Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 14
   3 SUBLEVEL = 0
   4 EXTRAVERSION = -rc1
   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 ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  88   quiet=silent_
  89   tools_silent=s
  90 endif
  91
  92 export quiet Q KBUILD_VERBOSE
  93
  94 # kbuild supports saving output files in a separate directory.
  95 # To locate output files in a separate directory two syntaxes are supported.
  96 # In both cases the working directory must be the root of the kernel src.
  97 # 1) O=
  98 # Use "make O=dir/to/store/output/files/"
  99 #
 100 # 2) Set KBUILD_OUTPUT
 101 # Set the environment variable KBUILD_OUTPUT to point to the directory
 102 # where the output files shall be placed.
 103 # export KBUILD_OUTPUT=dir/to/store/output/files/
 104 # make
 105 #
 106 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 107 # variable.
 108
 109 # KBUILD_SRC is not intended to be used by the regular user (for now),
 110 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 111 ifeq ($(KBUILD_SRC),)
 112
 113 # OK, Make called in directory where kernel src resides
 114 # Do we want to locate output files in a separate directory?
 115 ifeq ("$(origin O)", "command line")
 116   KBUILD_OUTPUT := $(O)
 117 endif
 118
 119 # That's our default target when none is given on the command line
 120 PHONY := _all
 121 _all:
 122
 123 # Cancel implicit rules on top Makefile
 124 $(CURDIR)/Makefile Makefile: ;
 125
 126 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 127   $(error main directory cannot contain spaces nor colons)
 128 endif
 129
 130 ifneq ($(KBUILD_OUTPUT),)
 131 # check that the output directory actually exists
 132 saved-output := $(KBUILD_OUTPUT)
 133 $(shell [ -d $(KBUILD_OUTPUT) ] || mkdir -p $(KBUILD_OUTPUT))
 134 KBUILD_OUTPUT := $(realpath $(KBUILD_OUTPUT))
 135 $(if $(KBUILD_OUTPUT),, \
 136      $(error failed to create output directory "$(saved-output)"))
 137
 138 PHONY += $(MAKECMDGOALS) sub-make
 139
 140 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 141         @:
 142
 143 # Invoke a second make in the output directory, passing relevant variables
 144 sub-make:
 145         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 146         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 147
 148 # Leave processing to above invocation of make
 149 skip-makefile := 1
 150 endif # ifneq ($(KBUILD_OUTPUT),)
 151 endif # ifeq ($(KBUILD_SRC),)
 152
 153 # We process the rest of the Makefile if this is the final invocation of make
 154 ifeq ($(skip-makefile),)
 155
 156 # Do not print "Entering directory ...",
 157 # but we want to display it when entering to the output directory
 158 # so that IDEs/editors are able to understand relative filenames.
 159 MAKEFLAGS += --no-print-directory
 160
 161 # Call a source code checker (by default, "sparse") as part of the
 162 # C compilation.
 163 #
 164 # Use 'make C=1' to enable checking of only re-compiled files.
 165 # Use 'make C=2' to enable checking of *all* source files, regardless
 166 # of whether they are re-compiled or not.
 167 #
 168 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 169 # including where to get the "sparse" utility.
 170
 171 ifeq ("$(origin C)", "command line")
 172   KBUILD_CHECKSRC = $(C)
 173 endif
 174 ifndef KBUILD_CHECKSRC
 175   KBUILD_CHECKSRC = 0
 176 endif
 177
 178 # Use make M=dir to specify directory of external module to build
 179 # Old syntax make ... SUBDIRS=$PWD is still supported
 180 # Setting the environment variable KBUILD_EXTMOD take precedence
 181 ifdef SUBDIRS
 182   KBUILD_EXTMOD ?= $(SUBDIRS)
 183 endif
 184
 185 ifeq ("$(origin M)", "command line")
 186   KBUILD_EXTMOD := $(M)
 187 endif
 188
 189 # If building an external module we do not care about the all: rule
 190 # but instead _all depend on modules
 191 PHONY += all
 192 ifeq ($(KBUILD_EXTMOD),)
 193 _all: all
 194 else
 195 _all: modules
 196 endif
 197
 198 ifeq ($(KBUILD_SRC),)
 199         # building in the source tree
 200         srctree := .
 201 else
 202         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 203                 # building in a subdirectory of the source tree
 204                 srctree := ..
 205         else
 206                 srctree := $(KBUILD_SRC)
 207         endif
 208 endif
 209 objtree         := .
 210 src             := $(srctree)
 211 obj             := $(objtree)
 212
 213 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 214
 215 export srctree objtree VPATH
 216
 217 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 218 # first, and if a usermode build is happening, the "ARCH=um" on the command
 219 # line overrides the setting of ARCH below.  If a native build is happening,
 220 # then ARCH is assigned, getting whatever value it gets normally, and
 221 # SUBARCH is subsequently ignored.
 222
 223 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 224                                   -e s/sun4u/sparc64/ \
 225                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 226                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 227                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 228                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 229
 230 # Cross compiling and selecting different set of gcc/bin-utils
 231 # ---------------------------------------------------------------------------
 232 #
 233 # When performing cross compilation for other architectures ARCH shall be set
 234 # to the target architecture. (See arch/* for the possibilities).
 235 # ARCH can be set during invocation of make:
 236 # make ARCH=ia64
 237 # Another way is to have ARCH set in the environment.
 238 # The default ARCH is the host where make is executed.
 239
 240 # CROSS_COMPILE specify the prefix used for all executables used
 241 # during compilation. Only gcc and related bin-utils executables
 242 # are prefixed with $(CROSS_COMPILE).
 243 # CROSS_COMPILE can be set on the command line
 244 # make CROSS_COMPILE=ia64-linux-
 245 # Alternatively CROSS_COMPILE can be set in the environment.
 246 # A third alternative is to store a setting in .config so that plain
 247 # "make" in the configured kernel build directory always uses that.
