Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 10
   3 SUBLEVEL = 16
   4 EXTRAVERSION =
   5 NAME = Fearless Coyote
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # o Do not use make's built-in rules and variables
  14 #   (this increases performance and avoids hard-to-debug behaviour);
  15 # o Look for make include files relative to root of kernel src
  16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  17
  18 # Avoid funny character set dependencies
  19 unexport LC_ALL
  20 LC_COLLATE=C
  21 LC_NUMERIC=C
  22 export LC_COLLATE LC_NUMERIC
  23
  24 # Avoid interference with shell env settings
  25 unexport GREP_OPTIONS
  26
  27 # We are using a recursive build, so we need to do a little thinking
  28 # to get the ordering right.
  29 #
  30 # Most importantly: sub-Makefiles should only ever modify files in
  31 # their own directory. If in some directory we have a dependency on
  32 # a file in another dir (which doesn't happen often, but it's often
  33 # unavoidable when linking the built-in.o targets which finally
  34 # turn into vmlinux), we will call a sub make in that other dir, and
  35 # after that we are sure that everything which is in that other dir
  36 # is now up to date.
  37 #
  38 # The only cases where we need to modify files which have global
  39 # effects are thus separated out and done before the recursive
  40 # descending is started. They are now explicitly listed as the
  41 # prepare rule.
  42
  43 # Beautify output
  44 # ---------------------------------------------------------------------------
  45 #
  46 # Normally, we echo the whole command before executing it. By making
  47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  48 # $(quiet) to choose other forms of output instead, e.g.
  49 #
  50 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  51 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  52 #
  53 # If $(quiet) is empty, the whole command will be printed.
  54 # If it is set to "quiet_", only the short version will be printed.
  55 # If it is set to "silent_", nothing will be printed at all, since
  56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  57 #
  58 # A simple variant is to prefix commands with $(Q) - that's useful
  59 # for commands that shall be hidden in non-verbose mode.
  60 #
  61 #       $(Q)ln $@ :<
  62 #
  63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  65 #
  66 # To put more focus on warnings, be less verbose as default
  67 # Use 'make V=1' to see the full commands
  68
  69 ifeq ("$(origin V)", "command line")
  70   KBUILD_VERBOSE = $(V)
  71 endif
  72 ifndef KBUILD_VERBOSE
  73   KBUILD_VERBOSE = 0
  74 endif
  75
  76 ifeq ($(KBUILD_VERBOSE),1)
  77   quiet =
  78   Q =
  79 else
  80   quiet=quiet_
  81   Q = @
  82 endif
  83
  84 # If the user is running make -s (silent mode), suppress echoing of
  85 # commands
  86
  87 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  89   quiet=silent_
  90 endif
  91 else                                    # make-3.8x
  92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  93   quiet=silent_
  94 endif
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is set on invocation of make in OBJ directory
 115 # KBUILD_SRC is not intended to be used by the regular user (for now)
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # That's our default target when none is given on the command line
 125 PHONY := _all
 126 _all:
 127
 128 # Cancel implicit rules on top Makefile
 129 $(CURDIR)/Makefile Makefile: ;
 130
 131 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 132   $(error main directory cannot contain spaces nor colons)
 133 endif
 134
 135 ifneq ($(KBUILD_OUTPUT),)
 136 # Invoke a second make in the output directory, passing relevant variables
 137 # check that the output directory actually exists
 138 saved-output := $(KBUILD_OUTPUT)
 139 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 140                                                                 && /bin/pwd)
 141 $(if $(KBUILD_OUTPUT),, \
 142      $(error failed to create output directory "$(saved-output)"))
 143
 144 PHONY += $(MAKECMDGOALS) sub-make
 145
 146 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 147         @:
 148
 149 sub-make:
 150         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 151         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 152
 153 # Leave processing to above invocation of make
 154 skip-makefile := 1
 155 endif # ifneq ($(KBUILD_OUTPUT),)
 156 endif # ifeq ($(KBUILD_SRC),)
 157
 158 # We process the rest of the Makefile if this is the final invocation of make
 159 ifeq ($(skip-makefile),)
 160
 161 # Do not print "Entering directory ...",
 162 # but we want to display it when entering to the output directory
 163 # so that IDEs/editors are able to understand relative filenames.
 164 MAKEFLAGS += --no-print-directory
 165
 166 # Call a source code checker (by default, "sparse") as part of the
 167 # C compilation.
 168 #
 169 # Use 'make C=1' to enable checking of only re-compiled files.
 170 # Use 'make C=2' to enable checking of *all* source files, regardless
 171 # of whether they are re-compiled or not.
 172 #
 173 # See the file "Documentation/sparse.txt" for more details, including
 174 # where to get the "sparse" utility.
 175
 176 ifeq ("$(origin C)", "command line")
 177   KBUILD_CHECKSRC = $(C)
 178 endif
 179 ifndef KBUILD_CHECKSRC
 180   KBUILD_CHECKSRC = 0
 181 endif
 182
 183 # Call message checker as part of the C compilation
 184 #
 185 # Use 'make D=1' to enable checking
 186 # Use 'make D=2' to create the message catalog
 187
 188 ifdef D
 189   ifeq ("$(origin D)", "command line")
 190     KBUILD_KMSG_CHECK = $(D)
 191   endif
 192 endif
 193 ifndef KBUILD_KMSG_CHECK
 194   KBUILD_KMSG_CHECK = 0
 195 endif
 196
 197 # Use make M=dir to specify directory of external module to build
 198 # Old syntax make ... SUBDIRS=$PWD is still supported
 199 # Setting the environment variable KBUILD_EXTMOD take precedence
 200 ifdef SUBDIRS
 201   KBUILD_EXTMOD ?= $(SUBDIRS)
 202 endif
 203
 204 ifeq ("$(origin M)", "command line")
 205   KBUILD_EXTMOD := $(M)
 206 endif
 207
 208 # If building an external module we do not care about the all: rule
 209 # but instead _all depend on modules
 210 PHONY += all
 211 ifeq ($(KBUILD_EXTMOD),)
 212 _all: all
 213 else
 214 _all: modules
 215 endif
 216
 217 ifeq ($(KBUILD_SRC),)
 218         # building in the source tree
 219         srctree := .
 220 else
 221         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 222                 # building in a subdirectory of the source tree
 223                 srctree := ..
 224         else
 225                 srctree := $(KBUILD_SRC)
 226         endif
 227 endif
 228 objtree         := .
