Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 12
   3 SUBLEVEL = 0
   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 ($(findstring s,$(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 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 134                                                                 && /bin/pwd)
 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 HOSTCC       = gcc
 298 HOSTCXX      = g++
 299 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 300 HOSTCXXFLAGS = -O2
 301
 302 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 303 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 304                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 305 endif
 306
 307 # Decide whether to build built-in, modular, or both.
 308 # Normally, just do built-in.
 309
 310 KBUILD_MODULES :=
 311 KBUILD_BUILTIN := 1
 312
 313 # If we have only "make modules", don't compile built-in objects.
 314 # When we're building modules with modversions, we need to consider
 315 # the built-in objects during the descend as well, in order to
 316 # make sure the checksums are up to date before we record them.
 317
 318 ifeq ($(MAKECMDGOALS),modules)
 319   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 320 endif
 321
 322 # If we have "make <whatever> modules", compile modules
 323 # in addition to whatever we do anyway.
 324 # Just "make" or "make all" shall build modules as well
 325
 326 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 327   KBUILD_MODULES := 1
 328 endif
 329
 330 ifeq ($(MAKECMDGOALS),)
 331   KBUILD_MODULES := 1
 332 endif
 333
 334 export KBUILD_MODULES KBUILD_BUILTIN
 335 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 336
 337 # We need some generic definitions (do not try to remake the file).
 338 scripts/Kbuild.include: ;
 339 include scripts/Kbuild.include
 340
 341 # Make variables (CC, etc...)
 342 AS              = $(CROSS_COMPILE)as
 343 LD              = $(CROSS_COMPILE)ld
 344 CC              = $(CROSS_COMPILE)gcc
 345 CPP             = $(CC) -E
 346 AR              = $(CROSS_COMPILE)ar
 347 NM              = $(CROSS_COMPILE)nm
 348 STRIP           = $(CROSS_COMPILE)strip
 349 OBJCOPY         = $(CROSS_COMPILE)objcopy
 350 OBJDUMP         = $(CROSS_COMPILE)objdump
 351 AWK             = awk
 352 GENKSYMS        = scripts/genksyms/genksyms
 353 INSTALLKERNEL  := installkernel
 354 DEPMOD          = /sbin/depmod
 355 PERL            = perl
 356 PYTHON          = python
 357 CHECK           = sparse
 358
 359 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 360                   -Wbitwise -Wno-return-void $(CF)
 361 NOSTDINC_FLAGS  =
 362 CFLAGS_MODULE   =
 363 AFLAGS_MODULE   =
 364 LDFLAGS_MODULE  =
 365 CFLAGS_KERNEL   =
 366 AFLAGS_KERNEL   =
 367 LDFLAGS_vmlinux =
 368 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 369 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 370
 371
 372 # Use USERINCLUDE when you must reference the UAPI directories only.
 373 USERINCLUDE    := \
 374                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 375                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 376                 -I$(srctree)/include/uapi \
 377                 -I$(objtree)/include/generated/uapi \
 378                 -include $(srctree)/include/linux/kconfig.h
 379
 380 # Use LINUXINCLUDE when you must reference the include/ directory.
 381 # Needed to be compatible with the O= option
 382 LINUXINCLUDE    := \
 383                 -I$(srctree)/arch/$(hdr-arch)/include \
 384                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 385                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 386                 -I$(objtree)/include \
 387                 $(USERINCLUDE)
 388
 389 KBUILD_CPPFLAGS := -D__KERNEL__
 390
 391 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 392                    -fno-strict-aliasing -fno-common \
 393                    -Werror-implicit-function-declaration \
 394                    -Wno-format-security \
 395                    -std=gnu89 $(call cc-option,-fno-PIE)
 396
 397
 398 KBUILD_AFLAGS_KERNEL :=
 399 KBUILD_CFLAGS_KERNEL :=
 400 KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
 401 KBUILD_AFLAGS_MODULE  := -DMODULE
 402 KBUILD_CFLAGS_MODULE  := -DMODULE
 403 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 404
 405 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 406 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 407 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 408
 409 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 410 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 411 export CPP AR NM STRIP OBJCOPY OBJDUMP
 412 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 413 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 414
 415 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 416 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
 417 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 418 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 419 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 420 export KBUILD_ARFLAGS
 421
 422 # When compiling out-of-tree modules, put MODVERDIR in the module
 423 # tree rather than in the kernel tree. The kernel tree might
 424 # even be read-only.
 425 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 426
 427 # Files to ignore in find ... statements
 428
 429 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 430                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 431                           -prune -o
 432 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 433                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 434
 435 # ===========================================================================
 436 # Rules shared between *config targets and build targets
 437
 438 # Basic helpers built in scripts/
 439 PHONY += scripts_basic
 440 scripts_basic:
 441         $(Q)$(MAKE) $(build)=scripts/basic
 442         $(Q)rm -f .tmp_quiet_recordmcount
 443
 444 # To avoid any implicit rule to kick in, define an empty command.
