixing *config targets and build targets.
 480 # For example 'make oldconfig all'.
 481 # Detect when mixed targets is specified, and make a second invocation
 482 # of make so .config is not included in this case either (for *config).
 483
 484 version_h := include/generated/uapi/linux/version.h
 485
 486 no-dot-config-targets := clean mrproper distclean \
 487                          cscope gtags TAGS tags help %docs check% coccicheck \
 488                          $(version_h) headers_% archheaders archscripts \
 489                          kernelversion %src-pkg
 490
 491 config-targets := 0
 492 mixed-targets  := 0
 493 dot-config     := 1
 494
 495 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 496         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 497                 dot-config := 0
 498         endif
 499 endif
 500
 501 ifeq ($(KBUILD_EXTMOD),)
 502         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 503                 config-targets := 1
 504                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 505                         mixed-targets := 1
 506                 endif
 507         endif
 508 endif
 509
 510 ifeq ($(mixed-targets),1)
 511 # ===========================================================================
 512 # We're called with mixed targets (*config and build targets).
 513 # Handle them one by one.
 514
 515 PHONY += $(MAKECMDGOALS) __build_one_by_one
 516
 517 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 518         @:
 519
 520 __build_one_by_one:
 521         $(Q)set -e; \
 522         for i in $(MAKECMDGOALS); do \
 523                 $(MAKE) -f $(srctree)/Makefile $$i; \
 524         done
 525
 526 else
 527 ifeq ($(config-targets),1)
 528 # ===========================================================================
 529 # *config targets only - make sure prerequisites are updated, and descend
 530 # in scripts/kconfig to make the *config target
 531
 532 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 533 # KBUILD_DEFCONFIG may point out an alternative default configuration
 534 # used for 'make defconfig'
 535 include $(srctree)/arch/$(SRCARCH)/Makefile
 536 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 537
 538 config: scripts_basic outputmakefile FORCE
 539         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 540
 541 %config: scripts_basic outputmakefile FORCE
 542         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 543
 544 else
 545 # ===========================================================================
 546 # Build targets only - this includes vmlinux, arch specific targets, clean
 547 # targets and others. In general all targets except *config targets.
 548
 549 ifeq ($(KBUILD_EXTMOD),)
 550 # Additional helpers built in scripts/
 551 # Carefully list dependencies so we do not try to build scripts twice
 552 # in parallel
 553 PHONY += scripts
 554 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 555          asm-generic
 556         $(Q)$(MAKE) $(build)=$(@)
 557
 558 # Objects we will link into vmlinux / subdirs we need to visit
 559 init-y          := init/
 560 drivers-y       := drivers/ sound/ firmware/
 561 net-y           := net/
 562 libs-y          := lib/
 563 core-y          := usr/
 564 endif # KBUILD_EXTMOD
 565
 566 ifeq ($(dot-config),1)
 567 # Read in config
 568 -include include/config/auto.conf
 569
 570 ifeq ($(KBUILD_EXTMOD),)
 571 # Read in dependencies to all Kconfig* files, make sure to run
 572 # oldconfig if changes are detected.
 573 -include include/config/auto.conf.cmd
 574
 575 # To avoid any implicit rule to kick in, define an empty command
 576 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 577
 578 # If .config is newer than include/config/auto.conf, someone tinkered
 579 # with it and forgot to run make oldconfig.
 580 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 581 # we execute the config step to be sure to catch updated Kconfig files
 582 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 583         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 584 else
 585 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 586 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 587 PHONY += include/config/auto.conf
 588
 589 include/config/auto.conf:
 590         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 591         echo >&2;                                                       \
 592         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 593         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 594         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 595         echo >&2 ;                                                      \
 596         /bin/false)
 597
 598 endif # KBUILD_EXTMOD
 599
 600 else
 601 # Dummy target needed, because used as prerequisite
 602 include/config/auto.conf: ;
 603 endif # $(dot-config)
 604
 605 # The all: target is the default when no target is given on the
 606 # command line.
