Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 1
   3 SUBLEVEL = 50
   4 EXTRAVERSION =
   5 NAME = Series 4800
   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
 219 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 220 # first, and if a usermode build is happening, the "ARCH=um" on the command
 221 # line overrides the setting of ARCH below.  If a native build is happening,
 222 # then ARCH is assigned, getting whatever value it gets normally, and
 223 # SUBARCH is subsequently ignored.
 224
 225 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 226                                   -e s/sun4u/sparc64/ \
 227                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 228                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 229                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 230                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 231
 232 # Cross compiling and selecting different set of gcc/bin-utils
 233 # ---------------------------------------------------------------------------
 234 #
 235 # When performing cross compilation for other architectures ARCH shall be set
 236 # to the target architecture. (See arch/* for the possibilities).
 237 # ARCH can be set during invocation of make:
 238 # make ARCH=ia64
 239 # Another way is to have ARCH set in the environment.
 240 # The default ARCH is the host where make is executed.
 241
 242 # CROSS_COMPILE specify the prefix used for all executables used
 243 # during compilation. Only gcc and related bin-utils executables
 244 # are prefixed with $(CROSS_COMPILE).
 245 # CROSS_COMPILE can be set on the command line
 246 # make CROSS_COMPILE=ia64-linux-
 247 # Alternatively CROSS_COMPILE can be set in the environment.
 248 # A third alternative is to store a setting in .config so that plain
 249 # "make" in the configured kernel build directory always uses that.
 250 # Default value for CROSS_COMPILE is not to prefix executables
 251 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 252 ARCH            ?= $(SUBARCH)
 253 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 254
 255 # Architecture as present in compile.h
 256 UTS_MACHINE     := $(ARCH)
 257 SRCARCH         := $(ARCH)
 258
 259 # Additional ARCH settings for x86
 260 ifeq ($(ARCH),i386)
 261         SRCARCH := x86
 262 endif
 263 ifeq ($(ARCH),x86_64)
 264         SRCARCH := x86
 265 endif
 266
 267 # Additional ARCH settings for sparc
 268 ifeq ($(ARCH),sparc32)
 269        SRCARCH := sparc
 270 endif
 271 ifeq ($(ARCH),sparc64)
 272        SRCARCH := sparc
 273 endif
 274
 275 # Additional ARCH settings for sh
 276 ifeq ($(ARCH),sh64)
 277        SRCARCH := sh
 278 endif
 279
 280 # Additional ARCH settings for tile
 281 ifeq ($(ARCH),tilepro)
 282        SRCARCH := tile
 283 endif
 284 ifeq ($(ARCH),tilegx)
 285        SRCARCH := tile
 286 endif
 287
 288 # Where to locate arch specific headers
 289 hdr-arch  := $(SRCARCH)
 290
 291 KCONFIG_CONFIG  ?= .config
 292 export KCONFIG_CONFIG
 293
 294 # SHELL used by kbuild
 295 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 296           else if [ -x /bin/bash ]; then echo /bin/bash; \
 297           else echo sh; fi ; fi)
 298
 299 HOSTCC       = gcc
 300 HOSTCXX      = g++
 301 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 302 HOSTCXXFLAGS = -O2
 303
 304 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 305 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 306                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 307 endif
 308
 309 # Decide whether to build built-in, modular, or both.
 310 # Normally, just do built-in.
 311
 312 KBUILD_MODULES :=
 313 KBUILD_BUILTIN := 1
 314
 315 # If we have only "make modules", don't compile built-in objects.
 316 # When we're building modules with modversions, we need to consider
 317 # the built-in objects during the descend as well, in order to
 318 # make sure the checksums are up to date before we record them.
 319
 320 ifeq ($(MAKECMDGOALS),modules)
 321   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 322 endif
 323
 324 # If we have "make <whatever> modules", compile modules
 325 # in addition to whatever we do anyway.
 326 # Just "make" or "make all" shall build modules as well
 327
 328 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 329   KBUILD_MODULES := 1
 330 endif
 331
 332 ifeq ($(MAKECMDGOALS),)
 333   KBUILD_MODULES := 1
 334 endif
 335
 336 export KBUILD_MODULES KBUILD_BUILTIN
 337 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 338
 339 ifneq ($(CC),)
 340 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
 341 COMPILER := clang
 342 else
 343 COMPILER := gcc
 344 endif
 345 export COMPILER
 346 endif
 347
 348 # We need some generic definitions (do not try to remake the file).
 349 scripts/Kbuild.include: ;
 350 include scripts/Kbuild.include
 351
 352 # Make variables (CC, etc...)
 353 AS              = $(CROSS_COMPILE)as
 354 LD              = $(CROSS_COMPILE)ld
 355 CC              = $(CROSS_COMPILE)gcc
 356 CPP             = $(CC) -E
 357 AR              = $(CROSS_COMPILE)ar
 358 NM              = $(CROSS_COMPILE)nm
 359 STRIP           = $(CROSS_COMPILE)strip
 360 OBJCOPY         = $(CROSS_COMPILE)objcopy
 361 OBJDUMP         = $(CROSS_COMPILE)objdump
 362 AWK             = awk
 363 GENKSYMS        = scripts/genksyms/genksyms
 364 INSTALLKERNEL  := installkernel
 365 DEPMOD          = /sbin/depmod
 366 PERL            = perl
 367 PYTHON          = python
 368 CHECK           = sparse
 369
 370 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 371                   -Wbitwise -Wno-return-void $(CF)
 372 CFLAGS_MODULE   =
 373 AFLAGS_MODULE   =
 374 LDFLAGS_MODULE  =
 375 CFLAGS_KERNEL   =
 376 AFLAGS_KERNEL   =
 377 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
 378
 379
 380 # Use USERINCLUDE when you must reference the UAPI directories only.