 445 scripts/basic/%: scripts_basic ;
 446
 447 PHONY += outputmakefile
 448 # outputmakefile generates a Makefile in the output directory, if using a
 449 # separate output directory. This allows convenient use of make in the
 450 # output directory.
 451 outputmakefile:
 452 ifneq ($(KBUILD_SRC),)
 453         $(Q)ln -fsn $(srctree) source
 454         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 455             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 456 endif
 457
 458 # Support for using generic headers in asm-generic
 459 PHONY += asm-generic
 460 asm-generic:
 461         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 462                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 463         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 464                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 465
 466 # To make sure we do not include .config for any of the *config targets
 467 # catch them early, and hand them over to scripts/kconfig/Makefile
 468 # It is allowed to specify more targets when calling make, including
 469 # mixing *config targets and build targets.
 470 # For example 'make oldconfig all'.
 471 # Detect when mixed targets is specified, and make a second invocation
 472 # of make so .config is not included in this case either (for *config).
 473
 474 version_h := include/generated/uapi/linux/version.h
 475 old_version_h := include/linux/version.h
 476
 477 no-dot-config-targets := clean mrproper distclean \
 478                          cscope gtags TAGS tags help% %docs check% coccicheck \
 479                          $(version_h) headers_% archheaders archscripts \
 480                          kernelversion %src-pkg
 481
 482 config-targets := 0
 483 mixed-targets  := 0
 484 dot-config     := 1
 485
 486 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 487         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 488                 dot-config := 0
 489         endif
 490 endif
 491
 492 ifeq ($(KBUILD_EXTMOD),)
 493         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 494                 config-targets := 1
 495                 ifneq ($(words $(MAKECMDGOALS)),1)
 496                         mixed-targets := 1
 497                 endif
 498         endif
 499 endif
 500 # install and module_install need also be processed one by one
 501 ifneq ($(filter install,$(MAKECMDGOALS)),)
 502         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 503                 mixed-targets := 1
 504         endif
 505 endif
 506
 507 ifeq ($(mixed-targets),1)
 508 # ===========================================================================
 509 # We're called with mixed targets (*config and build targets).
 510 # Handle them one by one.
 511
 512 PHONY += $(MAKECMDGOALS) __build_one_by_one
 513
 514 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 515         @:
 516
 517 __build_one_by_one:
 518         $(Q)set -e; \
 519         for i in $(MAKECMDGOALS); do \
 520                 $(MAKE) -f $(srctree)/Makefile $$i; \
 521         done
 522
 523 else
 524 ifeq ($(config-targets),1)
 525 # ===========================================================================
 526 # *config targets only - make sure prerequisites are updated, and descend
 527 # in scripts/kconfig to make the *config target
 528
 529 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 530 # KBUILD_DEFCONFIG may point out an alternative default configuration
 531 # used for 'make defconfig'
 532 include arch/$(SRCARCH)/Makefile
 533 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 534
 535 config: scripts_basic outputmakefile FORCE
 536         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 537
 538 %config: scripts_basic outputmakefile FORCE
 539         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 540
 541 else
 542 # ===========================================================================
 543 # Build targets only - this includes vmlinux, arch specific targets, clean
 544 # targets and others. In general all targets except *config targets.
 545
 546 ifeq ($(KBUILD_EXTMOD),)
 547 # Additional helpers built in scripts/
 548 # Carefully list dependencies so we do not try to build scripts twice
 549 # in parallel
 550 PHONY += scripts
 551 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 552          asm-generic gcc-plugins
 553         $(Q)$(MAKE) $(build)=$(@)
 554
 555 # Objects we will link into vmlinux / subdirs we need to visit
 556 init-y          := init/
 557 drivers-y       := drivers/ sound/ firmware/
 558 net-y           := net/
 559 libs-y          := lib/
 560 core-y          := usr/
 561 virt-y          := virt/
 562 endif # KBUILD_EXTMOD
 563
 564 ifeq ($(dot-config),1)
 565 # Read in config
 566 -include include/config/auto.conf
 567
 568 ifeq ($(KBUILD_EXTMOD),)
 569 # Read in dependencies to all Kconfig* files, make sure to run
 570 # oldconfig if changes are detected.
 571 -include include/config/auto.conf.cmd
 572
 573 # To avoid any implicit rule to kick in, define an empty command
 574 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 575
 576 # If .config is newer than include/config/auto.conf, someone tinkered
 577 # with it and forgot to run make oldconfig.
 578 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 579 # we execute the config step to be sure to catch updated Kconfig files
 580 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 581         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 582 else
 583 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 584 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 585 PHONY += include/config/auto.conf
 586
 587 include/config/auto.conf:
 588         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 589         echo >&2;                                                       \
 590         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 591         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 592         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 593         echo >&2 ;                                                      \
 594         /bin/false)
 595
 596 endif # KBUILD_EXTMOD
 597
 598 else
 599 # Dummy target needed, because used as prerequisite
 600 include/config/auto.conf: ;
 601 endif # $(dot-config)
 602
 603 # For the kernel to actually contain only the needed exported symbols,
 604 # we have to build modules as well to determine what those symbols are.
