Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 13
   3 SUBLEVEL = 8
   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 = $(C)
 173 endif
 174 ifndef KBUILD_CHECKSRC
 175   KBUILD_CHECKSRC = 0
 176 endif
 177
 178 # Call message checker as part of the C compilation
 179 #
 180 # Use 'make D=1' to enable checking
 181 # Use 'make D=2' to create the message catalog
 182
 183 ifdef D
 184   ifeq ("$(origin D)", "command line")
 185     KBUILD_KMSG_CHECK = $(D)
 186   endif
 187 endif
 188 ifndef KBUILD_KMSG_CHECK
 189   KBUILD_KMSG_CHECK = 0
 190 endif
 191
 192 # Use make M=dir to specify directory of external module to build
 193 # Old syntax make ... SUBDIRS=$PWD is still supported
 194 # Setting the environment variable KBUILD_EXTMOD take precedence
 195 ifdef SUBDIRS
 196   KBUILD_EXTMOD ?= $(SUBDIRS)
 197 endif
 198
 199 ifeq ("$(origin M)", "command line")
 200   KBUILD_EXTMOD := $(M)
 201 endif
 202
 203 # If building an external module we do not care about the all: rule
 204 # but instead _all depend on modules
 205 PHONY += all
 206 ifeq ($(KBUILD_EXTMOD),)
 207 _all: all
 208 else
 209 _all: modules
 210 endif
 211
 212 ifeq ($(KBUILD_SRC),)
 213         # building in the source tree
 214         srctree := .
 215 else
 216         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 217                 # building in a subdirectory of the source tree
 218                 srctree := ..
 219         else
 220                 srctree := $(KBUILD_SRC)
 221         endif
 222 endif
 223 objtree         := .
 224 src             := $(srctree)
 225 obj             := $(objtree)
 226
 227 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 228
 229 export srctree objtree VPATH
 230
 231 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 232 # first, and if a usermode build is happening, the "ARCH=um" on the command
 233 # line overrides the setting of ARCH below.  If a native build is happening,
 234 # then ARCH is assigned, getting whatever value it gets normally, and
 235 # SUBARCH is subsequently ignored.
 236
 237 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 238                                   -e s/sun4u/sparc64/ \
 239                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 240                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 241                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 242                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 243
 244 # Cross compiling and selecting different set of gcc/bin-utils
 245 # ---------------------------------------------------------------------------
 246 #
 247 # When performing cross compilation for other architectures ARCH shall be set
 248 # to the target architecture. (See arch/* for the possibilities).
 249 # ARCH can be set during invocation of make:
 250 # make ARCH=ia64
 251 # Another way is to have ARCH set in the environment.
 252 # The default ARCH is the host where make is executed.
 253
 254 # CROSS_COMPILE specify the prefix used for all executables used
 255 # during compilation. Only gcc and related bin-utils executables
 256 # are prefixed with $(CROSS_COMPILE).
 257 # CROSS_COMPILE can be set on the command line
 258 # make CROSS_COMPILE=ia64-linux-
 259 # Alternatively CROSS_COMPILE can be set in the environment.
 260 # A third alternative is to store a setting in .config so that plain
 261 # "make" in the configured kernel build directory always uses that.
 262 # Default value for CROSS_COMPILE is not to prefix executables
 263 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 264 ARCH            ?= $(SUBARCH)
 265 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 266
 267 # Architecture as present in compile.h
 268 UTS_MACHINE     := $(ARCH)
 269 SRCARCH         := $(ARCH)
 270
 271 # Additional ARCH settings for x86
 272 ifeq ($(ARCH),i386)
 273         SRCARCH := x86
 274 endif
 275 ifeq ($(ARCH),x86_64)
 276         SRCARCH := x86
 277 endif
 278
 279 # Additional ARCH settings for sparc
 280 ifeq ($(ARCH),sparc32)
 281        SRCARCH := sparc
 282 endif
 283 ifeq ($(ARCH),sparc64)
 284        SRCARCH := sparc
 285 endif
 286
 287 # Additional ARCH settings for sh
 288 ifeq ($(ARCH),sh64)
 289        SRCARCH := sh
 290 endif
 291
 292 # Additional ARCH settings for tile
 293 ifeq ($(ARCH),tilepro)
 294        SRCARCH := tile
 295 endif
 296 ifeq ($(ARCH),tilegx)
 297        SRCARCH := tile
 298 endif
 299
 300 # Where to locate arch specific headers
 301 hdr-arch  := $(SRCARCH)
 302
 303 KCONFIG_CONFIG  ?= .config
 304 export KCONFIG_CONFIG
 305
 306 # SHELL used by kbuild
 307 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 308           else if [ -x /bin/bash ]; then echo /bin/bash; \
 309           else echo sh; fi ; fi)
 310
 311 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
 312 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
 313 HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
 314
 315 HOSTCC       = gcc
 316 HOSTCXX      = g++
 317 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 318                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 319 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 320 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 321 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 322
 323 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 324 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 325                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 326 endif
 327
 328 # Decide whether to build built-in, modular, or both.
 329 # Normally, just do built-in.
 330
 331 KBUILD_MODULES :=
 332 KBUILD_BUILTIN := 1
 333
 334 # If we have only "make modules", don't compile built-in objects.
 335 # When we're building modules with modversions, we need to consider
 336 # the built-in objects during the descend as well, in order to
 337 # make sure the checksums are up to date before we record them.
 338
 339 ifeq ($(MAKECMDGOALS),modules)
 340   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 341 endif
 342
 343 # If we have "make <whatever> modules", compile modules
 344 # in addition to whatever we do anyway.
 345 # Just "make" or "make all" shall build modules as well
 346
 347 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 348   KBUILD_MODULES := 1
 349 endif
 350
 351 ifeq ($(MAKECMDGOALS),)
 352   KBUILD_MODULES := 1
 353 endif
 354
 355 export KBUILD_MODULES KBUILD_BUILTIN
 356 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 357
 358 # We need some generic definitions (do not try to remake the file).
 359 scripts/Kbuild.include: ;
 360 include scripts/Kbuild.include
 361
 362 # Make variables (CC, etc...)
