Makefile

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