Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 0
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc4
   6 NAME = Shy Crocodile
   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 # Do not use make's built-in rules and variables
  19 # (this increases performance and avoids hard-to-debug behaviour)
  20 MAKEFLAGS += -rR
  21
  22 # Avoid funny character set dependencies
  23 unexport LC_ALL
  24 LC_COLLATE=C
  25 LC_NUMERIC=C
  26 export LC_COLLATE LC_NUMERIC
  27
  28 # Avoid interference with shell env settings
  29 unexport GREP_OPTIONS
  30
  31 # We are using a recursive build, so we need to do a little thinking
  32 # to get the ordering right.
  33 #
  34 # Most importantly: sub-Makefiles should only ever modify files in
  35 # their own directory. If in some directory we have a dependency on
  36 # a file in another dir (which doesn't happen often, but it's often
  37 # unavoidable when linking the built-in.a targets which finally
  38 # turn into vmlinux), we will call a sub make in that other dir, and
  39 # after that we are sure that everything which is in that other dir
  40 # is now up to date.
  41 #
  42 # The only cases where we need to modify files which have global
  43 # effects are thus separated out and done before the recursive
  44 # descending is started. They are now explicitly listed as the
  45 # prepare rule.
  46
  47 # Beautify output
  48 # ---------------------------------------------------------------------------
  49 #
  50 # Normally, we echo the whole command before executing it. By making
  51 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  52 # $(quiet) to choose other forms of output instead, e.g.
  53 #
  54 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  55 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  56 #
  57 # If $(quiet) is empty, the whole command will be printed.
  58 # If it is set to "quiet_", only the short version will be printed.
  59 # If it is set to "silent_", nothing will be printed at all, since
  60 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  61 #
  62 # A simple variant is to prefix commands with $(Q) - that's useful
  63 # for commands that shall be hidden in non-verbose mode.
  64 #
  65 #       $(Q)ln $@ :<
  66 #
  67 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  68 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  69 #
  70 # To put more focus on warnings, be less verbose as default
  71 # Use 'make V=1' to see the full commands
  72
  73 ifeq ("$(origin V)", "command line")
  74   KBUILD_VERBOSE = $(V)
  75 endif
  76 ifndef KBUILD_VERBOSE
  77   KBUILD_VERBOSE = 0
  78 endif
  79
  80 ifeq ($(KBUILD_VERBOSE),1)
  81   quiet =
  82   Q =
  83 else
  84   quiet=quiet_
  85   Q = @
  86 endif
  87
  88 # If the user is running make -s (silent mode), suppress echoing of
  89 # commands
  90
  91 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  92   quiet=silent_
  93   tools_silent=s
  94 endif
  95
  96 export quiet Q KBUILD_VERBOSE
  97
  98 # kbuild supports saving output files in a separate directory.
  99 # To locate output files in a separate directory two syntaxes are supported.
 100 # In both cases the working directory must be the root of the kernel src.
 101 # 1) O=
 102 # Use "make O=dir/to/store/output/files/"
 103 #
 104 # 2) Set KBUILD_OUTPUT
 105 # Set the environment variable KBUILD_OUTPUT to point to the directory
 106 # where the output files shall be placed.
 107 # export KBUILD_OUTPUT=dir/to/store/output/files/
 108 # make
 109 #
 110 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 111 # variable.
 112
 113 # KBUILD_SRC is not intended to be used by the regular user (for now),
 114 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 115 ifeq ($(KBUILD_SRC),)
 116
 117 # OK, Make called in directory where kernel src resides
 118 # Do we want to locate output files in a separate directory?
 119 ifeq ("$(origin O)", "command line")
 120   KBUILD_OUTPUT := $(O)
 121 endif
 122
 123 # Cancel implicit rules on top Makefile
 124 $(CURDIR)/Makefile Makefile: ;
 125
 126 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 127   $(error main directory cannot contain spaces nor colons)
 128 endif
 129
 130 ifneq ($(KBUILD_OUTPUT),)
 131 # check that the output directory actually exists
 132 saved-output := $(KBUILD_OUTPUT)
 133 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 134                                                                 && pwd)
 135 $(if $(KBUILD_OUTPUT),, \
 136      $(error failed to create output directory "$(saved-output)"))
 137
 138 # Look for make include files relative to root of kernel src
 139 #
 140 # This does not become effective immediately because MAKEFLAGS is re-parsed
 141 # once after the Makefile is read.  It is OK since we are going to invoke
 142 # 'sub-make' below.
 143 MAKEFLAGS += --include-dir=$(CURDIR)
 144
 145 PHONY += $(MAKECMDGOALS) sub-make
 146
 147 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 148         @:
 149
 150 # Invoke a second make in the output directory, passing relevant variables
 151 sub-make:
 152         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 153         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 154
 155 # Leave processing to above invocation of make
 156 skip-makefile := 1
 157 endif # ifneq ($(KBUILD_OUTPUT),)
 158 endif # ifeq ($(KBUILD_SRC),)
 159
 160 # We process the rest of the Makefile if this is the final invocation of make
 161 ifeq ($(skip-makefile),)
 162
 163 # Do not print "Entering directory ...",
 164 # but we want to display it when entering to the output directory
 165 # so that IDEs/editors are able to understand relative filenames.