 229 src             := $(srctree)
 230 obj             := $(objtree)
 231
 232 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 233
 234 export srctree objtree VPATH
 235
 236 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 237 # first, and if a usermode build is happening, the "ARCH=um" on the command
 238 # line overrides the setting of ARCH below.  If a native build is happening,
 239 # then ARCH is assigned, getting whatever value it gets normally, and
 240 # SUBARCH is subsequently ignored.
 241
 242 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 243                                   -e s/sun4u/sparc64/ \
 244                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 245                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 246                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 247                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 248
 249 # Cross compiling and selecting different set of gcc/bin-utils
 250 # ---------------------------------------------------------------------------
 251 #
 252 # When performing cross compilation for other architectures ARCH shall be set
 253 # to the target architecture. (See arch/* for the possibilities).
 254 # ARCH can be set during invocation of make:
 255 # make ARCH=ia64
 256 # Another way is to have ARCH set in the environment.
 257 # The default ARCH is the host where make is executed.
 258
 259 # CROSS_COMPILE specify the prefix used for all executables used
 260 # during compilation. Only gcc and related bin-utils executables
 261 # are prefixed with $(CROSS_COMPILE).
 262 # CROSS_COMPILE can be set on the command line
 263 # make CROSS_COMPILE=ia64-linux-
 264 # Alternatively CROSS_COMPILE can be set in the environment.
 265 # A third alternative is to store a setting in .config so that plain
 266 # "make" in the configured kernel build directory always uses that.
 267 # Default value for CROSS_COMPILE is not to prefix executables
 268 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 269 ARCH            ?= $(SUBARCH)
 270 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 271
 272 # Architecture as present in compile.h
 273 UTS_MACHINE     := $(ARCH)
 274 SRCARCH         := $(ARCH)
 275
 276 # Additional ARCH settings for x86
 277 ifeq ($(ARCH),i386)
 278         SRCARCH := x86
 279 endif
 280 ifeq ($(ARCH),x86_64)
 281         SRCARCH := x86
 282 endif
 283
 284 # Additional ARCH settings for sparc
 285 ifeq ($(ARCH),sparc32)
 286        SRCARCH := sparc
 287 endif
 288 ifeq ($(ARCH),sparc64)
 289        SRCARCH := sparc
 290 endif
 291
 292 # Additional ARCH settings for sh
 293 ifeq ($(ARCH),sh64)
 294        SRCARCH := sh
 295 endif
 296
 297 # Additional ARCH settings for tile
 298 ifeq ($(ARCH),tilepro)
 299        SRCARCH := tile
 300 endif
 301 ifeq ($(ARCH),tilegx)
 302        SRCARCH := tile
 303 endif
 304
 305 # Where to locate arch specific headers
 306 hdr-arch  := $(SRCARCH)
 307
 308 KCONFIG_CONFIG  ?= .config
 309 export KCONFIG_CONFIG
 310
 311 # SHELL used by kbuild
 312 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 313           else if [ -x /bin/bash ]; then echo /bin/bash; \
 314           else echo sh; fi ; fi)
 315
 316 HOSTCC       = gcc
 317 HOSTCXX      = g++
 318 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 319 HOSTCXXFLAGS = -O2
 320
 321 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 322 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 323                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 324 endif
 325
 326 # Decide whether to build built-in, modular, or both.
 327 # Normally, just do built-in.
 328
 329 KBUILD_MODULES :=
 330 KBUILD_BUILTIN := 1
 331
 332 # If we have only "make modules", don't compile built-in objects.
 333 # When we're building modules with modversions, we need to consider
 334 # the built-in objects during the descend as well, in order to
 335 # make sure the checksums are up to date before we record them.
 336
 337 ifeq ($(MAKECMDGOALS),modules)
 338   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 339 endif
 340
 341 # If we have "make <whatever> modules", compile modules
 342 # in addition to whatever we do anyway.
 343 # Just "make" or "make all" shall build modules as well
 344
 345 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 346   KBUILD_MODULES := 1
 347 endif
 348
 349 ifeq ($(MAKECMDGOALS),)
 350   KBUILD_MODULES := 1
 351 endif
 352
 353 export KBUILD_MODULES KBUILD_BUILTIN
 354 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 355
 356 # We need some generic definitions (do not try to remake the file).
 357 scripts/Kbuild.include: ;
 358 include scripts/Kbuild.include
 359
 360 # Make variables (CC, etc...)
 361 AS              = $(CROSS_COMPILE)as
 362 LD              = $(CROSS_COMPILE)ld
 363 CC              = $(CROSS_COMPILE)gcc
 364 CPP             = $(CC) -E
 365 AR              = $(CROSS_COMPILE)ar
 366 NM              = $(CROSS_COMPILE)nm
 367 STRIP           = $(CROSS_COMPILE)strip
 368 OBJCOPY         = $(CROSS_COMPILE)objcopy
 369 OBJDUMP         = $(CROSS_COMPILE)objdump
 370 AWK             = awk
 371 GENKSYMS        = scripts/genksyms/genksyms
 372 INSTALLKERNEL  := installkernel
 373 DEPMOD          = /sbin/depmod
 374 PERL            = perl
 375 PYTHON          = python
 376 CHECK           = sparse
 377
 378 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 379                   -Wbitwise -Wno-return-void $(CF)
 380 KMSG_CHECK      = $(srctree)/scripts/kmsg-doc
 381 NOSTDINC_FLAGS  =
 382 CFLAGS_MODULE   =
 383 AFLAGS_MODULE   =
 384 LDFLAGS_MODULE  =
 385 CFLAGS_KERNEL   =
 386 AFLAGS_KERNEL   =
 387 LDFLAGS_vmlinux =
 388 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 389 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 390
 391 # Prefer linux-backports-modules
 392 ifneq ($(KBUILD_SRC),)
 393 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
 394 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
 395 endif
 396 endif
 397
 398 # Use USERINCLUDE when you must reference the UAPI directories only.
 399 USERINCLUDE    := \
 400                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 401                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 402                 -I$(srctree)/include/uapi \
 403                 -I$(objtree)/include/generated/uapi \
 404                 -include $(srctree)/include/linux/kconfig.h
 405
 406 # Use LINUXINCLUDE when you must reference the include/ directory.