 363 AS              = $(CROSS_COMPILE)as
 364 LD              = $(CROSS_COMPILE)ld
 365 CC              = $(CROSS_COMPILE)gcc
 366 CPP             = $(CC) -E
 367 AR              = $(CROSS_COMPILE)ar
 368 NM              = $(CROSS_COMPILE)nm
 369 STRIP           = $(CROSS_COMPILE)strip
 370 OBJCOPY         = $(CROSS_COMPILE)objcopy
 371 OBJDUMP         = $(CROSS_COMPILE)objdump
 372 AWK             = awk
 373 GENKSYMS        = scripts/genksyms/genksyms
 374 INSTALLKERNEL  := installkernel
 375 DEPMOD          = /sbin/depmod
 376 PERL            = perl
 377 PYTHON          = python
 378 CHECK           = sparse
 379
 380 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 381                   -Wbitwise -Wno-return-void $(CF)
 382 KMSG_CHECK      = $(srctree)/scripts/kmsg-doc
 383 NOSTDINC_FLAGS  =
 384 CFLAGS_MODULE   =
 385 AFLAGS_MODULE   =
 386 LDFLAGS_MODULE  =
 387 CFLAGS_KERNEL   =
 388 AFLAGS_KERNEL   =
 389 LDFLAGS_vmlinux =
 390 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 391 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 392
 393 # Prefer linux-backports-modules
 394 ifneq ($(KBUILD_SRC),)
 395 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
 396 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
 397 endif
 398 endif
 399
 400 # Use USERINCLUDE when you must reference the UAPI directories only.
 401 USERINCLUDE    := \
 402                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 403                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 404                 -I$(srctree)/include/uapi \
 405                 -I$(objtree)/include/generated/uapi \
 406                 -include $(srctree)/include/linux/kconfig.h
 407
 408 # Use LINUXINCLUDE when you must reference the include/ directory.
 409 # Needed to be compatible with the O= option
 410 LINUXINCLUDE    := \
 411                 $(UBUNTUINCLUDE) \
 412                 -I$(srctree)/arch/$(hdr-arch)/include \
 413                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 414                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 415                 -I$(objtree)/include \
 416                 $(USERINCLUDE)
 417
 418 # UBUNTU: Include our third party driver stuff too
 419 LINUXINCLUDE   += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
 420
 421 KBUILD_CPPFLAGS := -D__KERNEL__
 422
 423 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 424                    -fno-strict-aliasing -fno-common -fshort-wchar \
 425                    -Werror-implicit-function-declaration \
 426                    -Wno-format-security \
 427                    -std=gnu89 $(call cc-option,-fno-PIE)
 428
 429
 430 KBUILD_AFLAGS_KERNEL :=
 431 KBUILD_CFLAGS_KERNEL :=
 432 KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
 433 KBUILD_AFLAGS_MODULE  := -DMODULE
 434 KBUILD_CFLAGS_MODULE  := -DMODULE
 435 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 436
 437 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 438 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 439 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 440
 441 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 442 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 443 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 444 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 445 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 446
 447 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 448 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
 449 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 450 export KBUILD_KMSG_CHECK KMSG_CHECK
 451 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 452 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 453 export KBUILD_ARFLAGS
 454
 455 # When compiling out-of-tree modules, put MODVERDIR in the module
 456 # tree rather than in the kernel tree. The kernel tree might
 457 # even be read-only.
 458 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 459
 460 # Files to ignore in find ... statements
 461
 462 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 463                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 464                           -prune -o
 465 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 466                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 467
 468 # ===========================================================================
 469 # Rules shared between *config targets and build targets
 470
 471 # Basic helpers built in scripts/basic/
 472 PHONY += scripts_basic
 473 scripts_basic:
 474         $(Q)$(MAKE) $(build)=scripts/basic
 475         $(Q)rm -f .tmp_quiet_recordmcount
 476
 477 # To avoid any implicit rule to kick in, define an empty command.
 478 scripts/basic/%: scripts_basic ;
 479
 480 PHONY += outputmakefile
 481 # outputmakefile generates a Makefile in the output directory, if using a
 482 # separate output directory. This allows convenient use of make in the
 483 # output directory.
 484 outputmakefile:
 485 ifneq ($(KBUILD_SRC),)
 486         $(Q)ln -fsn $(srctree) source
 487         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 488             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 489 endif
 490
 491 # Support for using generic headers in asm-generic
 492 PHONY += asm-generic uapi-asm-generic
 493 asm-generic: uapi-asm-generic
 494         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 495                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 496 uapi-asm-generic:
 497         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 498                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 499
 500 # To make sure we do not include .config for any of the *config targets
 501 # catch them early, and hand them over to scripts/kconfig/Makefile
 502 # It is allowed to specify more targets when calling make, including
 503 # mixing *config targets and build targets.
 504 # For example 'make oldconfig all'.
 505 # Detect when mixed targets is specified, and make a second invocation
 506 # of make so .config is not included in this case either (for *config).
 507
 508 version_h := include/generated/uapi/linux/version.h
 509 old_version_h := include/linux/version.h
 510
 511 no-dot-config-targets := clean mrproper distclean \
 512                          cscope gtags TAGS tags help% %docs check% coccicheck \
 513                          $(version_h) headers_% archheaders archscripts \
 514                          kernelversion %src-pkg
 515
 516 config-targets := 0
 517 mixed-targets  := 0
 518 dot-config     := 1
 519
 520 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 521         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 522                 dot-config := 0
 523         endif
 524 endif
 525
 526 ifeq ($(KBUILD_EXTMOD),)
 527         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 528                 config-targets := 1
 529                 ifneq ($(words $(MAKECMDGOALS)),1)
 530                         mixed-targets := 1
 531                 endif
 532         endif
 533 endif
 534 # install and modules_install need also be processed one by one
 535 ifneq ($(filter install,$(MAKECMDGOALS)),)
 536         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 537                 mixed-targets := 1
 538         endif
 539 endif
 540
 541 ifeq ($(mixed-targets),1)
 542 # ===========================================================================
 543 # We're called with mixed targets (*config and build targets).
 544 # Handle them one by one.