 381 USERINCLUDE    := \
 382                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 383                 -Iarch/$(hdr-arch)/include/generated/uapi \
 384                 -I$(srctree)/include/uapi \
 385                 -Iinclude/generated/uapi \
 386                 -include $(srctree)/include/linux/kconfig.h
 387
 388 # Use LINUXINCLUDE when you must reference the include/ directory.
 389 # Needed to be compatible with the O= option
 390 LINUXINCLUDE    := \
 391                 -I$(srctree)/arch/$(hdr-arch)/include \
 392                 -Iarch/$(hdr-arch)/include/generated/uapi \
 393                 -Iarch/$(hdr-arch)/include/generated \
 394                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 395                 -Iinclude \
 396                 $(USERINCLUDE)
 397
 398 KBUILD_CPPFLAGS := -D__KERNEL__
 399
 400 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 401                    -fno-strict-aliasing -fno-common \
 402                    -Werror-implicit-function-declaration \
 403                    -Wno-format-security \
 404                    -std=gnu89
 405
 406 KBUILD_AFLAGS_KERNEL :=
 407 KBUILD_CFLAGS_KERNEL :=
 408 KBUILD_AFLAGS   := -D__ASSEMBLY__
 409 KBUILD_AFLAGS_MODULE  := -DMODULE
 410 KBUILD_CFLAGS_MODULE  := -DMODULE
 411 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 412
 413 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 414 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 415 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 416
 417 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 418 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 419 export CPP AR NM STRIP OBJCOPY OBJDUMP
 420 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 421 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 422
 423 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 424 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
 425 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 426 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 427 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 428 export KBUILD_ARFLAGS
 429
 430 # When compiling out-of-tree modules, put MODVERDIR in the module
 431 # tree rather than in the kernel tree. The kernel tree might
 432 # even be read-only.
 433 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 434
 435 # Files to ignore in find ... statements
 436
 437 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 438                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 439                           -prune -o
 440 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 441                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 442
 443 # ===========================================================================
 444 # Rules shared between *config targets and build targets
 445
 446 # Basic helpers built in scripts/
 447 PHONY += scripts_basic
 448 scripts_basic:
 449         $(Q)$(MAKE) $(build)=scripts/basic
 450         $(Q)rm -f .tmp_quiet_recordmcount
 451
 452 # To avoid any implicit rule to kick in, define an empty command.
 453 scripts/basic/%: scripts_basic ;
 454
 455 PHONY += outputmakefile
 456 # outputmakefile generates a Makefile in the output directory, if using a
 457 # separate output directory. This allows convenient use of make in the
 458 # output directory.
 459 outputmakefile:
 460 ifneq ($(KBUILD_SRC),)
 461         $(Q)ln -fsn $(srctree) source
 462         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 463             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 464 endif
 465
 466 # Support for using generic headers in asm-generic
 467 PHONY += asm-generic
 468 asm-generic:
 469         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 470                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 471         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 472                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 473
 474 # To make sure we do not include .config for any of the *config targets
 475 # catch them early, and hand them over to scripts/kconfig/Makefile
 476 # It is allowed to specify more targets when calling make, including
 477 # mixing *config targets and build targets.
 478 # For example 'make oldconfig all'.
 479 # Detect when mixed targets is specified, and make a second invocation
 480 # of make so .config is not included in this case either (for *config).
 481
 482 version_h := include/generated/uapi/linux/version.h
 483 old_version_h := include/linux/version.h
 484
 485 no-dot-config-targets := clean mrproper distclean \
 486                          cscope gtags TAGS tags help% %docs check% coccicheck \
 487                          $(version_h) headers_% archheaders archscripts \
 488                          kernelversion %src-pkg
 489
 490 config-targets := 0
 491 mixed-targets  := 0
 492 dot-config     := 1
 493
 494 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 495         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 496                 dot-config := 0
 497         endif
 498 endif
 499
 500 ifeq ($(KBUILD_EXTMOD),)
 501         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 502                 config-targets := 1
 503                 ifneq ($(words $(MAKECMDGOALS)),1)
 504                         mixed-targets := 1
 505                 endif
 506         endif
 507 endif
 508
 509 ifeq ($(mixed-targets),1)
 510 # ===========================================================================
 511 # We're called with mixed targets (*config and build targets).
 512 # Handle them one by one.
 513
 514 PHONY += $(MAKECMDGOALS) __build_one_by_one
 515
 516 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 517         @:
 518
 519 __build_one_by_one:
 520         $(Q)set -e; \
 521         for i in $(MAKECMDGOALS); do \
 522                 $(MAKE) -f $(srctree)/Makefile $$i; \
 523         done
 524
 525 else
 526 ifeq ($(config-targets),1)
 527 # ===========================================================================
 528 # *config targets only - make sure prerequisites are updated, and descend
 529 # in scripts/kconfig to make the *config target
 530
 531 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 532 # KBUILD_DEFCONFIG may point out an alternative default configuration
 533 # used for 'make defconfig'
 534 include arch/$(SRCARCH)/Makefile
 535 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 536
 537 config: scripts_basic outputmakefile FORCE
 538         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 539
 540 %config: scripts_basic outputmakefile FORCE
 541         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 542
 543 else
 544 # ===========================================================================
 545 # Build targets only - this includes vmlinux, arch specific targets, clean
 546 # targets and others. In general all targets except *config targets.