 605 # (this can be evaluated only once include/config/auto.conf has been included)
 606 ifdef CONFIG_TRIM_UNUSED_KSYMS
 607   KBUILD_MODULES := 1
 608 endif
 609
 610 # The all: target is the default when no target is given on the
 611 # command line.
 612 # This allow a user to issue only 'make' to build a kernel including modules
 613 # Defaults to vmlinux, but the arch makefile usually adds further targets
 614 all: vmlinux
 615
 616 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 617 # values of the respective KBUILD_* variables
 618 ARCH_CPPFLAGS :=
 619 ARCH_AFLAGS :=
 620 ARCH_CFLAGS :=
 621 include arch/$(SRCARCH)/Makefile
 622
 623 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 624 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 625
 626 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 627 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 628 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 629 else
 630 ifdef CONFIG_PROFILE_ALL_BRANCHES
 631 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 632 else
 633 KBUILD_CFLAGS   += -O2
 634 endif
 635 endif
 636
 637 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 638                         $(call cc-disable-warning,maybe-uninitialized,))
 639
 640 # Tell gcc to never replace conditional load with a non-conditional one
 641 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 642
 643 # check for 'asm goto'
 644 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 645         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 646         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 647 endif
 648
 649 include scripts/Makefile.gcc-plugins
 650
 651 ifdef CONFIG_READABLE_ASM
 652 # Disable optimizations that make assembler listings hard to read.
 653 # reorder blocks reorders the control in the function
 654 # ipa clone creates specialized cloned functions
 655 # partial inlining inlines only parts of functions
 656 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 657                  $(call cc-option,-fno-ipa-cp-clone,) \
 658                  $(call cc-option,-fno-partial-inlining)
 659 endif
 660
 661 ifneq ($(CONFIG_FRAME_WARN),0)
 662 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 663 endif
 664
 665 # This selects the stack protector compiler flag. Testing it is delayed
 666 # until after .config has been reprocessed, in the prepare-compiler-check
 667 # target.
 668 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 669   stackp-flag := -fstack-protector
 670   stackp-name := REGULAR
 671 else
 672 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 673   stackp-flag := -fstack-protector-strong
 674   stackp-name := STRONG
 675 else
 676   # Force off for distro compilers that enable stack protector by default.
 677   stackp-flag := $(call cc-option, -fno-stack-protector)
 678 endif
 679 endif
 680 # Find arch-specific stack protector compiler sanity-checking script.
 681 ifdef CONFIG_CC_STACKPROTECTOR
 682   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 683   stackp-check := $(wildcard $(stackp-path))
 684 endif
 685 KBUILD_CFLAGS += $(stackp-flag)
 686
 687 ifeq ($(cc-name),clang)
 688 ifneq ($(CROSS_COMPILE),)
 689 CLANG_TARGET    := -target $(notdir $(CROSS_COMPILE:%-=%))
 690 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 691 endif
 692 ifneq ($(GCC_TOOLCHAIN),)
 693 CLANG_GCC_TC    := -gcc-toolchain $(GCC_TOOLCHAIN)
 694 endif
 695 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 696 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 697 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 698 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 699 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 700 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 701 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 702 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 703 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 704 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 705 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 706 # See modpost pattern 2
 707 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 708 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 709 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 710 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 711 else
 712
 713 # These warnings generated too much noise in a regular build.
 714 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 715 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 716 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 717 endif
 718
 719 ifdef CONFIG_FRAME_POINTER
 720 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 721 else
 722 # Some targets (ARM with Thumb2, for example), can't be built with frame
 723 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 724 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 725 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 726 # -fomit-frame-pointer with FUNCTION_TRACER.