 407 # Needed to be compatible with the O= option
 408 LINUXINCLUDE    := \
 409                 $(UBUNTUINCLUDE) \
 410                 -I$(srctree)/arch/$(hdr-arch)/include \
 411                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 412                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 413                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 414                 -I$(objtree)/include
 415
 416 LINUXINCLUDE    += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
 417
 418 # UBUNTU: Include our third party driver stuff too
 419 LINUXINCLUDE   += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
 420
 421 KBUILD_CPPFLAGS := -D__KERNEL__
 422
 423 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 424                    -fno-strict-aliasing -fno-common \
 425                    -Werror-implicit-function-declaration \
 426                    -Wno-format-security \
 427                    -std=gnu89 $(call cc-option,-fno-PIE)
 428
 429
 430 KBUILD_AFLAGS_KERNEL :=
 431 KBUILD_CFLAGS_KERNEL :=
 432 KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
 433 KBUILD_AFLAGS_MODULE  := -DMODULE
 434 KBUILD_CFLAGS_MODULE  := -DMODULE
 435 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 436
 437 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 438 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 439 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 440
 441 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 442 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 443 export CPP AR NM STRIP OBJCOPY OBJDUMP
 444 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 445 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 446
 447 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 448 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
 449 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 450 export KBUILD_KMSG_CHECK KMSG_CHECK
 451 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 452 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 453 export KBUILD_ARFLAGS
 454
 455 # When compiling out-of-tree modules, put MODVERDIR in the module
 456 # tree rather than in the kernel tree. The kernel tree might
 457 # even be read-only.
 458 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 459
 460 # Files to ignore in find ... statements
 461
 462 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 463                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 464                           -prune -o
 465 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 466                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 467
 468 # ===========================================================================
 469 # Rules shared between *config targets and build targets
 470
 471 # Basic helpers built in scripts/
 472 PHONY += scripts_basic
 473 scripts_basic:
 474         $(Q)$(MAKE) $(build)=scripts/basic
 475         $(Q)rm -f .tmp_quiet_recordmcount
 476
 477 # To avoid any implicit rule to kick in, define an empty command.
 478 scripts/basic/%: scripts_basic ;
 479
 480 PHONY += outputmakefile
 481 # outputmakefile generates a Makefile in the output directory, if using a
 482 # separate output directory. This allows convenient use of make in the
 483 # output directory.
 484 outputmakefile:
 485 ifneq ($(KBUILD_SRC),)
 486         $(Q)ln -fsn $(srctree) source
 487         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 488             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 489 endif
 490
 491 # Support for using generic headers in asm-generic
 492 PHONY += asm-generic
 493 asm-generic:
 494         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 495                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 496         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 497                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 498
 499 # To make sure we do not include .config for any of the *config targets
 500 # catch them early, and hand them over to scripts/kconfig/Makefile
 501 # It is allowed to specify more targets when calling make, including
 502 # mixing *config targets and build targets.
 503 # For example 'make oldconfig all'.
 504 # Detect when mixed targets is specified, and make a second invocation
 505 # of make so .config is not included in this case either (for *config).
 506
 507 version_h := include/generated/uapi/linux/version.h
 508 old_version_h := include/linux/version.h
 509
 510 no-dot-config-targets := clean mrproper distclean \
 511                          cscope gtags TAGS tags help% %docs check% coccicheck \
 512                          $(version_h) headers_% archheaders archscripts \
 513                          kernelversion %src-pkg
 514
 515 config-targets := 0
 516 mixed-targets  := 0
 517 dot-config     := 1
 518
 519 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 520         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 521                 dot-config := 0
 522         endif
 523 endif
 524
 525 ifeq ($(KBUILD_EXTMOD),)
 526         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 527                 config-targets := 1
 528                 ifneq ($(words $(MAKECMDGOALS)),1)
 529                         mixed-targets := 1
 530                 endif
 531         endif
 532 endif
 533 # install and module_install need also be processed one by one
 534 ifneq ($(filter install,$(MAKECMDGOALS)),)
 535         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 536                 mixed-targets := 1
 537         endif
 538 endif
 539
 540 ifeq ($(mixed-targets),1)
 541 # ===========================================================================
 542 # We're called with mixed targets (*config and build targets).
 543 # Handle them one by one.
 544
 545 PHONY += $(MAKECMDGOALS) __build_one_by_one
 546
 547 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 548         @:
 549
 550 __build_one_by_one:
 551         $(Q)set -e; \
 552         for i in $(MAKECMDGOALS); do \
 553                 $(MAKE) -f $(srctree)/Makefile $$i; \
 554         done
 555
 556 else
 557 ifeq ($(config-targets),1)
 558 # ===========================================================================
 559 # *config targets only - make sure prerequisites are updated, and descend
 560 # in scripts/kconfig to make the *config target
 561
 562 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 563 # KBUILD_DEFCONFIG may point out an alternative default configuration
 564 # used for 'make defconfig'
 565 include arch/$(SRCARCH)/Makefile
 566 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 567
 568 config: scripts_basic outputmakefile FORCE
 569         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 570
 571 %config: scripts_basic outputmakefile FORCE
 572         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 573
 574 else
 575 # ===========================================================================
 576 # Build targets only - this includes vmlinux, arch specific targets, clean
 577 # targets and others. In general all targets except *config targets.
 578
 579 ifeq ($(KBUILD_EXTMOD),)
 580 # Additional helpers built in scripts/
 581 # Carefully list dependencies so we do not try to build scripts twice
 582 # in parallel
 583 PHONY += scripts
 584 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 585          asm-generic gcc-plugins
 586         $(Q)$(MAKE) $(build)=$(@)
 587
 588 # Objects we will link into vmlinux / subdirs we need to visit
 589 init-y          := init/
 590 drivers-y       := drivers/ sound/ firmware/ ubuntu/
 591 net-y           := net/
 592 libs-y          := lib/
 593 core-y          := usr/
 594 virt-y          := virt/
 595 endif # KBUILD_EXTMOD
 596
 597 ifeq ($(dot-config),1)
 598 # Read in config
 599 -include include/config/auto.conf
 600
 601 ifeq ($(KBUILD_EXTMOD),)
 602 # Read in dependencies to all Kconfig* files, make sure to run
 603 # oldconfig if changes are detected.
 604 -include include/config/auto.conf.cmd
 605
 606 # To avoid any implicit rule to kick in, define an empty command
 607 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 608
 609 # If .config is newer than include/config/auto.conf, someone tinkered
 610 # with it and forgot to run make oldconfig.
 611 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 612 # we execute the config step to be sure to catch updated Kconfig files
 613 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 614         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 615 else
 616 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 617 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 618 PHONY += include/config/auto.conf
 619
 620 include/config/auto.conf:
 621         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 622         echo >&2;                                                       \
 623         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 624         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 625         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 626         echo >&2 ;                                                      \
 627         /bin/false)
 628
 629 endif # KBUILD_EXTMOD
 630
 631 else
 632 # Dummy target needed, because used as prerequisite
 633 include/config/auto.conf: ;
 634 endif # $(dot-config)
 635
 636 # For the kernel to actually contain only the needed exported symbols,
 637 # we have to build modules as well to determine what those symbols are.
