Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 18
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc6
   6 NAME = Merciless Moray
   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 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.a targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # 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                                                                 && 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 := $(M)
 188 endif
 189
 190 ifeq ($(KBUILD_SRC),)
 191         # building in the source tree
 192         srctree := .
 193 else
 194         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 195                 # building in a subdirectory of the source tree
 196                 srctree := ..
 197         else
 198                 srctree := $(KBUILD_SRC)
 199         endif
 200 endif
 201
 202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 203
 204 objtree         := .
 205 src             := $(srctree)
 206 obj             := $(objtree)
 207
 208 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 209
 210 export srctree objtree VPATH
 211
 212 # To make sure we do not include .config for any of the *config targets
 213 # catch them early, and hand them over to scripts/kconfig/Makefile
 214 # It is allowed to specify more targets when calling make, including
 215 # mixing *config targets and build targets.
 216 # For example 'make oldconfig all'.
 217 # Detect when mixed targets is specified, and make a second invocation
 218 # of make so .config is not included in this case either (for *config).
 219
 220 version_h := include/generated/uapi/linux/version.h
 221 old_version_h := include/linux/version.h
 222
 223 clean-targets := %clean mrproper cleandocs
 224 no-dot-config-targets := $(clean-targets) \
 225                          cscope gtags TAGS tags help% %docs check% coccicheck \
 226                          $(version_h) headers_% archheaders archscripts \
 227                          kernelversion %src-pkg
 228
 229 config-targets := 0
 230 mixed-targets  := 0
 231 dot-config     := 1
 232
 233 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 234         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 235                 dot-config := 0
 236         endif
 237 endif
 238
 239 ifeq ($(KBUILD_EXTMOD),)
 240         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 241                 config-targets := 1
 242                 ifneq ($(words $(MAKECMDGOALS)),1)
 243                         mixed-targets := 1
 244                 endif
 245         endif
 246 endif
 247
 248 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 249 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 250         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 251                 mixed-targets := 1
 252         endif
 253 endif
 254
 255 # install and modules_install need also be processed one by one
 256 ifneq ($(filter install,$(MAKECMDGOALS)),)
 257         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 258                 mixed-targets := 1
 259         endif
 260 endif
 261
 262 ifeq ($(mixed-targets),1)
 263 # ===========================================================================
 264 # We're called with mixed targets (*config and build targets).
 265 # Handle them one by one.
 266
 267 PHONY += $(MAKECMDGOALS) __build_one_by_one
 268
 269 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 270         @:
 271
 272 __build_one_by_one:
 273         $(Q)set -e; \
 274         for i in $(MAKECMDGOALS); do \
 275                 $(MAKE) -f $(srctree)/Makefile $$i; \
 276         done
 277
 278 else
 279
 280 # We need some generic definitions (do not try to remake the file).
 281 scripts/Kbuild.include: ;
 282 include scripts/Kbuild.include
 283
 284 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 285 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 286 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 287 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 288
 289 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 290 # first, and if a usermode build is happening, the "ARCH=um" on the command
 291 # line overrides the setting of ARCH below.  If a native build is happening,
 292 # then ARCH is assigned, getting whatever value it gets normally, and
 293 # SUBARCH is subsequently ignored.
 294
 295 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 296                                   -e s/sun4u/sparc64/ \
 297                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 298                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 299                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 300                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
 301                                   -e s/riscv.*/riscv/)
 302
 303 # Cross compiling and selecting different set of gcc/bin-utils
 304 # ---------------------------------------------------------------------------
 305 #
 306 # When performing cross compilation for other architectures ARCH shall be set
 307 # to the target architecture. (See arch/* for the possibilities).
 308 # ARCH can be set during invocation of make:
 309 # make ARCH=ia64
 310 # Another way is to have ARCH set in the environment.
 311 # The default ARCH is the host where make is executed.
 312
 313 # CROSS_COMPILE specify the prefix used for all executables used
 314 # during compilation. Only gcc and related bin-utils executables
 315 # are prefixed with $(CROSS_COMPILE).
 316 # CROSS_COMPILE can be set on the command line
 317 # make CROSS_COMPILE=ia64-linux-
 318 # Alternatively CROSS_COMPILE can be set in the environment.
 319 # Default value for CROSS_COMPILE is not to prefix executables
 320 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 321 ARCH            ?= $(SUBARCH)
 322
 323 # Architecture as present in compile.h
 324 UTS_MACHINE     := $(ARCH)
 325 SRCARCH         := $(ARCH)
 326
 327 # Additional ARCH settings for x86
 328 ifeq ($(ARCH),i386)
 329         SRCARCH := x86
 330 endif
 331 ifeq ($(ARCH),x86_64)
 332         SRCARCH := x86
 333 endif
 334
 335 # Additional ARCH settings for sparc
 336 ifeq ($(ARCH),sparc32)
 337        SRCARCH := sparc
 338 endif
 339 ifeq ($(ARCH),sparc64)
 340        SRCARCH := sparc
 341 endif
 342
 343 # Additional ARCH settings for sh
 344 ifeq ($(ARCH),sh64)
 345        SRCARCH := sh
 346 endif
 347
 348 KCONFIG_CONFIG  ?= .config
 349 export KCONFIG_CONFIG
 350
 351 # SHELL used by kbuild
 352 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 353           else if [ -x /bin/bash ]; then echo /bin/bash; \
 354           else echo sh; fi ; fi)
 355
 356 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 357 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 358 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 359
 360 HOSTCC       = gcc
 361 HOSTCXX      = g++
 362 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 363                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 364 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 365 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 366 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 367
 368 # Make variables (CC, etc...)