 547
 548 ifeq ($(KBUILD_EXTMOD),)
 549 # Additional helpers built in scripts/
 550 # Carefully list dependencies so we do not try to build scripts twice
 551 # in parallel
 552 PHONY += scripts
 553 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 554          asm-generic
 555         $(Q)$(MAKE) $(build)=$(@)
 556
 557 # Objects we will link into vmlinux / subdirs we need to visit
 558 init-y          := init/
 559 drivers-y       := drivers/ sound/ firmware/
 560 net-y           := net/
 561 libs-y          := lib/
 562 core-y          := usr/
 563 endif # KBUILD_EXTMOD
 564
 565 ifeq ($(dot-config),1)
 566 # Read in config
 567 -include include/config/auto.conf
 568
 569 ifeq ($(KBUILD_EXTMOD),)
 570 # Read in dependencies to all Kconfig* files, make sure to run
 571 # oldconfig if changes are detected.
 572 -include include/config/auto.conf.cmd
 573
 574 # To avoid any implicit rule to kick in, define an empty command
 575 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 576
 577 # If .config is newer than include/config/auto.conf, someone tinkered
 578 # with it and forgot to run make oldconfig.
 579 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 580 # we execute the config step to be sure to catch updated Kconfig files
 581 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 582         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 583 else
 584 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 585 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 586 PHONY += include/config/auto.conf
 587
 588 include/config/auto.conf:
 589         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 590         echo >&2;                                                       \
 591         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 592         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 593         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 594         echo >&2 ;                                                      \
 595         /bin/false)
 596
 597 endif # KBUILD_EXTMOD
 598
 599 else
 600 # Dummy target needed, because used as prerequisite
 601 include/config/auto.conf: ;
 602 endif # $(dot-config)
 603
 604 # The all: target is the default when no target is given on the
 605 # command line.
 606 # This allow a user to issue only 'make' to build a kernel including modules
 607 # Defaults to vmlinux, but the arch makefile usually adds further targets
 608 all: vmlinux
 609
 610 include arch/$(SRCARCH)/Makefile
 611
 612 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 613 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 614 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 615 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 616 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 617 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 618 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 619
 620 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 621 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 622 else
 623 KBUILD_CFLAGS   += -O2
 624 endif
 625
 626 # Tell gcc to never replace conditional load with a non-conditional one
 627 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 628
 629 # check for 'asm goto'
 630 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 631         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 632         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 633 endif
 634
 635 ifdef CONFIG_READABLE_ASM
 636 # Disable optimizations that make assembler listings hard to read.
 637 # reorder blocks reorders the control in the function
 638 # ipa clone creates specialized cloned functions
 639 # partial inlining inlines only parts of functions
 640 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 641                  $(call cc-option,-fno-ipa-cp-clone,) \
 642                  $(call cc-option,-fno-partial-inlining)
 643 endif
 644
 645 ifneq ($(CONFIG_FRAME_WARN),0)
 646 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 647 endif
 648
 649 # Handle stack protector mode.
 650 #
 651 # Since kbuild can potentially perform two passes (first with the old
 652 # .config values and then with updated .config values), we cannot error out
 653 # if a desired compiler option is unsupported. If we were to error, kbuild
 654 # could never get to the second pass and actually notice that we changed
 655 # the option to something that was supported.
 656 #
 657 # Additionally, we don't want to fallback and/or silently change which compiler
 658 # flags will be used, since that leads to producing kernels with different
 659 # security feature characteristics depending on the compiler used. ("But I
 660 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
 661 #
 662 # The middle ground is to warn here so that the failed option is obvious, but
 663 # to let the build fail with bad compiler flags so that we can't produce a
 664 # kernel when there is a CONFIG and compiler mismatch.
 665 #
 666 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 667   stackp-flag := -fstack-protector
 668   ifeq ($(call cc-option, $(stackp-flag)),)
 669     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 670              -fstack-protector not supported by compiler)
 671   endif
 672 else
 673 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 674   stackp-flag := -fstack-protector-strong
 675   ifeq ($(call cc-option, $(stackp-flag)),)
 676     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 677               -fstack-protector-strong not supported by compiler)
 678   endif
 679 else
 680   # Force off for distro compilers that enable stack protector by default.
 681   stackp-flag := $(call cc-option, -fno-stack-protector)
 682 endif
 683 endif
 684 KBUILD_CFLAGS += $(stackp-flag)
 685
 686 ifeq ($(COMPILER),clang)
 687 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 688 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 689 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 690 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 691 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 692 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 693 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 694 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 695 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 696 # See modpost pattern 2
 697 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 698 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 699 else
 700
 701 # These warnings generated too much noise in a regular build.
 702 # Use make W=1 to enable them (see scripts/Makefile.build)
 703 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 704 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 705 endif
 706
 707 ifdef CONFIG_FRAME_POINTER
 708 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 709 else
 710 # Some targets (ARM with Thumb2, for example), can't be built with frame
 711 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 712 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 713 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 714 # -fomit-frame-pointer with FUNCTION_TRACER.