 607 # This allow a user to issue only 'make' to build a kernel including modules
 608 # Defaults to vmlinux, but the arch makefile usually adds further targets
 609 all: vmlinux
 610
 611 include $(srctree)/arch/$(SRCARCH)/Makefile
 612
 613 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 614
 615 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 616 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 617 else
 618 KBUILD_CFLAGS   += -O2
 619 endif
 620
 621 ifdef CONFIG_READABLE_ASM
 622 # Disable optimizations that make assembler listings hard to read.
 623 # reorder blocks reorders the control in the function
 624 # ipa clone creates specialized cloned functions
 625 # partial inlining inlines only parts of functions
 626 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 627                  $(call cc-option,-fno-ipa-cp-clone,) \
 628                  $(call cc-option,-fno-partial-inlining)
 629 endif
 630
 631 ifneq ($(CONFIG_FRAME_WARN),0)
 632 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 633 endif
 634
 635 # Handle stack protector mode.
 636 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 637   stackp-flag := -fstack-protector
 638   ifeq ($(call cc-option, $(stackp-flag)),)
 639     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 640              -fstack-protector not supported by compiler)
 641   endif
 642 else
 643 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 644   stackp-flag := -fstack-protector-strong
 645   ifeq ($(call cc-option, $(stackp-flag)),)
 646     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 647               -fstack-protector-strong not supported by compiler)
 648   endif
 649 else
 650   # Force off for distro compilers that enable stack protector by default.
 651   stackp-flag := $(call cc-option, -fno-stack-protector)
 652 endif
 653 endif
 654 KBUILD_CFLAGS += $(stackp-flag)
 655
 656 ifeq ($(COMPILER),clang)
 657 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 658 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 659 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 660 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 661 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 662 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 663 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 664 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 665 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 666 # See modpost pattern 2
 667 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 668 else
 669
 670 # This warning generated too much noise in a regular build.
 671 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 672 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 673 endif
 674
 675 ifdef CONFIG_FRAME_POINTER
 676 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 677 else
 678 # Some targets (ARM with Thumb2, for example), can't be built with frame
 679 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 680 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 681 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 682 # -fomit-frame-pointer with FUNCTION_TRACER.
 683 ifndef CONFIG_FUNCTION_TRACER
 684 KBUILD_CFLAGS   += -fomit-frame-pointer
 685 endif
 686 endif
 687
 688 ifdef CONFIG_DEBUG_INFO
 689 KBUILD_CFLAGS   += -g
 690 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 691 endif
 692
 693 ifdef CONFIG_DEBUG_INFO_REDUCED
 694 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 695                    $(call cc-option,-fno-var-tracking)
 696 endif
 697
 698 ifdef CONFIG_FUNCTION_TRACER
 699 ifdef CONFIG_HAVE_FENTRY
 700 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 701 endif
 702 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 703 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 704 ifdef CONFIG_DYNAMIC_FTRACE
 705         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 706                 BUILD_C_RECORDMCOUNT := y
 707                 export BUILD_C_RECORDMCOUNT
 708         endif
 709 endif
 710 endif
 711
 712 # We trigger additional mismatches with less inlining
 713 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 714 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 715 endif
 716
 717 # arch Makefile may override CC so keep this after arch Makefile is included
 718 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 719 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 720
 721 # warn about C99 declaration after statement
 722 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 723
 724 # disable pointer signed / unsigned warnings in gcc 4.0
 725 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 726
 727 # disable invalid "can't wrap" optimizations for signed / pointers
 728 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 729
 730 # conserve stack if available
 731 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 732
 733 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 734 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 735
 736 # require functions to have arguments in prototypes, not empty 'int foo()'
 737 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 738
 739 # Prohibit date/time macros, which would make the build non-deterministic
 740 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 741
 742 # use the deterministic mode of AR if available
 743 KBUILD_ARFLAGS := $(call ar-option,D)
 744
 745 # check for 'asm goto'
 746 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 747         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 748 endif
 749
 750 include $(srctree)/scripts/Makefile.extrawarn
 751
 752 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 753 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 754 KBUILD_AFLAGS += $(KAFLAGS)
 755 KBUILD_CFLAGS += $(KCFLAGS)
 756
 757 # Use --build-id when available.