 727 ifndef CONFIG_FUNCTION_TRACER
 728 KBUILD_CFLAGS   += -fomit-frame-pointer
 729 endif
 730 endif
 731
 732 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 733
 734 ifdef CONFIG_DEBUG_INFO
 735 ifdef CONFIG_DEBUG_INFO_SPLIT
 736 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 737 else
 738 KBUILD_CFLAGS   += -g
 739 endif
 740 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 741 endif
 742 ifdef CONFIG_DEBUG_INFO_DWARF4
 743 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 744 endif
 745
 746 ifdef CONFIG_DEBUG_INFO_REDUCED
 747 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 748                    $(call cc-option,-fno-var-tracking)
 749 endif
 750
 751 ifdef CONFIG_FUNCTION_TRACER
 752 ifndef CC_FLAGS_FTRACE
 753 CC_FLAGS_FTRACE := -pg
 754 endif
 755 export CC_FLAGS_FTRACE
 756 ifdef CONFIG_HAVE_FENTRY
 757 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 758 endif
 759 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 760 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 761 ifdef CONFIG_DYNAMIC_FTRACE
 762         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 763                 BUILD_C_RECORDMCOUNT := y
 764                 export BUILD_C_RECORDMCOUNT
 765         endif
 766 endif
 767 endif
 768
 769 # We trigger additional mismatches with less inlining
 770 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 771 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 772 endif
 773
 774 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 775 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 776 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 777 endif
 778
 779 # arch Makefile may override CC so keep this after arch Makefile is included
 780 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 781 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 782
 783 # warn about C99 declaration after statement
 784 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 785
 786 # disable pointer signed / unsigned warnings in gcc 4.0
 787 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 788
 789 # disable invalid "can't wrap" optimizations for signed / pointers
 790 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 791
 792 # conserve stack if available
 793 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 794
 795 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 796 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 797
 798 # require functions to have arguments in prototypes, not empty 'int foo()'
 799 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 800
 801 # Prohibit date/time macros, which would make the build non-deterministic
 802 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 803
 804 # enforce correct pointer usage
 805 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 806
 807 # Require designated initializers for all marked structures
 808 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 809
 810 # use the deterministic mode of AR if available
 811 KBUILD_ARFLAGS := $(call ar-option,D)
 812
 813 include scripts/Makefile.kasan
 814 include scripts/Makefile.extrawarn
 815 include scripts/Makefile.ubsan
 816
 817 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 818 # last assignments
 819 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 820 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 821 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 822
 823 # Use --build-id when available.
 824 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 825                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 826 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 827 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 828
 829 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 830 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 831 endif
 832
 833 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 834 LDFLAGS_vmlinux += $(call ld-option, -X,)
 835 endif
 836
 837 # Default kernel image to build when no specific target is given.
 838 # KBUILD_IMAGE may be overruled on the command line or
 839 # set in the environment
 840 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 841 # this default value
 842 export KBUILD_IMAGE ?= vmlinux
 843
 844 #
 845 # INSTALL_PATH specifies where to place the updated kernel and system map
 846 # images. Default is /boot, but you can set it to other values
 847 export  INSTALL_PATH ?= /boot
 848
 849 #
 850 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 851 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 852 # an argument if needed. Otherwise it defaults to the kernel install path
 853 #
 854 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 855
 856 #
 857 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 858 # relocations required by build roots.  This is not defined in the
 859 # makefile but the argument can be passed to make if needed.
 860 #
 861
 862 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 863 export MODLIB
 864
 865 #
 866 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 867 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 868 # the default option --strip-debug will be used.  Otherwise,
 869 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 870
 871 ifdef INSTALL_MOD_STRIP
 872 ifeq ($(INSTALL_MOD_STRIP),1)
 873 mod_strip_cmd = $(STRIP) --strip-debug
 874 else
 875 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 876 endif # INSTALL_MOD_STRIP=1
 877 else
 878 mod_strip_cmd = true
 879 endif # INSTALL_MOD_STRIP
 880 export mod_strip_cmd
 881
 882 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 883 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 884 # or CONFIG_MODULE_COMPRESS_XZ.
 885
 886 mod_compress_cmd = true
 887 ifdef CONFIG_MODULE_COMPRESS
 888   ifdef CONFIG_MODULE_COMPRESS_GZIP
 889     mod_compress_cmd = gzip -n -f
 890   endif # CONFIG_MODULE_COMPRESS_GZIP
 891   ifdef CONFIG_MODULE_COMPRESS_XZ
 892     mod_compress_cmd = xz -f
 893   endif # CONFIG_MODULE_COMPRESS_XZ
 894 endif # CONFIG_MODULE_COMPRESS
 895 export mod_compress_cmd
 896
 897 # Select initial ramdisk compression format, default is gzip(1).
 898 # This shall be used by the dracut(8) tool while creating an initramfs image.
 899 #
 900 INITRD_COMPRESS-y                  := gzip
 901 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 902 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 903 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 904 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 905 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 906 # do not export INITRD_COMPRESS, since we didn't actually
 907 # choose a sane default compression above.
 908 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 909
 910 ifdef CONFIG_MODULE_SIG_ALL
 911 $(eval $(call config_filename,MODULE_SIG_KEY))
 912
 913 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 914 else
 915 mod_sign_cmd = true
 916 endif
 917 export mod_sign_cmd
 918
 919 ifdef CONFIG_STACK_VALIDATION
 920   has_libelf := $(call try-run,\
 921                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 922   ifeq ($(has_libelf),1)
 923     objtool_target := tools/objtool FORCE
 924   else
 925     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 926     SKIP_STACK_VALIDATION := 1
 927     export SKIP_STACK_VALIDATION
 928   endif
 929 endif
 930
 931
 932 ifeq ($(KBUILD_EXTMOD),)
 933 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 934
 935 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 936                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 937                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 938
 939 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 940                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 941
 942 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 943 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 944 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 945 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 946 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 947 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
 948 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 949
 950 # Externally visible symbols (used by link-vmlinux.sh)
 951 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 952 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 953 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 954 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 955 export LDFLAGS_vmlinux
 956 # used by scripts/pacmage/Makefile
 957 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 958
 959 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 960
 961 # Include targets which we want to execute sequentially if the rest of the
 962 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 963 # evaluated more than once.