 545
 546 PHONY += $(MAKECMDGOALS) __build_one_by_one
 547
 548 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 549         @:
 550
 551 __build_one_by_one:
 552         $(Q)set -e; \
 553         for i in $(MAKECMDGOALS); do \
 554                 $(MAKE) -f $(srctree)/Makefile $$i; \
 555         done
 556
 557 else
 558 ifeq ($(config-targets),1)
 559 # ===========================================================================
 560 # *config targets only - make sure prerequisites are updated, and descend
 561 # in scripts/kconfig to make the *config target
 562
 563 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 564 # KBUILD_DEFCONFIG may point out an alternative default configuration
 565 # used for 'make defconfig'
 566 include arch/$(SRCARCH)/Makefile
 567 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 568
 569 config: scripts_basic outputmakefile FORCE
 570         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 571
 572 %config: scripts_basic outputmakefile FORCE
 573         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 574
 575 else
 576 # ===========================================================================
 577 # Build targets only - this includes vmlinux, arch specific targets, clean
 578 # targets and others. In general all targets except *config targets.
 579
 580 ifeq ($(KBUILD_EXTMOD),)
 581 # Additional helpers built in scripts/
 582 # Carefully list dependencies so we do not try to build scripts twice
 583 # in parallel
 584 PHONY += scripts
 585 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 586          asm-generic gcc-plugins
 587         $(Q)$(MAKE) $(build)=$(@)
 588
 589 # Objects we will link into vmlinux / subdirs we need to visit
 590 init-y          := init/
 591 drivers-y       := drivers/ sound/ firmware/ ubuntu/
 592 net-y           := net/
 593 libs-y          := lib/
 594 core-y          := usr/
 595 virt-y          := virt/
 596 endif # KBUILD_EXTMOD
 597
 598 ifeq ($(dot-config),1)
 599 # Read in config
 600 -include include/config/auto.conf
 601
 602 ifeq ($(KBUILD_EXTMOD),)
 603 # Read in dependencies to all Kconfig* files, make sure to run
 604 # oldconfig if changes are detected.
 605 -include include/config/auto.conf.cmd
 606
 607 # To avoid any implicit rule to kick in, define an empty command
 608 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 609
 610 # If .config is newer than include/config/auto.conf, someone tinkered
 611 # with it and forgot to run make oldconfig.
 612 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 613 # we execute the config step to be sure to catch updated Kconfig files
 614 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 615         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 616 else
 617 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 618 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 619 PHONY += include/config/auto.conf
 620
 621 include/config/auto.conf:
 622         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 623         echo >&2;                                                       \
 624         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 625         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 626         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 627         echo >&2 ;                                                      \
 628         /bin/false)
 629
 630 endif # KBUILD_EXTMOD
 631
 632 else
 633 # Dummy target needed, because used as prerequisite
 634 include/config/auto.conf: ;
 635 endif # $(dot-config)
 636
 637 # For the kernel to actually contain only the needed exported symbols,
 638 # we have to build modules as well to determine what those symbols are.
 639 # (this can be evaluated only once include/config/auto.conf has been included)
 640 ifdef CONFIG_TRIM_UNUSED_KSYMS
 641   KBUILD_MODULES := 1
 642 endif
 643
 644 # The all: target is the default when no target is given on the
 645 # command line.
 646 # This allow a user to issue only 'make' to build a kernel including modules
 647 # Defaults to vmlinux, but the arch makefile usually adds further targets
 648 all: vmlinux
 649
 650 # force no-pie for distro compilers that enable pie by default
 651 KBUILD_CFLAGS += $(call cc-option, -fno-pie)
 652 KBUILD_CFLAGS += $(call cc-option, -no-pie)
 653 KBUILD_AFLAGS += $(call cc-option, -fno-pie)
 654 KBUILD_CPPFLAGS += $(call cc-option, -fno-pie)
 655
 656 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 657 # values of the respective KBUILD_* variables
 658 ARCH_CPPFLAGS :=
 659 ARCH_AFLAGS :=
 660 ARCH_CFLAGS :=
 661 include arch/$(SRCARCH)/Makefile
 662
 663 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 664 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 665 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 666 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 667 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 668
 669 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 670 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 671 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 672 else
 673 ifdef CONFIG_PROFILE_ALL_BRANCHES
 674 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 675 else
 676 KBUILD_CFLAGS   += -O2
 677 endif
 678 endif
 679
 680 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 681                         $(call cc-disable-warning,maybe-uninitialized,))
 682
 683 # Tell gcc to never replace conditional load with a non-conditional one
 684 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 685
 686 # check for 'asm goto'
 687 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 688         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 689         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 690 endif
 691
 692 include scripts/Makefile.gcc-plugins
 693
 694 ifdef CONFIG_READABLE_ASM
 695 # Disable optimizations that make assembler listings hard to read.
 696 # reorder blocks reorders the control in the function
 697 # ipa clone creates specialized cloned functions
 698 # partial inlining inlines only parts of functions
 699 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 700                  $(call cc-option,-fno-ipa-cp-clone,) \
 701                  $(call cc-option,-fno-partial-inlining)
 702 endif
 703
 704 ifneq ($(CONFIG_FRAME_WARN),0)
 705 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 706 endif
 707
 708 # This selects the stack protector compiler flag. Testing it is delayed
 709 # until after .config has been reprocessed, in the prepare-compiler-check
 710 # target.
 711 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 712   stackp-flag := -fstack-protector
 713   stackp-name := REGULAR
 714 else
 715 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 716   stackp-flag := -fstack-protector-strong
 717   stackp-name := STRONG
 718 else
 719   # Force off for distro compilers that enable stack protector by default.
 720   stackp-flag := $(call cc-option, -fno-stack-protector)
 721 endif
 722 endif
 723 # Find arch-specific stack protector compiler sanity-checking script.