 758 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 759                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 760 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 761 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 762
 763 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 764 LDFLAGS_vmlinux += $(call ld-option, -X,)
 765 endif
 766
 767 # Default kernel image to build when no specific target is given.
 768 # KBUILD_IMAGE may be overruled on the command line or
 769 # set in the environment
 770 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 771 # this default value
 772 export KBUILD_IMAGE ?= vmlinux
 773
 774 #
 775 # INSTALL_PATH specifies where to place the updated kernel and system map
 776 # images. Default is /boot, but you can set it to other values
 777 export  INSTALL_PATH ?= /boot
 778
 779 #
 780 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 781 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 782 # an argument if needed. Otherwise it defaults to the kernel install path
 783 #
 784 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 785
 786 #
 787 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 788 # relocations required by build roots.  This is not defined in the
 789 # makefile but the argument can be passed to make if needed.
 790 #
 791
 792 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 793 export MODLIB
 794
 795 #
 796 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 797 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 798 # the default option --strip-debug will be used.  Otherwise,
 799 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 800
 801 ifdef INSTALL_MOD_STRIP
 802 ifeq ($(INSTALL_MOD_STRIP),1)
 803 mod_strip_cmd = $(STRIP) --strip-debug
 804 else
 805 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 806 endif # INSTALL_MOD_STRIP=1
 807 else
 808 mod_strip_cmd = true
 809 endif # INSTALL_MOD_STRIP
 810 export mod_strip_cmd
 811
 812 # Select initial ramdisk compression format, default is gzip(1).
 813 # This shall be used by the dracut(8) tool while creating an initramfs image.
 814 #
 815 INITRD_COMPRESS-y                  := gzip
 816 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 817 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 818 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 819 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 820 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 821 # do not export INITRD_COMPRESS, since we didn't actually
 822 # choose a sane default compression above.
 823 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 824
 825 ifdef CONFIG_MODULE_SIG_ALL
 826 MODSECKEY = ./signing_key.priv
 827 MODPUBKEY = ./signing_key.x509
 828 export MODPUBKEY
 829 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 830 else
 831 mod_sign_cmd = true
 832 endif
 833 export mod_sign_cmd
 834
 835
 836 ifeq ($(KBUILD_EXTMOD),)
 837 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 838
 839 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 840                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 841                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 842
 843 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 844                      $(init-n) $(init-) \
 845                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 846                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 847
 848 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 849 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 850 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 851 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 852 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 853 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 854 libs-y          := $(libs-y1) $(libs-y2)
 855
 856 # Externally visible symbols (used by link-vmlinux.sh)
 857 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 858 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 859 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 860 export LDFLAGS_vmlinux
 861 # used by scripts/pacmage/Makefile
 862 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 863
 864 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 865
 866 # Final link of vmlinux
 867       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 868 quiet_cmd_link-vmlinux = LINK    $@
 869
 870 # Include targets which we want to
 871 # execute if the rest of the kernel build went well.
 872 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 873 ifdef CONFIG_HEADERS_CHECK
 874         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 875 endif
 876 ifdef CONFIG_SAMPLES
 877         $(Q)$(MAKE) $(build)=samples
 878 endif
 879 ifdef CONFIG_BUILD_DOCSRC
 880         $(Q)$(MAKE) $(build)=Documentation
 881 endif
 882         +$(call if_changed,link-vmlinux)
 883
 884 # The actual objects are generated when descending,
 885 # make sure no implicit rule kicks in
 886 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 887
 888 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 889 # Preset locale variables to speed up the build process. Limit locale
 890 # tweaks to this spot to avoid wrong language settings when running
 891 # make menuconfig etc.