 964 PHONY += vmlinux_prereq
 965 vmlinux_prereq: $(vmlinux-deps) FORCE
 966 ifdef CONFIG_HEADERS_CHECK
 967         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 968 endif
 969 ifdef CONFIG_GDB_SCRIPTS
 970         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 971 endif
 972 ifdef CONFIG_TRIM_UNUSED_KSYMS
 973         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 974           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 975 endif
 976
 977 # standalone target for easier testing
 978 include/generated/autoksyms.h: FORCE
 979         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 980
 981 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 982
 983 # Final link of vmlinux with optional arch pass after final link
 984     cmd_link-vmlinux =                                                 \
 985         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
 986         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 987
 988 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
 989         +$(call if_changed,link-vmlinux)
 990
 991 # Build samples along the rest of the kernel
 992 ifdef CONFIG_SAMPLES
 993 vmlinux-dirs += samples
 994 endif
 995
 996 # The actual objects are generated when descending,
 997 # make sure no implicit rule kicks in
 998 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 999
1000 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1001 # Preset locale variables to speed up the build process. Limit locale
1002 # tweaks to this spot to avoid wrong language settings when running
1003 # make menuconfig etc.
1004 # Error messages still appears in the original language
1005
1006 PHONY += $(vmlinux-dirs)
1007 $(vmlinux-dirs): prepare scripts
1008         $(Q)$(MAKE) $(build)=$@
1009
1010 define filechk_kernel.release
1011         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1012 endef
1013
1014 # Store (new) KERNELRELEASE string in include/config/kernel.release
1015 include/config/kernel.release: include/config/auto.conf FORCE
1016         $(call filechk,kernel.release)
1017
1018
1019 # Things we need to do before we recursively start building the kernel
1020 # or the modules are listed in "prepare".
1021 # A multi level approach is used. prepareN is processed before prepareN-1.
1022 # archprepare is used in arch Makefiles and when processed asm symlink,
1023 # version.h and scripts_basic is processed / created.
1024
1025 # Listed in dependency order
1026 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1027
1028 # prepare3 is used to check if we are building in a separate output directory,
1029 # and if so do:
1030 # 1) Check that make has not been executed in the kernel src $(srctree)
1031 prepare3: include/config/kernel.release
1032 ifneq ($(KBUILD_SRC),)
1033         @$(kecho) '  Using $(srctree) as source for kernel'
1034         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1035                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1036                 echo >&2 "  in the '$(srctree)' directory.";\
1037                 /bin/false; \
1038         fi;
1039 endif
1040
1041 # prepare2 creates a makefile if using a separate output directory.
1042 # From this point forward, .config has been reprocessed, so any rules
1043 # that need to depend on updated CONFIG_* values can be checked here.
1044 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1045
1046 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1047                    include/config/auto.conf
1048         $(cmd_crmodverdir)
1049
1050 archprepare: archheaders archscripts prepare1 scripts_basic
1051
1052 prepare0: archprepare gcc-plugins
1053         $(Q)$(MAKE) $(build)=.
1054
1055 # All the preparing..
1056 prepare: prepare0 prepare-objtool
1057
1058 PHONY += prepare-objtool
1059 prepare-objtool: $(objtool_target)
1060
1061 # Check for CONFIG flags that require compiler support. Abort the build
1062 # after .config has been processed, but before the kernel build starts.
1063 #
1064 # For security-sensitive CONFIG options, we don't want to fallback and/or
1065 # silently change which compiler flags will be used, since that leads to
1066 # producing kernels with different security feature characteristics
1067 # depending on the compiler used. (For example, "But I selected
1068 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1069 PHONY += prepare-compiler-check
1070 prepare-compiler-check: FORCE
1071 # Make sure compiler supports requested stack protector flag.
1072 ifdef stackp-name
1073   ifeq ($(call cc-option, $(stackp-flag)),)
1074         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1075                   $(stackp-flag) not supported by compiler >&2 && exit 1
1076   endif
1077 endif
1078 # Make sure compiler does not have buggy stack-protector support.
