Makefile

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