Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 14
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc7
   6 NAME = Fearless Coyote
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # o Do not use make's built-in rules and variables
  15 #   (this increases performance and avoids hard-to-debug behaviour);
  16 # o Look for make include files relative to root of kernel src
  17 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  18
  19 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # Avoid interference with shell env settings
  26 unexport GREP_OPTIONS
  27
  28 # We are using a recursive build, so we need to do a little thinking
  29 # to get the ordering right.
  30 #
  31 # Most importantly: sub-Makefiles should only ever modify files in
  32 # their own directory. If in some directory we have a dependency on
  33 # a file in another dir (which doesn't happen often, but it's often
  34 # unavoidable when linking the built-in.o targets which finally
  35 # turn into vmlinux), we will call a sub make in that other dir, and
  36 # after that we are sure that everything which is in that other dir
  37 # is now up to date.
  38 #
  39 # The only cases where we need to modify files which have global
  40 # effects are thus separated out and done before the recursive
  41 # descending is started. They are now explicitly listed as the
  42 # prepare rule.
  43
  44 # Beautify output
  45 # ---------------------------------------------------------------------------
  46 #
  47 # Normally, we echo the whole command before executing it. By making
  48 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  49 # $(quiet) to choose other forms of output instead, e.g.
  50 #
  51 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  52 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  53 #
  54 # If $(quiet) is empty, the whole command will be printed.
  55 # If it is set to "quiet_", only the short version will be printed.
  56 # If it is set to "silent_", nothing will be printed at all, since
  57 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  58 #
  59 # A simple variant is to prefix commands with $(Q) - that's useful
  60 # for commands that shall be hidden in non-verbose mode.
  61 #
  62 #       $(Q)ln $@ :<
  63 #
  64 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  65 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  66 #
  67 # To put more focus on warnings, be less verbose as default
  68 # Use 'make V=1' to see the full commands
  69
  70 ifeq ("$(origin V)", "command line")
  71   KBUILD_VERBOSE = $(V)
  72 endif
  73 ifndef KBUILD_VERBOSE
  74   KBUILD_VERBOSE = 0
  75 endif
  76
  77 ifeq ($(KBUILD_VERBOSE),1)
  78   quiet =
  79   Q =
  80 else
  81   quiet=quiet_
  82   Q = @
  83 endif
  84
  85 # If the user is running make -s (silent mode), suppress echoing of
  86 # commands
  87
  88 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  89   quiet=silent_
  90   tools_silent=s
  91 endif
  92
  93 export quiet Q KBUILD_VERBOSE
  94
  95 # kbuild supports saving output files in a separate directory.
  96 # To locate output files in a separate directory two syntaxes are supported.
  97 # In both cases the working directory must be the root of the kernel src.
  98 # 1) O=
  99 # Use "make O=dir/to/store/output/files/"
 100 #
 101 # 2) Set KBUILD_OUTPUT
 102 # Set the environment variable KBUILD_OUTPUT to point to the directory
 103 # where the output files shall be placed.
 104 # export KBUILD_OUTPUT=dir/to/store/output/files/
 105 # make
 106 #
 107 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 108 # variable.
 109
 110 # KBUILD_SRC is not intended to be used by the regular user (for now),
 111 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 112 ifeq ($(KBUILD_SRC),)
 113
 114 # OK, Make called in directory where kernel src resides
 115 # Do we want to locate output files in a separate directory?
 116 ifeq ("$(origin O)", "command line")
 117   KBUILD_OUTPUT := $(O)
 118 endif
 119
 120 # That's our default target when none is given on the command line
 121 PHONY := _all
 122 _all:
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && /bin/pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Use make M=dir to specify directory of external module to build
 180 # Old syntax make ... SUBDIRS=$PWD is still supported
 181 # Setting the environment variable KBUILD_EXTMOD take precedence
 182 ifdef SUBDIRS
 183   KBUILD_EXTMOD ?= $(SUBDIRS)
 184 endif
 185
 186 ifeq ("$(origin M)", "command line")
 187   KBUILD_EXTMOD := $(M)
 188 endif
 189
 190 # If building an external module we do not care about the all: rule
 191 # but instead _all depend on modules
 192 PHONY += all
 193 ifeq ($(KBUILD_EXTMOD),)
 194 _all: all
 195 else
 196 _all: modules
 197 endif
 198
 199 ifeq ($(KBUILD_SRC),)
 200         # building in the source tree
 201         srctree := .
 202 else
 203         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 204                 # building in a subdirectory of the source tree
 205                 srctree := ..
 206         else
 207                 srctree := $(KBUILD_SRC)
 208         endif
 209 endif
 210 objtree         := .
 211 src             := $(srctree)
 212 obj             := $(objtree)
 213
 214 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 215
 216 export srctree objtree VPATH
 217
 218 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 219 # first, and if a usermode build is happening, the "ARCH=um" on the command
 220 # line overrides the setting of ARCH below.  If a native build is happening,
 221 # then ARCH is assigned, getting whatever value it gets normally, and
 222 # SUBARCH is subsequently ignored.
 223
 224 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 225                                   -e s/sun4u/sparc64/ \
 226                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 227                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 228                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 229                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 230
 231 # Cross compiling and selecting different set of gcc/bin-utils
 232 # ---------------------------------------------------------------------------
 233 #
 234 # When performing cross compilation for other architectures ARCH shall be set
 235 # to the target architecture. (See arch/* for the possibilities).
 236 # ARCH can be set during invocation of make:
 237 # make ARCH=ia64
 238 # Another way is to have ARCH set in the environment.
 239 # The default ARCH is the host where make is executed.
 240
 241 # CROSS_COMPILE specify the prefix used for all executables used
 242 # during compilation. Only gcc and related bin-utils executables
 243 # are prefixed with $(CROSS_COMPILE).
 244 # CROSS_COMPILE can be set on the command line
 245 # make CROSS_COMPILE=ia64-linux-
 246 # Alternatively CROSS_COMPILE can be set in the environment.
 247 # A third alternative is to store a setting in .config so that plain
 248 # "make" in the configured kernel build directory always uses that.