 715 ifndef CONFIG_FUNCTION_TRACER
 716 KBUILD_CFLAGS   += -fomit-frame-pointer
 717 endif
 718 endif
 719
 720 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 721
 722 ifdef CONFIG_DEBUG_INFO
 723 ifdef CONFIG_DEBUG_INFO_SPLIT
 724 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 725 else
 726 KBUILD_CFLAGS   += -g
 727 endif
 728 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 729 endif
 730 ifdef CONFIG_DEBUG_INFO_DWARF4
 731 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 732 endif
 733
 734 ifdef CONFIG_DEBUG_INFO_REDUCED
 735 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 736                    $(call cc-option,-fno-var-tracking)
 737 endif
 738
 739 ifdef CONFIG_FUNCTION_TRACER
 740 ifndef CC_FLAGS_FTRACE
 741 CC_FLAGS_FTRACE := -pg
 742 endif
 743 export CC_FLAGS_FTRACE
 744 ifdef CONFIG_HAVE_FENTRY
 745 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 746 endif
 747 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 748 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 749 ifdef CONFIG_DYNAMIC_FTRACE
 750         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 751                 BUILD_C_RECORDMCOUNT := y
 752                 export BUILD_C_RECORDMCOUNT
 753         endif
 754 endif
 755 endif
 756
 757 # We trigger additional mismatches with less inlining
 758 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 759 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 760 endif
 761
 762 # arch Makefile may override CC so keep this after arch Makefile is included
 763 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 764 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 765
 766 # warn about C99 declaration after statement
 767 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 768
 769 # disable pointer signed / unsigned warnings in gcc 4.0
 770 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 771
 772 # disable invalid "can't wrap" optimizations for signed / pointers
 773 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 774
 775 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 776 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 777
 778 # conserve stack if available
 779 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 780
 781 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 782 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 783
 784 # require functions to have arguments in prototypes, not empty 'int foo()'
 785 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 786
 787 # Prohibit date/time macros, which would make the build non-deterministic
 788 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 789
 790 # use the deterministic mode of AR if available
 791 KBUILD_ARFLAGS := $(call ar-option,D)
 792
 793 include scripts/Makefile.kasan
 794 include scripts/Makefile.extrawarn
 795
 796 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 797 # last assignments
 798 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 799 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 800 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 801
 802 # Use --build-id when available.
 803 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 804                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 805 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 806 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 807
 808 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 809 LDFLAGS_vmlinux += $(call ld-option, -X,)
 810 endif
 811
 812 # Default kernel image to build when no specific target is given.
 813 # KBUILD_IMAGE may be overruled on the command line or
 814 # set in the environment
 815 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 816 # this default value
 817 export KBUILD_IMAGE ?= vmlinux
 818
 819 #
 820 # INSTALL_PATH specifies where to place the updated kernel and system map
 821 # images. Default is /boot, but you can set it to other values
 822 export  INSTALL_PATH ?= /boot
 823
 824 #
 825 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 826 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 827 # an argument if needed. Otherwise it defaults to the kernel install path
 828 #
 829 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 830
 831 #
 832 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 833 # relocations required by build roots.  This is not defined in the
 834 # makefile but the argument can be passed to make if needed.
 835 #
 836
 837 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 838 export MODLIB
 839
 840 #
 841 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 842 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 843 # the default option --strip-debug will be used.  Otherwise,
 844 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 845
 846 ifdef INSTALL_MOD_STRIP
 847 ifeq ($(INSTALL_MOD_STRIP),1)
 848 mod_strip_cmd = $(STRIP) --strip-debug
 849 else
 850 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 851 endif # INSTALL_MOD_STRIP=1
 852 else
 853 mod_strip_cmd = true
 854 endif # INSTALL_MOD_STRIP
 855 export mod_strip_cmd
 856
 857 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 858 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 859 # or CONFIG_MODULE_COMPRESS_XZ.
 860
 861 mod_compress_cmd = true
 862 ifdef CONFIG_MODULE_COMPRESS
 863   ifdef CONFIG_MODULE_COMPRESS_GZIP
 864     mod_compress_cmd = gzip -n
 865   endif # CONFIG_MODULE_COMPRESS_GZIP
 866   ifdef CONFIG_MODULE_COMPRESS_XZ
 867     mod_compress_cmd = xz
 868   endif # CONFIG_MODULE_COMPRESS_XZ
 869 endif # CONFIG_MODULE_COMPRESS
 870 export mod_compress_cmd
 871
 872 # Select initial ramdisk compression format, default is gzip(1).
 873 # This shall be used by the dracut(8) tool while creating an initramfs image.
 874 #
 875 INITRD_COMPRESS-y                  := gzip
 876 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 877 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 878 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 879 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 880 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 881 # do not export INITRD_COMPRESS, since we didn't actually
 882 # choose a sane default compression above.
 883 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 884
 885 ifdef CONFIG_MODULE_SIG_ALL
 886 MODSECKEY = ./signing_key.priv
 887 MODPUBKEY = ./signing_key.x509
 888 export MODPUBKEY
 889 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 890 else
 891 mod_sign_cmd = true
 892 endif
 893 export mod_sign_cmd
 894
 895
 896 ifeq ($(KBUILD_EXTMOD),)
 897 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 898
 899 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 900                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 901                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 902
 903 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 904                      $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
 905
 906 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 907 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 908 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 909 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 910 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 911 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 912 libs-y          := $(libs-y1) $(libs-y2)
 913
 914 # Externally visible symbols (used by link-vmlinux.sh)
 915 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 916 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 917 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 918 export LDFLAGS_vmlinux
 919 # used by scripts/pacmage/Makefile
 920 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 921
 922 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 923
 924 # Final link of vmlinux
 925       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 926 quiet_cmd_link-vmlinux = LINK    $@
 927
 928 # Include targets which we want to
 929 # execute if the rest of the kernel build went well.