 892 # Error messages still appears in the original language
 893
 894 PHONY += $(vmlinux-dirs)
 895 $(vmlinux-dirs): prepare scripts
 896         $(Q)$(MAKE) $(build)=$@
 897
 898 define filechk_kernel.release
 899         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 900 endef
 901
 902 # Store (new) KERNELRELEASE string in include/config/kernel.release
 903 include/config/kernel.release: include/config/auto.conf FORCE
 904         $(call filechk,kernel.release)
 905
 906
 907 # Things we need to do before we recursively start building the kernel
 908 # or the modules are listed in "prepare".
 909 # A multi level approach is used. prepareN is processed before prepareN-1.
 910 # archprepare is used in arch Makefiles and when processed asm symlink,
 911 # version.h and scripts_basic is processed / created.
 912
 913 # Listed in dependency order
 914 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 915
 916 # prepare3 is used to check if we are building in a separate output directory,
 917 # and if so do:
 918 # 1) Check that make has not been executed in the kernel src $(srctree)
 919 prepare3: include/config/kernel.release
 920 ifneq ($(KBUILD_SRC),)
 921         @$(kecho) '  Using $(srctree) as source for kernel'
 922         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 923                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 924                 echo >&2 "  in the '$(srctree)' directory.";\
 925                 /bin/false; \
 926         fi;
 927 endif
 928
 929 # prepare2 creates a makefile if using a separate output directory
 930 prepare2: prepare3 outputmakefile asm-generic
 931
 932 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 933                    include/config/auto.conf
 934         $(cmd_crmodverdir)
 935
 936 archprepare: archheaders archscripts prepare1 scripts_basic
 937
 938 prepare0: archprepare FORCE
 939         $(Q)$(MAKE) $(build)=.
 940
 941 # All the preparing..
 942 prepare: prepare0
 943
 944 # Generate some files
 945 # ---------------------------------------------------------------------------
 946
 947 # KERNELRELEASE can change from a few different places, meaning version.h
 948 # needs to be updated, so this check is forced on all builds
 949
 950 uts_len := 64
 951 define filechk_utsrelease.h
 952         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 953           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 954           exit 1;                                                         \
 955         fi;                                                               \
 956         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 957 endef
 958
 959 define filechk_version.h
 960         (echo \#define LINUX_VERSION_CODE $(shell                         \
 961         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 962         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 963 endef
 964
 965 $(version_h): $(srctree)/Makefile FORCE
 966         $(call filechk,version.h)
 967
 968 include/generated/utsrelease.h: include/config/kernel.release FORCE
 969         $(call filechk,utsrelease.h)
 970
 971 PHONY += headerdep
 972 headerdep:
 973         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 974         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 975
 976 # ---------------------------------------------------------------------------
 977
 978 PHONY += depend dep
 979 depend dep:
 980         @echo '*** Warning: make $@ is unnecessary now.'
 981
 982 # ---------------------------------------------------------------------------
 983 # Firmware install
 984 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 985 export INSTALL_FW_PATH
 986
 987 PHONY += firmware_install
 988 firmware_install: FORCE
 989         @mkdir -p $(objtree)/firmware
 990         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 991
 992 # ---------------------------------------------------------------------------
 993 # Kernel headers
 994
 995 #Default location for installed headers
 996 export INSTALL_HDR_PATH = $(objtree)/usr
 997
 998 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 999
1000 # If we do an all arch process set dst to asm-$(hdr-arch)
1001 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1002
1003 PHONY += archheaders
1004 archheaders:
1005
1006 PHONY += archscripts
1007 archscripts:
1008
1009 PHONY += __headers
1010 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1011         $(Q)$(MAKE) $(build)=scripts build_unifdef
1012
1013 PHONY += headers_install_all
1014 headers_install_all:
1015         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1016
1017 PHONY += headers_install
1018 headers_install: __headers
1019         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1020           $(error Headers not exportable for the $(SRCARCH) architecture))
1021         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1022         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1023
1024 PHONY += headers_check_all
1025 headers_check_all: headers_install_all
1026         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1027
1028 PHONY += headers_check
1029 headers_check: headers_install
1030         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1031         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1032
1033 # ---------------------------------------------------------------------------
1034 # Modules
1035
1036 ifdef CONFIG_MODULES
1037
1038 # By default, build modules as well
1039
1040 all: modules
1041
1042 # Build modules
1043 #
1044 # A module can be listed more than once in obj-m resulting in
1045 # duplicate lines in modules.order files.  Those are removed
1046 # using awk while concatenating to the final file.