 369 AS              = $(CROSS_COMPILE)as
 370 LD              = $(CROSS_COMPILE)ld
 371 CC              = $(CROSS_COMPILE)gcc
 372 CPP             = $(CC) -E
 373 AR              = $(CROSS_COMPILE)ar
 374 NM              = $(CROSS_COMPILE)nm
 375 STRIP           = $(CROSS_COMPILE)strip
 376 OBJCOPY         = $(CROSS_COMPILE)objcopy
 377 OBJDUMP         = $(CROSS_COMPILE)objdump
 378 LEX             = flex
 379 YACC            = bison
 380 AWK             = awk
 381 GENKSYMS        = scripts/genksyms/genksyms
 382 INSTALLKERNEL  := installkernel
 383 DEPMOD          = /sbin/depmod
 384 PERL            = perl
 385 PYTHON          = python
 386 PYTHON2         = python2
 387 PYTHON3         = python3
 388 CHECK           = sparse
 389
 390 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 391                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 392 NOSTDINC_FLAGS  =
 393 CFLAGS_MODULE   =
 394 AFLAGS_MODULE   =
 395 LDFLAGS_MODULE  =
 396 CFLAGS_KERNEL   =
 397 AFLAGS_KERNEL   =
 398 LDFLAGS_vmlinux =
 399
 400 # Use USERINCLUDE when you must reference the UAPI directories only.
 401 USERINCLUDE    := \
 402                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 403                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 404                 -I$(srctree)/include/uapi \
 405                 -I$(objtree)/include/generated/uapi \
 406                 -include $(srctree)/include/linux/kconfig.h
 407
 408 # Use LINUXINCLUDE when you must reference the include/ directory.
 409 # Needed to be compatible with the O= option
 410 LINUXINCLUDE    := \
 411                 -I$(srctree)/arch/$(SRCARCH)/include \
 412                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 413                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 414                 -I$(objtree)/include \
 415                 $(USERINCLUDE)
 416
 417 KBUILD_AFLAGS   := -D__ASSEMBLY__
 418 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 419                    -fno-strict-aliasing -fno-common -fshort-wchar \
 420                    -Werror-implicit-function-declaration \
 421                    -Wno-format-security \
 422                    -std=gnu89
 423 KBUILD_CPPFLAGS := -D__KERNEL__
 424 KBUILD_AFLAGS_KERNEL :=
 425 KBUILD_CFLAGS_KERNEL :=
 426 KBUILD_AFLAGS_MODULE  := -DMODULE
 427 KBUILD_CFLAGS_MODULE  := -DMODULE
 428 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 429 LDFLAGS :=
 430 GCC_PLUGINS_CFLAGS :=
 431
 432 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 433 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 434 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 435 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 436
 437 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 438 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 439 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 440 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 441 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 442 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 443 export KBUILD_ARFLAGS
 444
 445 # When compiling out-of-tree modules, put MODVERDIR in the module
 446 # tree rather than in the kernel tree. The kernel tree might
 447 # even be read-only.
 448 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 449
 450 # Files to ignore in find ... statements
 451
 452 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 453                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 454                           -prune -o
 455 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 456                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 457
 458 # ===========================================================================
 459 # Rules shared between *config targets and build targets
 460
 461 # Basic helpers built in scripts/basic/
 462 PHONY += scripts_basic
 463 scripts_basic:
 464         $(Q)$(MAKE) $(build)=scripts/basic
 465         $(Q)rm -f .tmp_quiet_recordmcount
 466
 467 # To avoid any implicit rule to kick in, define an empty command.
 468 scripts/basic/%: scripts_basic ;
 469
 470 PHONY += outputmakefile
 471 # outputmakefile generates a Makefile in the output directory, if using a
 472 # separate output directory. This allows convenient use of make in the
 473 # output directory.
 474 outputmakefile:
 475 ifneq ($(KBUILD_SRC),)
 476         $(Q)ln -fsn $(srctree) source
 477         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 478             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 479 endif
 480
 481 ifeq ($(cc-name),clang)
 482 ifneq ($(CROSS_COMPILE),)
 483 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 484 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 485 endif
 486 ifneq ($(GCC_TOOLCHAIN),)
 487 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 488 endif
 489 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 490 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 491 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 492 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 493 endif
 494
 495 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 496 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 497 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 498 export RETPOLINE_CFLAGS
 499
 500 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 501 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 502
 503 # check for 'asm goto'
 504 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 505   CC_HAVE_ASM_GOTO := 1
 506   KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 507   KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 508 endif
 509
 510 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 511 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 512 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 513 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 514 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 515
 516 ifeq ($(config-targets),1)
 517 # ===========================================================================
 518 # *config targets only - make sure prerequisites are updated, and descend
 519 # in scripts/kconfig to make the *config target
 520
 521 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 522 # KBUILD_DEFCONFIG may point out an alternative default configuration
 523 # used for 'make defconfig'
 524 include arch/$(SRCARCH)/Makefile
 525 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 526
 527 config: scripts_basic outputmakefile FORCE
 528         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 529
 530 %config: scripts_basic outputmakefile FORCE
 531         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 532
 533 else
 534 # ===========================================================================
 535 # Build targets only - this includes vmlinux, arch specific targets, clean
 536 # targets and others. In general all targets except *config targets.
 537
 538 # If building an external module we do not care about the all: rule
 539 # but instead _all depend on modules
 540 PHONY += all
 541 ifeq ($(KBUILD_EXTMOD),)
 542 _all: all
 543 else
 544 _all: modules
 545 endif
 546
 547 # Decide whether to build built-in, modular, or both.
 548 # Normally, just do built-in.
 549
 550 KBUILD_MODULES :=
 551 KBUILD_BUILTIN := 1
 552
 553 # If we have only "make modules", don't compile built-in objects.
 554 # When we're building modules with modversions, we need to consider
 555 # the built-in objects during the descend as well, in order to
 556 # make sure the checksums are up to date before we record them.