 724 ifdef CONFIG_CC_STACKPROTECTOR
 725   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 726   stackp-check := $(wildcard $(stackp-path))
 727 endif
 728 KBUILD_CFLAGS += $(stackp-flag)
 729
 730 ifeq ($(cc-name),clang)
 731 ifneq ($(CROSS_COMPILE),)
 732 CLANG_TARGET    := -target $(notdir $(CROSS_COMPILE:%-=%))
 733 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 734 endif
 735 ifneq ($(GCC_TOOLCHAIN),)
 736 CLANG_GCC_TC    := -gcc-toolchain $(GCC_TOOLCHAIN)
 737 endif
 738 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 739 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 740 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 741 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 742 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 743 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 744 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 745 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 746 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 747 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 748 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 749 # See modpost pattern 2
 750 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 751 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 752 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 753 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 754 else
 755
 756 # These warnings generated too much noise in a regular build.
 757 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 758 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 759 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 760 endif
 761
 762 ifdef CONFIG_FRAME_POINTER
 763 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 764 else
 765 # Some targets (ARM with Thumb2, for example), can't be built with frame
 766 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 767 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 768 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 769 # -fomit-frame-pointer with FUNCTION_TRACER.
 770 ifndef CONFIG_FUNCTION_TRACER
 771 KBUILD_CFLAGS   += -fomit-frame-pointer
 772 endif
 773 endif
 774
 775 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 776
 777 ifdef CONFIG_DEBUG_INFO
 778 ifdef CONFIG_DEBUG_INFO_SPLIT
 779 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 780 else
 781 KBUILD_CFLAGS   += -g
 782 endif
 783 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 784 endif
 785 ifdef CONFIG_DEBUG_INFO_DWARF4
 786 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 787 endif
 788
 789 ifdef CONFIG_DEBUG_INFO_REDUCED
 790 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 791                    $(call cc-option,-fno-var-tracking)
 792 endif
 793
 794 ifdef CONFIG_FUNCTION_TRACER
 795 ifndef CC_FLAGS_FTRACE
 796 CC_FLAGS_FTRACE := -pg
 797 endif
 798 export CC_FLAGS_FTRACE
 799 ifdef CONFIG_HAVE_FENTRY
 800 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 801 endif
 802 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 803 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 804 ifdef CONFIG_DYNAMIC_FTRACE
 805         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 806                 BUILD_C_RECORDMCOUNT := y
 807                 export BUILD_C_RECORDMCOUNT
 808         endif
 809 endif
 810 endif
 811
 812 # We trigger additional mismatches with less inlining
 813 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 814 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 815 endif
 816
 817 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 818 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 819 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 820 endif
 821
 822 # arch Makefile may override CC so keep this after arch Makefile is included
 823 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 824 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 825
 826 # warn about C99 declaration after statement
 827 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 828
 829 # disable pointer signed / unsigned warnings in gcc 4.0
 830 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 831
 832 # disable invalid "can't wrap" optimizations for signed / pointers
 833 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 834
 835 # conserve stack if available
 836 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 837
 838 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 839 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 840
 841 # require functions to have arguments in prototypes, not empty 'int foo()'
 842 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 843
 844 # Prohibit date/time macros, which would make the build non-deterministic
 845 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 846
 847 # enforce correct pointer usage
 848 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 849
 850 # Require designated initializers for all marked structures
 851 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 852
 853 # use the deterministic mode of AR if available
 854 KBUILD_ARFLAGS := $(call ar-option,D)
 855
 856 include scripts/Makefile.kasan
 857 include scripts/Makefile.extrawarn
 858 include scripts/Makefile.ubsan
 859
 860 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 861 # last assignments
 862 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 863 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 864 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 865
 866 # Use --build-id when available.
 867 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 868                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 869 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 870 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 871
 872 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 873 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 874 endif
 875
 876 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 877 LDFLAGS_vmlinux += $(call ld-option, -X,)
 878 endif
 879
 880 # Default kernel image to build when no specific target is given.
 881 # KBUILD_IMAGE may be overruled on the command line or
 882 # set in the environment
 883 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 884 # this default value
 885 export KBUILD_IMAGE ?= vmlinux
 886
 887 #
 888 # INSTALL_PATH specifies where to place the updated kernel and system map
 889 # images. Default is /boot, but you can set it to other values
 890 export  INSTALL_PATH ?= /boot
 891
 892 #
 893 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 894 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 895 # an argument if needed. Otherwise it defaults to the kernel install path
 896 #
 897 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 898
 899 #
 900 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 901 # relocations required by build roots.  This is not defined in the
 902 # makefile but the argument can be passed to make if needed.
 903 #
 904
 905 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 906 export MODLIB
 907
 908 #
 909 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 910 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 911 # the default option --strip-debug will be used.  Otherwise,
 912 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 913
 914 ifdef INSTALL_MOD_STRIP
 915 ifeq ($(INSTALL_MOD_STRIP),1)
 916 mod_strip_cmd = $(STRIP) --strip-debug
 917 else
 918 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 919 endif # INSTALL_MOD_STRIP=1
 920 else
 921 mod_strip_cmd = true
 922 endif # INSTALL_MOD_STRIP
 923 export mod_strip_cmd
 924
 925 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 926 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 927 # or CONFIG_MODULE_COMPRESS_XZ.
 928
 929 mod_compress_cmd = true
 930 ifdef CONFIG_MODULE_COMPRESS
 931   ifdef CONFIG_MODULE_COMPRESS_GZIP
 932     mod_compress_cmd = gzip -n -f
 933   endif # CONFIG_MODULE_COMPRESS_GZIP
 934   ifdef CONFIG_MODULE_COMPRESS_XZ
 935     mod_compress_cmd = xz -f
 936   endif # CONFIG_MODULE_COMPRESS_XZ
 937 endif # CONFIG_MODULE_COMPRESS
 938 export mod_compress_cmd
 939
 940 # Select initial ramdisk compression format, default is gzip(1).
 941 # This shall be used by the dracut(8) tool while creating an initramfs image.
 942 #
 943 INITRD_COMPRESS-y                  := gzip
 944 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 945 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 946 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 947 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 948 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 949 # do not export INITRD_COMPRESS, since we didn't actually
 950 # choose a sane default compression above.