 166 MAKEFLAGS += --no-print-directory
 167
 168 # Call a source code checker (by default, "sparse") as part of the
 169 # C compilation.
 170 #
 171 # Use 'make C=1' to enable checking of only re-compiled files.
 172 # Use 'make C=2' to enable checking of *all* source files, regardless
 173 # of whether they are re-compiled or not.
 174 #
 175 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 176 # including where to get the "sparse" utility.
 177
 178 ifeq ("$(origin C)", "command line")
 179   KBUILD_CHECKSRC = $(C)
 180 endif
 181 ifndef KBUILD_CHECKSRC
 182   KBUILD_CHECKSRC = 0
 183 endif
 184
 185 # Use make M=dir to specify directory of external module to build
 186 # Old syntax make ... SUBDIRS=$PWD is still supported
 187 # Setting the environment variable KBUILD_EXTMOD take precedence
 188 ifdef SUBDIRS
 189   $(warning ================= WARNING ================)
 190   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 191   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 192   $(warning ==========================================)
 193   KBUILD_EXTMOD ?= $(SUBDIRS)
 194 endif
 195
 196 ifeq ("$(origin M)", "command line")
 197   KBUILD_EXTMOD := $(M)
 198 endif
 199
 200 ifeq ($(KBUILD_SRC),)
 201         # building in the source tree
 202         srctree := .
 203 else
 204         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 205                 # building in a subdirectory of the source tree
 206                 srctree := ..
 207         else
 208                 srctree := $(KBUILD_SRC)
 209         endif
 210 endif
 211
 212 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 213
 214 objtree         := .
 215 src             := $(srctree)
 216 obj             := $(objtree)
 217
 218 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 219
 220 export srctree objtree VPATH
 221
 222 # To make sure we do not include .config for any of the *config targets
 223 # catch them early, and hand them over to scripts/kconfig/Makefile
 224 # It is allowed to specify more targets when calling make, including
 225 # mixing *config targets and build targets.
 226 # For example 'make oldconfig all'.
 227 # Detect when mixed targets is specified, and make a second invocation
 228 # of make so .config is not included in this case either (for *config).
 229
 230 version_h := include/generated/uapi/linux/version.h
 231 old_version_h := include/linux/version.h
 232
 233 clean-targets := %clean mrproper cleandocs
 234 no-dot-config-targets := $(clean-targets) \
 235                          cscope gtags TAGS tags help% %docs check% coccicheck \
 236                          $(version_h) headers_% archheaders archscripts \
 237                          %asm-generic kernelversion %src-pkg
 238 no-sync-config-targets := $(no-dot-config-targets) install %install \
 239                            kernelrelease
 240
 241 config-targets  := 0
 242 mixed-targets   := 0
 243 dot-config      := 1
 244 may-sync-config := 1
 245
 246 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 247         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 248                 dot-config := 0
 249         endif
 250 endif
 251
 252 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 253         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 254                 may-sync-config := 0
 255         endif
 256 endif
 257
 258 ifneq ($(KBUILD_EXTMOD),)
 259         may-sync-config := 0
 260 endif
 261
 262 ifeq ($(KBUILD_EXTMOD),)
 263         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 264                 config-targets := 1
 265                 ifneq ($(words $(MAKECMDGOALS)),1)
 266                         mixed-targets := 1
 267                 endif
 268         endif
 269 endif
 270
 271 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 272 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 273         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 274                 mixed-targets := 1
 275         endif
 276 endif
 277
 278 # install and modules_install need also be processed one by one
 279 ifneq ($(filter install,$(MAKECMDGOALS)),)
 280         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 281                 mixed-targets := 1
 282         endif
 283 endif
 284
 285 ifeq ($(mixed-targets),1)
 286 # ===========================================================================
 287 # We're called with mixed targets (*config and build targets).
 288 # Handle them one by one.
 289
 290 PHONY += $(MAKECMDGOALS) __build_one_by_one
 291
 292 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 293         @:
 294
 295 __build_one_by_one:
 296         $(Q)set -e; \
 297         for i in $(MAKECMDGOALS); do \
 298                 $(MAKE) -f $(srctree)/Makefile $$i; \
 299         done
 300
 301 else
 302
 303 # We need some generic definitions (do not try to remake the file).
 304 scripts/Kbuild.include: ;
 305 include scripts/Kbuild.include
 306
 307 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 308 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 309 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 310 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 311
 312 include scripts/subarch.include
 313
 314 # Cross compiling and selecting different set of gcc/bin-utils
 315 # ---------------------------------------------------------------------------
 316 #
 317 # When performing cross compilation for other architectures ARCH shall be set
 318 # to the target architecture. (See arch/* for the possibilities).
 319 # ARCH can be set during invocation of make:
 320 # make ARCH=ia64
 321 # Another way is to have ARCH set in the environment.
 322 # The default ARCH is the host where make is executed.