 248 # Default value for CROSS_COMPILE is not to prefix executables
 249 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 250 ARCH            ?= $(SUBARCH)
 251 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 252
 253 # Architecture as present in compile.h
 254 UTS_MACHINE     := $(ARCH)
 255 SRCARCH         := $(ARCH)
 256
 257 # Additional ARCH settings for x86
 258 ifeq ($(ARCH),i386)
 259         SRCARCH := x86
 260 endif
 261 ifeq ($(ARCH),x86_64)
 262         SRCARCH := x86
 263 endif
 264
 265 # Additional ARCH settings for sparc
 266 ifeq ($(ARCH),sparc32)
 267        SRCARCH := sparc
 268 endif
 269 ifeq ($(ARCH),sparc64)
 270        SRCARCH := sparc
 271 endif
 272
 273 # Additional ARCH settings for sh
 274 ifeq ($(ARCH),sh64)
 275        SRCARCH := sh
 276 endif
 277
 278 # Additional ARCH settings for tile
 279 ifeq ($(ARCH),tilepro)
 280        SRCARCH := tile
 281 endif
 282 ifeq ($(ARCH),tilegx)
 283        SRCARCH := tile
 284 endif
 285
 286 # Where to locate arch specific headers
 287 hdr-arch  := $(SRCARCH)
 288
 289 KCONFIG_CONFIG  ?= .config
 290 export KCONFIG_CONFIG
 291
 292 # SHELL used by kbuild
 293 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 294           else if [ -x /bin/bash ]; then echo /bin/bash; \
 295           else echo sh; fi ; fi)
 296
 297 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
 298 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
 299 HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
 300
 301 HOSTCC       = gcc
 302 HOSTCXX      = g++
 303 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 304                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 305 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 306 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 307 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 308
 309 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 310 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 311                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 312 endif
 313
 314 # Decide whether to build built-in, modular, or both.
 315 # Normally, just do built-in.
 316
 317 KBUILD_MODULES :=
 318 KBUILD_BUILTIN := 1
 319
 320 # If we have only "make modules", don't compile built-in objects.
 321 # When we're building modules with modversions, we need to consider
 322 # the built-in objects during the descend as well, in order to
 323 # make sure the checksums are up to date before we record them.
 324
 325 ifeq ($(MAKECMDGOALS),modules)
 326   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 327 endif
 328
 329 # If we have "make <whatever> modules", compile modules
 330 # in addition to whatever we do anyway.
 331 # Just "make" or "make all" shall build modules as well
 332
 333 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 334   KBUILD_MODULES := 1
 335 endif
 336
 337 ifeq ($(MAKECMDGOALS),)
 338   KBUILD_MODULES := 1
 339 endif
 340
 341 export KBUILD_MODULES KBUILD_BUILTIN
 342 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 343
 344 # We need some generic definitions (do not try to remake the file).
 345 scripts/Kbuild.include: ;
 346 include scripts/Kbuild.include
 347
 348 # Make variables (CC, etc...)
 349 AS              = $(CROSS_COMPILE)as
 350 LD              = $(CROSS_COMPILE)ld
 351 CC              = $(CROSS_COMPILE)gcc
 352 CPP             = $(CC) -E
 353 AR              = $(CROSS_COMPILE)ar
 354 NM              = $(CROSS_COMPILE)nm
 355 STRIP           = $(CROSS_COMPILE)strip
 356 OBJCOPY         = $(CROSS_COMPILE)objcopy
 357 OBJDUMP         = $(CROSS_COMPILE)objdump
 358 AWK             = awk
 359 GENKSYMS        = scripts/genksyms/genksyms
 360 INSTALLKERNEL  := installkernel
 361 DEPMOD          = /sbin/depmod
 362 PERL            = perl
 363 PYTHON          = python
 364 CHECK           = sparse
 365
 366 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 367                   -Wbitwise -Wno-return-void $(CF)
 368 NOSTDINC_FLAGS  =
 369 CFLAGS_MODULE   =
 370 AFLAGS_MODULE   =
 371 LDFLAGS_MODULE  =
 372 CFLAGS_KERNEL   =
 373 AFLAGS_KERNEL   =
 374 LDFLAGS_vmlinux =
 375 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 376 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 377
 378
 379 # Use USERINCLUDE when you must reference the UAPI directories only.
 380 USERINCLUDE    := \
 381                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 382                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 383                 -I$(srctree)/include/uapi \
 384                 -I$(objtree)/include/generated/uapi \
 385                 -include $(srctree)/include/linux/kconfig.h
 386
 387 # Use LINUXINCLUDE when you must reference the include/ directory.
 388 # Needed to be compatible with the O= option
 389 LINUXINCLUDE    := \
 390                 -I$(srctree)/arch/$(hdr-arch)/include \
 391                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 392                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 393                 -I$(objtree)/include \
 394                 $(USERINCLUDE)
 395
 396 KBUILD_CPPFLAGS := -D__KERNEL__
 397
 398 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 399                    -fno-strict-aliasing -fno-common -fshort-wchar \
 400                    -Werror-implicit-function-declaration \
 401                    -Wno-format-security \
 402                    -std=gnu89 $(call cc-option,-fno-PIE)
 403
 404
 405 KBUILD_AFLAGS_KERNEL :=
 406 KBUILD_CFLAGS_KERNEL :=
 407 KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
 408 KBUILD_AFLAGS_MODULE  := -DMODULE
 409 KBUILD_CFLAGS_MODULE  := -DMODULE
 410 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 411
 412 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 413 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 414 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 415
 416 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 417 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 418 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 419 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 420 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 421
 422 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 423 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
 424 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 425 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 426 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 427 export KBUILD_ARFLAGS
 428
 429 # When compiling out-of-tree modules, put MODVERDIR in the module
 430 # tree rather than in the kernel tree. The kernel tree might
 431 # even be read-only.
 432 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 433
 434 # Files to ignore in find ... statements
 435
 436 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 437                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 438                           -prune -o
 439 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 440                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 441
 442 # ===========================================================================
 443 # Rules shared between *config targets and build targets
 444
 445 # Basic helpers built in scripts/basic/
 446 PHONY += scripts_basic
 447 scripts_basic:
 448         $(Q)$(MAKE) $(build)=scripts/basic
 449         $(Q)rm -f .tmp_quiet_recordmcount
 450
 451 # To avoid any implicit rule to kick in, define an empty command.
 452 scripts/basic/%: scripts_basic ;
 453
 454 PHONY += outputmakefile
 455 # outputmakefile generates a Makefile in the output directory, if using a
 456 # separate output directory. This allows convenient use of make in the
 457 # output directory.