1047
1048 PHONY += modules
1049 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1050         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1051         @$(kecho) '  Building modules, stage 2.';
1052         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1053         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1054
1055 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1056         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1057
1058 %/modules.builtin: include/config/auto.conf
1059         $(Q)$(MAKE) $(modbuiltin)=$*
1060
1061
1062 # Target to prepare building external modules
1063 PHONY += modules_prepare
1064 modules_prepare: prepare scripts
1065
1066 # Target to install modules
1067 PHONY += modules_install
1068 modules_install: _modinst_ _modinst_post
1069
1070 PHONY += _modinst_
1071 _modinst_:
1072         @rm -rf $(MODLIB)/kernel
1073         @rm -f $(MODLIB)/source
1074         @mkdir -p $(MODLIB)/kernel
1075         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1076         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1077                 rm -f $(MODLIB)/build ; \
1078                 ln -s $(CURDIR) $(MODLIB)/build ; \
1079         fi
1080         @cp -f $(objtree)/modules.order $(MODLIB)/
1081         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1082         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1083
1084 # This depmod is only for convenience to give the initial
1085 # boot a modules.dep even before / is mounted read-write.  However the
1086 # boot script depmod is the master version.
1087 PHONY += _modinst_post
1088 _modinst_post: _modinst_
1089         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1090         $(call cmd,depmod)
1091
1092 ifeq ($(CONFIG_MODULE_SIG), y)
1093 PHONY += modules_sign
1094 modules_sign:
1095         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1096 endif
1097
1098 else # CONFIG_MODULES
1099
1100 # Modules not configured
1101 # ---------------------------------------------------------------------------
1102
1103 modules modules_install: FORCE
1104         @echo >&2
1105         @echo >&2 "The present kernel configuration has modules disabled."
1106         @echo >&2 "Type 'make config' and enable loadable module support."
1107         @echo >&2 "Then build a kernel with module support enabled."
1108         @echo >&2
1109         @exit 1
1110
1111 endif # CONFIG_MODULES
1112
1113 ###
1114 # Cleaning is done on three levels.
1115 # make clean     Delete most generated files
1116 #                Leave enough to build external modules
1117 # make mrproper  Delete the current configuration, and all generated files
1118 # make distclean Remove editor backup files, patch leftover files and the like
1119
1120 # Directories & files removed with 'make clean'
1121 CLEAN_DIRS  += $(MODVERDIR)
1122
1123 # Directories & files removed with 'make mrproper'
1124 MRPROPER_DIRS  += include/config usr/include include/generated          \
1125                   arch/*/include/generated .tmp_objdiff
1126 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1127                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1128                   signing_key.priv signing_key.x509 x509.genkey         \
1129                   extra_certificates signing_key.x509.keyid             \
1130                   signing_key.x509.signer include/linux/version.h
1131
1132 # clean - Delete most, but leave enough to build external modules
1133 #
1134 clean: rm-dirs  := $(CLEAN_DIRS)
1135 clean: rm-files := $(CLEAN_FILES)
1136 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1137
1138 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1139 $(clean-dirs):
1140         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1141
1142 vmlinuxclean:
1143         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1144
1145 clean: archclean vmlinuxclean
1146
1147 # mrproper - Delete all generated files, including .config
1148 #
1149 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1150 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1151 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1152
1153 PHONY += $(mrproper-dirs) mrproper archmrproper
1154 $(mrproper-dirs):
1155         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1156
1157 mrproper: clean archmrproper $(mrproper-dirs)
1158         $(call cmd,rmdirs)
1159         $(call cmd,rmfiles)
1160
1161 # distclean
1162 #
1163 PHONY += distclean
1164
1165 distclean: mrproper
1166         @find $(srctree) $(RCS_FIND_IGNORE) \
1167                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1168                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1169                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1170                 -type f -print | xargs rm -f
1171
1172
1173 # Packaging of the kernel to various formats
1174 # ---------------------------------------------------------------------------
1175 # rpm target kept for backward compatibility
1176 package-dir     := $(srctree)/scripts/package
1177
1178 %src-pkg: FORCE
1179         $(Q)$(MAKE) $(build)=$(package-dir) $@
1180 %pkg: include/config/kernel.release FORCE
1181         $(Q)$(MAKE) $(build)=$(package-dir) $@
1182 rpm: include/config/kernel.release FORCE
1183         $(Q)$(MAKE) $(build)=$(package-dir) $@
1184
1185
1186 # Brief documentation of the typical targets used
1187 # ---------------------------------------------------------------------------
1188
1189 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1190 boards := $(notdir $(boards))