 930 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 931 ifdef CONFIG_HEADERS_CHECK
 932         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 933 endif
 934 ifdef CONFIG_SAMPLES
 935         $(Q)$(MAKE) $(build)=samples
 936 endif
 937 ifdef CONFIG_BUILD_DOCSRC
 938         $(Q)$(MAKE) $(build)=Documentation
 939 endif
 940 ifdef CONFIG_GDB_SCRIPTS
 941         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 942 endif
 943         +$(call if_changed,link-vmlinux)
 944
 945 # The actual objects are generated when descending,
 946 # make sure no implicit rule kicks in
 947 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 948
 949 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 950 # Preset locale variables to speed up the build process. Limit locale
 951 # tweaks to this spot to avoid wrong language settings when running
 952 # make menuconfig etc.
 953 # Error messages still appears in the original language
 954
 955 PHONY += $(vmlinux-dirs)
 956 $(vmlinux-dirs): prepare scripts
 957         $(Q)$(MAKE) $(build)=$@
 958
 959 define filechk_kernel.release
 960         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 961 endef
 962
 963 # Store (new) KERNELRELEASE string in include/config/kernel.release
 964 include/config/kernel.release: include/config/auto.conf FORCE
 965         $(call filechk,kernel.release)
 966
 967
 968 # Things we need to do before we recursively start building the kernel
 969 # or the modules are listed in "prepare".
 970 # A multi level approach is used. prepareN is processed before prepareN-1.
 971 # archprepare is used in arch Makefiles and when processed asm symlink,
 972 # version.h and scripts_basic is processed / created.
 973
 974 # Listed in dependency order
 975 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 976
 977 # prepare3 is used to check if we are building in a separate output directory,
 978 # and if so do:
 979 # 1) Check that make has not been executed in the kernel src $(srctree)
 980 prepare3: include/config/kernel.release
 981 ifneq ($(KBUILD_SRC),)
 982         @$(kecho) '  Using $(srctree) as source for kernel'
 983         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 984                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 985                 echo >&2 "  in the '$(srctree)' directory.";\
 986                 /bin/false; \
 987         fi;
 988 endif
 989
 990 # prepare2 creates a makefile if using a separate output directory
 991 prepare2: prepare3 outputmakefile asm-generic
 992
 993 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 994                    include/config/auto.conf
 995         $(cmd_crmodverdir)
 996
 997 archprepare: archheaders archscripts prepare1 scripts_basic
 998
 999 prepare0: archprepare FORCE
1000         $(Q)$(MAKE) $(build)=.
1001
1002 # All the preparing..
1003 prepare: prepare0
1004
1005 # Generate some files
1006 # ---------------------------------------------------------------------------
1007
1008 # KERNELRELEASE can change from a few different places, meaning version.h
1009 # needs to be updated, so this check is forced on all builds
1010
1011 uts_len := 64
1012 define filechk_utsrelease.h
1013         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1014           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1015           exit 1;                                                         \
1016         fi;                                                               \
1017         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1018 endef
1019
1020 define filechk_version.h
1021         (echo \#define LINUX_VERSION_CODE $(shell                         \
1022         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1023         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1024 endef
1025
1026 $(version_h): $(srctree)/Makefile FORCE
1027         $(call filechk,version.h)
1028         $(Q)rm -f $(old_version_h)
1029
1030 include/generated/utsrelease.h: include/config/kernel.release FORCE
1031         $(call filechk,utsrelease.h)
1032
1033 PHONY += headerdep
1034 headerdep:
1035         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1036         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1037
1038 # ---------------------------------------------------------------------------
1039 # Firmware install
1040 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1041 export INSTALL_FW_PATH
1042
1043 PHONY += firmware_install
1044 firmware_install: FORCE
1045         @mkdir -p $(objtree)/firmware
1046         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1047
1048 # ---------------------------------------------------------------------------
1049 # Kernel headers
1050
1051 #Default location for installed headers
1052 export INSTALL_HDR_PATH = $(objtree)/usr
1053
1054 # If we do an all arch process set dst to asm-$(hdr-arch)
1055 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1056
1057 PHONY += archheaders
1058 archheaders:
1059
1060 PHONY += archscripts
1061 archscripts:
1062
1063 PHONY += __headers
1064 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1065         $(Q)$(MAKE) $(build)=scripts build_unifdef
1066
1067 PHONY += headers_install_all
1068 headers_install_all:
1069         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1070
1071 PHONY += headers_install
1072 headers_install: __headers
1073         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1074           $(error Headers not exportable for the $(SRCARCH) architecture))
1075         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1076         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1077
1078 PHONY += headers_check_all
1079 headers_check_all: headers_install_all
1080         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1081
1082 PHONY += headers_check
1083 headers_check: headers_install
1084         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1085         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1086
1087 # ---------------------------------------------------------------------------
1088 # Kernel selftest
1089
1090 PHONY += kselftest
1091 kselftest:
1092         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1093
1094 # ---------------------------------------------------------------------------
1095 # Modules
1096
1097 ifdef CONFIG_MODULES
1098
1099 # By default, build modules as well
1100
1101 all: modules
1102
1103 # Build modules
1104 #
1105 # A module can be listed more than once in obj-m resulting in
1106 # duplicate lines in modules.order files.  Those are removed
1107 # using awk while concatenating to the final file.