1079 ifdef stackp-check
1080   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1081         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1082                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1083   endif
1084 endif
1085         @:
1086
1087 # Generate some files
1088 # ---------------------------------------------------------------------------
1089
1090 # KERNELRELEASE can change from a few different places, meaning version.h
1091 # needs to be updated, so this check is forced on all builds
1092
1093 uts_len := 64
1094 define filechk_utsrelease.h
1095         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1096           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1097           exit 1;                                                         \
1098         fi;                                                               \
1099         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1100 endef
1101
1102 define filechk_version.h
1103         (echo \#define LINUX_VERSION_CODE $(shell                         \
1104         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1105         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1106 endef
1107
1108 $(version_h): $(srctree)/Makefile FORCE
1109         $(call filechk,version.h)
1110         $(Q)rm -f $(old_version_h)
1111
1112 include/generated/utsrelease.h: include/config/kernel.release FORCE
1113         $(call filechk,utsrelease.h)
1114
1115 PHONY += headerdep
1116 headerdep:
1117         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1118         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1119
1120 # ---------------------------------------------------------------------------
1121 # Firmware install
1122 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1123 export INSTALL_FW_PATH
1124
1125 PHONY += firmware_install
1126 firmware_install:
1127         @mkdir -p $(objtree)/firmware
1128         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1129
1130 # ---------------------------------------------------------------------------
1131 # Kernel headers
1132
1133 #Default location for installed headers
1134 export INSTALL_HDR_PATH = $(objtree)/usr
1135
1136 # If we do an all arch process set dst to asm-$(hdr-arch)
1137 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
1138
1139 PHONY += archheaders
1140 archheaders:
1141
1142 PHONY += archscripts
1143 archscripts:
1144
1145 PHONY += __headers
1146 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1147         $(Q)$(MAKE) $(build)=scripts build_unifdef
1148
1149 PHONY += headers_install_all
1150 headers_install_all:
1151         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1152
1153 PHONY += headers_install
1154 headers_install: __headers
1155         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1156           $(error Headers not exportable for the $(SRCARCH) architecture))
1157         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1158         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
1159
1160 PHONY += headers_check_all
1161 headers_check_all: headers_install_all
1162         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1163
1164 PHONY += headers_check
1165 headers_check: headers_install
1166         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1167         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
1168
1169 # ---------------------------------------------------------------------------
1170 # Kernel selftest
1171
1172 PHONY += kselftest
1173 kselftest:
1174         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1175
1176 kselftest-clean:
1177         $(Q)$(MAKE) -C tools/testing/selftests clean
1178
1179 PHONY += kselftest-merge
1180 kselftest-merge:
1181         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1182         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1183                 -m $(objtree)/.config \
1184                 $(srctree)/tools/testing/selftests/*/config
1185         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1186
1187 # ---------------------------------------------------------------------------
1188 # Modules
1189
1190 ifdef CONFIG_MODULES
1191
1192 # By default, build modules as well
1193
1194 all: modules
1195
1196 # Build modules
1197 #
1198 # A module can be listed more than once in obj-m resulting in
1199 # duplicate lines in modules.order files.  Those are removed
1200 # using awk while concatenating to the final file.
1201
1202 PHONY += modules
1203 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1204         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1205         @$(kecho) '  Building modules, stage 2.';
1206         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1207         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1208
1209 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1210         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1211
1212 %/modules.builtin: include/config/auto.conf
1213         $(Q)$(MAKE) $(modbuiltin)=$*
1214
1215
1216 # Target to prepare building external modules
1217 PHONY += modules_prepare
1218 modules_prepare: prepare scripts
1219
1220 # Target to install modules
1221 PHONY += modules_install
1222 modules_install: _modinst_ _modinst_post
1223
1224 PHONY += _modinst_
1225 _modinst_:
1226         @rm -rf $(MODLIB)/kernel
1227         @rm -f $(MODLIB)/source
1228         @mkdir -p $(MODLIB)/kernel
1229         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1230         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1231                 rm -f $(MODLIB)/build ; \
1232                 ln -s $(CURDIR) $(MODLIB)/build ; \
1233         fi
1234         @cp -f $(objtree)/modules.order $(MODLIB)/
1235         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1236         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1237
1238 # This depmod is only for convenience to give the initial
1239 # boot a modules.dep even before / is mounted read-write.  However the
1240 # boot script depmod is the master version.
1241 PHONY += _modinst_post
1242 _modinst_post: _modinst_
1243         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_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  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1367         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1368         @echo  '  dir/            - Build all files in dir and below'
1369         @echo  '  dir/file.[ois]  - Build specified target only'
1370         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1371         @echo  '                    (requires compiler support for LLVM assembly generation)'
1372         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1373         @echo  '                    (requires a recent binutils and recent build (System.map))'
1374         @echo  '  dir/file.ko     - Build module including final link'
1375         @echo  '  modules_prepare - Set up for building external modules'
1376         @echo  '  tags/TAGS       - Generate tags file for editors'
1377         @echo  '  cscope          - Generate cscope index'
1378         @echo  '  gtags           - Generate GNU GLOBAL index'
1379         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1380         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1381         @echo  '  image_name      - Output the image name (use with make -s)'
1382         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1383          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1384          echo  ''
1385         @echo  'Static analysers:'
1386         @echo  '  checkstack      - Generate a list of stack hogs'
1387         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1388         @echo  '  versioncheck    - Sanity check on version.h usage'
1389         @echo  '  includecheck    - Check for duplicate included header files'
1390         @echo  '  export_report   - List the usages of all exported symbols'
1391         @echo  '  headers_check   - Sanity check on exported headers'
1392         @echo  '  headerdep       - Detect inclusion cycles in headers'
1393         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1394         @echo  ''
1395         @echo  'Kernel selftest:'
1396         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1397         @echo  '                    Build, install, and boot kernel before'
1398         @echo  '                    running kselftest on it'
1399         @echo  '  kselftest-clean - Remove all generated kselftest files'
1400         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1401         @echo  '                    .config.'