 249 # Default value for CROSS_COMPILE is not to prefix executables
 250 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 251 ARCH            ?= $(SUBARCH)
 252 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 253
 254 # Architecture as present in compile.h
 255 UTS_MACHINE     := $(ARCH)
 256 SRCARCH         := $(ARCH)
 257
 258 # Additional ARCH settings for x86
 259 ifeq ($(ARCH),i386)
 260         SRCARCH := x86
 261 endif
 262 ifeq ($(ARCH),x86_64)
 263         SRCARCH := x86
 264 endif
 265
 266 # Additional ARCH settings for sparc
 267 ifeq ($(ARCH),sparc32)
 268        SRCARCH := sparc
 269 endif
 270 ifeq ($(ARCH),sparc64)
 271        SRCARCH := sparc
 272 endif
 273
 274 # Additional ARCH settings for sh
 275 ifeq ($(ARCH),sh64)
 276        SRCARCH := sh
 277 endif
 278
 279 # Additional ARCH settings for tile
 280 ifeq ($(ARCH),tilepro)
 281        SRCARCH := tile
 282 endif
 283 ifeq ($(ARCH),tilegx)
 284        SRCARCH := tile
 285 endif
 286
 287 # Where to locate arch specific headers
 288 hdr-arch  := $(SRCARCH)
 289
 290 KCONFIG_CONFIG  ?= .config
 291 export KCONFIG_CONFIG
 292
 293 # SHELL used by kbuild
 294 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 295           else if [ -x /bin/bash ]; then echo /bin/bash; \
 296           else echo sh; fi ; fi)
 297
 298 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
 299 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
 300 HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
 301
 302 HOSTCC       = gcc
 303 HOSTCXX      = g++
 304 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 305                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 306 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 307 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 308 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 309
 310 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 311 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 312                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 313 endif
 314
 315 # Decide whether to build built-in, modular, or both.
 316 # Normally, just do built-in.
 317
 318 KBUILD_MODULES :=
 319 KBUILD_BUILTIN := 1
 320
 321 # If we have only "make modules", don't compile built-in objects.
 322 # When we're building modules with modversions, we need to consider
 323 # the built-in objects during the descend as well, in order to
 324 # make sure the checksums are up to date before we record them.
 325
 326 ifeq ($(MAKECMDGOALS),modules)
 327   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 328 endif
 329
 330 # If we have "make <whatever> modules", compile modules
 331 # in addition to whatever we do anyway.
 332 # Just "make" or "make all" shall build modules as well
 333
 334 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 335   KBUILD_MODULES := 1
 336 endif
 337
 338 ifeq ($(MAKECMDGOALS),)
 339   KBUILD_MODULES := 1
 340 endif
 341
 342 export KBUILD_MODULES KBUILD_BUILTIN
 343 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 344
 345 # We need some generic definitions (do not try to remake the file).
 346 scripts/Kbuild.include: ;
 347 include scripts/Kbuild.include
 348
 349 # Make variables (CC, etc...)
 350 AS              = $(CROSS_COMPILE)as
 351 LD              = $(CROSS_COMPILE)ld
 352 CC              = $(CROSS_COMPILE)gcc
 353 CPP             = $(CC) -E
 354 AR              = $(CROSS_COMPILE)ar
 355 NM              = $(CROSS_COMPILE)nm
 356 STRIP           = $(CROSS_COMPILE)strip
 357 OBJCOPY         = $(CROSS_COMPILE)objcopy
 358 OBJDUMP         = $(CROSS_COMPILE)objdump
 359 AWK             = awk
 360 GENKSYMS        = scripts/genksyms/genksyms
 361 INSTALLKERNEL  := installkernel
 362 DEPMOD          = /sbin/depmod
 363 PERL            = perl
 364 PYTHON          = python
 365 CHECK           = sparse
 366
 367 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 368                   -Wbitwise -Wno-return-void $(CF)
 369 NOSTDINC_FLAGS  =
 370 CFLAGS_MODULE   =
 371 AFLAGS_MODULE   =
 372 LDFLAGS_MODULE  =
 373 CFLAGS_KERNEL   =
 374 AFLAGS_KERNEL   =
 375 LDFLAGS_vmlinux =
 376 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 377 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 378
 379
 380 # Use USERINCLUDE when you must reference the UAPI directories only.
 381 USERINCLUDE    := \
 382                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 383                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 384                 -I$(srctree)/include/uapi \
 385                 -I$(objtree)/include/generated/uapi \
 386                 -include $(srctree)/include/linux/kconfig.h
 387
 388 # Use LINUXINCLUDE when you must reference the include/ directory.
 389 # Needed to be compatible with the O= option
 390 LINUXINCLUDE    := \
 391                 -I$(srctree)/arch/$(hdr-arch)/include \
 392                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 393                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 394                 -I$(objtree)/include \
 395                 $(USERINCLUDE)
 396
 397 KBUILD_CPPFLAGS := -D__KERNEL__
 398
 399 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 400                    -fno-strict-aliasing -fno-common -fshort-wchar \
 401                    -Werror-implicit-function-declaration \
 402                    -Wno-format-security \
 403                    -std=gnu89 $(call cc-option,-fno-PIE)
 404
 405
 406 KBUILD_AFLAGS_KERNEL :=
 407 KBUILD_CFLAGS_KERNEL :=
 408 KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
 409 KBUILD_AFLAGS_MODULE  := -DMODULE
 410 KBUILD_CFLAGS_MODULE  := -DMODULE
 411 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 412
 413 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 414 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 415 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 416
 417 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 418 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 419 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 420 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 421 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 422
 423 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 424 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
 425 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 426 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 427 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 428 export KBUILD_ARFLAGS
 429
 430 # When compiling out-of-tree modules, put MODVERDIR in the module
 431 # tree rather than in the kernel tree. The kernel tree might
 432 # even be read-only.
 433 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 434
 435 # Files to ignore in find ... statements
 436
 437 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 438                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 439                           -prune -o
 440 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 441                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 442
 443 # ===========================================================================
 444 # Rules shared between *config targets and build targets
 445
 446 # Basic helpers built in scripts/basic/
 447 PHONY += scripts_basic
 448 scripts_basic:
 449         $(Q)$(MAKE) $(build)=scripts/basic
 450         $(Q)rm -f .tmp_quiet_recordmcount
 451
 452 # To avoid any implicit rule to kick in, define an empty command.
 453 scripts/basic/%: scripts_basic ;
 454
 455 PHONY += outputmakefile
 456 # outputmakefile generates a Makefile in the output directory, if using a
 457 # separate output directory. This allows convenient use of make in the
 458 # output directory.