1108
1109 PHONY += modules
1110 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1111         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1112         @$(kecho) '  Building modules, stage 2.';
1113         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1114         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1115
1116 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1117         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1118
1119 %/modules.builtin: include/config/auto.conf
1120         $(Q)$(MAKE) $(modbuiltin)=$*
1121
1122
1123 # Target to prepare building external modules
1124 PHONY += modules_prepare
1125 modules_prepare: prepare scripts
1126
1127 # Target to install modules
1128 PHONY += modules_install
1129 modules_install: _modinst_ _modinst_post
1130
1131 PHONY += _modinst_
1132 _modinst_:
1133         @rm -rf $(MODLIB)/kernel
1134         @rm -f $(MODLIB)/source
1135         @mkdir -p $(MODLIB)/kernel
1136         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1137         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1138                 rm -f $(MODLIB)/build ; \
1139                 ln -s $(CURDIR) $(MODLIB)/build ; \
1140         fi
1141         @cp -f $(objtree)/modules.order $(MODLIB)/
1142         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1143         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1144
1145 # This depmod is only for convenience to give the initial
1146 # boot a modules.dep even before / is mounted read-write.  However the
1147 # boot script depmod is the master version.
1148 PHONY += _modinst_post
1149 _modinst_post: _modinst_
1150         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1151         $(call cmd,depmod)
1152
1153 ifeq ($(CONFIG_MODULE_SIG), y)
1154 PHONY += modules_sign
1155 modules_sign:
1156         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1157 endif
1158
1159 else # CONFIG_MODULES
1160
1161 # Modules not configured
1162 # ---------------------------------------------------------------------------
1163
1164 modules modules_install: FORCE
1165         @echo >&2
1166         @echo >&2 "The present kernel configuration has modules disabled."
1167         @echo >&2 "Type 'make config' and enable loadable module support."
1168         @echo >&2 "Then build a kernel with module support enabled."
1169         @echo >&2
1170         @exit 1
1171
1172 endif # CONFIG_MODULES
1173
1174 ###
1175 # Cleaning is done on three levels.
1176 # make clean     Delete most generated files
1177 #                Leave enough to build external modules
1178 # make mrproper  Delete the current configuration, and all generated files
1179 # make distclean Remove editor backup files, patch leftover files and the like
1180
1181 # Directories & files removed with 'make clean'
1182 CLEAN_DIRS  += $(MODVERDIR)
1183
1184 # Directories & files removed with 'make mrproper'
1185 MRPROPER_DIRS  += include/config usr/include include/generated          \
1186                   arch/*/include/generated .tmp_objdiff
1187 MRPROPER_FILES += .config .config.old .version .old_version \
1188                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1189                   signing_key.priv signing_key.x509 x509.genkey         \
1190                   extra_certificates signing_key.x509.keyid             \
1191                   signing_key.x509.signer vmlinux-gdb.py
1192
1193 # clean - Delete most, but leave enough to build external modules
1194 #
1195 clean: rm-dirs  := $(CLEAN_DIRS)
1196 clean: rm-files := $(CLEAN_FILES)
1197 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1198
1199 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1200 $(clean-dirs):
1201         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1202
1203 vmlinuxclean:
1204         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1205
1206 clean: archclean vmlinuxclean
1207
1208 # mrproper - Delete all generated files, including .config
1209 #
1210 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1211 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1212 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1213
1214 PHONY += $(mrproper-dirs) mrproper archmrproper
1215 $(mrproper-dirs):
1216         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1217
1218 mrproper: clean archmrproper $(mrproper-dirs)
1219         $(call cmd,rmdirs)
1220         $(call cmd,rmfiles)
1221
1222 # distclean
1223 #
1224 PHONY += distclean
1225
1226 distclean: mrproper
1227         @find $(srctree) $(RCS_FIND_IGNORE) \
1228                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1229                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1230                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1231                 -type f -print | xargs rm -f
1232
1233
1234 # Packaging of the kernel to various formats
1235 # ---------------------------------------------------------------------------
1236 # rpm target kept for backward compatibility
1237 package-dir     := scripts/package
1238
1239 %src-pkg: FORCE
1240         $(Q)$(MAKE) $(build)=$(package-dir) $@
1241 %pkg: include/config/kernel.release FORCE
1242         $(Q)$(MAKE) $(build)=$(package-dir) $@
1243 rpm: include/config/kernel.release FORCE
1244         $(Q)$(MAKE) $(build)=$(package-dir) $@
1245
1246
1247 # Brief documentation of the typical targets used
1248 # ---------------------------------------------------------------------------
1249
1250 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1251 boards := $(sort $(notdir $(boards)))
1252 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1253 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1254
1255 help:
1256         @echo  'Cleaning targets:'
1257         @echo  '  clean           - Remove most generated files but keep the config and'
1258         @echo  '                    enough build support to build external modules'
1259         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1260         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1261         @echo  ''
1262         @echo  'Configuration targets:'
1263         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1264         @echo  ''
1265         @echo  'Other generic targets:'
1266         @echo  '  all             - Build all targets marked with [*]'
1267         @echo  '* vmlinux         - Build the bare kernel'
1268         @echo  '* modules         - Build all modules'
1269         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1270         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1271         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1272         @echo  '  dir/            - Build all files in dir and below'
1273         @echo  '  dir/file.[oisS] - Build specified target only'