 458 outputmakefile:
 459 ifneq ($(KBUILD_SRC),)
 460         $(Q)ln -fsn $(srctree) source
 461         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 462             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 463 endif
 464
 465 # Support for using generic headers in asm-generic
 466 PHONY += asm-generic uapi-asm-generic
 467 asm-generic: uapi-asm-generic
 468         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 469                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 470 uapi-asm-generic:
 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 $(MAKECMDGOALS)),1)
 504                         mixed-targets := 1
 505                 endif
 506         endif
 507 endif
 508 # install and modules_install need also be processed one by one
 509 ifneq ($(filter install,$(MAKECMDGOALS)),)
 510         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 511                 mixed-targets := 1
 512         endif
 513 endif
 514
 515 ifeq ($(mixed-targets),1)
 516 # ===========================================================================
 517 # We're called with mixed targets (*config and build targets).
 518 # Handle them one by one.
 519
 520 PHONY += $(MAKECMDGOALS) __build_one_by_one
 521
 522 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 523         @:
 524
 525 __build_one_by_one:
 526         $(Q)set -e; \
 527         for i in $(MAKECMDGOALS); do \
 528                 $(MAKE) -f $(srctree)/Makefile $$i; \
 529         done
 530
 531 else
 532 ifeq ($(config-targets),1)
 533 # ===========================================================================
 534 # *config targets only - make sure prerequisites are updated, and descend
 535 # in scripts/kconfig to make the *config target
 536
 537 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 538 # KBUILD_DEFCONFIG may point out an alternative default configuration
 539 # used for 'make defconfig'
 540 include arch/$(SRCARCH)/Makefile
 541 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 542
 543 config: scripts_basic outputmakefile FORCE
 544         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 545
 546 %config: scripts_basic outputmakefile FORCE
 547         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 548
 549 else
 550 # ===========================================================================
 551 # Build targets only - this includes vmlinux, arch specific targets, clean
 552 # targets and others. In general all targets except *config targets.
 553
 554 ifeq ($(KBUILD_EXTMOD),)
 555 # Additional helpers built in scripts/
 556 # Carefully list dependencies so we do not try to build scripts twice
 557 # in parallel
 558 PHONY += scripts
 559 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 560          asm-generic gcc-plugins
 561         $(Q)$(MAKE) $(build)=$(@)
 562
 563 # Objects we will link into vmlinux / subdirs we need to visit
 564 init-y          := init/
 565 drivers-y       := drivers/ sound/ firmware/
 566 net-y           := net/
 567 libs-y          := lib/
 568 core-y          := usr/
 569 virt-y          := virt/
 570 endif # KBUILD_EXTMOD
 571
 572 ifeq ($(dot-config),1)
 573 # Read in config
 574 -include include/config/auto.conf
 575
 576 ifeq ($(KBUILD_EXTMOD),)
 577 # Read in dependencies to all Kconfig* files, make sure to run
 578 # oldconfig if changes are detected.
 579 -include include/config/auto.conf.cmd
 580
 581 # To avoid any implicit rule to kick in, define an empty command
 582 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 583
 584 # If .config is newer than include/config/auto.conf, someone tinkered
 585 # with it and forgot to run make oldconfig.
 586 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 587 # we execute the config step to be sure to catch updated Kconfig files
 588 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 589         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 590 else
 591 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 592 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 593 PHONY += include/config/auto.conf
 594
 595 include/config/auto.conf:
 596         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 597         echo >&2;                                                       \
 598         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 599         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 600         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 601         echo >&2 ;                                                      \
 602         /bin/false)
 603
 604 endif # KBUILD_EXTMOD
 605
 606 else
 607 # Dummy target needed, because used as prerequisite
 608 include/config/auto.conf: ;
 609 endif # $(dot-config)
 610
 611 # For the kernel to actually contain only the needed exported symbols,
 612 # we have to build modules as well to determine what those symbols are.
 613 # (this can be evaluated only once include/config/auto.conf has been included)
 614 ifdef CONFIG_TRIM_UNUSED_KSYMS
 615   KBUILD_MODULES := 1
 616 endif
 617
 618 # The all: target is the default when no target is given on the
 619 # command line.
 620 # This allow a user to issue only 'make' to build a kernel including modules
 621 # Defaults to vmlinux, but the arch makefile usually adds further targets
 622 all: vmlinux
 623
 624 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 625 # values of the respective KBUILD_* variables
 626 ARCH_CPPFLAGS :=
 627 ARCH_AFLAGS :=
 628 ARCH_CFLAGS :=
 629 include arch/$(SRCARCH)/Makefile
 630
 631 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 632 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 633 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 634 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 635 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 636
 637 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 638 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 639 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 640 else
 641 ifdef CONFIG_PROFILE_ALL_BRANCHES
 642 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 643 else
 644 KBUILD_CFLAGS   += -O2
 645 endif
 646 endif
 647
 648 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 649                         $(call cc-disable-warning,maybe-uninitialized,))
 650
 651 # Tell gcc to never replace conditional load with a non-conditional one
 652 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 653
 654 # check for 'asm goto'
 655 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 656         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 657         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 658 endif
 659
 660 include scripts/Makefile.gcc-plugins
 661
 662 ifdef CONFIG_READABLE_ASM
 663 # Disable optimizations that make assembler listings hard to read.
 664 # reorder blocks reorders the control in the function
 665 # ipa clone creates specialized cloned functions
 666 # partial inlining inlines only parts of functions
 667 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 668                  $(call cc-option,-fno-ipa-cp-clone,) \
 669                  $(call cc-option,-fno-partial-inlining)
 670 endif
 671
 672 ifneq ($(CONFIG_FRAME_WARN),0)
 673 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 674 endif
 675
 676 # This selects the stack protector compiler flag. Testing it is delayed
 677 # until after .config has been reprocessed, in the prepare-compiler-check
 678 # target.
 679 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 680   stackp-flag := -fstack-protector
 681   stackp-name := REGULAR
 682 else
 683 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 684   stackp-flag := -fstack-protector-strong
 685   stackp-name := STRONG
 686 else
 687   # Force off for distro compilers that enable stack protector by default.