 638 # (this can be evaluated only once include/config/auto.conf has been included)
 639 ifdef CONFIG_TRIM_UNUSED_KSYMS
 640   KBUILD_MODULES := 1
 641 endif
 642
 643 # The all: target is the default when no target is given on the
 644 # command line.
 645 # This allow a user to issue only 'make' to build a kernel including modules
 646 # Defaults to vmlinux, but the arch makefile usually adds further targets
 647 all: vmlinux
 648
 649 # force no-pie for distro compilers that enable pie by default
 650 KBUILD_CFLAGS += $(call cc-option, -fno-pie)
 651 KBUILD_CFLAGS += $(call cc-option, -no-pie)
 652 KBUILD_AFLAGS += $(call cc-option, -fno-pie)
 653 KBUILD_CPPFLAGS += $(call cc-option, -fno-pie)
 654
 655 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 656 # values of the respective KBUILD_* variables
 657 ARCH_CPPFLAGS :=
 658 ARCH_AFLAGS :=
 659 ARCH_CFLAGS :=
 660 include arch/$(SRCARCH)/Makefile
 661
 662 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 663 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 664
 665 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 666 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 667 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 668 endif
 669
 670 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 671 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 672 else
 673 ifdef CONFIG_PROFILE_ALL_BRANCHES
 674 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 675 else
 676 KBUILD_CFLAGS   += -O2
 677 endif
 678 endif
 679
 680 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 681                         $(call cc-disable-warning,maybe-uninitialized,))
 682
 683 # Tell gcc to never replace conditional load with a non-conditional one
 684 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 685
 686 # check for 'asm goto'
 687 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 688         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 689         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 690 endif
 691
 692 include scripts/Makefile.gcc-plugins
 693
 694 ifdef CONFIG_READABLE_ASM
 695 # Disable optimizations that make assembler listings hard to read.
 696 # reorder blocks reorders the control in the function
 697 # ipa clone creates specialized cloned functions
 698 # partial inlining inlines only parts of functions
 699 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 700                  $(call cc-option,-fno-ipa-cp-clone,) \
 701                  $(call cc-option,-fno-partial-inlining)
 702 endif
 703
 704 ifneq ($(CONFIG_FRAME_WARN),0)
 705 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 706 endif
 707
 708 # This selects the stack protector compiler flag. Testing it is delayed
 709 # until after .config has been reprocessed, in the prepare-compiler-check
 710 # target.
 711 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 712   stackp-flag := -fstack-protector
 713   stackp-name := REGULAR
 714 else
 715 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 716   stackp-flag := -fstack-protector-strong
 717   stackp-name := STRONG
 718 else
 719   # Force off for distro compilers that enable stack protector by default.
 720   stackp-flag := $(call cc-option, -fno-stack-protector)
 721 endif
 722 endif
 723 # Find arch-specific stack protector compiler sanity-checking script.
 724 ifdef CONFIG_CC_STACKPROTECTOR
 725   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 726   stackp-check := $(wildcard $(stackp-path))
 727 endif
 728 KBUILD_CFLAGS += $(stackp-flag)
 729
 730 ifeq ($(cc-name),clang)
 731 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 732 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 733 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 734 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 735 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 736 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 737 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 738 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 739 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 740 # See modpost pattern 2
 741 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 742 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 743 else
 744
 745 # These warnings generated too much noise in a regular build.
 746 # Use make W=1 to enable them (see scripts/Makefile.build)
 747 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 748 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 749 endif
 750
 751 ifdef CONFIG_FRAME_POINTER
 752 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 753 else
 754 # Some targets (ARM with Thumb2, for example), can't be built with frame
 755 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 756 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 757 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 758 # -fomit-frame-pointer with FUNCTION_TRACER.
 759 ifndef CONFIG_FUNCTION_TRACER
 760 KBUILD_CFLAGS   += -fomit-frame-pointer
 761 endif
 762 endif
 763
 764 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 765
 766 ifdef CONFIG_DEBUG_INFO
 767 ifdef CONFIG_DEBUG_INFO_SPLIT
 768 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 769 else
 770 KBUILD_CFLAGS   += -g
 771 endif
 772 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 773 endif
 774 ifdef CONFIG_DEBUG_INFO_DWARF4
 775 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 776 endif
 777
 778 ifdef CONFIG_DEBUG_INFO_REDUCED
 779 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 780                    $(call cc-option,-fno-var-tracking)
 781 endif
 782
 783 ifdef CONFIG_FUNCTION_TRACER
 784 ifndef CC_FLAGS_FTRACE
 785 CC_FLAGS_FTRACE := -pg
 786 endif
 787 export CC_FLAGS_FTRACE
 788 ifdef CONFIG_HAVE_FENTRY
 789 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 790 endif
 791 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 792 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 793 ifdef CONFIG_DYNAMIC_FTRACE
 794         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 795                 BUILD_C_RECORDMCOUNT := y
 796                 export BUILD_C_RECORDMCOUNT
 797         endif
 798 endif
 799 endif
 800
 801 # We trigger additional mismatches with less inlining
 802 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 803 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 804 endif
 805
 806 # arch Makefile may override CC so keep this after arch Makefile is included
 807 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 808 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 809
 810 # warn about C99 declaration after statement
 811 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 812
 813 # disable pointer signed / unsigned warnings in gcc 4.0
 814 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 815
 816 # disable invalid "can't wrap" optimizations for signed / pointers
 817 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 818
 819 # conserve stack if available
 820 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 821
 822 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 823 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 824
 825 # require functions to have arguments in prototypes, not empty 'int foo()'
 826 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 827
 828 # Prohibit date/time macros, which would make the build non-deterministic
 829 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 830
 831 # enforce correct pointer usage
 832 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 833
 834 # use the deterministic mode of AR if available
 835 KBUILD_ARFLAGS := $(call ar-option,D)
 836
 837 include scripts/Makefile.kasan
 838 include scripts/Makefile.extrawarn
 839 include scripts/Makefile.ubsan
 840
 841 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 842 # last assignments
 843 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 844 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 845 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 846
 847 # Use --build-id when available.
 848 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 849                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 850 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 851 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 852
 853 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 854 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 855 endif
 856
 857 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 858 LDFLAGS_vmlinux += $(call ld-option, -X,)
 859 endif
 860
 861 # Default kernel image to build when no specific target is given.