 951 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 952
 953 ifdef CONFIG_MODULE_SIG_ALL
 954 $(eval $(call config_filename,MODULE_SIG_KEY))
 955
 956 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 957 else
 958 mod_sign_cmd = true
 959 endif
 960 export mod_sign_cmd
 961
 962 ifdef CONFIG_STACK_VALIDATION
 963   has_libelf := $(call try-run,\
 964                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 965   ifeq ($(has_libelf),1)
 966     objtool_target := tools/objtool FORCE
 967   else
 968     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 969     SKIP_STACK_VALIDATION := 1
 970     export SKIP_STACK_VALIDATION
 971   endif
 972 endif
 973
 974
 975 ifeq ($(KBUILD_EXTMOD),)
 976 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 977
 978 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 979                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 980                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 981
 982 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 983                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 984
 985 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 986 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 987 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 988 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 989 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 990 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
 991 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 992
 993 # Externally visible symbols (used by link-vmlinux.sh)
 994 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 995 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 996 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 997 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 998 export LDFLAGS_vmlinux
 999 # used by scripts/package/Makefile
1000 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1001
1002 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1003
1004 # Include targets which we want to execute sequentially if the rest of the
1005 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1006 # evaluated more than once.
1007 PHONY += vmlinux_prereq
1008 vmlinux_prereq: $(vmlinux-deps) FORCE
1009 ifdef CONFIG_HEADERS_CHECK
1010         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1011 endif
1012 ifdef CONFIG_GDB_SCRIPTS
1013         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
1014 endif
1015 ifdef CONFIG_TRIM_UNUSED_KSYMS
1016         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1017           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1018 endif
1019
1020 # standalone target for easier testing
1021 include/generated/autoksyms.h: FORCE
1022         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1023
1024 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1025
1026 # Final link of vmlinux with optional arch pass after final link
1027 cmd_link-vmlinux =                                                 \
1028         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1029         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1030
1031 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1032         +$(call if_changed,link-vmlinux)
1033
1034 # Build samples along the rest of the kernel
1035 ifdef CONFIG_SAMPLES
1036 vmlinux-dirs += samples
1037 endif
1038
1039 # The actual objects are generated when descending,
1040 # make sure no implicit rule kicks in
1041 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1042
1043 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1044 # Preset locale variables to speed up the build process. Limit locale
1045 # tweaks to this spot to avoid wrong language settings when running
1046 # make menuconfig etc.
1047 # Error messages still appears in the original language
1048
1049 PHONY += $(vmlinux-dirs)
1050 $(vmlinux-dirs): prepare scripts
1051         $(Q)$(MAKE) $(build)=$@
1052
1053 define filechk_kernel.release
1054         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1055 endef
1056
1057 # Store (new) KERNELRELEASE string in include/config/kernel.release
1058 include/config/kernel.release: include/config/auto.conf FORCE
1059         $(call filechk,kernel.release)
1060
1061
1062 # Things we need to do before we recursively start building the kernel
1063 # or the modules are listed in "prepare".
1064 # A multi level approach is used. prepareN is processed before prepareN-1.
1065 # archprepare is used in arch Makefiles and when processed asm symlink,
1066 # version.h and scripts_basic is processed / created.
1067
1068 # Listed in dependency order
1069 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1070
1071 # prepare3 is used to check if we are building in a separate output directory,
1072 # and if so do:
1073 # 1) Check that make has not been executed in the kernel src $(srctree)
1074 prepare3: include/config/kernel.release
1075 ifneq ($(KBUILD_SRC),)
1076         @$(kecho) '  Using $(srctree) as source for kernel'
1077         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1078                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1079                 echo >&2 "  in the '$(srctree)' directory.";\
1080                 /bin/false; \
1081         fi;
1082 endif
1083
1084 # prepare2 creates a makefile if using a separate output directory.
1085 # From this point forward, .config has been reprocessed, so any rules
1086 # that need to depend on updated CONFIG_* values can be checked here.
1087 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1088
1089 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1090                    include/config/auto.conf
1091         $(cmd_crmodverdir)
1092
1093 archprepare: archheaders archscripts prepare1 scripts_basic
1094
1095 prepare0: archprepare gcc-plugins
1096         $(Q)$(MAKE) $(build)=.
1097
1098 # All the preparing..
1099 prepare: prepare0 prepare-objtool
1100
1101 PHONY += prepare-objtool
1102 prepare-objtool: $(objtool_target)
1103
1104 # Check for CONFIG flags that require compiler support. Abort the build
1105 # after .config has been processed, but before the kernel build starts.
1106 #
1107 # For security-sensitive CONFIG options, we don't want to fallback and/or
1108 # silently change which compiler flags will be used, since that leads to
1109 # producing kernels with different security feature characteristics
1110 # depending on the compiler used. (For example, "But I selected
1111 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1112 PHONY += prepare-compiler-check
1113 prepare-compiler-check: FORCE
1114 # Make sure compiler supports requested stack protector flag.
1115 ifdef stackp-name
1116   ifeq ($(call cc-option, $(stackp-flag)),)
1117         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1118                   $(stackp-flag) not supported by compiler >&2 && exit 1
1119   endif
1120 endif
1121 # Make sure compiler does not have buggy stack-protector support.