 459 outputmakefile:
 460 ifneq ($(KBUILD_SRC),)
 461         $(Q)ln -fsn $(srctree) source
 462         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 463             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 464 endif
 465
 466 # Support for using generic headers in asm-generic
 467 PHONY += asm-generic uapi-asm-generic
 468 asm-generic: uapi-asm-generic
 469         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 470                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 471 uapi-asm-generic:
 472         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 473                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 474
 475 # To make sure we do not include .config for any of the *config targets
 476 # catch them early, and hand them over to scripts/kconfig/Makefile
 477 # It is allowed to specify more targets when calling make, including
 478 # mixing *config targets and build targets.
 479 # For example 'make oldconfig all'.
 480 # Detect when mixed targets is specified, and make a second invocation
 481 # of make so .config is not included in this case either (for *config).
 482
 483 version_h := include/generated/uapi/linux/version.h
 484 old_version_h := include/linux/version.h
 485
 486 no-dot-config-targets := clean mrproper distclean \
 487                          cscope gtags TAGS tags help% %docs check% coccicheck \
 488                          $(version_h) headers_% archheaders archscripts \
 489                          kernelversion %src-pkg
 490
 491 config-targets := 0
 492 mixed-targets  := 0
 493 dot-config     := 1
 494
 495 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 496         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 497                 dot-config := 0
 498         endif
 499 endif
 500
 501 ifeq ($(KBUILD_EXTMOD),)
 502         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 503                 config-targets := 1
 504                 ifneq ($(words $(MAKECMDGOALS)),1)
 505                         mixed-targets := 1
 506                 endif
 507         endif
 508 endif
 509 # install and modules_install need also be processed one by one
 510 ifneq ($(filter install,$(MAKECMDGOALS)),)
 511         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 512                 mixed-targets := 1
 513         endif
 514 endif
 515
 516 ifeq ($(mixed-targets),1)
 517 # ===========================================================================
 518 # We're called with mixed targets (*config and build targets).
 519 # Handle them one by one.
 520
 521 PHONY += $(MAKECMDGOALS) __build_one_by_one
 522
 523 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 524         @:
 525
 526 __build_one_by_one:
 527         $(Q)set -e; \
 528         for i in $(MAKECMDGOALS); do \
 529                 $(MAKE) -f $(srctree)/Makefile $$i; \
 530         done
 531
 532 else
 533 ifeq ($(config-targets),1)
 534 # ===========================================================================
 535 # *config targets only - make sure prerequisites are updated, and descend
 536 # in scripts/kconfig to make the *config target
 537
 538 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 539 # KBUILD_DEFCONFIG may point out an alternative default configuration
 540 # used for 'make defconfig'
 541 include arch/$(SRCARCH)/Makefile
 542 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 543
 544 config: scripts_basic outputmakefile FORCE
 545         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 546
 547 %config: scripts_basic outputmakefile FORCE
 548         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 549
 550 else
 551 # ===========================================================================
 552 # Build targets only - this includes vmlinux, arch specific targets, clean
 553 # targets and others. In general all targets except *config targets.
 554
 555 ifeq ($(KBUILD_EXTMOD),)
 556 # Additional helpers built in scripts/
 557 # Carefully list dependencies so we do not try to build scripts twice
 558 # in parallel
 559 PHONY += scripts
 560 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 561          asm-generic gcc-plugins
 562         $(Q)$(MAKE) $(build)=$(@)
 563
 564 # Objects we will link into vmlinux / subdirs we need to visit
 565 init-y          := init/
 566 drivers-y       := drivers/ sound/ firmware/
 567 net-y           := net/
 568 libs-y          := lib/
 569 core-y          := usr/
 570 virt-y          := virt/
 571 endif # KBUILD_EXTMOD
 572
 573 ifeq ($(dot-config),1)
 574 # Read in config
 575 -include include/config/auto.conf
 576
 577 ifeq ($(KBUILD_EXTMOD),)
 578 # Read in dependencies to all Kconfig* files, make sure to run
 579 # oldconfig if changes are detected.
 580 -include include/config/auto.conf.cmd
 581
 582 # To avoid any implicit rule to kick in, define an empty command
 583 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 584
 585 # If .config is newer than include/config/auto.conf, someone tinkered
 586 # with it and forgot to run make oldconfig.
 587 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 588 # we execute the config step to be sure to catch updated Kconfig files
 589 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 590         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 591 else
 592 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 593 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 594 PHONY += include/config/auto.conf
 595
 596 include/config/auto.conf:
 597         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 598         echo >&2;                                                       \
 599         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 600         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 601         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 602         echo >&2 ;                                                      \
 603         /bin/false)
 604
 605 endif # KBUILD_EXTMOD
 606
 607 else
 608 # Dummy target needed, because used as prerequisite
 609 include/config/auto.conf: ;
 610 endif # $(dot-config)
 611
 612 # For the kernel to actually contain only the needed exported symbols,
 613 # we have to build modules as well to determine what those symbols are.
 614 # (this can be evaluated only once include/config/auto.conf has been included)
 615 ifdef CONFIG_TRIM_UNUSED_KSYMS
 616   KBUILD_MODULES := 1
 617 endif
 618
 619 # The all: target is the default when no target is given on the
 620 # command line.
 621 # This allow a user to issue only 'make' to build a kernel including modules
 622 # Defaults to vmlinux, but the arch makefile usually adds further targets
 623 all: vmlinux
 624
 625 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 626 # values of the respective KBUILD_* variables
 627 ARCH_CPPFLAGS :=
 628 ARCH_AFLAGS :=
 629 ARCH_CFLAGS :=
 630 include arch/$(SRCARCH)/Makefile
 631
 632 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 633 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 634 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 635 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 636 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 637
 638 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 639 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 640 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 641 else
 642 ifdef CONFIG_PROFILE_ALL_BRANCHES
 643 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 644 else
 645 KBUILD_CFLAGS   += -O2
 646 endif
 647 endif
 648
 649 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 650                         $(call cc-disable-warning,maybe-uninitialized,))
 651
 652 # Tell gcc to never replace conditional load with a non-conditional one
 653 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 654
 655 # check for 'asm goto'
 656 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 657         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 658         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 659 endif
 660
 661 include scripts/Makefile.gcc-plugins
 662
 663 ifdef CONFIG_READABLE_ASM
 664 # Disable optimizations that make assembler listings hard to read.