 862 # KBUILD_IMAGE may be overruled on the command line or
 863 # set in the environment
 864 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 865 # this default value
 866 export KBUILD_IMAGE ?= vmlinux
 867
 868 #
 869 # INSTALL_PATH specifies where to place the updated kernel and system map
 870 # images. Default is /boot, but you can set it to other values
 871 export  INSTALL_PATH ?= /boot
 872
 873 #
 874 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 875 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 876 # an argument if needed. Otherwise it defaults to the kernel install path
 877 #
 878 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 879
 880 #
 881 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 882 # relocations required by build roots.  This is not defined in the
 883 # makefile but the argument can be passed to make if needed.
 884 #
 885
 886 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 887 export MODLIB
 888
 889 #
 890 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 891 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 892 # the default option --strip-debug will be used.  Otherwise,
 893 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 894
 895 ifdef INSTALL_MOD_STRIP
 896 ifeq ($(INSTALL_MOD_STRIP),1)
 897 mod_strip_cmd = $(STRIP) --strip-debug
 898 else
 899 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 900 endif # INSTALL_MOD_STRIP=1
 901 else
 902 mod_strip_cmd = true
 903 endif # INSTALL_MOD_STRIP
 904 export mod_strip_cmd
 905
 906 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 907 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 908 # or CONFIG_MODULE_COMPRESS_XZ.
 909
 910 mod_compress_cmd = true
 911 ifdef CONFIG_MODULE_COMPRESS
 912   ifdef CONFIG_MODULE_COMPRESS_GZIP
 913     mod_compress_cmd = gzip -n -f
 914   endif # CONFIG_MODULE_COMPRESS_GZIP
 915   ifdef CONFIG_MODULE_COMPRESS_XZ
 916     mod_compress_cmd = xz -f
 917   endif # CONFIG_MODULE_COMPRESS_XZ
 918 endif # CONFIG_MODULE_COMPRESS
 919 export mod_compress_cmd
 920
 921 # Select initial ramdisk compression format, default is gzip(1).
 922 # This shall be used by the dracut(8) tool while creating an initramfs image.
 923 #
 924 INITRD_COMPRESS-y                  := gzip
 925 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 926 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 927 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 928 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 929 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 930 # do not export INITRD_COMPRESS, since we didn't actually
 931 # choose a sane default compression above.
 932 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 933
 934 ifdef CONFIG_MODULE_SIG_ALL
 935 $(eval $(call config_filename,MODULE_SIG_KEY))
 936
 937 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 938 else
 939 mod_sign_cmd = true
 940 endif
 941 export mod_sign_cmd
 942
 943
 944 ifeq ($(KBUILD_EXTMOD),)
 945 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 946
 947 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 948                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 949                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 950
 951 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 952                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 953
 954 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 955 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 956 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 957 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 958 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 959 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 960 libs-y          := $(libs-y1) $(libs-y2)
 961 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 962
 963 # Externally visible symbols (used by link-vmlinux.sh)
 964 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 965 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 966 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 967 export LDFLAGS_vmlinux
 968 # used by scripts/pacmage/Makefile
 969 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 970
 971 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 972
 973 # Include targets which we want to execute sequentially if the rest of the
 974 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 975 # evaluated more than once.
 976 PHONY += vmlinux_prereq
 977 vmlinux_prereq: $(vmlinux-deps) FORCE
 978 ifdef CONFIG_HEADERS_CHECK
 979         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 980 endif
 981 ifdef CONFIG_GDB_SCRIPTS
 982         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 983 endif
 984 ifdef CONFIG_TRIM_UNUSED_KSYMS
 985         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 986           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 987 endif
 988
 989 # standalone target for easier testing
 990 include/generated/autoksyms.h: FORCE
 991         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 992
 993 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 994
 995 # Final link of vmlinux with optional arch pass after final link
 996     cmd_link-vmlinux =                                                 \
 997         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
 998         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 999
1000 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1001         +$(call if_changed,link-vmlinux)
1002
1003 # Build samples along the rest of the kernel
1004 ifdef CONFIG_SAMPLES
1005 vmlinux-dirs += samples
1006 endif
1007
1008 # The actual objects are generated when descending,
1009 # make sure no implicit rule kicks in
1010 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1011
1012 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1013 # Preset locale variables to speed up the build process. Limit locale
1014 # tweaks to this spot to avoid wrong language settings when running
1015 # make menuconfig etc.
1016 # Error messages still appears in the original language
1017
1018 PHONY += $(vmlinux-dirs)
1019 $(vmlinux-dirs): prepare scripts
1020         $(Q)$(MAKE) $(build)=$@
1021
1022 define filechk_kernel.release
1023         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1024 endef
1025
1026 # Store (new) KERNELRELEASE string in include/config/kernel.release
1027 include/config/kernel.release: include/config/auto.conf FORCE
1028         $(call filechk,kernel.release)
1029
1030
1031 # Things we need to do before we recursively start building the kernel
1032 # or the modules are listed in "prepare".
1033 # A multi level approach is used. prepareN is processed before prepareN-1.
1034 # archprepare is used in arch Makefiles and when processed asm symlink,
1035 # version.h and scripts_basic is processed / created.
1036
1037 # Listed in dependency order
1038 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1039
1040 # prepare3 is used to check if we are building in a separate output directory,
1041 # and if so do:
1042 # 1) Check that make has not been executed in the kernel src $(srctree)
1043 prepare3: include/config/kernel.release
1044 ifneq ($(KBUILD_SRC),)
1045         @$(kecho) '  Using $(srctree) as source for kernel'
1046         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1047                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1048                 echo >&2 "  in the '$(srctree)' directory.";\
1049                 /bin/false; \
1050         fi;
1051 endif
1052
1053 # prepare2 creates a makefile if using a separate output directory.
1054 # From this point forward, .config has been reprocessed, so any rules
1055 # that need to depend on updated CONFIG_* values can be checked here.
1056 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1057
1058 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1059                    include/config/auto.conf
1060         $(cmd_crmodverdir)
1061
1062 archprepare: archheaders archscripts prepare1 scripts_basic
1063
1064 prepare0: archprepare gcc-plugins
1065         $(Q)$(MAKE) $(build)=.
1066
1067 # All the preparing..
1068 prepare: prepare0 prepare-objtool
1069
1070 ifdef CONFIG_STACK_VALIDATION
1071   has_libelf := $(call try-run,\
1072                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1073   ifeq ($(has_libelf),1)
1074     objtool_target := tools/objtool FORCE
1075   else
1076     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1077     SKIP_STACK_VALIDATION := 1
1078     export SKIP_STACK_VALIDATION
1079   endif
1080 endif
1081
1082 PHONY += prepare-objtool
1083 prepare-objtool: $(objtool_target)
1084
1085 # Check for CONFIG flags that require compiler support. Abort the build
1086 # after .config has been processed, but before the kernel build starts.