 557
 558 ifeq ($(MAKECMDGOALS),modules)
 559   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 560 endif
 561
 562 # If we have "make <whatever> modules", compile modules
 563 # in addition to whatever we do anyway.
 564 # Just "make" or "make all" shall build modules as well
 565
 566 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 567   KBUILD_MODULES := 1
 568 endif
 569
 570 ifeq ($(MAKECMDGOALS),)
 571   KBUILD_MODULES := 1
 572 endif
 573
 574 export KBUILD_MODULES KBUILD_BUILTIN
 575
 576 ifeq ($(KBUILD_EXTMOD),)
 577 # Objects we will link into vmlinux / subdirs we need to visit
 578 init-y          := init/
 579 drivers-y       := drivers/ sound/ firmware/
 580 net-y           := net/
 581 libs-y          := lib/
 582 core-y          := usr/
 583 virt-y          := virt/
 584 endif # KBUILD_EXTMOD
 585
 586 ifeq ($(dot-config),1)
 587 -include include/config/auto.conf
 588 endif
 589
 590 # The all: target is the default when no target is given on the
 591 # command line.
 592 # This allow a user to issue only 'make' to build a kernel including modules
 593 # Defaults to vmlinux, but the arch makefile usually adds further targets
 594 all: vmlinux
 595
 596 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 597         $(call cc-option,-fno-tree-loop-im) \
 598         $(call cc-disable-warning,maybe-uninitialized,)
 599 export CFLAGS_GCOV
 600
 601 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 602 # values of the respective KBUILD_* variables
 603 ARCH_CPPFLAGS :=
 604 ARCH_AFLAGS :=
 605 ARCH_CFLAGS :=
 606 include arch/$(SRCARCH)/Makefile
 607
 608 ifeq ($(dot-config),1)
 609 ifeq ($(KBUILD_EXTMOD),)
 610 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 611 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 612 # because some architectures define CROSS_COMPILE there.
 613 -include include/config/auto.conf.cmd
 614
 615 # To avoid any implicit rule to kick in, define an empty command
 616 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 617
 618 # The actual configuration files used during the build are stored in
 619 # include/generated/ and include/config/. Update them if .config is newer than
 620 # include/config/auto.conf (which mirrors .config).
 621 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 622         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 623 else
 624 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 625 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 626 PHONY += include/config/auto.conf
 627
 628 include/config/auto.conf:
 629         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 630         echo >&2;                                                       \
 631         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 632         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 633         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 634         echo >&2 ;                                                      \
 635         /bin/false)
 636
 637 endif # KBUILD_EXTMOD
 638
 639 else
 640 # Dummy target needed, because used as prerequisite
 641 include/config/auto.conf: ;
 642 endif # $(dot-config)
 643
 644 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 645 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 646 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 647 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 648 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 649
 650 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 651 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 652 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 653 else
 654 ifdef CONFIG_PROFILE_ALL_BRANCHES
 655 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 656 else
 657 KBUILD_CFLAGS   += -O2
 658 endif
 659 endif
 660
 661 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 662                         $(call cc-disable-warning,maybe-uninitialized,))
 663
 664 # Tell gcc to never replace conditional load with a non-conditional one
 665 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 666
 667 include scripts/Makefile.kcov
 668 include scripts/Makefile.gcc-plugins
 669
 670 ifdef CONFIG_READABLE_ASM
 671 # Disable optimizations that make assembler listings hard to read.
 672 # reorder blocks reorders the control in the function
 673 # ipa clone creates specialized cloned functions
 674 # partial inlining inlines only parts of functions
 675 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 676                  $(call cc-option,-fno-ipa-cp-clone,) \
 677                  $(call cc-option,-fno-partial-inlining)
 678 endif
 679
 680 ifneq ($(CONFIG_FRAME_WARN),0)
 681 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 682 endif
 683
 684 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 685 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 686 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 687
 688 KBUILD_CFLAGS += $(stackp-flags-y)
 689
 690 ifeq ($(cc-name),clang)
 691 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 692 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 693 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 694 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 695 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 696 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 697 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 698 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 699 # See modpost pattern 2
 700 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 701 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 702 else
 703
 704 # These warnings generated too much noise in a regular build.
 705 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 706 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 707 endif
 708
 709 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 710 ifdef CONFIG_FRAME_POINTER
 711 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 712 else
 713 # Some targets (ARM with Thumb2, for example), can't be built with frame
 714 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 715 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 716 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 717 # -fomit-frame-pointer with FUNCTION_TRACER.
 718 ifndef CONFIG_FUNCTION_TRACER
 719 KBUILD_CFLAGS   += -fomit-frame-pointer
 720 endif
 721 endif
 722
 723 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 724
 725 ifdef CONFIG_DEBUG_INFO
 726 ifdef CONFIG_DEBUG_INFO_SPLIT
 727 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 728 else
 729 KBUILD_CFLAGS   += -g
 730 endif
 731 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 732 endif
 733 ifdef CONFIG_DEBUG_INFO_DWARF4
 734 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 735 endif
 736
 737 ifdef CONFIG_DEBUG_INFO_REDUCED
 738 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 739                    $(call cc-option,-fno-var-tracking)
 740 endif
 741
 742 ifdef CONFIG_FUNCTION_TRACER
 743 ifndef CC_FLAGS_FTRACE
 744 CC_FLAGS_FTRACE := -pg
 745 endif
 746 export CC_FLAGS_FTRACE
 747 ifdef CONFIG_HAVE_FENTRY
 748 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 749 endif
 750 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 751 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 752 ifdef CONFIG_DYNAMIC_FTRACE
 753         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 754                 BUILD_C_RECORDMCOUNT := y
 755                 export BUILD_C_RECORDMCOUNT
 756         endif
 757 endif
 758 endif
 759
 760 # We trigger additional mismatches with less inlining
 761 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 762 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 763 endif
 764
 765 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 766 KBUILD_CFLAGS_KERNEL    += $(call cc-option,-ffunction-sections,)
 767 KBUILD_CFLAGS_KERNEL    += $(call cc-option,-fdata-sections,)
 768 endif
 769
 770 # arch Makefile may override CC so keep this after arch Makefile is included
 771 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 772
 773 # warn about C99 declaration after statement
 774 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 775
 776 # disable pointer signed / unsigned warnings in gcc 4.0
 777 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 778
 779 # disable invalid "can't wrap" optimizations for signed / pointers
 780 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 781
 782 # clang sets -fmerge-all-constants by default as optimization, but this
 783 # is non-conforming behavior for C and in fact breaks the kernel, so we
 784 # need to disable it here generally.