 665 # reorder blocks reorders the control in the function
 666 # ipa clone creates specialized cloned functions
 667 # partial inlining inlines only parts of functions
 668 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 669                  $(call cc-option,-fno-ipa-cp-clone,) \
 670                  $(call cc-option,-fno-partial-inlining)
 671 endif
 672
 673 ifneq ($(CONFIG_FRAME_WARN),0)
 674 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 675 endif
 676
 677 # This selects the stack protector compiler flag. Testing it is delayed
 678 # until after .config has been reprocessed, in the prepare-compiler-check
 679 # target.
 680 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 681   stackp-flag := -fstack-protector
 682   stackp-name := REGULAR
 683 else
 684 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 685   stackp-flag := -fstack-protector-strong
 686   stackp-name := STRONG
 687 else
 688   # Force off for distro compilers that enable stack protector by default.
 689   stackp-flag := $(call cc-option, -fno-stack-protector)
 690 endif
 691 endif
 692 # Find arch-specific stack protector compiler sanity-checking script.
 693 ifdef CONFIG_CC_STACKPROTECTOR
 694   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 695   stackp-check := $(wildcard $(stackp-path))
 696 endif
 697 KBUILD_CFLAGS += $(stackp-flag)
 698
 699 ifeq ($(cc-name),clang)
 700 ifneq ($(CROSS_COMPILE),)
 701 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 702 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 703 endif
 704 ifneq ($(GCC_TOOLCHAIN),)
 705 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 706 endif
 707 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 708 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 709 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 710 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 711 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 712 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 713 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 714 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 715 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 716 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 717 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 718 # See modpost pattern 2
 719 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 720 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 721 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 722 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 723 else
 724
 725 # These warnings generated too much noise in a regular build.
 726 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 727 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 728 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 729 endif
 730
 731 ifdef CONFIG_FRAME_POINTER
 732 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 733 else
 734 # Some targets (ARM with Thumb2, for example), can't be built with frame
 735 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 736 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 737 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 738 # -fomit-frame-pointer with FUNCTION_TRACER.
 739 ifndef CONFIG_FUNCTION_TRACER
 740 KBUILD_CFLAGS   += -fomit-frame-pointer
 741 endif
 742 endif
 743
 744 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 745
 746 ifdef CONFIG_DEBUG_INFO
 747 ifdef CONFIG_DEBUG_INFO_SPLIT
 748 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 749 else
 750 KBUILD_CFLAGS   += -g
 751 endif
 752 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 753 endif
 754 ifdef CONFIG_DEBUG_INFO_DWARF4
 755 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 756 endif
 757
 758 ifdef CONFIG_DEBUG_INFO_REDUCED
 759 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 760                    $(call cc-option,-fno-var-tracking)
 761 endif
 762
 763 ifdef CONFIG_FUNCTION_TRACER
 764 ifndef CC_FLAGS_FTRACE
 765 CC_FLAGS_FTRACE := -pg
 766 endif
 767 export CC_FLAGS_FTRACE
 768 ifdef CONFIG_HAVE_FENTRY
 769 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 770 endif
 771 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 772 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 773 ifdef CONFIG_DYNAMIC_FTRACE
 774         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 775                 BUILD_C_RECORDMCOUNT := y
 776                 export BUILD_C_RECORDMCOUNT
 777         endif
 778 endif
 779 endif
 780
 781 # We trigger additional mismatches with less inlining
 782 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 783 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 784 endif
 785
 786 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 787 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 788 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 789 endif
 790
 791 # arch Makefile may override CC so keep this after arch Makefile is included
 792 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 793 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 794
 795 # warn about C99 declaration after statement
 796 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 797
 798 # disable pointer signed / unsigned warnings in gcc 4.0
 799 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 800
 801 # disable invalid "can't wrap" optimizations for signed / pointers
 802 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 803
 804 # conserve stack if available
 805 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 806
 807 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 808 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 809
 810 # require functions to have arguments in prototypes, not empty 'int foo()'
 811 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 812
 813 # Prohibit date/time macros, which would make the build non-deterministic
 814 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 815
 816 # enforce correct pointer usage
 817 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 818
 819 # Require designated initializers for all marked structures
 820 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 821
 822 # use the deterministic mode of AR if available
 823 KBUILD_ARFLAGS := $(call ar-option,D)
 824
 825 include scripts/Makefile.kasan
 826 include scripts/Makefile.extrawarn
 827 include scripts/Makefile.ubsan
 828
 829 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 830 # last assignments
 831 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 832 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 833 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 834
 835 # Use --build-id when available.
 836 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 837                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 838 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 839 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 840
 841 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 842 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 843 endif
 844
 845 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 846 LDFLAGS_vmlinux += $(call ld-option, -X,)
 847 endif
 848
 849 # Default kernel image to build when no specific target is given.
 850 # KBUILD_IMAGE may be overruled on the command line or
 851 # set in the environment
 852 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 853 # this default value
 854 export KBUILD_IMAGE ?= vmlinux
 855
 856 #
 857 # INSTALL_PATH specifies where to place the updated kernel and system map
 858 # images. Default is /boot, but you can set it to other values
 859 export  INSTALL_PATH ?= /boot
 860
 861 #
 862 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 863 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 864 # an argument if needed. Otherwise it defaults to the kernel install path
 865 #
 866 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 867
 868 #
 869 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 870 # relocations required by build roots.  This is not defined in the
 871 # makefile but the argument can be passed to make if needed.
 872 #
 873
 874 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 875 export MODLIB
 876
 877 #
 878 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 879 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 880 # the default option --strip-debug will be used.  Otherwise,
 881 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 882
 883 ifdef INSTALL_MOD_STRIP
 884 ifeq ($(INSTALL_MOD_STRIP),1)
 885 mod_strip_cmd = $(STRIP) --strip-debug
 886 else
 887 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 888 endif # INSTALL_MOD_STRIP=1
 889 else
 890 mod_strip_cmd = true
 891 endif # INSTALL_MOD_STRIP
 892 export mod_strip_cmd
 893
 894 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 895 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 896 # or CONFIG_MODULE_COMPRESS_XZ.