1087 #
1088 # For security-sensitive CONFIG options, we don't want to fallback and/or
1089 # silently change which compiler flags will be used, since that leads to
1090 # producing kernels with different security feature characteristics
1091 # depending on the compiler used. (For example, "But I selected
1092 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1093 PHONY += prepare-compiler-check
1094 prepare-compiler-check: FORCE
1095 # Make sure compiler supports requested stack protector flag.
1096 ifdef stackp-name
1097   ifeq ($(call cc-option, $(stackp-flag)),)
1098         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1099                   $(stackp-flag) not supported by compiler >&2 && exit 1
1100   endif
1101 endif
1102 # Make sure compiler does not have buggy stack-protector support.
1103 ifdef stackp-check
1104   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1105         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1106                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1107   endif
1108 endif
1109         @:
1110
1111 # Generate some files
1112 # ---------------------------------------------------------------------------
1113
1114 # KERNELRELEASE can change from a few different places, meaning version.h
1115 # needs to be updated, so this check is forced on all builds
1116
1117 uts_len := 64
1118 define filechk_utsrelease.h
1119         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1120           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1121           exit 1;                                                         \
1122         fi;                                                               \
1123         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1124 endef
1125
1126 define filechk_version.h
1127         (echo \#define LINUX_VERSION_CODE $(shell                         \
1128         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1129         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1130 endef
1131
1132 $(version_h): $(srctree)/Makefile FORCE
1133         $(call filechk,version.h)
1134         $(Q)rm -f $(old_version_h)
1135
1136 include/generated/utsrelease.h: include/config/kernel.release FORCE
1137         $(call filechk,utsrelease.h)
1138
1139 PHONY += headerdep
1140 headerdep:
1141         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1142         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1143
1144 # ---------------------------------------------------------------------------
1145 # Firmware install
1146 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1147 export INSTALL_FW_PATH
1148
1149 PHONY += firmware_install
1150 firmware_install:
1151         @mkdir -p $(objtree)/firmware
1152         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1153
1154 # ---------------------------------------------------------------------------
1155 # Kernel headers
1156
1157 #Default location for installed headers
1158 export INSTALL_HDR_PATH = $(objtree)/usr
1159
1160 # If we do an all arch process set dst to asm-$(hdr-arch)
1161 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1162
1163 PHONY += archheaders
1164 archheaders:
1165
1166 PHONY += archscripts
1167 archscripts:
1168
1169 PHONY += __headers
1170 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1171         $(Q)$(MAKE) $(build)=scripts build_unifdef
1172
1173 PHONY += headers_install_all
1174 headers_install_all:
1175         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1176
1177 PHONY += headers_install
1178 headers_install: __headers
1179         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1180           $(error Headers not exportable for the $(SRCARCH) architecture))
1181         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1182         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1183         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1184
1185 PHONY += headers_check_all
1186 headers_check_all: headers_install_all
1187         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1188
1189 PHONY += headers_check
1190 headers_check: headers_install
1191         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1192         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1193         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1194
1195 # ---------------------------------------------------------------------------
1196 # Kernel selftest
1197
1198 PHONY += kselftest
1199 kselftest:
1200         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1201
1202 kselftest-clean:
1203         $(Q)$(MAKE) -C tools/testing/selftests clean
1204
1205 PHONY += kselftest-merge
1206 kselftest-merge:
1207         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1208         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1209                 -m $(objtree)/.config \
1210                 $(srctree)/tools/testing/selftests/*/config
1211         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1212
1213 # ---------------------------------------------------------------------------
1214 # Modules
1215
1216 ifdef CONFIG_MODULES
1217
1218 # By default, build modules as well
1219
1220 all: modules
1221
1222 # Build modules
1223 #
1224 # A module can be listed more than once in obj-m resulting in
1225 # duplicate lines in modules.order files.  Those are removed
1226 # using awk while concatenating to the final file.
1227
1228 PHONY += modules
1229 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1230         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1231         @$(kecho) '  Building modules, stage 2.';
1232         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1233         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1234
1235 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1236         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1237
1238 %/modules.builtin: include/config/auto.conf
1239         $(Q)$(MAKE) $(modbuiltin)=$*
1240
1241
1242 # Target to prepare building external modules
1243 PHONY += modules_prepare
1244 modules_prepare: prepare scripts
1245
1246 # Target to install modules
1247 PHONY += modules_install
1248 modules_install: _modinst_ _modinst_post
1249
1250 PHONY += _modinst_
1251 _modinst_:
1252         @rm -rf $(MODLIB)/kernel
1253         @rm -f $(MODLIB)/source
1254         @mkdir -p $(MODLIB)/kernel
1255         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1256         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1257                 rm -f $(MODLIB)/build ; \
1258                 ln -s $(CURDIR) $(MODLIB)/build ; \
1259         fi
1260         @cp -f $(objtree)/modules.order $(MODLIB)/
1261         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1262         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1263
1264 # This depmod is only for convenience to give the initial
1265 # boot a modules.dep even before / is mounted read-write.  However the
1266 # boot script depmod is the master version.
1267 PHONY += _modinst_post
1268 _modinst_post: _modinst_
1269         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1270         $(call cmd,depmod)
1271
1272 ifeq ($(CONFIG_MODULE_SIG), y)
1273 PHONY += modules_sign
1274 modules_sign:
1275         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1276 endif
1277
1278 else # CONFIG_MODULES
1279
1280 # Modules not configured
1281 # ---------------------------------------------------------------------------
1282
1283 PHONY += modules modules_install
1284 modules modules_install:
1285         @echo >&2
1286         @echo >&2 "The present kernel configuration has modules disabled."
1287         @echo >&2 "Type 'make config' and enable loadable module support."
1288         @echo >&2 "Then build a kernel with module support enabled."
1289         @echo >&2
1290         @exit 1
1291
1292 endif # CONFIG_MODULES
1293
1294 ###
1295 # Cleaning is done on three levels.