1122 ifdef stackp-check
1123   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1124         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1125                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1126   endif
1127 endif
1128         @:
1129
1130 # Generate some files
1131 # ---------------------------------------------------------------------------
1132
1133 # KERNELRELEASE can change from a few different places, meaning version.h
1134 # needs to be updated, so this check is forced on all builds
1135
1136 uts_len := 64
1137 define filechk_utsrelease.h
1138         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1139           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1140           exit 1;                                                         \
1141         fi;                                                               \
1142         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1143 endef
1144
1145 define filechk_version.h
1146         (echo \#define LINUX_VERSION_CODE $(shell                         \
1147         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1148         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1149 endef
1150
1151 $(version_h): $(srctree)/Makefile FORCE
1152         $(call filechk,version.h)
1153         $(Q)rm -f $(old_version_h)
1154
1155 include/generated/utsrelease.h: include/config/kernel.release FORCE
1156         $(call filechk,utsrelease.h)
1157
1158 PHONY += headerdep
1159 headerdep:
1160         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1161         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1162
1163 # ---------------------------------------------------------------------------
1164 # Firmware install
1165 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1166 export INSTALL_FW_PATH
1167
1168 PHONY += firmware_install
1169 firmware_install:
1170         @mkdir -p $(objtree)/firmware
1171         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1172
1173 # ---------------------------------------------------------------------------
1174 # Kernel headers
1175
1176 #Default location for installed headers
1177 export INSTALL_HDR_PATH = $(objtree)/usr
1178
1179 # If we do an all arch process set dst to include/arch-$(hdr-arch)
1180 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
1181
1182 PHONY += archheaders
1183 archheaders:
1184
1185 PHONY += archscripts
1186 archscripts:
1187
1188 PHONY += __headers
1189 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1190         $(Q)$(MAKE) $(build)=scripts build_unifdef
1191
1192 PHONY += headers_install_all
1193 headers_install_all:
1194         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1195
1196 PHONY += headers_install
1197 headers_install: __headers
1198         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1199           $(error Headers not exportable for the $(SRCARCH) architecture))
1200         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1201         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
1202         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1203
1204 PHONY += headers_check_all
1205 headers_check_all: headers_install_all
1206         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1207
1208 PHONY += headers_check
1209 headers_check: headers_install
1210         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1211         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
1212         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1213
1214 # ---------------------------------------------------------------------------
1215 # Kernel selftest
1216
1217 PHONY += kselftest
1218 kselftest:
1219         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1220
1221 PHONY += kselftest-clean
1222 kselftest-clean:
1223         $(Q)$(MAKE) -C tools/testing/selftests clean
1224
1225 PHONY += kselftest-merge
1226 kselftest-merge:
1227         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1228         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1229                 -m $(objtree)/.config \
1230                 $(srctree)/tools/testing/selftests/*/config
1231         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1232
1233 # ---------------------------------------------------------------------------
1234 # Modules
1235
1236 ifdef CONFIG_MODULES
1237
1238 # By default, build modules as well
1239
1240 all: modules
1241
1242 # Build modules
1243 #
1244 # A module can be listed more than once in obj-m resulting in
1245 # duplicate lines in modules.order files.  Those are removed
1246 # using awk while concatenating to the final file.
1247
1248 PHONY += modules
1249 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1250         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1251         @$(kecho) '  Building modules, stage 2.';
1252         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1253         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1254
1255 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1256         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1257
1258 %/modules.builtin: include/config/auto.conf
1259         $(Q)$(MAKE) $(modbuiltin)=$*
1260
1261
1262 # Target to prepare building external modules
1263 PHONY += modules_prepare
1264 modules_prepare: prepare scripts
1265
1266 # Target to install modules
1267 PHONY += modules_install
1268 modules_install: _modinst_ _modinst_post
1269
1270 PHONY += _modinst_
1271 _modinst_:
1272         @rm -rf $(MODLIB)/kernel
1273         @rm -f $(MODLIB)/source
1274         @mkdir -p $(MODLIB)/kernel
1275         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1276         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1277                 rm -f $(MODLIB)/build ; \
1278                 ln -s $(CURDIR) $(MODLIB)/build ; \
1279         fi
1280         @cp -f $(objtree)/modules.order $(MODLIB)/
1281         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1282         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1283
1284 # This depmod is only for convenience to give the initial
1285 # boot a modules.dep even before / is mounted read-write.  However the
1286 # boot script depmod is the master version.
1287 PHONY += _modinst_post
1288 _modinst_post: _modinst_
1289         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1290         $(call cmd,depmod)
1291
1292 ifeq ($(CONFIG_MODULE_SIG), y)
1293 PHONY += modules_sign
1294 modules_sign:
1295         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1296 endif
1297
1298 else # CONFIG_MODULES
1299
1300 # Modules not configured
1301 # ---------------------------------------------------------------------------
1302
1303 PHONY += modules modules_install
1304 modules modules_install:
1305         @echo >&2
1306         @echo >&2 "The present kernel configuration has modules disabled."
1307         @echo >&2 "Type 'make config' and enable loadable module support."
1308         @echo >&2 "Then build a kernel with module support enabled."
1309         @echo >&2
1310         @exit 1
1311
1312 endif # CONFIG_MODULES
1313
1314 ###
1315 # Cleaning is done on three levels.
1316 # make clean     Delete most generated files
1317 #                Leave enough to build external modules
1318 # make mrproper  Delete the current configuration, and all generated files
1319 # make distclean Remove editor backup files, patch leftover files and the like
1320
1321 # Directories & files removed with 'make clean'
1322 CLEAN_DIRS  += $(MODVERDIR)
1323
1324 # Directories & files removed with 'make mrproper'
1325 MRPROPER_DIRS  += include/config usr/include include/generated          \
1326                   arch/*/include/generated .tmp_objdiff
1327 MRPROPER_FILES += .config .config.old .version .old_version \
1328                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1329                   signing_key.pem signing_key.priv signing_key.x509     \
1330                   x509.genkey extra_certificates signing_key.x509.keyid \
1331                   signing_key.x509.signer vmlinux-gdb.py
1332
1333 # clean - Delete most, but leave enough to build external modules
1334 #
1335 clean: rm-dirs  := $(CLEAN_DIRS)
1336 clean: rm-files := $(CLEAN_FILES)
1337 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1338
1339 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1340 $(clean-dirs):
1341         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1342
1343 vmlinuxclean:
1344         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1345         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1346
1347 clean: archclean vmlinuxclean
1348
1349 # mrproper - Delete all generated files, including .config
1350 #
1351 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1352 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1353 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1354
1355 PHONY += $(mrproper-dirs) mrproper archmrproper
1356 $(mrproper-dirs):
1357         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1358
1359 mrproper: clean archmrproper $(mrproper-dirs)
1360         $(call cmd,rmdirs)
1361         $(call cmd,rmfiles)
1362
1363 # distclean
1364 #
1365 PHONY += distclean
1366
1367 distclean: mrproper
1368         @find $(srctree) $(RCS_FIND_IGNORE) \
1369                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1370                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1371                 -o -name 'core' \) \
1372                 -type f -print | xargs rm -f