 688   stackp-flag := $(call cc-option, -fno-stack-protector)
 689 endif
 690 endif
 691 # Find arch-specific stack protector compiler sanity-checking script.
 692 ifdef CONFIG_CC_STACKPROTECTOR
 693   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 694   stackp-check := $(wildcard $(stackp-path))
 695 endif
 696 KBUILD_CFLAGS += $(stackp-flag)
 697
 698 ifeq ($(cc-name),clang)
 699 ifneq ($(CROSS_COMPILE),)
 700 CLANG_TARGET    := -target $(notdir $(CROSS_COMPILE:%-=%))
 701 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 702 endif
 703 ifneq ($(GCC_TOOLCHAIN),)
 704 CLANG_GCC_TC    := -gcc-toolchain $(GCC_TOOLCHAIN)
 705 endif
 706 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 707 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 708 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 709 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 710 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 711 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 712 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 713 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 714 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 715 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 716 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 717 # See modpost pattern 2
 718 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 719 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 720 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 721 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 722 else
 723
 724 # These warnings generated too much noise in a regular build.
 725 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 726 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 727 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 728 endif
 729
 730 ifdef CONFIG_FRAME_POINTER
 731 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 732 else
 733 # Some targets (ARM with Thumb2, for example), can't be built with frame
 734 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 735 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 736 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 737 # -fomit-frame-pointer with FUNCTION_TRACER.
 738 ifndef CONFIG_FUNCTION_TRACER
 739 KBUILD_CFLAGS   += -fomit-frame-pointer
 740 endif
 741 endif
 742
 743 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 744
 745 ifdef CONFIG_DEBUG_INFO
 746 ifdef CONFIG_DEBUG_INFO_SPLIT
 747 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 748 else
 749 KBUILD_CFLAGS   += -g
 750 endif
 751 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 752 endif
 753 ifdef CONFIG_DEBUG_INFO_DWARF4
 754 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 755 endif
 756
 757 ifdef CONFIG_DEBUG_INFO_REDUCED
 758 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 759                    $(call cc-option,-fno-var-tracking)
 760 endif
 761
 762 ifdef CONFIG_FUNCTION_TRACER
 763 ifndef CC_FLAGS_FTRACE
 764 CC_FLAGS_FTRACE := -pg
 765 endif
 766 export CC_FLAGS_FTRACE
 767 ifdef CONFIG_HAVE_FENTRY
 768 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 769 endif
 770 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 771 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 772 ifdef CONFIG_DYNAMIC_FTRACE
 773         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 774                 BUILD_C_RECORDMCOUNT := y
 775                 export BUILD_C_RECORDMCOUNT
 776         endif
 777 endif
 778 endif
 779
 780 # We trigger additional mismatches with less inlining
 781 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 782 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 783 endif
 784
 785 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 786 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 787 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 788 endif
 789
 790 # arch Makefile may override CC so keep this after arch Makefile is included
 791 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 792 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 793
 794 # warn about C99 declaration after statement
 795 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 796
 797 # disable pointer signed / unsigned warnings in gcc 4.0
 798 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 799
 800 # disable invalid "can't wrap" optimizations for signed / pointers
 801 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 802
 803 # conserve stack if available
 804 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 805
 806 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 807 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 808
 809 # require functions to have arguments in prototypes, not empty 'int foo()'
 810 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 811
 812 # Prohibit date/time macros, which would make the build non-deterministic
 813 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 814
 815 # enforce correct pointer usage
 816 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 817
 818 # Require designated initializers for all marked structures
 819 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 820
 821 # use the deterministic mode of AR if available
 822 KBUILD_ARFLAGS := $(call ar-option,D)
 823
 824 include scripts/Makefile.kasan
 825 include scripts/Makefile.extrawarn
 826 include scripts/Makefile.ubsan
 827
 828 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 829 # last assignments
 830 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 831 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 832 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 833
 834 # Use --build-id when available.
 835 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 836                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 837 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 838 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 839
 840 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 841 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 842 endif
 843
 844 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 845 LDFLAGS_vmlinux += $(call ld-option, -X,)
 846 endif
 847
 848 # Default kernel image to build when no specific target is given.
 849 # KBUILD_IMAGE may be overruled on the command line or
 850 # set in the environment
 851 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 852 # this default value
 853 export KBUILD_IMAGE ?= vmlinux
 854
 855 #
 856 # INSTALL_PATH specifies where to place the updated kernel and system map
 857 # images. Default is /boot, but you can set it to other values
 858 export  INSTALL_PATH ?= /boot
 859
 860 #
 861 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 862 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 863 # an argument if needed. Otherwise it defaults to the kernel install path
 864 #
 865 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 866
 867 #
 868 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 869 # relocations required by build roots.  This is not defined in the
 870 # makefile but the argument can be passed to make if needed.
 871 #
 872
 873 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 874 export MODLIB
 875
 876 #
 877 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 878 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 879 # the default option --strip-debug will be used.  Otherwise,
 880 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 881
 882 ifdef INSTALL_MOD_STRIP
 883 ifeq ($(INSTALL_MOD_STRIP),1)
 884 mod_strip_cmd = $(STRIP) --strip-debug
 885 else
 886 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 887 endif # INSTALL_MOD_STRIP=1
 888 else
 889 mod_strip_cmd = true
 890 endif # INSTALL_MOD_STRIP
 891 export mod_strip_cmd
 892
 893 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 894 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 895 # or CONFIG_MODULE_COMPRESS_XZ.
 896
 897 mod_compress_cmd = true
 898 ifdef CONFIG_MODULE_COMPRESS
 899   ifdef CONFIG_MODULE_COMPRESS_GZIP
 900     mod_compress_cmd = gzip -n -f
 901   endif # CONFIG_MODULE_COMPRESS_GZIP
 902   ifdef CONFIG_MODULE_COMPRESS_XZ
 903     mod_compress_cmd = xz -f
 904   endif # CONFIG_MODULE_COMPRESS_XZ
 905 endif # CONFIG_MODULE_COMPRESS
 906 export mod_compress_cmd
 907
 908 # Select initial ramdisk compression format, default is gzip(1).
 909 # This shall be used by the dracut(8) tool while creating an initramfs image.