 785 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 786
 787 # for gcc -fno-merge-all-constants disables everything, but it is fine
 788 # to have actual conforming behavior enabled.
 789 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 790
 791 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 792 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 793
 794 # conserve stack if available
 795 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 796
 797 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 798 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 799
 800 # require functions to have arguments in prototypes, not empty 'int foo()'
 801 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 802
 803 # Prohibit date/time macros, which would make the build non-deterministic
 804 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 805
 806 # enforce correct pointer usage
 807 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 808
 809 # Require designated initializers for all marked structures
 810 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 811
 812 # change __FILE__ to the relative path from the srctree
 813 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 814
 815 # use the deterministic mode of AR if available
 816 KBUILD_ARFLAGS := $(call ar-option,D)
 817
 818 include scripts/Makefile.kasan
 819 include scripts/Makefile.extrawarn
 820 include scripts/Makefile.ubsan
 821
 822 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 823 # last assignments
 824 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 825 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 826 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 827
 828 # Use --build-id when available.
 829 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 830 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 831 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 832
 833 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 834 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 835 endif
 836
 837 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 838 LDFLAGS_vmlinux += $(call ld-option, -X,)
 839 endif
 840
 841 # insure the checker run with the right endianness
 842 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 843
 844 # the checker needs the correct machine size
 845 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 846
 847 # Default kernel image to build when no specific target is given.
 848 # KBUILD_IMAGE may be overruled on the command line or
 849 # set in the environment
 850 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 851 # this default value
 852 export KBUILD_IMAGE ?= vmlinux
 853
 854 #
 855 # INSTALL_PATH specifies where to place the updated kernel and system map
 856 # images. Default is /boot, but you can set it to other values
 857 export  INSTALL_PATH ?= /boot
 858
 859 #
 860 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 861 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 862 # an argument if needed. Otherwise it defaults to the kernel install path
 863 #
 864 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 865
 866 #
 867 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 868 # relocations required by build roots.  This is not defined in the
 869 # makefile but the argument can be passed to make if needed.
 870 #
 871
 872 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 873 export MODLIB
 874
 875 #
 876 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 877 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 878 # the default option --strip-debug will be used.  Otherwise,
 879 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 880
 881 ifdef INSTALL_MOD_STRIP
 882 ifeq ($(INSTALL_MOD_STRIP),1)
 883 mod_strip_cmd = $(STRIP) --strip-debug
 884 else
 885 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 886 endif # INSTALL_MOD_STRIP=1
 887 else
 888 mod_strip_cmd = true
 889 endif # INSTALL_MOD_STRIP
 890 export mod_strip_cmd
 891
 892 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 893 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 894 # or CONFIG_MODULE_COMPRESS_XZ.
 895
 896 mod_compress_cmd = true
 897 ifdef CONFIG_MODULE_COMPRESS
 898   ifdef CONFIG_MODULE_COMPRESS_GZIP
 899     mod_compress_cmd = gzip -n -f
 900   endif # CONFIG_MODULE_COMPRESS_GZIP
 901   ifdef CONFIG_MODULE_COMPRESS_XZ
 902     mod_compress_cmd = xz -f
 903   endif # CONFIG_MODULE_COMPRESS_XZ
 904 endif # CONFIG_MODULE_COMPRESS
 905 export mod_compress_cmd
 906
 907 # Select initial ramdisk compression format, default is gzip(1).
 908 # This shall be used by the dracut(8) tool while creating an initramfs image.
 909 #
 910 INITRD_COMPRESS-y                  := gzip
 911 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 912 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 913 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 914 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 915 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 916 # do not export INITRD_COMPRESS, since we didn't actually
 917 # choose a sane default compression above.
 918 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 919
 920 ifdef CONFIG_MODULE_SIG_ALL
 921 $(eval $(call config_filename,MODULE_SIG_KEY))
 922
 923 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 924 else
 925 mod_sign_cmd = true
 926 endif
 927 export mod_sign_cmd
 928
 929 ifdef CONFIG_STACK_VALIDATION
 930   has_libelf := $(call try-run,\
 931                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 932   ifeq ($(has_libelf),1)
 933     objtool_target := tools/objtool FORCE
 934   else
 935     ifdef CONFIG_UNWINDER_ORC
 936       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 937     else
 938       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 939     endif
 940     SKIP_STACK_VALIDATION := 1
 941     export SKIP_STACK_VALIDATION
 942   endif
 943 endif
 944
 945
 946 ifeq ($(KBUILD_EXTMOD),)
 947 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 948
 949 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 950                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 951                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 952
 953 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 954                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 955
 956 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 957 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 958 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 959 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 960 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 961 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 962 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 963
 964 # Externally visible symbols (used by link-vmlinux.sh)
 965 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 966 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 967 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 968 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 969 export LDFLAGS_vmlinux
 970 # used by scripts/package/Makefile
 971 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 972
 973 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 974
 975 # Recurse until adjust_autoksyms.sh is satisfied
 976 PHONY += autoksyms_recursive
 977 autoksyms_recursive: $(vmlinux-deps)
 978 ifdef CONFIG_TRIM_UNUSED_KSYMS
 979         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 980           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 981 endif
 982
 983 # For the kernel to actually contain only the needed exported symbols,
 984 # we have to build modules as well to determine what those symbols are.