1373
1374
1375 # Packaging of the kernel to various formats
1376 # ---------------------------------------------------------------------------
1377 # rpm target kept for backward compatibility
1378 package-dir     := scripts/package
1379
1380 %src-pkg: FORCE
1381         $(Q)$(MAKE) $(build)=$(package-dir) $@
1382 %pkg: include/config/kernel.release FORCE
1383         $(Q)$(MAKE) $(build)=$(package-dir) $@
1384 rpm: include/config/kernel.release FORCE
1385         $(Q)$(MAKE) $(build)=$(package-dir) $@
1386
1387
1388 # Brief documentation of the typical targets used
1389 # ---------------------------------------------------------------------------
1390
1391 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1392 boards := $(sort $(notdir $(boards)))
1393 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1394 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1395
1396 PHONY += help
1397 help:
1398         @echo  'Cleaning targets:'
1399         @echo  '  clean           - Remove most generated files but keep the config and'
1400         @echo  '                    enough build support to build external modules'
1401         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1402         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1403         @echo  ''
1404         @echo  'Configuration targets:'
1405         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1406         @echo  ''
1407         @echo  'Other generic targets:'
1408         @echo  '  all             - Build all targets marked with [*]'
1409         @echo  '* vmlinux         - Build the bare kernel'
1410         @echo  '* modules         - Build all modules'
1411         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1412         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1413         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1414         @echo  '  dir/            - Build all files in dir and below'
1415         @echo  '  dir/file.[ois]  - Build specified target only'
1416         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1417         @echo  '                    (requires compiler support for LLVM assembly generation)'
1418         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1419         @echo  '                    (requires a recent binutils and recent build (System.map))'
1420         @echo  '  dir/file.ko     - Build module including final link'
1421         @echo  '  modules_prepare - Set up for building external modules'
1422         @echo  '  tags/TAGS       - Generate tags file for editors'
1423         @echo  '  cscope          - Generate cscope index'
1424         @echo  '  gtags           - Generate GNU GLOBAL index'
1425         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1426         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1427         @echo  '  image_name      - Output the image name (use with make -s)'
1428         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1429          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1430          echo  ''
1431         @echo  'Static analysers:'
1432         @echo  '  checkstack      - Generate a list of stack hogs'
1433         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1434         @echo  '  versioncheck    - Sanity check on version.h usage'
1435         @echo  '  includecheck    - Check for duplicate included header files'
1436         @echo  '  export_report   - List the usages of all exported symbols'
1437         @echo  '  headers_check   - Sanity check on exported headers'
1438         @echo  '  headerdep       - Detect inclusion cycles in headers'
1439         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1440         @echo  ''
1441         @echo  'Kernel selftest:'
1442         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1443         @echo  '                    Build, install, and boot kernel before'
1444         @echo  '                    running kselftest on it'
1445         @echo  '  kselftest-clean - Remove all generated kselftest files'
1446         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1447         @echo  '                    .config.'
1448         @echo  ''
1449         @echo 'Userspace tools targets:'
1450         @echo '  use "make tools/help"'
1451         @echo '  or  "cd tools; make help"'
1452         @echo  ''
1453         @echo  'Kernel packaging:'
1454         @$(MAKE) $(build)=$(package-dir) help
1455         @echo  ''
1456         @echo  'Documentation targets:'
1457         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1458         @echo  ''
1459         @echo  'Architecture specific targets ($(SRCARCH)):'
1460         @$(if $(archhelp),$(archhelp),\
1461                 echo '  No architecture specific help defined for $(SRCARCH)')
1462         @echo  ''
1463         @$(if $(boards), \
1464                 $(foreach b, $(boards), \
1465                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1466                 echo '')
1467         @$(if $(board-dirs), \
1468                 $(foreach b, $(board-dirs), \
1469                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1470                 printf "  %-16s - Show all of the above\\n" help-boards; \
1471                 echo '')
1472
1473         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1474         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1475         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1476         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1477         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1478         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1479         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1480         @echo  '                1: warnings which may be relevant and do not occur too often'
1481         @echo  '                2: warnings which occur quite often but may still be relevant'
1482         @echo  '                3: more obscure warnings, can most likely be ignored'
1483         @echo  '                Multiple levels can be combined with W=12 or W=123'
1484         @echo  ''
1485         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1486         @echo  'For further info see the ./README file'
1487
1488
1489 help-board-dirs := $(addprefix help-,$(board-dirs))
1490
1491 help-boards: $(help-board-dirs)
1492
1493 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1494
1495 $(help-board-dirs): help-%:
1496         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1497         @$(if $(boards-per-dir), \
1498                 $(foreach b, $(boards-per-dir), \
1499                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1500                 echo '')
1501
1502
1503 # Documentation targets
1504 # ---------------------------------------------------------------------------
1505 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs linkcheckdocs
1506 PHONY += $(DOC_TARGETS)
1507 $(DOC_TARGETS): scripts_basic FORCE
1508         $(Q)$(MAKE) $(build)=Documentation $@
1509
1510 else # KBUILD_EXTMOD
1511
1512 ###
1513 # External module support.
1514 # When building external modules the kernel used as basis is considered
1515 # read-only, and no consistency checks are made and the make
1516 # system is not used on the basis kernel. If updates are required
1517 # in the basis kernel ordinary make commands (without M=...) must
1518 # be used.
1519 #
1520 # The following are the only valid targets when building external
1521 # modules.
1522 # make M=dir clean     Delete all automatically generated files
1523 # make M=dir modules   Make all modules in specified dir
1524 # make M=dir           Same as 'make M=dir modules'
1525 # make M=dir modules_install
1526 #                      Install the modules built in the module directory
1527 #                      Assumes install directory is already created
1528
1529 # We are always building modules
1530 KBUILD_MODULES := 1
1531 PHONY += crmodverdir
1532 crmodverdir:
1533         $(cmd_crmodverdir)
1534
1535 PHONY += $(objtree)/Module.symvers
1536 $(objtree)/Module.symvers:
1537         @test -e $(objtree)/Module.symvers || ( \
1538         echo; \
1539         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1540         echo "           is missing; modules will have no dependencies and modversions."; \
1541         echo )
1542
1543 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1544 PHONY += $(module-dirs) modules
1545 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1546         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1547
1548 modules: $(module-dirs)
1549         @$(kecho) '  Building modules, stage 2.';
1550         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1551
1552 PHONY += modules_install
1553 modules_install: _emodinst_ _emodinst_post
1554
1555 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1556 PHONY += _emodinst_
1557 _emodinst_:
1558         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1559         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1560
1561 PHONY += _emodinst_post
1562 _emodinst_post: _emodinst_
1563         $(call cmd,depmod)
1564
1565 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1566
1567 PHONY += $(clean-dirs) clean
1568 $(clean-dirs):
1569         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1570
1571 clean:  rm-dirs := $(MODVERDIR)
1572 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1573
1574 PHONY += help
1575 help:
1576         @echo  '  Building external modules.'