 910 #
 911 INITRD_COMPRESS-y                  := gzip
 912 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 913 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 914 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 915 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 916 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 917 # do not export INITRD_COMPRESS, since we didn't actually
 918 # choose a sane default compression above.
 919 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 920
 921 ifdef CONFIG_MODULE_SIG_ALL
 922 $(eval $(call config_filename,MODULE_SIG_KEY))
 923
 924 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 925 else
 926 mod_sign_cmd = true
 927 endif
 928 export mod_sign_cmd
 929
 930 ifdef CONFIG_STACK_VALIDATION
 931   has_libelf := $(call try-run,\
 932                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 933   ifeq ($(has_libelf),1)
 934     objtool_target := tools/objtool FORCE
 935   else
 936     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 937     SKIP_STACK_VALIDATION := 1
 938     export SKIP_STACK_VALIDATION
 939   endif
 940 endif
 941
 942
 943 ifeq ($(KBUILD_EXTMOD),)
 944 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 945
 946 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 947                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 948                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 949
 950 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 951                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 952
 953 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 954 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 955 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 956 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 957 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 958 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
 959 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 960
 961 # Externally visible symbols (used by link-vmlinux.sh)
 962 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 963 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 964 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 965 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 966 export LDFLAGS_vmlinux
 967 # used by scripts/package/Makefile
 968 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 969
 970 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 971
 972 # Include targets which we want to execute sequentially if the rest of the
 973 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 974 # evaluated more than once.
 975 PHONY += vmlinux_prereq
 976 vmlinux_prereq: $(vmlinux-deps) FORCE
 977 ifdef CONFIG_HEADERS_CHECK
 978         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 979 endif
 980 ifdef CONFIG_GDB_SCRIPTS
 981         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
 982 endif
 983 ifdef CONFIG_TRIM_UNUSED_KSYMS
 984         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 985           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 986 endif
 987
 988 # standalone target for easier testing
 989 include/generated/autoksyms.h: FORCE
 990         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 991
 992 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 993
 994 # Final link of vmlinux with optional arch pass after final link
 995 cmd_link-vmlinux =                                                 \
 996         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
 997         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 998
 999 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1000         +$(call if_changed,link-vmlinux)
1001
1002 # Build samples along the rest of the kernel
1003 ifdef CONFIG_SAMPLES
1004 vmlinux-dirs += samples
1005 endif
1006
1007 # The actual objects are generated when descending,
1008 # make sure no implicit rule kicks in
1009 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1010
1011 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1012 # Preset locale variables to speed up the build process. Limit locale
1013 # tweaks to this spot to avoid wrong language settings when running
1014 # make menuconfig etc.
1015 # Error messages still appears in the original language
1016
1017 PHONY += $(vmlinux-dirs)
1018 $(vmlinux-dirs): prepare scripts
1019         $(Q)$(MAKE) $(build)=$@
1020
1021 define filechk_kernel.release
1022         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1023 endef
1024
1025 # Store (new) KERNELRELEASE string in include/config/kernel.release
1026 include/config/kernel.release: include/config/auto.conf FORCE
1027         $(call filechk,kernel.release)
1028
1029
1030 # Things we need to do before we recursively start building the kernel
1031 # or the modules are listed in "prepare".
1032 # A multi level approach is used. prepareN is processed before prepareN-1.
1033 # archprepare is used in arch Makefiles and when processed asm symlink,
1034 # version.h and scripts_basic is processed / created.
1035
1036 # Listed in dependency order
1037 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1038
1039 # prepare3 is used to check if we are building in a separate output directory,
1040 # and if so do:
1041 # 1) Check that make has not been executed in the kernel src $(srctree)
1042 prepare3: include/config/kernel.release
1043 ifneq ($(KBUILD_SRC),)
1044         @$(kecho) '  Using $(srctree) as source for kernel'
1045         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1046                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1047                 echo >&2 "  in the '$(srctree)' directory.";\
1048                 /bin/false; \
1049         fi;
1050 endif
1051
1052 # prepare2 creates a makefile if using a separate output directory.
1053 # From this point forward, .config has been reprocessed, so any rules
1054 # that need to depend on updated CONFIG_* values can be checked here.
1055 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1056
1057 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1058                    include/config/auto.conf
1059         $(cmd_crmodverdir)
1060
1061 archprepare: archheaders archscripts prepare1 scripts_basic
1062
1063 prepare0: archprepare gcc-plugins
1064         $(Q)$(MAKE) $(build)=.
1065
1066 # All the preparing..
1067 prepare: prepare0 prepare-objtool
1068
1069 PHONY += prepare-objtool
1070 prepare-objtool: $(objtool_target)
1071
1072 # Check for CONFIG flags that require compiler support. Abort the build
1073 # after .config has been processed, but before the kernel build starts.
1074 #
1075 # For security-sensitive CONFIG options, we don't want to fallback and/or
1076 # silently change which compiler flags will be used, since that leads to
1077 # producing kernels with different security feature characteristics
1078 # depending on the compiler used. (For example, "But I selected
1079 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1080 PHONY += prepare-compiler-check
1081 prepare-compiler-check: FORCE
1082 # Make sure compiler supports requested stack protector flag.
1083 ifdef stackp-name
1084   ifeq ($(call cc-option, $(stackp-flag)),)
1085         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1086                   $(stackp-flag) not supported by compiler >&2 && exit 1
1087   endif
1088 endif
1089 # Make sure compiler does not have buggy stack-protector support.