 985 # (this can be evaluated only once include/config/auto.conf has been included)
 986 ifdef CONFIG_TRIM_UNUSED_KSYMS
 987   KBUILD_MODULES := 1
 988 endif
 989
 990 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
 991
 992 $(autoksyms_h):
 993         $(Q)mkdir -p $(dir $@)
 994         $(Q)touch $@
 995
 996 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 997
 998 # Final link of vmlinux with optional arch pass after final link
 999 cmd_link-vmlinux =                                                 \
1000         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1001         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1002
1003 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1004 ifdef CONFIG_HEADERS_CHECK
1005         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1006 endif
1007 ifdef CONFIG_GDB_SCRIPTS
1008         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1009 endif
1010         +$(call if_changed,link-vmlinux)
1011
1012 # Build samples along the rest of the kernel
1013 ifdef CONFIG_SAMPLES
1014 vmlinux-dirs += samples
1015 endif
1016
1017 # The actual objects are generated when descending,
1018 # make sure no implicit rule kicks in
1019 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1020
1021 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1022 # Preset locale variables to speed up the build process. Limit locale
1023 # tweaks to this spot to avoid wrong language settings when running
1024 # make menuconfig etc.
1025 # Error messages still appears in the original language
1026
1027 PHONY += $(vmlinux-dirs)
1028 $(vmlinux-dirs): prepare scripts
1029         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1030
1031 define filechk_kernel.release
1032         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1033 endef
1034
1035 # Store (new) KERNELRELEASE string in include/config/kernel.release
1036 include/config/kernel.release: include/config/auto.conf FORCE
1037         $(call filechk,kernel.release)
1038
1039 # Additional helpers built in scripts/
1040 # Carefully list dependencies so we do not try to build scripts twice
1041 # in parallel
1042 PHONY += scripts
1043 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
1044          asm-generic gcc-plugins $(autoksyms_h)
1045         $(Q)$(MAKE) $(build)=$(@)
1046
1047 # Things we need to do before we recursively start building the kernel
1048 # or the modules are listed in "prepare".
1049 # A multi level approach is used. prepareN is processed before prepareN-1.
1050 # archprepare is used in arch Makefiles and when processed asm symlink,
1051 # version.h and scripts_basic is processed / created.
1052
1053 # Listed in dependency order
1054 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1055
1056 # prepare3 is used to check if we are building in a separate output directory,
1057 # and if so do:
1058 # 1) Check that make has not been executed in the kernel src $(srctree)
1059 prepare3: include/config/kernel.release
1060 ifneq ($(KBUILD_SRC),)
1061         @$(kecho) '  Using $(srctree) as source for kernel'
1062         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1063                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1064                 echo >&2 "  in the '$(srctree)' directory.";\
1065                 /bin/false; \
1066         fi;
1067 endif
1068
1069 # prepare2 creates a makefile if using a separate output directory.
1070 # From this point forward, .config has been reprocessed, so any rules
1071 # that need to depend on updated CONFIG_* values can be checked here.
1072 prepare2: prepare3 outputmakefile asm-generic
1073
1074 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1075                    include/config/auto.conf
1076         $(cmd_crmodverdir)
1077
1078 archprepare: archheaders archscripts prepare1 scripts_basic
1079
1080 prepare0: archprepare gcc-plugins
1081         $(Q)$(MAKE) $(build)=.
1082
1083 # All the preparing..
1084 prepare: prepare0 prepare-objtool
1085
1086 # Support for using generic headers in asm-generic
1087 PHONY += asm-generic uapi-asm-generic
1088 asm-generic: uapi-asm-generic
1089         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1090                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1091 uapi-asm-generic:
1092         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1093                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1094
1095 PHONY += prepare-objtool
1096 prepare-objtool: $(objtool_target)
1097
1098 # Generate some files
1099 # ---------------------------------------------------------------------------
1100
1101 # KERNELRELEASE can change from a few different places, meaning version.h
1102 # needs to be updated, so this check is forced on all builds
1103
1104 uts_len := 64
1105 define filechk_utsrelease.h
1106         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1107           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1108           exit 1;                                                         \
1109         fi;                                                               \
1110         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1111 endef
1112
1113 define filechk_version.h
1114         (echo \#define LINUX_VERSION_CODE $(shell                         \
1115         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1116         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1117 endef
1118
1119 $(version_h): $(srctree)/Makefile FORCE
1120         $(call filechk,version.h)
1121         $(Q)rm -f $(old_version_h)
1122
1123 include/generated/utsrelease.h: include/config/kernel.release FORCE
1124         $(call filechk,utsrelease.h)
1125
1126 PHONY += headerdep
1127 headerdep:
1128         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1129         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1130
1131 # ---------------------------------------------------------------------------
1132 # Kernel headers
1133
1134 #Default location for installed headers
1135 export INSTALL_HDR_PATH = $(objtree)/usr
1136
1137 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1138 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1139
1140 PHONY += archheaders
1141 archheaders:
1142
1143 PHONY += archscripts
1144 archscripts:
1145
1146 PHONY += __headers
1147 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1148         $(Q)$(MAKE) $(build)=scripts build_unifdef
1149
1150 PHONY += headers_install_all
1151 headers_install_all:
1152         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1153
1154 PHONY += headers_install
1155 headers_install: __headers
1156         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1157           $(error Headers not exportable for the $(SRCARCH) architecture))
1158         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1159         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1160
1161 PHONY += headers_check_all
1162 headers_check_all: headers_install_all
1163         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1164
1165 PHONY += headers_check
1166 headers_check: headers_install
1167         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1168         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1169
1170 # ---------------------------------------------------------------------------
1171 # Kernel selftest
1172
1173 PHONY += kselftest
1174 kselftest:
1175         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1176
1177 PHONY += kselftest-clean
1178 kselftest-clean:
1179         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1180
1181 PHONY += kselftest-merge
1182 kselftest-merge:
1183         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1184         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1185                 -m $(objtree)/.config \
1186                 $(srctree)/tools/testing/selftests/*/config
1187         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1188
1189 # ---------------------------------------------------------------------------
1190 # Modules
1191
1192 ifdef CONFIG_MODULES
1193
1194 # By default, build modules as well
1195
1196 all: modules
1197
1198 # Build modules
1199 #
1200 # A module can be listed more than once in obj-m resulting in
1201 # duplicate lines in modules.order files.  Those are removed
1202 # using awk while concatenating to the final file.