 897
 898 mod_compress_cmd = true
 899 ifdef CONFIG_MODULE_COMPRESS
 900   ifdef CONFIG_MODULE_COMPRESS_GZIP
 901     mod_compress_cmd = gzip -n -f
 902   endif # CONFIG_MODULE_COMPRESS_GZIP
 903   ifdef CONFIG_MODULE_COMPRESS_XZ
 904     mod_compress_cmd = xz -f
 905   endif # CONFIG_MODULE_COMPRESS_XZ
 906 endif # CONFIG_MODULE_COMPRESS
 907 export mod_compress_cmd
 908
 909 # Select initial ramdisk compression format, default is gzip(1).
 910 # This shall be used by the dracut(8) tool while creating an initramfs image.
 911 #
 912 INITRD_COMPRESS-y                  := gzip
 913 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 914 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 915 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 916 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 917 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 918 # do not export INITRD_COMPRESS, since we didn't actually
 919 # choose a sane default compression above.
 920 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 921
 922 ifdef CONFIG_MODULE_SIG_ALL
 923 $(eval $(call config_filename,MODULE_SIG_KEY))
 924
 925 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 926 else
 927 mod_sign_cmd = true
 928 endif
 929 export mod_sign_cmd
 930
 931 ifdef CONFIG_STACK_VALIDATION
 932   has_libelf := $(call try-run,\
 933                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 934   ifeq ($(has_libelf),1)
 935     objtool_target := tools/objtool FORCE
 936   else
 937     ifdef CONFIG_ORC_UNWINDER
 938       $(error "Cannot generate ORC metadata for CONFIG_ORC_UNWINDER=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 939     else
 940       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 941     endif
 942     SKIP_STACK_VALIDATION := 1
 943     export SKIP_STACK_VALIDATION
 944   endif
 945 endif
 946
 947
 948 ifeq ($(KBUILD_EXTMOD),)
 949 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 950
 951 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 952                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 953                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 954
 955 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 956                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 957
 958 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 959 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 960 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 961 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 962 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 963 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
 964 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 965
 966 # Externally visible symbols (used by link-vmlinux.sh)
 967 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 968 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 969 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 970 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 971 export LDFLAGS_vmlinux
 972 # used by scripts/package/Makefile
 973 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 974
 975 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 976
 977 # Include targets which we want to execute sequentially if the rest of the
 978 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 979 # evaluated more than once.
 980 PHONY += vmlinux_prereq
 981 vmlinux_prereq: $(vmlinux-deps) FORCE
 982 ifdef CONFIG_HEADERS_CHECK
 983         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 984 endif
 985 ifdef CONFIG_GDB_SCRIPTS
 986         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
 987 endif
 988 ifdef CONFIG_TRIM_UNUSED_KSYMS
 989         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 990           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 991 endif
 992
 993 # standalone target for easier testing
 994 include/generated/autoksyms.h: FORCE
 995         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 996
 997 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 998
 999 # Final link of vmlinux with optional arch pass after final link
1000 cmd_link-vmlinux =                                                 \
1001         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1002         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1003
1004 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1005         +$(call if_changed,link-vmlinux)
1006
1007 # Build samples along the rest of the kernel
1008 ifdef CONFIG_SAMPLES
1009 vmlinux-dirs += samples
1010 endif
1011
1012 # The actual objects are generated when descending,
1013 # make sure no implicit rule kicks in
1014 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1015
1016 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1017 # Preset locale variables to speed up the build process. Limit locale
1018 # tweaks to this spot to avoid wrong language settings when running
1019 # make menuconfig etc.
1020 # Error messages still appears in the original language
1021
1022 PHONY += $(vmlinux-dirs)
1023 $(vmlinux-dirs): prepare scripts
1024         $(Q)$(MAKE) $(build)=$@
1025
1026 define filechk_kernel.release
1027         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1028 endef
1029
1030 # Store (new) KERNELRELEASE string in include/config/kernel.release
1031 include/config/kernel.release: include/config/auto.conf FORCE
1032         $(call filechk,kernel.release)
1033
1034
1035 # Things we need to do before we recursively start building the kernel
1036 # or the modules are listed in "prepare".
1037 # A multi level approach is used. prepareN is processed before prepareN-1.
1038 # archprepare is used in arch Makefiles and when processed asm symlink,
1039 # version.h and scripts_basic is processed / created.
1040
1041 # Listed in dependency order
1042 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1043
1044 # prepare3 is used to check if we are building in a separate output directory,
1045 # and if so do:
1046 # 1) Check that make has not been executed in the kernel src $(srctree)
1047 prepare3: include/config/kernel.release
1048 ifneq ($(KBUILD_SRC),)
1049         @$(kecho) '  Using $(srctree) as source for kernel'
1050         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1051                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1052                 echo >&2 "  in the '$(srctree)' directory.";\
1053                 /bin/false; \
1054         fi;
1055 endif
1056
1057 # prepare2 creates a makefile if using a separate output directory.
1058 # From this point forward, .config has been reprocessed, so any rules
1059 # that need to depend on updated CONFIG_* values can be checked here.
1060 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1061
1062 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1063                    include/config/auto.conf
1064         $(cmd_crmodverdir)
1065
1066 archprepare: archheaders archscripts prepare1 scripts_basic
1067
1068 prepare0: archprepare gcc-plugins
1069         $(Q)$(MAKE) $(build)=.
1070
1071 # All the preparing..
1072 prepare: prepare0 prepare-objtool
1073
1074 PHONY += prepare-objtool
1075 prepare-objtool: $(objtool_target)
1076
1077 # Check for CONFIG flags that require compiler support. Abort the build
1078 # after .config has been processed, but before the kernel build starts.
1079 #
1080 # For security-sensitive CONFIG options, we don't want to fallback and/or
1081 # silently change which compiler flags will be used, since that leads to
1082 # producing kernels with different security feature characteristics
1083 # depending on the compiler used. (For example, "But I selected
1084 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1085 PHONY += prepare-compiler-check
1086 prepare-compiler-check: FORCE
1087 # Make sure compiler supports requested stack protector flag.
1088 ifdef stackp-name
1089   ifeq ($(call cc-option, $(stackp-flag)),)
1090         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1091                   $(stackp-flag) not supported by compiler >&2 && exit 1
1092   endif
1093 endif
1094 # Make sure compiler does not have buggy stack-protector support.