1090 ifdef stackp-check
1091   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1092         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1093                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1094   endif
1095 endif
1096         @:
1097
1098 # Generate some files
1099 # ---------------------------------------------------------------------------
1100
1101 # KERNELRELEASE can change from a few different places, meaning version.h
1102 # needs to be updated, so this check is forced on all builds
1103
1104 uts_len := 64
1105 define filechk_utsrelease.h
1106         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1107           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1108           exit 1;                                                         \
1109         fi;                                                               \
1110         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1111 endef
1112
1113 define filechk_version.h
1114         (echo \#define LINUX_VERSION_CODE $(shell                         \
1115         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1116         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1117 endef
1118
1119 $(version_h): $(srctree)/Makefile FORCE
1120         $(call filechk,version.h)
1121         $(Q)rm -f $(old_version_h)
1122
1123 include/generated/utsrelease.h: include/config/kernel.release FORCE
1124         $(call filechk,utsrelease.h)
1125
1126 PHONY += headerdep
1127 headerdep:
1128         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1129         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1130
1131 # ---------------------------------------------------------------------------
1132 # Kernel headers
1133
1134 #Default location for installed headers
1135 export INSTALL_HDR_PATH = $(objtree)/usr
1136
1137 # If we do an all arch process set dst to include/arch-$(hdr-arch)
1138 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
1139
1140 PHONY += archheaders
1141 archheaders:
1142
1143 PHONY += archscripts
1144 archscripts:
1145
1146 PHONY += __headers
1147 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1148         $(Q)$(MAKE) $(build)=scripts build_unifdef
1149
1150 PHONY += headers_install_all
1151 headers_install_all:
1152         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1153
1154 PHONY += headers_install
1155 headers_install: __headers
1156         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1157           $(error Headers not exportable for the $(SRCARCH) architecture))
1158         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1159         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
1160
1161 PHONY += headers_check_all
1162 headers_check_all: headers_install_all
1163         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1164
1165 PHONY += headers_check
1166 headers_check: headers_install
1167         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1168         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
1169
1170 # ---------------------------------------------------------------------------
1171 # Kernel selftest
1172
1173 PHONY += kselftest
1174 kselftest:
1175         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1176
1177 PHONY += kselftest-clean
1178 kselftest-clean:
1179         $(Q)$(MAKE) -C tools/testing/selftests clean
1180
1181 PHONY += kselftest-merge
1182 kselftest-merge:
1183         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1184         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1185                 -m $(objtree)/.config \
1186                 $(srctree)/tools/testing/selftests/*/config
1187         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1188
1189 # ---------------------------------------------------------------------------
1190 # Modules
1191
1192 ifdef CONFIG_MODULES
1193
1194 # By default, build modules as well
1195
1196 all: modules
1197
1198 # Build modules
1199 #
1200 # A module can be listed more than once in obj-m resulting in
1201 # duplicate lines in modules.order files.  Those are removed
1202 # using awk while concatenating to the final file.
1203
1204 PHONY += modules
1205 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1206         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1207         @$(kecho) '  Building modules, stage 2.';
1208         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1209
1210 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1211         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1212
1213 %/modules.builtin: include/config/auto.conf
1214         $(Q)$(MAKE) $(modbuiltin)=$*
1215
1216
1217 # Target to prepare building external modules
1218 PHONY += modules_prepare
1219 modules_prepare: prepare scripts
1220
1221 # Target to install modules
1222 PHONY += modules_install
1223 modules_install: _modinst_ _modinst_post
1224
1225 PHONY += _modinst_
1226 _modinst_:
1227         @rm -rf $(MODLIB)/kernel
1228         @rm -f $(MODLIB)/source
1229         @mkdir -p $(MODLIB)/kernel
1230         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1231         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1232                 rm -f $(MODLIB)/build ; \
1233                 ln -s $(CURDIR) $(MODLIB)/build ; \
1234         fi
1235         @cp -f $(objtree)/modules.order $(MODLIB)/
1236         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1237         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1238
1239 # This depmod is only for convenience to give the initial
1240 # boot a modules.dep even before / is mounted read-write.  However the
1241 # boot script depmod is the master version.
1242 PHONY += _modinst_post
1243 _modinst_post: _modinst_
1244         $(call cmd,depmod)
1245
1246 ifeq ($(CONFIG_MODULE_SIG), y)
1247 PHONY += modules_sign
1248 modules_sign:
1249         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1250 endif
1251
1252 else # CONFIG_MODULES
1253
1254 # Modules not configured
1255 # ---------------------------------------------------------------------------
1256
1257 PHONY += modules modules_install
1258 modules modules_install:
1259         @echo >&2
1260         @echo >&2 "The present kernel configuration has modules disabled."
1261         @echo >&2 "Type 'make config' and enable loadable module support."
1262         @echo >&2 "Then build a kernel with module support enabled."
1263         @echo >&2
1264         @exit 1
1265
1266 endif # CONFIG_MODULES
1267
1268 ###
1269 # Cleaning is done on three levels.
1270 # make clean     Delete most generated files
1271 #                Leave enough to build external modules
1272 # make mrproper  Delete the current configuration, and all generated files
1273 # make distclean Remove editor backup files, patch leftover files and the like
1274
1275 # Directories & files removed with 'make clean'
1276 CLEAN_DIRS  += $(MODVERDIR)
1277
1278 # Directories & files removed with 'make mrproper'
1279 MRPROPER_DIRS  += include/config usr/include include/generated          \
1280                   arch/*/include/generated .tmp_objdiff
1281 MRPROPER_FILES += .config .config.old .version .old_version \
1282                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1283                   signing_key.pem signing_key.priv signing_key.x509     \
1284                   x509.genkey extra_certificates signing_key.x509.keyid \
1285                   signing_key.x509.signer vmlinux-gdb.py
1286
1287 # clean - Delete most, but leave enough to build external modules
1288 #
1289 clean: rm-dirs  := $(CLEAN_DIRS)
1290 clean: rm-files := $(CLEAN_FILES)
1291 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1292
1293 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1294 $(clean-dirs):
1295         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1296
1297 vmlinuxclean:
1298         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1299         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1300
1301 clean: archclean vmlinuxclean
1302
1303 # mrproper - Delete all generated files, including .config
1304 #
1305 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1306 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1307 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1308
1309 PHONY += $(mrproper-dirs) mrproper archmrproper
1310 $(mrproper-dirs):
1311         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1312
1313 mrproper: clean archmrproper $(mrproper-dirs)
1314         $(call cmd,rmdirs)
1315         $(call cmd,rmfiles)
1316
1317 # distclean
1318 #
1319 PHONY += distclean
1320
1321 distclean: mrproper
1322         @find $(srctree) $(RCS_FIND_IGNORE) \
1323                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1324                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1325                 -o -name 'core' \) \
1326                 -type f -print | xargs rm -f
1327
1328
1329 # Packaging of the kernel to various formats
1330 # ---------------------------------------------------------------------------
1331 # rpm target kept for backward compatibility
1332 package-dir     := scripts/package