1191 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1192 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1193
1194 help:
1195         @echo  'Cleaning targets:'
1196         @echo  '  clean           - Remove most generated files but keep the config and'
1197         @echo  '                    enough build support to build external modules'
1198         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1199         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1200         @echo  ''
1201         @echo  'Configuration targets:'
1202         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1203         @echo  ''
1204         @echo  'Other generic targets:'
1205         @echo  '  all             - Build all targets marked with [*]'
1206         @echo  '* vmlinux         - Build the bare kernel'
1207         @echo  '* modules         - Build all modules'
1208         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1209         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1210         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1211         @echo  '  dir/            - Build all files in dir and below'
1212         @echo  '  dir/file.[oisS] - Build specified target only'
1213         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1214         @echo  '                    (requires a recent binutils and recent build (System.map))'
1215         @echo  '  dir/file.ko     - Build module including final link'
1216         @echo  '  modules_prepare - Set up for building external modules'
1217         @echo  '  tags/TAGS       - Generate tags file for editors'
1218         @echo  '  cscope          - Generate cscope index'
1219         @echo  '  gtags           - Generate GNU GLOBAL index'
1220         @echo  '  kernelrelease   - Output the release version string'
1221         @echo  '  kernelversion   - Output the version stored in Makefile'
1222         @echo  '  image_name      - Output the image name'
1223         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1224          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1225          echo  ''
1226         @echo  'Static analysers'
1227         @echo  '  checkstack      - Generate a list of stack hogs'
1228         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1229         @echo  '  versioncheck    - Sanity check on version.h usage'
1230         @echo  '  includecheck    - Check for duplicate included header files'
1231         @echo  '  export_report   - List the usages of all exported symbols'
1232         @echo  '  headers_check   - Sanity check on exported headers'
1233         @echo  '  headerdep       - Detect inclusion cycles in headers'
1234         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1235         @echo  ''
1236         @echo  'Kernel packaging:'
1237         @$(MAKE) $(build)=$(package-dir) help
1238         @echo  ''
1239         @echo  'Documentation targets:'
1240         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1241         @echo  ''
1242         @echo  'Architecture specific targets ($(SRCARCH)):'
1243         @$(if $(archhelp),$(archhelp),\
1244                 echo '  No architecture specific help defined for $(SRCARCH)')
1245         @echo  ''
1246         @$(if $(boards), \
1247                 $(foreach b, $(boards), \
1248                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1249                 echo '')
1250         @$(if $(board-dirs), \
1251                 $(foreach b, $(board-dirs), \
1252                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1253                 printf "  %-16s - Show all of the above\\n" help-boards; \
1254                 echo '')
1255
1256         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1257         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1258         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1259         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1260         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1261         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1262         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1263         @echo  '                1: warnings which may be relevant and do not occur too often'
1264         @echo  '                2: warnings which occur quite often but may still be relevant'
1265         @echo  '                3: more obscure warnings, can most likely be ignored'
1266         @echo  '                Multiple levels can be combined with W=12 or W=123'
1267         @echo  ''
1268         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1269         @echo  'For further info see the ./README file'
1270
1271
1272 help-board-dirs := $(addprefix help-,$(board-dirs))
1273
1274 help-boards: $(help-board-dirs)
1275
1276 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1277
1278 $(help-board-dirs): help-%:
1279         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1280         @$(if $(boards-per-dir), \
1281                 $(foreach b, $(boards-per-dir), \
1282                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1283                 echo '')
1284
1285
1286 # Documentation targets
1287 # ---------------------------------------------------------------------------
1288 %docs: scripts_basic FORCE
1289         $(Q)$(MAKE) $(build)=scripts build_docproc
1290         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1291
1292 else # KBUILD_EXTMOD
1293
1294 ###
1295 # External module support.