1203
1204 PHONY += modules
1205 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1206         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1207         @$(kecho) '  Building modules, stage 2.';
1208         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1209
1210 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1211         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1212
1213 %/modules.builtin: include/config/auto.conf
1214         $(Q)$(MAKE) $(modbuiltin)=$*
1215
1216
1217 # Target to prepare building external modules
1218 PHONY += modules_prepare
1219 modules_prepare: prepare scripts
1220
1221 # Target to install modules
1222 PHONY += modules_install
1223 modules_install: _modinst_ _modinst_post
1224
1225 PHONY += _modinst_
1226 _modinst_:
1227         @rm -rf $(MODLIB)/kernel
1228         @rm -f $(MODLIB)/source
1229         @mkdir -p $(MODLIB)/kernel
1230         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1231         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1232                 rm -f $(MODLIB)/build ; \
1233                 ln -s $(CURDIR) $(MODLIB)/build ; \
1234         fi
1235         @cp -f $(objtree)/modules.order $(MODLIB)/
1236         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1237         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1238
1239 # This depmod is only for convenience to give the initial
1240 # boot a modules.dep even before / is mounted read-write.  However the
1241 # boot script depmod is the master version.
1242 PHONY += _modinst_post
1243 _modinst_post: _modinst_
1244         $(call cmd,depmod)
1245
1246 ifeq ($(CONFIG_MODULE_SIG), y)
1247 PHONY += modules_sign
1248 modules_sign:
1249         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1250 endif
1251
1252 else # CONFIG_MODULES
1253
1254 # Modules not configured
1255 # ---------------------------------------------------------------------------
1256
1257 PHONY += modules modules_install
1258 modules modules_install:
1259         @echo >&2
1260         @echo >&2 "The present kernel configuration has modules disabled."
1261         @echo >&2 "Type 'make config' and enable loadable module support."
1262         @echo >&2 "Then build a kernel with module support enabled."
1263         @echo >&2
1264         @exit 1
1265
1266 endif # CONFIG_MODULES
1267
1268 ###
1269 # Cleaning is done on three levels.
1270 # make clean     Delete most generated files
1271 #                Leave enough to build external modules
1272 # make mrproper  Delete the current configuration, and all generated files
1273 # make distclean Remove editor backup files, patch leftover files and the like
1274
1275 # Directories & files removed with 'make clean'
1276 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1277
1278 # Directories & files removed with 'make mrproper'
1279 MRPROPER_DIRS  += include/config usr/include include/generated          \
1280                   arch/*/include/generated .tmp_objdiff
1281 MRPROPER_FILES += .config .config.old .version \
1282                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1283                   signing_key.pem signing_key.priv signing_key.x509     \
1284                   x509.genkey extra_certificates signing_key.x509.keyid \
1285                   signing_key.x509.signer vmlinux-gdb.py
1286
1287 # clean - Delete most, but leave enough to build external modules
1288 #
1289 clean: rm-dirs  := $(CLEAN_DIRS)
1290 clean: rm-files := $(CLEAN_FILES)
1291 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1292
1293 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1294 $(clean-dirs):
1295         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1296
1297 vmlinuxclean:
1298         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1299         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1300
1301 clean: archclean vmlinuxclean
1302
1303 # mrproper - Delete all generated files, including .config
1304 #
1305 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1306 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1307 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1308
1309 PHONY += $(mrproper-dirs) mrproper archmrproper
1310 $(mrproper-dirs):
1311         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1312
1313 mrproper: clean archmrproper $(mrproper-dirs)
1314         $(call cmd,rmdirs)
1315         $(call cmd,rmfiles)
1316
1317 # distclean
1318 #
1319 PHONY += distclean
1320
1321 distclean: mrproper
1322         @find $(srctree) $(RCS_FIND_IGNORE) \
1323                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1324                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1325                 -o -name 'core' \) \
1326                 -type f -print | xargs rm -f
1327
1328
1329 # Packaging of the kernel to various formats
1330 # ---------------------------------------------------------------------------
1331 # rpm target kept for backward compatibility
1332 package-dir     := scripts/package
1333
1334 %src-pkg: FORCE
1335         $(Q)$(MAKE) $(build)=$(package-dir) $@
1336 %pkg: include/config/kernel.release FORCE
1337         $(Q)$(MAKE) $(build)=$(package-dir) $@
1338 rpm: rpm-pkg
1339         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1340         @echo "           Please use \"rpm-pkg\" instead."