1577         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1578         @echo  ''
1579         @echo  '  modules         - default target, build the module(s)'
1580         @echo  '  modules_install - install the module'
1581         @echo  '  clean           - remove generated files in module directory only'
1582         @echo  ''
1583
1584 # Dummies...
1585 PHONY += prepare scripts
1586 prepare: ;
1587 scripts: ;
1588 endif # KBUILD_EXTMOD
1589
1590 clean: $(clean-dirs)
1591         $(call cmd,rmdirs)
1592         $(call cmd,rmfiles)
1593         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1594                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1595                 -o -name '*.ko.*' \
1596                 -o -name '*.dwo'  \
1597                 -o -name '*.su'  \
1598                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1599                 -o -name '*.symtypes' -o -name 'modules.order' \
1600                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1601                 -o -name '*.c.[012]*.*' \
1602                 -o -name '*.ll' \
1603                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1604
1605 # Generate tags for editors
1606 # ---------------------------------------------------------------------------
1607 quiet_cmd_tags = GEN     $@
1608       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1609
1610 tags TAGS cscope gtags: FORCE
1611         $(call cmd,tags)
1612
1613 # Scripts to check various things for consistency
1614 # ---------------------------------------------------------------------------
1615
1616 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1617
1618 includecheck:
1619         find $(srctree)/* $(RCS_FIND_IGNORE) \
1620                 -name '*.[hcS]' -type f -print | sort \
1621                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1622
1623 versioncheck:
1624         find $(srctree)/* $(RCS_FIND_IGNORE) \
1625                 -name '*.[hcS]' -type f -print | sort \
1626                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1627
1628 coccicheck:
1629         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1630
1631 namespacecheck:
1632         $(PERL) $(srctree)/scripts/namespace.pl
1633
1634 export_report:
1635         $(PERL) $(srctree)/scripts/export_report.pl
1636
1637 endif #ifeq ($(config-targets),1)
1638 endif #ifeq ($(mixed-targets),1)
1639
1640 PHONY += checkstack kernelrelease kernelversion image_name
1641
1642 # UML needs a little special treatment here.  It wants to use the host
1643 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1644 # else wants $(ARCH), including people doing cross-builds, which means
1645 # that $(SUBARCH) doesn't work here.
1646 ifeq ($(ARCH), um)
1647 CHECKSTACK_ARCH := $(SUBARCH)
1648 else
1649 CHECKSTACK_ARCH := $(ARCH)
1650 endif
1651 checkstack:
1652         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1653         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1654
1655 kernelrelease:
1656         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1657
1658 kernelversion:
1659         @echo $(KERNELVERSION)
1660
1661 image_name:
1662         @echo $(KBUILD_IMAGE)
1663
1664 # Clear a bunch of variables before executing the submake
1665 tools/: FORCE
1666         $(Q)mkdir -p $(objtree)/tools
1667         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1668
1669 tools/%: FORCE
1670         $(Q)mkdir -p $(objtree)/tools
1671         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1672
1673 # Single targets
1674 # ---------------------------------------------------------------------------
1675 # Single targets are compatible with:
1676 # - build with mixed source and output
1677 # - build with separate output dir 'make O=...'
1678 # - external modules
1679 #
1680 #  target-dir => where to store outputfile
1681 #  build-dir  => directory in kernel source tree to use
1682
1683 ifeq ($(KBUILD_EXTMOD),)
1684         build-dir  = $(patsubst %/,%,$(dir $@))
1685         target-dir = $(dir $@)
1686 else
1687         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1688         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1689         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1690 endif
1691
1692 %.s: %.c prepare scripts FORCE
1693         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1694 %.i: %.c prepare scripts FORCE
1695         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1696 %.o: %.c prepare scripts FORCE
1697         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1698 %.lst: %.c prepare scripts FORCE
1699         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1700 %.s: %.S prepare scripts FORCE
1701         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1702 %.o: %.S prepare scripts FORCE
1703         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1704 %.symtypes: %.c prepare scripts FORCE
1705         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1706 %.ll: %.c prepare scripts FORCE
1707         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1708
1709 # Modules
1710 /: prepare scripts FORCE
1711         $(cmd_crmodverdir)
1712         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1713         $(build)=$(build-dir)
1714 # Make sure the latest headers are built for Documentation
1715 Documentation/ samples/: headers_install
1716 %/: prepare scripts FORCE
1717         $(cmd_crmodverdir)
1718         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1719         $(build)=$(build-dir)
1720 %.ko: prepare scripts FORCE
1721         $(cmd_crmodverdir)
1722         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1723         $(build)=$(build-dir) $(@:.ko=.o)
1724         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1725
1726 # FIXME Should go into a make.lib or something
1727 # ===========================================================================
1728
1729 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1730       cmd_rmdirs = rm -rf $(rm-dirs)
1731
1732 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1733       cmd_rmfiles = rm -f $(rm-files)
1734
1735 # Run depmod only if we have System.map and depmod is executable
1736 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1737       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1738                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1739
1740 # Create temporary dir for module support files
1741 # clean it up only when building all modules
1742 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1743                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1744
1745 # read all saved command lines
1746
1747 targets := $(wildcard $(sort $(targets)))
1748 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1749
1750 ifneq ($(cmd_files),)
1751   $(cmd_files): ;       # Do not try to update included dependency files
1752   include $(cmd_files)
1753 endif
1754
1755 endif   # skip-makefile
1756
1757 PHONY += FORCE
1758 FORCE:
1759
1760 # Declare the contents of the .PHONY variable as phony.  We keep that
1761 # information in a variable so we can use it in if_changed and friends.
1762 .PHONY: $(PHONY)