1296 # make clean     Delete most generated files
1297 #                Leave enough to build external modules
1298 # make mrproper  Delete the current configuration, and all generated files
1299 # make distclean Remove editor backup files, patch leftover files and the like
1300
1301 # Directories & files removed with 'make clean'
1302 CLEAN_DIRS  += $(MODVERDIR)
1303
1304 # Directories & files removed with 'make mrproper'
1305 MRPROPER_DIRS  += include/config usr/include include/generated          \
1306                   arch/*/include/generated .tmp_objdiff
1307 MRPROPER_FILES += .config .config.old .version .old_version \
1308                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1309                   signing_key.pem signing_key.priv signing_key.x509     \
1310                   x509.genkey extra_certificates signing_key.x509.keyid \
1311                   signing_key.x509.signer vmlinux-gdb.py
1312
1313 # clean - Delete most, but leave enough to build external modules
1314 #
1315 clean: rm-dirs  := $(CLEAN_DIRS)
1316 clean: rm-files := $(CLEAN_FILES)
1317 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1318
1319 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1320 $(clean-dirs):
1321         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1322
1323 vmlinuxclean:
1324         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1325         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1326
1327 clean: archclean vmlinuxclean
1328
1329 # mrproper - Delete all generated files, including .config
1330 #
1331 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1332 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1333 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1334
1335 PHONY += $(mrproper-dirs) mrproper archmrproper
1336 $(mrproper-dirs):
1337         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1338
1339 mrproper: clean archmrproper $(mrproper-dirs)
1340         $(call cmd,rmdirs)
1341         $(call cmd,rmfiles)
1342
1343 # distclean
1344 #
1345 PHONY += distclean
1346
1347 distclean: mrproper
1348         @find $(srctree) $(RCS_FIND_IGNORE) \
1349                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1350                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1351                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1352                 -type f -print | xargs rm -f
1353
1354
1355 # Packaging of the kernel to various formats
1356 # ---------------------------------------------------------------------------
1357 # rpm target kept for backward compatibility
1358 package-dir     := scripts/package
1359
1360 %src-pkg: FORCE
1361         $(Q)$(MAKE) $(build)=$(package-dir) $@
1362 %pkg: include/config/kernel.release FORCE
1363         $(Q)$(MAKE) $(build)=$(package-dir) $@
1364 rpm: include/config/kernel.release FORCE
1365         $(Q)$(MAKE) $(build)=$(package-dir) $@
1366
1367
1368 # Brief documentation of the typical targets used
1369 # ---------------------------------------------------------------------------
1370
1371 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1372 boards := $(sort $(notdir $(boards)))
1373 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1374 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1375
1376 PHONY += help
1377 help:
1378         @echo  'Cleaning targets:'
1379         @echo  '  clean           - Remove most generated files but keep the config and'
1380         @echo  '                    enough build support to build external modules'
1381         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1382         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1383         @echo  ''
1384         @echo  'Configuration targets:'
1385         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1386         @echo  ''
1387         @echo  'Other generic targets:'
1388         @echo  '  all             - Build all targets marked with [*]'
1389         @echo  '* vmlinux         - Build the bare kernel'
1390         @echo  '* modules         - Build all modules'
1391         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1392         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1393         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1394         @echo  '  dir/            - Build all files in dir and below'
1395         @echo  '  dir/file.[ois]  - Build specified target only'
1396         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1397         @echo  '                    (requires a recent binutils and recent build (System.map))'
1398         @echo  '  dir/file.ko     - Build module including final link'
1399         @echo  '  modules_prepare - Set up for building external modules'
1400         @echo  '  tags/TAGS       - Generate tags file for editors'
1401         @echo  '  cscope          - Generate cscope index'
1402         @echo  '  gtags           - Generate GNU GLOBAL index'
1403         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1404         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1405         @echo  '  image_name      - Output the image name (use with make -s)'
1406         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1407          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1408          echo  ''
1409         @echo  'Static analysers'
1410         @echo  '  checkstack      - Generate a list of stack hogs'
1411         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1412         @echo  '  versioncheck    - Sanity check on version.h usage'
1413         @echo  '  includecheck    - Check for duplicate included header files'
1414         @echo  '  export_report   - List the usages of all exported symbols'
1415         @echo  '  headers_check   - Sanity check on exported headers'
1416         @echo  '  headerdep       - Detect inclusion cycles in headers'
1417         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1418         @echo  ''
1419         @echo  'Kernel selftest'
1420         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1421         @echo  '                    Build, install, and boot kernel before'
1422         @echo  '                    running kselftest on it'
1423         @echo  '  kselftest-clean - Remove all generated kselftest files'
1424         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1425         @echo  '                    .config.'
1426         @echo  ''
1427         @echo  'Kernel packaging:'
1428         @$(MAKE) $(build)=$(package-dir) help
1429         @echo  ''
1430         @echo  'Documentation targets:'
1431         @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1432         @echo  ''
1433         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1434         @echo  ''
1435         @echo  'Architecture specific targets ($(SRCARCH)):'
1436         @$(if $(archhelp),$(archhelp),\
1437                 echo '  No architecture specific help defined for $(SRCARCH)')
1438         @echo  ''
1439         @$(if $(boards), \
1440                 $(foreach b, $(boards), \
1441                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1442                 echo '')
1443         @$(if $(board-dirs), \
1444                 $(foreach b, $(board-dirs), \
1445                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1446                 printf "  %-16s - Show all of the above\\n" help-boards; \
1447                 echo '')
1448
1449         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1450         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1451         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1452         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1453         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1454         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1455         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1456         @echo  '                1: warnings which may be relevant and do not occur too often'
1457         @echo  '                2: warnings which occur quite often but may still be relevant'
1458         @echo  '                3: more obscure warnings, can most likely be ignored'
1459         @echo  '                Multiple levels can be combined with W=12 or W=123'
1460         @echo  ''
1461         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1462         @echo  'For further info see the ./README file'
1463
1464
1465 help-board-dirs := $(addprefix help-,$(board-dirs))
1466
1467 help-boards: $(help-board-dirs)
1468
1469 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1470
1471 $(help-board-dirs): help-%:
1472         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1473         @$(if $(boards-per-dir), \
1474                 $(foreach b, $(boards-per-dir), \
1475                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1476                 echo '')
1477
1478
1479 # Documentation targets
1480 # ---------------------------------------------------------------------------
1481 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1482 PHONY += $(DOC_TARGETS)
1483 $(DOC_TARGETS): scripts_basic FORCE
1484         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1485         $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1486         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1487
1488 else # KBUILD_EXTMOD
1489
1490 ###
1491 # External module support.
1492 # When building external modules the kernel used as basis is considered
1493 # read-only, and no consistency checks are made and the make
1494 # system is not used on the basis kernel. If updates are required
1495 # in the basis kernel ordinary make commands (without M=...) must
1496 # be used.
1497 #
1498 # The following are the only valid targets when building external
1499 # modules.