1095 ifdef stackp-check
1096   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1097         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1098                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1099   endif
1100 endif
1101         @:
1102
1103 # Generate some files
1104 # ---------------------------------------------------------------------------
1105
1106 # KERNELRELEASE can change from a few different places, meaning version.h
1107 # needs to be updated, so this check is forced on all builds
1108
1109 uts_len := 64
1110 define filechk_utsrelease.h
1111         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1112           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1113           exit 1;                                                         \
1114         fi;                                                               \
1115         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1116 endef
1117
1118 define filechk_version.h
1119         (echo \#define LINUX_VERSION_CODE $(shell                         \
1120         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1121         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1122 endef
1123
1124 $(version_h): $(srctree)/Makefile FORCE
1125         $(call filechk,version.h)
1126         $(Q)rm -f $(old_version_h)
1127
1128 include/generated/utsrelease.h: include/config/kernel.release FORCE
1129         $(call filechk,utsrelease.h)
1130
1131 PHONY += headerdep
1132 headerdep:
1133         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1134         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1135
1136 # ---------------------------------------------------------------------------
1137 # Kernel headers
1138
1139 #Default location for installed headers
1140 export INSTALL_HDR_PATH = $(objtree)/usr
1141
1142 # If we do an all arch process set dst to include/arch-$(hdr-arch)
1143 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
1144
1145 PHONY += archheaders
1146 archheaders:
1147
1148 PHONY += archscripts
1149 archscripts:
1150
1151 PHONY += __headers
1152 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1153         $(Q)$(MAKE) $(build)=scripts build_unifdef
1154
1155 PHONY += headers_install_all
1156 headers_install_all:
1157         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1158
1159 PHONY += headers_install
1160 headers_install: __headers
1161         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1162           $(error Headers not exportable for the $(SRCARCH) architecture))
1163         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1164         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
1165
1166 PHONY += headers_check_all
1167 headers_check_all: headers_install_all
1168         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1169
1170 PHONY += headers_check
1171 headers_check: headers_install
1172         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1173         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
1174
1175 # ---------------------------------------------------------------------------
1176 # Kernel selftest
1177
1178 PHONY += kselftest
1179 kselftest:
1180         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1181
1182 PHONY += kselftest-clean
1183 kselftest-clean:
1184         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1185
1186 PHONY += kselftest-merge
1187 kselftest-merge:
1188         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1189         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1190                 -m $(objtree)/.config \
1191                 $(srctree)/tools/testing/selftests/*/config
1192         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1193
1194 # ---------------------------------------------------------------------------
1195 # Modules
1196
1197 ifdef CONFIG_MODULES
1198
1199 # By default, build modules as well
1200
1201 all: modules
1202
1203 # Build modules
1204 #
1205 # A module can be listed more than once in obj-m resulting in
1206 # duplicate lines in modules.order files.  Those are removed
1207 # using awk while concatenating to the final file.
1208
1209 PHONY += modules
1210 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1211         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1212         @$(kecho) '  Building modules, stage 2.';
1213         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1214
1215 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1216         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1217
1218 %/modules.builtin: include/config/auto.conf
1219         $(Q)$(MAKE) $(modbuiltin)=$*
1220
1221
1222 # Target to prepare building external modules
1223 PHONY += modules_prepare
1224 modules_prepare: prepare scripts
1225
1226 # Target to install modules
1227 PHONY += modules_install
1228 modules_install: _modinst_ _modinst_post
1229
1230 PHONY += _modinst_
1231 _modinst_:
1232         @rm -rf $(MODLIB)/kernel
1233         @rm -f $(MODLIB)/source
1234         @mkdir -p $(MODLIB)/kernel
1235         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1236         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1237                 rm -f $(MODLIB)/build ; \
1238                 ln -s $(CURDIR) $(MODLIB)/build ; \
1239         fi
1240         @cp -f $(objtree)/modules.order $(MODLIB)/
1241         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1242         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1243
1244 # This depmod is only for convenience to give the initial
1245 # boot a modules.dep even before / is mounted read-write.  However the
1246 # boot script depmod is the master version.
1247 PHONY += _modinst_post
1248 _modinst_post: _modinst_
1249         $(call cmd,depmod)
1250
1251 ifeq ($(CONFIG_MODULE_SIG), y)
1252 PHONY += modules_sign
1253 modules_sign:
1254         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1255 endif
1256
1257 else # CONFIG_MODULES
1258
1259 # Modules not configured
1260 # ---------------------------------------------------------------------------
1261
1262 PHONY += modules modules_install
1263 modules modules_install:
1264         @echo >&2
1265         @echo >&2 "The present kernel configuration has modules disabled."
1266         @echo >&2 "Type 'make config' and enable loadable module support."
1267         @echo >&2 "Then build a kernel with module support enabled."
1268         @echo >&2
1269         @exit 1
1270
1271 endif # CONFIG_MODULES
1272
1273 ###
1274 # Cleaning is done on three levels.