1333
1334 %src-pkg: FORCE
1335         $(Q)$(MAKE) $(build)=$(package-dir) $@
1336 %pkg: include/config/kernel.release FORCE
1337         $(Q)$(MAKE) $(build)=$(package-dir) $@
1338 rpm: include/config/kernel.release FORCE
1339         $(Q)$(MAKE) $(build)=$(package-dir) $@
1340
1341
1342 # Brief documentation of the typical targets used
1343 # ---------------------------------------------------------------------------
1344
1345 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1346 boards := $(sort $(notdir $(boards)))
1347 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1348 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1349
1350 PHONY += help
1351 help:
1352         @echo  'Cleaning targets:'
1353         @echo  '  clean           - Remove most generated files but keep the config and'
1354         @echo  '                    enough build support to build external modules'
1355         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1356         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1357         @echo  ''
1358         @echo  'Configuration targets:'
1359         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1360         @echo  ''
1361         @echo  'Other generic targets:'
1362         @echo  '  all             - Build all targets marked with [*]'
1363         @echo  '* vmlinux         - Build the bare kernel'
1364         @echo  '* modules         - Build all modules'
1365         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1366         @echo  '  dir/            - Build all files in dir and below'
1367         @echo  '  dir/file.[ois]  - Build specified target only'
1368         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1369         @echo  '                    (requires compiler support for LLVM assembly generation)'
1370         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1371         @echo  '                    (requires a recent binutils and recent build (System.map))'
1372         @echo  '  dir/file.ko     - Build module including final link'
1373         @echo  '  modules_prepare - Set up for building external modules'
1374         @echo  '  tags/TAGS       - Generate tags file for editors'
1375         @echo  '  cscope          - Generate cscope index'
1376         @echo  '  gtags           - Generate GNU GLOBAL index'
1377         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1378         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1379         @echo  '  image_name      - Output the image name (use with make -s)'
1380         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1381          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1382          echo  ''
1383         @echo  'Static analysers:'
1384         @echo  '  checkstack      - Generate a list of stack hogs'
1385         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1386         @echo  '  versioncheck    - Sanity check on version.h usage'
1387         @echo  '  includecheck    - Check for duplicate included header files'
1388         @echo  '  export_report   - List the usages of all exported symbols'
1389         @echo  '  headers_check   - Sanity check on exported headers'
1390         @echo  '  headerdep       - Detect inclusion cycles in headers'
1391         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1392         @echo  ''
1393         @echo  'Kernel selftest:'
1394         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1395         @echo  '                    Build, install, and boot kernel before'
1396         @echo  '                    running kselftest on it'
1397         @echo  '  kselftest-clean - Remove all generated kselftest files'
1398         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1399         @echo  '                    .config.'
1400         @echo  ''
1401         @echo 'Userspace tools targets:'
1402         @echo '  use "make tools/help"'
1403         @echo '  or  "cd tools; make help"'
1404         @echo  ''
1405         @echo  'Kernel packaging:'
1406         @$(MAKE) $(build)=$(package-dir) help
1407         @echo  ''
1408         @echo  'Documentation targets:'
1409         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1410         @echo  ''
1411         @echo  'Architecture specific targets ($(SRCARCH)):'
1412         @$(if $(archhelp),$(archhelp),\
1413                 echo '  No architecture specific help defined for $(SRCARCH)')
1414         @echo  ''
1415         @$(if $(boards), \
1416                 $(foreach b, $(boards), \
1417                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1418                 echo '')
1419         @$(if $(board-dirs), \
1420                 $(foreach b, $(board-dirs), \
1421                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1422                 printf "  %-16s - Show all of the above\\n" help-boards; \
1423                 echo '')
1424
1425         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1426         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1427         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1428         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1429         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1430         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1431         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1432         @echo  '                1: warnings which may be relevant and do not occur too often'
1433         @echo  '                2: warnings which occur quite often but may still be relevant'
1434         @echo  '                3: more obscure warnings, can most likely be ignored'
1435         @echo  '                Multiple levels can be combined with W=12 or W=123'
1436         @echo  ''
1437         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1438         @echo  'For further info see the ./README file'
1439
1440
1441 help-board-dirs := $(addprefix help-,$(board-dirs))
1442
1443 help-boards: $(help-board-dirs)
1444
1445 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1446
1447 $(help-board-dirs): help-%:
1448         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1449         @$(if $(boards-per-dir), \
1450                 $(foreach b, $(boards-per-dir), \
1451                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1452                 echo '')
1453
1454
1455 # Documentation targets
1456 # ---------------------------------------------------------------------------
1457 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
1458 PHONY += $(DOC_TARGETS)
1459 $(DOC_TARGETS): scripts_basic FORCE
1460         $(Q)$(MAKE) $(build)=Documentation $@
1461
1462 else # KBUILD_EXTMOD
1463
1464 ###
1465 # External module support.
1466 # When building external modules the kernel used as basis is considered
1467 # read-only, and no consistency checks are made and the make
1468 # system is not used on the basis kernel. If updates are required
1469 # in the basis kernel ordinary make commands (without M=...) must
1470 # be used.
1471 #
1472 # The following are the only valid targets when building external
1473 # modules.
1474 # make M=dir clean     Delete all automatically generated files
1475 # make M=dir modules   Make all modules in specified dir
1476 # make M=dir           Same as 'make M=dir modules'
1477 # make M=dir modules_install
1478 #                      Install the modules built in the module directory
1479 #                      Assumes install directory is already created
1480
1481 # We are always building modules
1482 KBUILD_MODULES := 1
1483 PHONY += crmodverdir
1484 crmodverdir:
1485         $(cmd_crmodverdir)
1486
1487 PHONY += $(objtree)/Module.symvers
1488 $(objtree)/Module.symvers:
1489         @test -e $(objtree)/Module.symvers || ( \
1490         echo; \
1491         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1492         echo "           is missing; modules will have no dependencies and modversions."; \
1493         echo )
1494
1495 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1496 PHONY += $(module-dirs) modules
1497 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1498         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1499
1500 modules: $(module-dirs)
1501         @$(kecho) '  Building modules, stage 2.';
1502         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1503
1504 PHONY += modules_install
1505 modules_install: _emodinst_ _emodinst_post
1506
1507 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1508 PHONY += _emodinst_
1509 _emodinst_:
1510         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1511         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1512
1513 PHONY += _emodinst_post
1514 _emodinst_post: _emodinst_
1515         $(call cmd,depmod)
1516
1517 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1518
1519 PHONY += $(clean-dirs) clean
1520 $(clean-dirs):
1521         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1522
1523 clean:  rm-dirs := $(MODVERDIR)
1524 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1525
1526 PHONY += help
1527 help:
1528         @echo  '  Building external modules.'