1341
1342
1343 # Brief documentation of the typical targets used
1344 # ---------------------------------------------------------------------------
1345
1346 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1347 boards := $(sort $(notdir $(boards)))
1348 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1349 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1350
1351 PHONY += help
1352 help:
1353         @echo  'Cleaning targets:'
1354         @echo  '  clean           - Remove most generated files but keep the config and'
1355         @echo  '                    enough build support to build external modules'
1356         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1357         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1358         @echo  ''
1359         @echo  'Configuration targets:'
1360         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1361         @echo  ''
1362         @echo  'Other generic targets:'
1363         @echo  '  all             - Build all targets marked with [*]'
1364         @echo  '* vmlinux         - Build the bare kernel'
1365         @echo  '* modules         - Build all modules'
1366         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1367         @echo  '  dir/            - Build all files in dir and below'
1368         @echo  '  dir/file.[ois]  - Build specified target only'
1369         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1370         @echo  '                    (requires compiler support for LLVM assembly generation)'
1371         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1372         @echo  '                    (requires a recent binutils and recent build (System.map))'
1373         @echo  '  dir/file.ko     - Build module including final link'
1374         @echo  '  modules_prepare - Set up for building external modules'
1375         @echo  '  tags/TAGS       - Generate tags file for editors'
1376         @echo  '  cscope          - Generate cscope index'
1377         @echo  '  gtags           - Generate GNU GLOBAL index'
1378         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1379         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1380         @echo  '  image_name      - Output the image name (use with make -s)'
1381         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1382          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1383          echo  ''
1384         @echo  'Static analysers:'
1385         @echo  '  checkstack      - Generate a list of stack hogs'
1386         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1387         @echo  '  versioncheck    - Sanity check on version.h usage'
1388         @echo  '  includecheck    - Check for duplicate included header files'
1389         @echo  '  export_report   - List the usages of all exported symbols'
1390         @echo  '  headers_check   - Sanity check on exported headers'
1391         @echo  '  headerdep       - Detect inclusion cycles in headers'
1392         @echo  '  coccicheck      - Check with Coccinelle'
1393         @echo  ''
1394         @echo  'Kernel selftest:'
1395         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1396         @echo  '                    Build, install, and boot kernel before'
1397         @echo  '                    running kselftest on it'
1398         @echo  '  kselftest-clean - Remove all generated kselftest files'
1399         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1400         @echo  '                    .config.'
1401         @echo  ''
1402         @echo 'Userspace tools targets:'
1403         @echo '  use "make tools/help"'
1404         @echo '  or  "cd tools; make help"'
1405         @echo  ''
1406         @echo  'Kernel packaging:'
1407         @$(MAKE) $(build)=$(package-dir) help
1408         @echo  ''
1409         @echo  'Documentation targets:'
1410         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1411         @echo  ''
1412         @echo  'Architecture specific targets ($(SRCARCH)):'
1413         @$(if $(archhelp),$(archhelp),\
1414                 echo '  No architecture specific help defined for $(SRCARCH)')
1415         @echo  ''
1416         @$(if $(boards), \
1417                 $(foreach b, $(boards), \
1418                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1419                 echo '')
1420         @$(if $(board-dirs), \
1421                 $(foreach b, $(board-dirs), \
1422                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1423                 printf "  %-16s - Show all of the above\\n" help-boards; \
1424                 echo '')
1425
1426         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1427         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1428         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1429         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1430         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1431         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1432         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1433         @echo  '                1: warnings which may be relevant and do not occur too often'
1434         @echo  '                2: warnings which occur quite often but may still be relevant'
1435         @echo  '                3: more obscure warnings, can most likely be ignored'
1436         @echo  '                Multiple levels can be combined with W=12 or W=123'
1437         @echo  ''
1438         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1439         @echo  'For further info see the ./README file'
1440
1441
1442 help-board-dirs := $(addprefix help-,$(board-dirs))
1443
1444 help-boards: $(help-board-dirs)
1445
1446 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1447
1448 $(help-board-dirs): help-%:
1449         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1450         @$(if $(boards-per-dir), \
1451                 $(foreach b, $(boards-per-dir), \
1452                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1453                 echo '')
1454
1455
1456 # Documentation targets
1457 # ---------------------------------------------------------------------------
1458 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1459                linkcheckdocs dochelp refcheckdocs
1460 PHONY += $(DOC_TARGETS)
1461 $(DOC_TARGETS): scripts_basic FORCE
1462         $(Q)$(MAKE) $(build)=Documentation $@
1463
1464 else # KBUILD_EXTMOD
1465
1466 ###
1467 # External module support.
1468 # When building external modules the kernel used as basis is considered
1469 # read-only, and no consistency checks are made and the make
1470 # system is not used on the basis kernel. If updates are required
1471 # in the basis kernel ordinary make commands (without M=...) must
1472 # be used.
1473 #
1474 # The following are the only valid targets when building external
1475 # modules.
1476 # make M=dir clean     Delete all automatically generated files
1477 # make M=dir modules   Make all modules in specified dir
1478 # make M=dir           Same as 'make M=dir modules'
1479 # make M=dir modules_install
1480 #                      Install the modules built in the module directory
1481 #                      Assumes install directory is already created
1482
1483 # We are always building modules
1484 KBUILD_MODULES := 1
1485 PHONY += crmodverdir
1486 crmodverdir:
1487         $(cmd_crmodverdir)
1488
1489 PHONY += $(objtree)/Module.symvers
1490 $(objtree)/Module.symvers:
1491         @test -e $(objtree)/Module.symvers || ( \
1492         echo; \
1493         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1494         echo "           is missing; modules will have no dependencies and modversions."; \
1495         echo )
1496
1497 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1498 PHONY += $(module-dirs) modules
1499 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1500         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1501
1502 modules: $(module-dirs)
1503         @$(kecho) '  Building modules, stage 2.';
1504         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1505
1506 PHONY += modules_install
1507 modules_install: _emodinst_ _emodinst_post
1508
1509 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1510 PHONY += _emodinst_
1511 _emodinst_:
1512         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1513         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1514
1515 PHONY += _emodinst_post
1516 _emodinst_post: _emodinst_
1517         $(call cmd,depmod)
1518
1519 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1520
1521 PHONY += $(clean-dirs) clean
1522 $(clean-dirs):
1523         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1524
1525 clean:  rm-dirs := $(MODVERDIR)
1526 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1527
1528 PHONY += help
1529 help:
1530         @echo  '  Building external modules.'