1275 # make clean     Delete most generated files
1276 #                Leave enough to build external modules
1277 # make mrproper  Delete the current configuration, and all generated files
1278 # make distclean Remove editor backup files, patch leftover files and the like
1279
1280 # Directories & files removed with 'make clean'
1281 CLEAN_DIRS  += $(MODVERDIR)
1282
1283 # Directories & files removed with 'make mrproper'
1284 MRPROPER_DIRS  += include/config usr/include include/generated          \
1285                   arch/*/include/generated .tmp_objdiff
1286 MRPROPER_FILES += .config .config.old .version .old_version \
1287                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1288                   signing_key.pem signing_key.priv signing_key.x509     \
1289                   x509.genkey extra_certificates signing_key.x509.keyid \
1290                   signing_key.x509.signer vmlinux-gdb.py
1291
1292 # clean - Delete most, but leave enough to build external modules
1293 #
1294 clean: rm-dirs  := $(CLEAN_DIRS)
1295 clean: rm-files := $(CLEAN_FILES)
1296 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1297
1298 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1299 $(clean-dirs):
1300         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1301
1302 vmlinuxclean:
1303         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1304         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1305
1306 clean: archclean vmlinuxclean
1307
1308 # mrproper - Delete all generated files, including .config
1309 #
1310 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1311 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1312 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1313
1314 PHONY += $(mrproper-dirs) mrproper archmrproper
1315 $(mrproper-dirs):
1316         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1317
1318 mrproper: clean archmrproper $(mrproper-dirs)
1319         $(call cmd,rmdirs)
1320         $(call cmd,rmfiles)
1321
1322 # distclean
1323 #
1324 PHONY += distclean
1325
1326 distclean: mrproper
1327         @find $(srctree) $(RCS_FIND_IGNORE) \
1328                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1329                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1330                 -o -name 'core' \) \
1331                 -type f -print | xargs rm -f
1332
1333
1334 # Packaging of the kernel to various formats
1335 # ---------------------------------------------------------------------------
1336 # rpm target kept for backward compatibility
1337 package-dir     := scripts/package
1338
1339 %src-pkg: FORCE
1340         $(Q)$(MAKE) $(build)=$(package-dir) $@
1341 %pkg: include/config/kernel.release FORCE
1342         $(Q)$(MAKE) $(build)=$(package-dir) $@
1343 rpm: include/config/kernel.release FORCE
1344         $(Q)$(MAKE) $(build)=$(package-dir) $@
1345
1346
1347 # Brief documentation of the typical targets used
1348 # ---------------------------------------------------------------------------
1349
1350 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1351 boards := $(sort $(notdir $(boards)))
1352 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1353 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1354
1355 PHONY += help
1356 help:
1357         @echo  'Cleaning targets:'
1358         @echo  '  clean           - Remove most generated files but keep the config and'
1359         @echo  '                    enough build support to build external modules'
1360         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1361         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1362         @echo  ''
1363         @echo  'Configuration targets:'
1364         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1365         @echo  ''
1366         @echo  'Other generic targets:'
1367         @echo  '  all             - Build all targets marked with [*]'
1368         @echo  '* vmlinux         - Build the bare kernel'
1369         @echo  '* modules         - Build all modules'
1370         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1371         @echo  '  dir/            - Build all files in dir and below'
1372         @echo  '  dir/file.[ois]  - Build specified target only'
1373         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1374         @echo  '                    (requires compiler support for LLVM assembly generation)'
1375         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1376         @echo  '                    (requires a recent binutils and recent build (System.map))'
1377         @echo  '  dir/file.ko     - Build module including final link'
1378         @echo  '  modules_prepare - Set up for building external modules'
1379         @echo  '  tags/TAGS       - Generate tags file for editors'
1380         @echo  '  cscope          - Generate cscope index'
1381         @echo  '  gtags           - Generate GNU GLOBAL index'
1382         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1383         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1384         @echo  '  image_name      - Output the image name (use with make -s)'
1385         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1386          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1387          echo  ''
1388         @echo  'Static analysers:'
1389         @echo  '  checkstack      - Generate a list of stack hogs'
1390         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1391         @echo  '  versioncheck    - Sanity check on version.h usage'
1392         @echo  '  includecheck    - Check for duplicate included header files'
1393         @echo  '  export_report   - List the usages of all exported symbols'
1394         @echo  '  headers_check   - Sanity check on exported headers'
1395         @echo  '  headerdep       - Detect inclusion cycles in headers'
1396         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1397         @echo  ''
1398         @echo  'Kernel selftest:'
1399         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1400         @echo  '                    Build, install, and boot kernel before'
1401         @echo  '                    running kselftest on it'
1402         @echo  '  kselftest-clean - Remove all generated kselftest files'
1403         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1404         @echo  '                    .config.'
1405         @echo  ''
1406         @echo 'Userspace tools targets:'
1407         @echo '  use "make tools/help"'
1408         @echo '  or  "cd tools; make help"'
1409         @echo  ''
1410         @echo  'Kernel packaging:'
1411         @$(MAKE) $(build)=$(package-dir) help
1412         @echo  ''
1413         @echo  'Documentation targets:'
1414         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1415         @echo  ''
1416         @echo  'Architecture specific targets ($(SRCARCH)):'
1417         @$(if $(archhelp),$(archhelp),\
1418                 echo '  No architecture specific help defined for $(SRCARCH)')
1419         @echo  ''
1420         @$(if $(boards), \
1421                 $(foreach b, $(boards), \
1422                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1423                 echo '')
1424         @$(if $(board-dirs), \
1425                 $(foreach b, $(board-dirs), \
1426                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1427                 printf "  %-16s - Show all of the above\\n" help-boards; \
1428                 echo '')
1429
1430         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1431         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1432         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1433         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1434         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1435         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1436         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1437         @echo  '                1: warnings which may be relevant and do not occur too often'
1438         @echo  '                2: warnings which occur quite often but may still be relevant'
1439         @echo  '                3: more obscure warnings, can most likely be ignored'
1440         @echo  '                Multiple levels can be combined with W=12 or W=123'
1441         @echo  ''
1442         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1443         @echo  'For further info see the ./README file'
1444
1445
1446 help-board-dirs := $(addprefix help-,$(board-dirs))
1447
1448 help-boards: $(help-board-dirs)
1449
1450 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1451
1452 $(help-board-dirs): help-%:
1453         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1454         @$(if $(boards-per-dir), \
1455                 $(foreach b, $(boards-per-dir), \
1456                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1457                 echo '')
1458
1459
1460 # Documentation targets
1461 # ---------------------------------------------------------------------------
1462 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
1463 PHONY += $(DOC_TARGETS)
1464 $(DOC_TARGETS): scripts_basic FORCE
1465         $(Q)$(MAKE) $(build)=Documentation $@
1466
1467 else # KBUILD_EXTMOD
1468
1469 ###
1470 # External module support.
1471 # When building external modules the kernel used as basis is considered
1472 # read-only, and no consistency checks are made and the make
1473 # system is not used on the basis kernel. If updates are required
1474 # in the basis kernel ordinary make commands (without M=...) must
1475 # be used.
1476 #
1477 # The following are the only valid targets when building external
1478 # modules.
1479 # make M=dir clean     Delete all automatically generated files
1480 # make M=dir modules   Make all modules in specified dir
1481 # make M=dir           Same as 'make M=dir modules'
1482 # make M=dir modules_install
1483 #                      Install the modules built in the module directory
1484 #                      Assumes install directory is already created
1485
1486 # We are always building modules
1487 KBUILD_MODULES := 1
1488 PHONY += crmodverdir
1489 crmodverdir:
1490         $(cmd_crmodverdir)
1491
1492 PHONY += $(objtree)/Module.symvers
1493 $(objtree)/Module.symvers:
1494         @test -e $(objtree)/Module.symvers || ( \
1495         echo; \
1496         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1497         echo "           is missing; modules will have no dependencies and modversions."; \
1498         echo )
1499
1500 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1501 PHONY += $(module-dirs) modules
1502 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1503         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1504
1505 modules: $(module-dirs)
1506         @$(kecho) '  Building modules, stage 2.';
1507         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1508
1509 PHONY += modules_install
1510 modules_install: _emodinst_ _emodinst_post
1511
1512 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1513 PHONY += _emodinst_
1514 _emodinst_:
1515         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1516         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1517
1518 PHONY += _emodinst_post
1519 _emodinst_post: _emodinst_
1520         $(call cmd,depmod)
1521
1522 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1523
1524 PHONY += $(clean-dirs) clean
1525 $(clean-dirs):
1526         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1527
1528 clean:  rm-dirs := $(MODVERDIR)
1529 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1530
1531 PHONY += help
1532 help:
1533         @echo  '  Building external modules.'