1296 # When building external modules the kernel used as basis is considered
1297 # read-only, and no consistency checks are made and the make
1298 # system is not used on the basis kernel. If updates are required
1299 # in the basis kernel ordinary make commands (without M=...) must
1300 # be used.
1301 #
1302 # The following are the only valid targets when building external
1303 # modules.
1304 # make M=dir clean     Delete all automatically generated files
1305 # make M=dir modules   Make all modules in specified dir
1306 # make M=dir           Same as 'make M=dir modules'
1307 # make M=dir modules_install
1308 #                      Install the modules built in the module directory
1309 #                      Assumes install directory is already created
1310
1311 # We are always building modules
1312 KBUILD_MODULES := 1
1313 PHONY += crmodverdir
1314 crmodverdir:
1315         $(cmd_crmodverdir)
1316
1317 PHONY += $(objtree)/Module.symvers
1318 $(objtree)/Module.symvers:
1319         @test -e $(objtree)/Module.symvers || ( \
1320         echo; \
1321         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1322         echo "           is missing; modules will have no dependencies and modversions."; \
1323         echo )
1324
1325 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1326 PHONY += $(module-dirs) modules
1327 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1328         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1329
1330 modules: $(module-dirs)
1331         @$(kecho) '  Building modules, stage 2.';
1332         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1333
1334 PHONY += modules_install
1335 modules_install: _emodinst_ _emodinst_post
1336
1337 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1338 PHONY += _emodinst_
1339 _emodinst_:
1340         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1341         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1342
1343 PHONY += _emodinst_post
1344 _emodinst_post: _emodinst_
1345         $(call cmd,depmod)
1346
1347 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1348
1349 PHONY += $(clean-dirs) clean
1350 $(clean-dirs):
1351         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1352
1353 clean:  rm-dirs := $(MODVERDIR)
1354 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1355
1356 help:
1357         @echo  '  Building external modules.'
1358         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1359         @echo  ''
1360         @echo  '  modules         - default target, build the module(s)'
1361         @echo  '  modules_install - install the module'
1362         @echo  '  clean           - remove generated files in module directory only'
1363         @echo  ''
1364
1365 # Dummies...
1366 PHONY += prepare scripts
1367 prepare: ;
1368 scripts: ;
1369 endif # KBUILD_EXTMOD
1370
1371 clean: $(clean-dirs)
1372         $(call cmd,rmdirs)
1373         $(call cmd,rmfiles)
1374         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1375                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1376                 -o -name '*.ko.*' \
1377                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1378                 -o -name '*.symtypes' -o -name 'modules.order' \
1379                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1380                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1381
1382 # Generate tags for editors
1383 # ---------------------------------------------------------------------------
1384 quiet_cmd_tags = GEN     $@
1385       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1386
1387 tags TAGS cscope gtags: FORCE
1388         $(call cmd,tags)
1389
1390 # Scripts to check various things for consistency
1391 # ---------------------------------------------------------------------------
1392
1393 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1394
1395 includecheck:
1396         find $(srctree)/* $(RCS_FIND_IGNORE) \
1397                 -name '*.[hcS]' -type f -print | sort \
1398                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1399
1400 versioncheck:
1401         find $(srctree)/* $(RCS_FIND_IGNORE) \
1402                 -name '*.[hcS]' -type f -print | sort \
1403                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1404
1405 coccicheck:
1406         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1407
1408 namespacecheck:
1409         $(PERL) $(srctree)/scripts/namespace.pl
1410
1411 export_report:
1412         $(PERL) $(srctree)/scripts/export_report.pl
1413
1414 endif #ifeq ($(config-targets),1)
1415 endif #ifeq ($(mixed-targets),1)
1416
1417 PHONY += checkstack kernelrelease kernelversion image_name
1418
1419 # UML needs a little special treatment here.  It wants to use the host
1420 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1421 # else wants $(ARCH), including people doing cross-builds, which means
1422 # that $(SUBARCH) doesn't work here.