1402         @echo  ''
1403         @echo 'Userspace tools targets:'
1404         @echo '  use "make tools/help"'
1405         @echo '  or  "cd tools; make help"'
1406         @echo  ''
1407         @echo  'Kernel packaging:'
1408         @$(MAKE) $(build)=$(package-dir) help
1409         @echo  ''
1410         @echo  'Documentation targets:'
1411         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1412         @echo  ''
1413         @echo  'Architecture specific targets ($(SRCARCH)):'
1414         @$(if $(archhelp),$(archhelp),\
1415                 echo '  No architecture specific help defined for $(SRCARCH)')
1416         @echo  ''
1417         @$(if $(boards), \
1418                 $(foreach b, $(boards), \
1419                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1420                 echo '')
1421         @$(if $(board-dirs), \
1422                 $(foreach b, $(board-dirs), \
1423                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1424                 printf "  %-16s - Show all of the above\\n" help-boards; \
1425                 echo '')
1426
1427         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1428         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1429         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1430         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1431         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1432         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1433         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1434         @echo  '                1: warnings which may be relevant and do not occur too often'
1435         @echo  '                2: warnings which occur quite often but may still be relevant'
1436         @echo  '                3: more obscure warnings, can most likely be ignored'
1437         @echo  '                Multiple levels can be combined with W=12 or W=123'
1438         @echo  ''
1439         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1440         @echo  'For further info see the ./README file'
1441
1442
1443 help-board-dirs := $(addprefix help-,$(board-dirs))
1444
1445 help-boards: $(help-board-dirs)
1446
1447 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1448
1449 $(help-board-dirs): help-%:
1450         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1451         @$(if $(boards-per-dir), \
1452                 $(foreach b, $(boards-per-dir), \
1453                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1454                 echo '')
1455
1456
1457 # Documentation targets
1458 # ---------------------------------------------------------------------------
1459 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs linkcheckdocs
1460 PHONY += $(DOC_TARGETS)
1461 $(DOC_TARGETS): scripts_basic FORCE
1462         $(Q)$(MAKE) $(build)=Documentation $@
1463
1464 else # KBUILD_EXTMOD
1465
1466 ###
1467 # External module support.
1468 # When building external modules the kernel used as basis is considered
1469 # read-only, and no consistency checks are made and the make
1470 # system is not used on the basis kernel. If updates are required
1471 # in the basis kernel ordinary make commands (without M=...) must
1472 # be used.
1473 #
1474 # The following are the only valid targets when building external
1475 # modules.
1476 # make M=dir clean     Delete all automatically generated files
1477 # make M=dir modules   Make all modules in specified dir
1478 # make M=dir           Same as 'make M=dir modules'
1479 # make M=dir modules_install
1480 #                      Install the modules built in the module directory
1481 #                      Assumes install directory is already created
1482
1483 # We are always building modules
1484 KBUILD_MODULES := 1
1485 PHONY += crmodverdir
1486 crmodverdir:
1487         $(cmd_crmodverdir)
1488
1489 PHONY += $(objtree)/Module.symvers
1490 $(objtree)/Module.symvers:
1491         @test -e $(objtree)/Module.symvers || ( \
1492         echo; \
1493         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1494         echo "           is missing; modules will have no dependencies and modversions."; \
1495         echo )
1496
1497 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1498 PHONY += $(module-dirs) modules
1499 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1500         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1501
1502 modules: $(module-dirs)
1503         @$(kecho) '  Building modules, stage 2.';
1504         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1505
1506 PHONY += modules_install
1507 modules_install: _emodinst_ _emodinst_post
1508
1509 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1510 PHONY += _emodinst_
1511 _emodinst_:
1512         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1513         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1514
1515 PHONY += _emodinst_post
1516 _emodinst_post: _emodinst_
1517         $(call cmd,depmod)
1518
1519 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1520
1521 PHONY += $(clean-dirs) clean
1522 $(clean-dirs):
1523         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1524
1525 clean:  rm-dirs := $(MODVERDIR)
1526 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1527
1528 PHONY += help
1529 help:
1530         @echo  '  Building external modules.'
1531         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1532         @echo  ''
1533         @echo  '  modules         - default target, build the module(s)'
1534         @echo  '  modules_install - install the module'
1535         @echo  '  clean           - remove generated files in module directory only'
1536         @echo  ''
1537
1538 # Dummies...