1529         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1530         @echo  ''
1531         @echo  '  modules         - default target, build the module(s)'
1532         @echo  '  modules_install - install the module'
1533         @echo  '  clean           - remove generated files in module directory only'
1534         @echo  ''
1535
1536 # Dummies...
1537 PHONY += prepare scripts
1538 prepare: ;
1539 scripts: ;
1540 endif # KBUILD_EXTMOD
1541
1542 clean: $(clean-dirs)
1543         $(call cmd,rmdirs)
1544         $(call cmd,rmfiles)
1545         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1546                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1547                 -o -name '*.ko.*' \
1548                 -o -name '*.dwo'  \
1549                 -o -name '*.su'  \
1550                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1551                 -o -name '*.symtypes' -o -name 'modules.order' \
1552                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1553                 -o -name '*.c.[012]*.*' \
1554                 -o -name '*.ll' \
1555                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1556
1557 # Generate tags for editors
1558 # ---------------------------------------------------------------------------
1559 quiet_cmd_tags = GEN     $@
1560       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1561
1562 tags TAGS cscope gtags: FORCE
1563         $(call cmd,tags)
1564
1565 # Scripts to check various things for consistency
1566 # ---------------------------------------------------------------------------
1567
1568 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1569
1570 includecheck:
1571         find $(srctree)/* $(RCS_FIND_IGNORE) \
1572                 -name '*.[hcS]' -type f -print | sort \
1573                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1574
1575 versioncheck:
1576         find $(srctree)/* $(RCS_FIND_IGNORE) \
1577                 -name '*.[hcS]' -type f -print | sort \
1578                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1579
1580 coccicheck:
1581         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1582
1583 namespacecheck:
1584         $(PERL) $(srctree)/scripts/namespace.pl
1585
1586 export_report:
1587         $(PERL) $(srctree)/scripts/export_report.pl
1588
1589 endif #ifeq ($(config-targets),1)
1590 endif #ifeq ($(mixed-targets),1)
1591
1592 PHONY += checkstack kernelrelease kernelversion image_name
1593
1594 # UML needs a little special treatment here.  It wants to use the host
1595 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1596 # else wants $(ARCH), including people doing cross-builds, which means
1597 # that $(SUBARCH) doesn't work here.
1598 ifeq ($(ARCH), um)
1599 CHECKSTACK_ARCH := $(SUBARCH)
1600 else
1601 CHECKSTACK_ARCH := $(ARCH)
1602 endif
1603 checkstack:
1604         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1605         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1606
1607 kernelrelease:
1608         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1609
1610 kernelversion:
1611         @echo $(KERNELVERSION)
1612
1613 image_name:
1614         @echo $(KBUILD_IMAGE)
1615
1616 # Clear a bunch of variables before executing the submake
1617 tools/: FORCE
1618         $(Q)mkdir -p $(objtree)/tools
1619         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1620
1621 tools/%: FORCE
1622         $(Q)mkdir -p $(objtree)/tools
1623         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1624
1625 # Single targets
1626 # ---------------------------------------------------------------------------
1627 # Single targets are compatible with:
1628 # - build with mixed source and output
1629 # - build with separate output dir 'make O=...'
1630 # - external modules
1631 #
1632 #  target-dir => where to store outputfile
1633 #  build-dir  => directory in kernel source tree to use
1634
1635 ifeq ($(KBUILD_EXTMOD),)
1636         build-dir  = $(patsubst %/,%,$(dir $@))
1637         target-dir = $(dir $@)
1638 else
1639         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1640         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1641         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1642 endif
1643
1644 %.s: %.c prepare scripts FORCE
1645         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1646 %.i: %.c prepare scripts FORCE
1647         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1648 %.o: %.c prepare scripts FORCE
1649         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1650 %.lst: %.c prepare scripts FORCE
1651         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1652 %.s: %.S prepare scripts FORCE
1653         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1654 %.o: %.S prepare scripts FORCE
1655         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1656 %.symtypes: %.c prepare scripts FORCE
1657         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1658 %.ll: %.c prepare scripts FORCE
1659         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1660
1661 # Modules
1662 /: prepare scripts FORCE
1663         $(cmd_crmodverdir)
1664         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1665         $(build)=$(build-dir)
1666 # Make sure the latest headers are built for Documentation
1667 Documentation/ samples/: headers_install
1668 %/: prepare scripts FORCE
1669         $(cmd_crmodverdir)
1670         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1671         $(build)=$(build-dir)
1672 %.ko: prepare scripts FORCE
1673         $(cmd_crmodverdir)
1674         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1675         $(build)=$(build-dir) $(@:.ko=.o)
1676         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1677
1678 # FIXME Should go into a make.lib or something
1679 # ===========================================================================
1680
1681 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1682       cmd_rmdirs = rm -rf $(rm-dirs)
1683
1684 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1685       cmd_rmfiles = rm -f $(rm-files)
1686
1687 # Run depmod only if we have System.map and depmod is executable
1688 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1689       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1690                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1691
1692 # Create temporary dir for module support files
1693 # clean it up only when building all modules
1694 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1695                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1696
1697 # read all saved command lines
1698
1699 targets := $(wildcard $(sort $(targets)))
1700 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1701
1702 ifneq ($(cmd_files),)
1703   $(cmd_files): ;       # Do not try to update included dependency files
1704   include $(cmd_files)
1705 endif
1706
1707 endif   # skip-makefile
1708
1709 PHONY += FORCE
1710 FORCE:
1711
1712 # Declare the contents of the .PHONY variable as phony.  We keep that
1713 # information in a variable so we can use it in if_changed and friends.
1714 .PHONY: $(PHONY)