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