1274         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1275         @echo  '                    (requires a recent binutils and recent build (System.map))'
1276         @echo  '  dir/file.ko     - Build module including final link'
1277         @echo  '  modules_prepare - Set up for building external modules'
1278         @echo  '  tags/TAGS       - Generate tags file for editors'
1279         @echo  '  cscope          - Generate cscope index'
1280         @echo  '  gtags           - Generate GNU GLOBAL index'
1281         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1282         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1283         @echo  '  image_name      - Output the image name (use with make -s)'
1284         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1285          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1286          echo  ''
1287         @echo  'Static analysers'
1288         @echo  '  checkstack      - Generate a list of stack hogs'
1289         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1290         @echo  '  versioncheck    - Sanity check on version.h usage'
1291         @echo  '  includecheck    - Check for duplicate included header files'
1292         @echo  '  export_report   - List the usages of all exported symbols'
1293         @echo  '  headers_check   - Sanity check on exported headers'
1294         @echo  '  headerdep       - Detect inclusion cycles in headers'
1295         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1296         @echo  ''
1297         @echo  'Kernel selftest'
1298         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1299         @echo  '                    Build, install, and boot kernel before'
1300         @echo  '                    running kselftest on it'
1301         @echo  ''
1302         @echo  'Kernel packaging:'
1303         @$(MAKE) $(build)=$(package-dir) help
1304         @echo  ''
1305         @echo  'Documentation targets:'
1306         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1307         @echo  ''
1308         @echo  'Architecture specific targets ($(SRCARCH)):'
1309         @$(if $(archhelp),$(archhelp),\
1310                 echo '  No architecture specific help defined for $(SRCARCH)')
1311         @echo  ''
1312         @$(if $(boards), \
1313                 $(foreach b, $(boards), \
1314                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1315                 echo '')
1316         @$(if $(board-dirs), \
1317                 $(foreach b, $(board-dirs), \
1318                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1319                 printf "  %-16s - Show all of the above\\n" help-boards; \
1320                 echo '')
1321
1322         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1323         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1324         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1325         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1326         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1327         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1328         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1329         @echo  '                1: warnings which may be relevant and do not occur too often'
1330         @echo  '                2: warnings which occur quite often but may still be relevant'
1331         @echo  '                3: more obscure warnings, can most likely be ignored'
1332         @echo  '                Multiple levels can be combined with W=12 or W=123'
1333         @echo  ''
1334         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1335         @echo  'For further info see the ./README file'
1336
1337
1338 help-board-dirs := $(addprefix help-,$(board-dirs))
1339
1340 help-boards: $(help-board-dirs)
1341
1342 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1343
1344 $(help-board-dirs): help-%:
1345         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1346         @$(if $(boards-per-dir), \
1347                 $(foreach b, $(boards-per-dir), \
1348                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1349                 echo '')
1350
1351
1352 # Documentation targets
1353 # ---------------------------------------------------------------------------
1354 %docs: scripts_basic FORCE
1355         $(Q)$(MAKE) $(build)=scripts build_docproc
1356         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1357
1358 else # KBUILD_EXTMOD
1359
1360 ###
1361 # External module support.
1362 # When building external modules the kernel used as basis is considered
1363 # read-only, and no consistency checks are made and the make
1364 # system is not used on the basis kernel. If updates are required
1365 # in the basis kernel ordinary make commands (without M=...) must
1366 # be used.
1367 #
1368 # The following are the only valid targets when building external
1369 # modules.
1370 # make M=dir clean     Delete all automatically generated files
1371 # make M=dir modules   Make all modules in specified dir
1372 # make M=dir           Same as 'make M=dir modules'
1373 # make M=dir modules_install
1374 #                      Install the modules built in the module directory
1375 #                      Assumes install directory is already created
1376
1377 # We are always building modules
1378 KBUILD_MODULES := 1
1379 PHONY += crmodverdir
1380 crmodverdir:
1381         $(cmd_crmodverdir)
1382
1383 PHONY += $(objtree)/Module.symvers
1384 $(objtree)/Module.symvers:
1385         @test -e $(objtree)/Module.symvers || ( \
1386         echo; \
1387         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1388         echo "           is missing; modules will have no dependencies and modversions."; \
1389         echo )
1390
1391 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1392 PHONY += $(module-dirs) modules
1393 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1394         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1395
1396 modules: $(module-dirs)
1397         @$(kecho) '  Building modules, stage 2.';
1398         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1399
1400 PHONY += modules_install
1401 modules_install: _emodinst_ _emodinst_post
1402
1403 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1404 PHONY += _emodinst_
1405 _emodinst_:
1406         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1407         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1408
1409 PHONY += _emodinst_post
1410 _emodinst_post: _emodinst_
1411         $(call cmd,depmod)
1412
1413 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1414
1415 PHONY += $(clean-dirs) clean
1416 $(clean-dirs):
1417         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1418
1419 clean:  rm-dirs := $(MODVERDIR)
1420 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1421
1422 help:
1423         @echo  '  Building external modules.'