1423 ifeq ($(ARCH), um)
1424 CHECKSTACK_ARCH := $(SUBARCH)
1425 else
1426 CHECKSTACK_ARCH := $(ARCH)
1427 endif
1428 checkstack:
1429         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1430         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1431
1432 kernelrelease:
1433         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1434
1435 kernelversion:
1436         @echo $(KERNELVERSION)
1437
1438 image_name:
1439         @echo $(KBUILD_IMAGE)
1440
1441 # Clear a bunch of variables before executing the submake
1442 tools/: FORCE
1443         $(Q)mkdir -p $(objtree)/tools
1444         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1445
1446 tools/%: FORCE
1447         $(Q)mkdir -p $(objtree)/tools
1448         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1449
1450 # Single targets
1451 # ---------------------------------------------------------------------------
1452 # Single targets are compatible with:
1453 # - build with mixed source and output
1454 # - build with separate output dir 'make O=...'
1455 # - external modules
1456 #
1457 #  target-dir => where to store outputfile
1458 #  build-dir  => directory in kernel source tree to use
1459
1460 ifeq ($(KBUILD_EXTMOD),)
1461         build-dir  = $(patsubst %/,%,$(dir $@))
1462         target-dir = $(dir $@)
1463 else
1464         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1465         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1466         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1467 endif
1468
1469 %.s: %.c prepare scripts FORCE
1470         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1471 %.i: %.c prepare scripts FORCE
1472         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1473 %.o: %.c prepare scripts FORCE
1474         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1475 %.lst: %.c prepare scripts FORCE
1476         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1477 %.s: %.S prepare scripts FORCE
1478         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1479 %.o: %.S prepare scripts FORCE
1480         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1481 %.symtypes: %.c prepare scripts FORCE
1482         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1483
1484 # Modules
1485 /: prepare scripts FORCE
1486         $(cmd_crmodverdir)
1487         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1488         $(build)=$(build-dir)
1489 %/: prepare scripts FORCE
1490         $(cmd_crmodverdir)
1491         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1492         $(build)=$(build-dir)
1493 %.ko: prepare scripts FORCE
1494         $(cmd_crmodverdir)
1495         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1496         $(build)=$(build-dir) $(@:.ko=.o)
1497         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1498
1499 # FIXME Should go into a make.lib or something
1500 # ===========================================================================
1501
1502 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1503       cmd_rmdirs = rm -rf $(rm-dirs)
1504
1505 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1506       cmd_rmfiles = rm -f $(rm-files)
1507
1508 # Run depmod only if we have System.map and depmod is executable
1509 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1510       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1511                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1512
1513 # Create temporary dir for module support files
1514 # clean it up only when building all modules
1515 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1516                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1517
1518 # read all saved command lines
1519
1520 targets := $(wildcard $(sort $(targets)))
1521 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1522
1523 ifneq ($(cmd_files),)
1524   $(cmd_files): ;       # Do not try to update included dependency files
1525   include $(cmd_files)
1526 endif
1527
1528 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1529 # Usage:
1530 # $(Q)$(MAKE) $(clean)=dir
1531 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1532
1533 endif   # skip-makefile
1534
1535 PHONY += FORCE
1536 FORCE:
1537
1538 # Declare the contents of the .PHONY variable as phony.  We keep that
1539 # information in a variable so we can use it in if_changed and friends.
1540 .PHONY: $(PHONY)