1539 PHONY += prepare scripts
1540 prepare: ;
1541 scripts: ;
1542 endif # KBUILD_EXTMOD
1543
1544 clean: $(clean-dirs)
1545         $(call cmd,rmdirs)
1546         $(call cmd,rmfiles)
1547         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1548                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1549                 -o -name '*.ko.*' \
1550                 -o -name '*.dwo'  \
1551                 -o -name '*.su'  \
1552                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1553                 -o -name '*.symtypes' -o -name 'modules.order' \
1554                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1555                 -o -name '*.c.[012]*.*' \
1556                 -o -name '*.ll' \
1557                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1558
1559 # Generate tags for editors
1560 # ---------------------------------------------------------------------------
1561 quiet_cmd_tags = GEN     $@
1562       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1563
1564 tags TAGS cscope gtags: FORCE
1565         $(call cmd,tags)
1566
1567 # Scripts to check various things for consistency
1568 # ---------------------------------------------------------------------------
1569
1570 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1571
1572 includecheck:
1573         find $(srctree)/* $(RCS_FIND_IGNORE) \
1574                 -name '*.[hcS]' -type f -print | sort \
1575                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1576
1577 versioncheck:
1578         find $(srctree)/* $(RCS_FIND_IGNORE) \
1579                 -name '*.[hcS]' -type f -print | sort \
1580                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1581
1582 coccicheck:
1583         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1584
1585 namespacecheck:
1586         $(PERL) $(srctree)/scripts/namespace.pl
1587
1588 export_report:
1589         $(PERL) $(srctree)/scripts/export_report.pl
1590
1591 endif #ifeq ($(config-targets),1)
1592 endif #ifeq ($(mixed-targets),1)
1593
1594 PHONY += checkstack kernelrelease kernelversion image_name
1595
1596 # UML needs a little special treatment here.  It wants to use the host
1597 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1598 # else wants $(ARCH), including people doing cross-builds, which means
1599 # that $(SUBARCH) doesn't work here.
1600 ifeq ($(ARCH), um)
1601 CHECKSTACK_ARCH := $(SUBARCH)
1602 else
1603 CHECKSTACK_ARCH := $(ARCH)
1604 endif
1605 checkstack:
1606         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1607         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1608
1609 kernelrelease:
1610         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1611
1612 kernelversion:
1613         @echo $(KERNELVERSION)
1614
1615 image_name:
1616         @echo $(KBUILD_IMAGE)
1617
1618 # Clear a bunch of variables before executing the submake
1619 tools/: FORCE
1620         $(Q)mkdir -p $(objtree)/tools
1621         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1622
1623 tools/%: FORCE
1624         $(Q)mkdir -p $(objtree)/tools
1625         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1626
1627 # Single targets
1628 # ---------------------------------------------------------------------------
1629 # Single targets are compatible with:
1630 # - build with mixed source and output
1631 # - build with separate output dir 'make O=...'
1632 # - external modules
1633 #
1634 #  target-dir => where to store outputfile
1635 #  build-dir  => directory in kernel source tree to use
1636
1637 ifeq ($(KBUILD_EXTMOD),)
1638         build-dir  = $(patsubst %/,%,$(dir $@))
1639         target-dir = $(dir $@)
1640 else
1641         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1642         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1643         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1644 endif
1645
1646 %.s: %.c prepare scripts FORCE
1647         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1648 %.i: %.c prepare scripts FORCE
1649         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1650 %.o: %.c prepare scripts FORCE
1651         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1652 %.lst: %.c prepare scripts FORCE
1653         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1654 %.s: %.S prepare scripts FORCE
1655         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1656 %.o: %.S prepare scripts FORCE
1657         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1658 %.symtypes: %.c prepare scripts FORCE
1659         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1660 %.ll: %.c prepare scripts FORCE
1661         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1662
1663 # Modules
1664 /: prepare scripts FORCE
1665         $(cmd_crmodverdir)
1666         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1667         $(build)=$(build-dir)
1668 # Make sure the latest headers are built for Documentation
1669 Documentation/ samples/: headers_install
1670 %/: prepare scripts FORCE
1671         $(cmd_crmodverdir)
1672         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1673         $(build)=$(build-dir)
1674 %.ko: prepare scripts FORCE
1675         $(cmd_crmodverdir)
1676         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1677         $(build)=$(build-dir) $(@:.ko=.o)
1678         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1679
1680 # FIXME Should go into a make.lib or something
1681 # ===========================================================================
1682
1683 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1684       cmd_rmdirs = rm -rf $(rm-dirs)
1685
1686 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1687       cmd_rmfiles = rm -f $(rm-files)
1688
1689 # Run depmod only if we have System.map and depmod is executable
1690 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1691       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1692                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1693
1694 # Create temporary dir for module support files
1695 # clean it up only when building all modules
1696 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1697                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1698
1699 # read all saved command lines
1700
1701 targets := $(wildcard $(sort $(targets)))
1702 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1703
1704 ifneq ($(cmd_files),)
1705   $(cmd_files): ;       # Do not try to update included dependency files
1706   include $(cmd_files)
1707 endif
1708
1709 endif   # skip-makefile
1710
1711 PHONY += FORCE
1712 FORCE:
1713
1714 # Declare the contents of the .PHONY variable as phony.  We keep that
1715 # information in a variable so we can use it in if_changed and friends.
1716 .PHONY: $(PHONY)