1500 # make M=dir clean     Delete all automatically generated files
1501 # make M=dir modules   Make all modules in specified dir
1502 # make M=dir           Same as 'make M=dir modules'
1503 # make M=dir modules_install
1504 #                      Install the modules built in the module directory
1505 #                      Assumes install directory is already created
1506
1507 # We are always building modules
1508 KBUILD_MODULES := 1
1509 PHONY += crmodverdir
1510 crmodverdir:
1511         $(cmd_crmodverdir)
1512
1513 PHONY += $(objtree)/Module.symvers
1514 $(objtree)/Module.symvers:
1515         @test -e $(objtree)/Module.symvers || ( \
1516         echo; \
1517         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1518         echo "           is missing; modules will have no dependencies and modversions."; \
1519         echo )
1520
1521 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1522 PHONY += $(module-dirs) modules
1523 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1524         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1525
1526 modules: $(module-dirs)
1527         @$(kecho) '  Building modules, stage 2.';
1528         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1529
1530 PHONY += modules_install
1531 modules_install: _emodinst_ _emodinst_post
1532
1533 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1534 PHONY += _emodinst_
1535 _emodinst_:
1536         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1537         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1538
1539 PHONY += _emodinst_post
1540 _emodinst_post: _emodinst_
1541         $(call cmd,depmod)
1542
1543 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1544
1545 PHONY += $(clean-dirs) clean
1546 $(clean-dirs):
1547         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1548
1549 clean:  rm-dirs := $(MODVERDIR)
1550 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1551
1552 PHONY += help
1553 help:
1554         @echo  '  Building external modules.'
1555         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1556         @echo  ''
1557         @echo  '  modules         - default target, build the module(s)'
1558         @echo  '  modules_install - install the module'
1559         @echo  '  clean           - remove generated files in module directory only'
1560         @echo  ''
1561
1562 # Dummies...
1563 PHONY += prepare scripts
1564 prepare: ;
1565 scripts: ;
1566 endif # KBUILD_EXTMOD
1567
1568 clean: $(clean-dirs)
1569         $(call cmd,rmdirs)
1570         $(call cmd,rmfiles)
1571         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1572                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1573                 -o -name '*.ko.*' \
1574                 -o -name '*.dwo'  \
1575                 -o -name '*.su'  \
1576                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1577                 -o -name '*.symtypes' -o -name 'modules.order' \
1578                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1579                 -o -name '*.c.[012]*.*' \
1580                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1581
1582 # Generate tags for editors
1583 # ---------------------------------------------------------------------------
1584 quiet_cmd_tags = GEN     $@
1585       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1586
1587 tags TAGS cscope gtags: FORCE
1588         $(call cmd,tags)
1589
1590 # Scripts to check various things for consistency
1591 # ---------------------------------------------------------------------------
1592
1593 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1594
1595 includecheck:
1596         find $(srctree)/* $(RCS_FIND_IGNORE) \
1597                 -name '*.[hcS]' -type f -print | sort \
1598                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1599
1600 versioncheck:
1601         find $(srctree)/* $(RCS_FIND_IGNORE) \
1602                 -name '*.[hcS]' -type f -print | sort \
1603                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1604
1605 coccicheck:
1606         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1607
1608 namespacecheck:
1609         $(PERL) $(srctree)/scripts/namespace.pl
1610
1611 export_report:
1612         $(PERL) $(srctree)/scripts/export_report.pl
1613
1614 endif #ifeq ($(config-targets),1)
1615 endif #ifeq ($(mixed-targets),1)
1616
1617 PHONY += checkstack kernelrelease kernelversion image_name
1618
1619 # UML needs a little special treatment here.  It wants to use the host
1620 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1621 # else wants $(ARCH), including people doing cross-builds, which means
1622 # that $(SUBARCH) doesn't work here.
1623 ifeq ($(ARCH), um)
1624 CHECKSTACK_ARCH := $(SUBARCH)
1625 else
1626 CHECKSTACK_ARCH := $(ARCH)
1627 endif
1628 checkstack:
1629         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1630         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1631
1632 kernelrelease:
1633         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1634
1635 kernelversion:
1636         @echo $(KERNELVERSION)
1637
1638 image_name:
1639         @echo $(KBUILD_IMAGE)
1640
1641 # Clear a bunch of variables before executing the submake
1642 tools/: FORCE
1643         $(Q)mkdir -p $(objtree)/tools
1644         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1645
1646 tools/%: FORCE
1647         $(Q)mkdir -p $(objtree)/tools
1648         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1649
1650 # Single targets
1651 # ---------------------------------------------------------------------------
1652 # Single targets are compatible with:
1653 # - build with mixed source and output
1654 # - build with separate output dir 'make O=...'
1655 # - external modules
1656 #
1657 #  target-dir => where to store outputfile
1658 #  build-dir  => directory in kernel source tree to use
1659
1660 ifeq ($(KBUILD_EXTMOD),)
1661         build-dir  = $(patsubst %/,%,$(dir $@))
1662         target-dir = $(dir $@)
1663 else
1664         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1665         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1666         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1667 endif
1668
1669 %.s: %.c prepare scripts FORCE
1670         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1671 %.i: %.c prepare scripts FORCE
1672         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1673 %.o: %.c prepare scripts FORCE
1674         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1675 %.lst: %.c prepare scripts FORCE
1676         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1677 %.s: %.S prepare scripts FORCE
1678         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1679 %.o: %.S prepare scripts FORCE
1680         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1681 %.symtypes: %.c prepare scripts FORCE
1682         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1683
1684 # Modules
1685 /: prepare scripts FORCE
1686         $(cmd_crmodverdir)
1687         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1688         $(build)=$(build-dir)
1689 # Make sure the latest headers are built for Documentation
1690 Documentation/ samples/: headers_install
1691 %/: prepare scripts FORCE
1692         $(cmd_crmodverdir)
1693         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1694         $(build)=$(build-dir)
1695 %.ko: prepare scripts FORCE
1696         $(cmd_crmodverdir)
1697         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1698         $(build)=$(build-dir) $(@:.ko=.o)
1699         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1700
1701 # FIXME Should go into a make.lib or something
1702 # ===========================================================================
1703
1704 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1705       cmd_rmdirs = rm -rf $(rm-dirs)
1706
1707 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1708       cmd_rmfiles = rm -f $(rm-files)
1709
1710 # Run depmod only if we have System.map and depmod is executable
1711 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1712       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1713                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1714
1715 # Create temporary dir for module support files
1716 # clean it up only when building all modules
1717 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1718                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1719
1720 # read all saved command lines
1721
1722 targets := $(wildcard $(sort $(targets)))
1723 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1724
1725 ifneq ($(cmd_files),)
1726   $(cmd_files): ;       # Do not try to update included dependency files
1727   include $(cmd_files)
1728 endif
1729
1730 endif   # skip-makefile
1731
1732 PHONY += FORCE
1733 FORCE:
1734
1735 # Declare the contents of the .PHONY variable as phony.  We keep that
1736 # information in a variable so we can use it in if_changed and friends.
1737 .PHONY: $(PHONY)