1534         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1535         @echo  ''
1536         @echo  '  modules         - default target, build the module(s)'
1537         @echo  '  modules_install - install the module'
1538         @echo  '  clean           - remove generated files in module directory only'
1539         @echo  ''
1540
1541 # Dummies...
1542 PHONY += prepare scripts
1543 prepare: ;
1544 scripts: ;
1545 endif # KBUILD_EXTMOD
1546
1547 clean: $(clean-dirs)
1548         $(call cmd,rmdirs)
1549         $(call cmd,rmfiles)
1550         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1551                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1552                 -o -name '*.ko.*' \
1553                 -o -name '*.dwo'  \
1554                 -o -name '*.su'  \
1555                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1556                 -o -name '*.symtypes' -o -name 'modules.order' \
1557                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1558                 -o -name '*.c.[012]*.*' \
1559                 -o -name '*.ll' \
1560                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1561
1562 # Generate tags for editors
1563 # ---------------------------------------------------------------------------
1564 quiet_cmd_tags = GEN     $@
1565       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1566
1567 tags TAGS cscope gtags: FORCE
1568         $(call cmd,tags)
1569
1570 # Scripts to check various things for consistency
1571 # ---------------------------------------------------------------------------
1572
1573 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1574
1575 includecheck:
1576         find $(srctree)/* $(RCS_FIND_IGNORE) \
1577                 -name '*.[hcS]' -type f -print | sort \
1578                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1579
1580 versioncheck:
1581         find $(srctree)/* $(RCS_FIND_IGNORE) \
1582                 -name '*.[hcS]' -type f -print | sort \
1583                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1584
1585 coccicheck:
1586         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1587
1588 namespacecheck:
1589         $(PERL) $(srctree)/scripts/namespace.pl
1590
1591 export_report:
1592         $(PERL) $(srctree)/scripts/export_report.pl
1593
1594 endif #ifeq ($(config-targets),1)
1595 endif #ifeq ($(mixed-targets),1)
1596
1597 PHONY += checkstack kernelrelease kernelversion image_name
1598
1599 # UML needs a little special treatment here.  It wants to use the host
1600 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1601 # else wants $(ARCH), including people doing cross-builds, which means
1602 # that $(SUBARCH) doesn't work here.
1603 ifeq ($(ARCH), um)
1604 CHECKSTACK_ARCH := $(SUBARCH)
1605 else
1606 CHECKSTACK_ARCH := $(ARCH)
1607 endif
1608 checkstack:
1609         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1610         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1611
1612 kernelrelease:
1613         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1614
1615 kernelversion:
1616         @echo $(KERNELVERSION)
1617
1618 image_name:
1619         @echo $(KBUILD_IMAGE)
1620
1621 # Clear a bunch of variables before executing the submake
1622 tools/: FORCE
1623         $(Q)mkdir -p $(objtree)/tools
1624         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1625
1626 tools/%: FORCE
1627         $(Q)mkdir -p $(objtree)/tools
1628         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1629
1630 # Single targets
1631 # ---------------------------------------------------------------------------
1632 # Single targets are compatible with:
1633 # - build with mixed source and output
1634 # - build with separate output dir 'make O=...'
1635 # - external modules
1636 #
1637 #  target-dir => where to store outputfile
1638 #  build-dir  => directory in kernel source tree to use
1639
1640 ifeq ($(KBUILD_EXTMOD),)
1641         build-dir  = $(patsubst %/,%,$(dir $@))
1642         target-dir = $(dir $@)
1643 else
1644         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1645         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1646         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1647 endif
1648
1649 %.s: %.c prepare scripts FORCE
1650         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1651 %.i: %.c prepare scripts FORCE
1652         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1653 %.o: %.c prepare scripts FORCE
1654         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1655 %.lst: %.c prepare scripts FORCE
1656         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1657 %.s: %.S prepare scripts FORCE
1658         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1659 %.o: %.S prepare scripts FORCE
1660         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1661 %.symtypes: %.c prepare scripts FORCE
1662         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1663 %.ll: %.c prepare scripts FORCE
1664         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1665
1666 # Modules
1667 /: prepare scripts FORCE
1668         $(cmd_crmodverdir)
1669         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1670         $(build)=$(build-dir)
1671 # Make sure the latest headers are built for Documentation
1672 Documentation/ samples/: headers_install
1673 %/: prepare scripts FORCE
1674         $(cmd_crmodverdir)
1675         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1676         $(build)=$(build-dir)
1677 %.ko: prepare scripts FORCE
1678         $(cmd_crmodverdir)
1679         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1680         $(build)=$(build-dir) $(@:.ko=.o)
1681         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1682
1683 # FIXME Should go into a make.lib or something
1684 # ===========================================================================
1685
1686 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1687       cmd_rmdirs = rm -rf $(rm-dirs)
1688
1689 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1690       cmd_rmfiles = rm -f $(rm-files)
1691
1692 # Run depmod only if we have System.map and depmod is executable
1693 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1694       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1695                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1696
1697 # Create temporary dir for module support files
1698 # clean it up only when building all modules
1699 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1700                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1701
1702 # read all saved command lines
1703
1704 targets := $(wildcard $(sort $(targets)))
1705 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1706
1707 ifneq ($(cmd_files),)
1708   $(cmd_files): ;       # Do not try to update included dependency files
1709   include $(cmd_files)
1710 endif
1711
1712 endif   # skip-makefile
1713
1714 PHONY += FORCE
1715 FORCE:
1716
1717 # Declare the contents of the .PHONY variable as phony.  We keep that
1718 # information in a variable so we can use it in if_changed and friends.
1719 .PHONY: $(PHONY)