1424         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1425         @echo  ''
1426         @echo  '  modules         - default target, build the module(s)'
1427         @echo  '  modules_install - install the module'
1428         @echo  '  clean           - remove generated files in module directory only'
1429         @echo  ''
1430
1431 # Dummies...
1432 PHONY += prepare scripts
1433 prepare: ;
1434 scripts: ;
1435 endif # KBUILD_EXTMOD
1436
1437 clean: $(clean-dirs)
1438         $(call cmd,rmdirs)
1439         $(call cmd,rmfiles)
1440         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1441                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1442                 -o -name '*.ko.*' \
1443                 -o -name '*.dwo'  \
1444                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1445                 -o -name '*.symtypes' -o -name 'modules.order' \
1446                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1447                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1448
1449 # Generate tags for editors
1450 # ---------------------------------------------------------------------------
1451 quiet_cmd_tags = GEN     $@
1452       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1453
1454 tags TAGS cscope gtags: FORCE
1455         $(call cmd,tags)
1456
1457 # Scripts to check various things for consistency
1458 # ---------------------------------------------------------------------------
1459
1460 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1461
1462 includecheck:
1463         find $(srctree)/* $(RCS_FIND_IGNORE) \
1464                 -name '*.[hcS]' -type f -print | sort \
1465                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1466
1467 versioncheck:
1468         find $(srctree)/* $(RCS_FIND_IGNORE) \
1469                 -name '*.[hcS]' -type f -print | sort \
1470                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1471
1472 coccicheck:
1473         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1474
1475 namespacecheck:
1476         $(PERL) $(srctree)/scripts/namespace.pl
1477
1478 export_report:
1479         $(PERL) $(srctree)/scripts/export_report.pl
1480
1481 endif #ifeq ($(config-targets),1)
1482 endif #ifeq ($(mixed-targets),1)
1483
1484 PHONY += checkstack kernelrelease kernelversion image_name
1485
1486 # UML needs a little special treatment here.  It wants to use the host
1487 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1488 # else wants $(ARCH), including people doing cross-builds, which means
1489 # that $(SUBARCH) doesn't work here.
1490 ifeq ($(ARCH), um)
1491 CHECKSTACK_ARCH := $(SUBARCH)
1492 else
1493 CHECKSTACK_ARCH := $(ARCH)
1494 endif
1495 checkstack:
1496         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1497         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1498
1499 kernelrelease:
1500         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1501
1502 kernelversion:
1503         @echo $(KERNELVERSION)
1504
1505 image_name:
1506         @echo $(KBUILD_IMAGE)
1507
1508 # Clear a bunch of variables before executing the submake
1509 tools/: FORCE
1510         $(Q)mkdir -p $(objtree)/tools
1511         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1512
1513 tools/%: FORCE
1514         $(Q)mkdir -p $(objtree)/tools
1515         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1516
1517 # Single targets
1518 # ---------------------------------------------------------------------------
1519 # Single targets are compatible with:
1520 # - build with mixed source and output
1521 # - build with separate output dir 'make O=...'
1522 # - external modules
1523 #
1524 #  target-dir => where to store outputfile
1525 #  build-dir  => directory in kernel source tree to use
1526
1527 ifeq ($(KBUILD_EXTMOD),)
1528         build-dir  = $(patsubst %/,%,$(dir $@))
1529         target-dir = $(dir $@)
1530 else
1531         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1532         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1533         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1534 endif
1535
1536 %.s: %.c prepare scripts FORCE
1537         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1538 %.i: %.c prepare scripts FORCE
1539         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1540 %.o: %.c prepare scripts FORCE
1541         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1542 %.lst: %.c prepare scripts FORCE
1543         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1544 %.s: %.S prepare scripts FORCE
1545         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1546 %.o: %.S prepare scripts FORCE
1547         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1548 %.symtypes: %.c prepare scripts FORCE
1549         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1550
1551 # Modules
1552 /: prepare scripts FORCE
1553         $(cmd_crmodverdir)
1554         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1555         $(build)=$(build-dir)
1556 # Make sure the latest headers are built for Documentation
1557 Documentation/: headers_install
1558 %/: prepare scripts FORCE
1559         $(cmd_crmodverdir)
1560         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1561         $(build)=$(build-dir)
1562 %.ko: prepare scripts FORCE
1563         $(cmd_crmodverdir)
1564         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1565         $(build)=$(build-dir) $(@:.ko=.o)
1566         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1567
1568 # FIXME Should go into a make.lib or something
1569 # ===========================================================================
1570
1571 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1572       cmd_rmdirs = rm -rf $(rm-dirs)
1573
1574 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1575       cmd_rmfiles = rm -f $(rm-files)
1576
1577 # Run depmod only if we have System.map and depmod is executable
1578 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1579       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1580                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1581
1582 # Create temporary dir for module support files
1583 # clean it up only when building all modules
1584 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1585                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1586
1587 # read all saved command lines
1588
1589 targets := $(wildcard $(sort $(targets)))
1590 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1591
1592 ifneq ($(cmd_files),)
1593   $(cmd_files): ;       # Do not try to update included dependency files
1594   include $(cmd_files)
1595 endif
1596
1597 endif   # skip-makefile
1598
1599 PHONY += FORCE
1600 FORCE:
1601
1602 # Declare the contents of the .PHONY variable as phony.  We keep that
1603 # information in a variable so we can use it in if_changed and friends.
1604 .PHONY: $(PHONY)