1531         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1532         @echo  ''
1533         @echo  '  modules         - default target, build the module(s)'
1534         @echo  '  modules_install - install the module'
1535         @echo  '  clean           - remove generated files in module directory only'
1536         @echo  ''
1537
1538 # Dummies...
1539 PHONY += prepare scripts
1540 prepare: ;
1541 scripts: ;
1542 endif # KBUILD_EXTMOD
1543
1544 clean: $(clean-dirs)
1545         $(call cmd,rmdirs)
1546         $(call cmd,rmfiles)
1547         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1548                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1549                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1550                 -o -name '*.dwo' -o -name '*.lst' \
1551                 -o -name '*.su'  \
1552                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1553                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1554                 -o -name '*.asn1.[ch]' \
1555                 -o -name '*.symtypes' -o -name 'modules.order' \
1556                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1557                 -o -name '*.c.[012]*.*' \
1558                 -o -name '*.ll' \
1559                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1560
1561 # Generate tags for editors
1562 # ---------------------------------------------------------------------------
1563 quiet_cmd_tags = GEN     $@
1564       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1565
1566 tags TAGS cscope gtags: FORCE
1567         $(call cmd,tags)
1568
1569 # Scripts to check various things for consistency
1570 # ---------------------------------------------------------------------------
1571
1572 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1573
1574 includecheck:
1575         find $(srctree)/* $(RCS_FIND_IGNORE) \
1576                 -name '*.[hcS]' -type f -print | sort \
1577                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1578
1579 versioncheck:
1580         find $(srctree)/* $(RCS_FIND_IGNORE) \
1581                 -name '*.[hcS]' -type f -print | sort \
1582                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1583
1584 coccicheck:
1585         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1586
1587 namespacecheck:
1588         $(PERL) $(srctree)/scripts/namespace.pl
1589
1590 export_report:
1591         $(PERL) $(srctree)/scripts/export_report.pl
1592
1593 endif #ifeq ($(config-targets),1)
1594 endif #ifeq ($(mixed-targets),1)
1595
1596 PHONY += checkstack kernelrelease kernelversion image_name
1597
1598 # UML needs a little special treatment here.  It wants to use the host
1599 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1600 # else wants $(ARCH), including people doing cross-builds, which means
1601 # that $(SUBARCH) doesn't work here.
1602 ifeq ($(ARCH), um)
1603 CHECKSTACK_ARCH := $(SUBARCH)
1604 else
1605 CHECKSTACK_ARCH := $(ARCH)
1606 endif
1607 checkstack:
1608         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1609         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1610
1611 kernelrelease:
1612         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1613
1614 kernelversion:
1615         @echo $(KERNELVERSION)
1616
1617 image_name:
1618         @echo $(KBUILD_IMAGE)
1619
1620 # Clear a bunch of variables before executing the submake
1621 tools/: FORCE
1622         $(Q)mkdir -p $(objtree)/tools
1623         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1624
1625 tools/%: FORCE
1626         $(Q)mkdir -p $(objtree)/tools
1627         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1628
1629 # Single targets
1630 # ---------------------------------------------------------------------------
1631 # Single targets are compatible with:
1632 # - build with mixed source and output
1633 # - build with separate output dir 'make O=...'
1634 # - external modules
1635 #
1636 #  target-dir => where to store outputfile
1637 #  build-dir  => directory in kernel source tree to use
1638
1639 ifeq ($(KBUILD_EXTMOD),)
1640         build-dir  = $(patsubst %/,%,$(dir $@))
1641         target-dir = $(dir $@)
1642 else
1643         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1644         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1645         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1646 endif
1647
1648 %.s: %.c prepare scripts FORCE
1649         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1650 %.i: %.c prepare scripts FORCE
1651         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1652 %.o: %.c prepare scripts FORCE
1653         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1654 %.lst: %.c prepare scripts FORCE
1655         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1656 %.s: %.S prepare scripts FORCE
1657         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1658 %.o: %.S prepare scripts FORCE
1659         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1660 %.symtypes: %.c prepare scripts FORCE
1661         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1662 %.ll: %.c prepare scripts FORCE
1663         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1664
1665 # Modules
1666 /: prepare scripts FORCE
1667         $(cmd_crmodverdir)
1668         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1669         $(build)=$(build-dir)
1670 # Make sure the latest headers are built for Documentation
1671 Documentation/ samples/: headers_install
1672 %/: prepare scripts FORCE
1673         $(cmd_crmodverdir)
1674         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1675         $(build)=$(build-dir)
1676 %.ko: prepare scripts FORCE
1677         $(cmd_crmodverdir)
1678         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1679         $(build)=$(build-dir) $(@:.ko=.o)
1680         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1681
1682 # FIXME Should go into a make.lib or something
1683 # ===========================================================================
1684
1685 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1686       cmd_rmdirs = rm -rf $(rm-dirs)
1687
1688 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1689       cmd_rmfiles = rm -f $(rm-files)
1690
1691 # Run depmod only if we have System.map and depmod is executable
1692 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1693       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1694                    $(KERNELRELEASE)
1695
1696 # Create temporary dir for module support files
1697 # clean it up only when building all modules
1698 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1699                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1700
1701 # read all saved command lines
1702
1703 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1704
1705 ifneq ($(cmd_files),)
1706   $(cmd_files): ;       # Do not try to update included dependency files
1707   include $(cmd_files)
1708 endif
1709
1710 endif   # skip-makefile
1711
1712 PHONY += FORCE
1713 FORCE:
1714
1715 # Declare the contents of the PHONY variable as phony.  We keep that
1716 # information in a variable so we can use it in if_changed and friends.
1717 .PHONY: $(PHONY)