 323
 324 # CROSS_COMPILE specify the prefix used for all executables used
 325 # during compilation. Only gcc and related bin-utils executables
 326 # are prefixed with $(CROSS_COMPILE).
 327 # CROSS_COMPILE can be set on the command line
 328 # make CROSS_COMPILE=ia64-linux-
 329 # Alternatively CROSS_COMPILE can be set in the environment.
 330 # Default value for CROSS_COMPILE is not to prefix executables
 331 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 332 ARCH            ?= $(SUBARCH)
 333
 334 # Architecture as present in compile.h
 335 UTS_MACHINE     := $(ARCH)
 336 SRCARCH         := $(ARCH)
 337
 338 # Additional ARCH settings for x86
 339 ifeq ($(ARCH),i386)
 340         SRCARCH := x86
 341 endif
 342 ifeq ($(ARCH),x86_64)
 343         SRCARCH := x86
 344 endif
 345
 346 # Additional ARCH settings for sparc
 347 ifeq ($(ARCH),sparc32)
 348        SRCARCH := sparc
 349 endif
 350 ifeq ($(ARCH),sparc64)
 351        SRCARCH := sparc
 352 endif
 353
 354 # Additional ARCH settings for sh
 355 ifeq ($(ARCH),sh64)
 356        SRCARCH := sh
 357 endif
 358
 359 KCONFIG_CONFIG  ?= .config
 360 export KCONFIG_CONFIG
 361
 362 # SHELL used by kbuild
 363 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 364           else if [ -x /bin/bash ]; then echo /bin/bash; \
 365           else echo sh; fi ; fi)
 366
 367 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 368 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 369 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 370
 371 HOSTCC       = gcc
 372 HOSTCXX      = g++
 373 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 374                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 375                 $(HOSTCFLAGS)
 376 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 377 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 378 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 379
 380 # Make variables (CC, etc...)
 381 AS              = $(CROSS_COMPILE)as
 382 LD              = $(CROSS_COMPILE)ld
 383 CC              = $(CROSS_COMPILE)gcc
 384 CPP             = $(CC) -E
 385 AR              = $(CROSS_COMPILE)ar
 386 NM              = $(CROSS_COMPILE)nm
 387 STRIP           = $(CROSS_COMPILE)strip
 388 OBJCOPY         = $(CROSS_COMPILE)objcopy
 389 OBJDUMP         = $(CROSS_COMPILE)objdump
 390 LEX             = flex
 391 YACC            = bison
 392 AWK             = awk
 393 INSTALLKERNEL  := installkernel
 394 DEPMOD          = /sbin/depmod
 395 PERL            = perl
 396 PYTHON          = python
 397 PYTHON2         = python2
 398 PYTHON3         = python3
 399 CHECK           = sparse
 400
 401 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 402                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 403 NOSTDINC_FLAGS  =
 404 CFLAGS_MODULE   =
 405 AFLAGS_MODULE   =
 406 LDFLAGS_MODULE  =
 407 CFLAGS_KERNEL   =
 408 AFLAGS_KERNEL   =
 409 LDFLAGS_vmlinux =
 410
 411 # Use USERINCLUDE when you must reference the UAPI directories only.
 412 USERINCLUDE    := \
 413                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 414                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 415                 -I$(srctree)/include/uapi \
 416                 -I$(objtree)/include/generated/uapi \
 417                 -include $(srctree)/include/linux/kconfig.h
 418
 419 # Use LINUXINCLUDE when you must reference the include/ directory.
 420 # Needed to be compatible with the O= option
 421 LINUXINCLUDE    := \
 422                 -I$(srctree)/arch/$(SRCARCH)/include \
 423                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 424                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 425                 -I$(objtree)/include \
 426                 $(USERINCLUDE)
 427
 428 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 429 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 430                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 431                    -Werror-implicit-function-declaration -Werror=implicit-int \
 432                    -Wno-format-security \
 433                    -std=gnu89
 434 KBUILD_CPPFLAGS := -D__KERNEL__
 435 KBUILD_AFLAGS_KERNEL :=
 436 KBUILD_CFLAGS_KERNEL :=
 437 KBUILD_AFLAGS_MODULE  := -DMODULE
 438 KBUILD_CFLAGS_MODULE  := -DMODULE
 439 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 440 KBUILD_LDFLAGS :=
 441 GCC_PLUGINS_CFLAGS :=
 442
 443 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 444 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 445 export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 446 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 447
 448 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 449 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 450 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 451 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 452 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 453 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 454 export KBUILD_ARFLAGS
 455
 456 # When compiling out-of-tree modules, put MODVERDIR in the module
 457 # tree rather than in the kernel tree. The kernel tree might
 458 # even be read-only.
 459 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 460
 461 # Files to ignore in find ... statements
 462
 463 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 464                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 465                           -prune -o
 466 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 467                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 468
 469 # ===========================================================================
 470 # Rules shared between *config targets and build targets
 471
 472 # Basic helpers built in scripts/basic/
 473 PHONY += scripts_basic
 474 scripts_basic:
 475         $(Q)$(MAKE) $(build)=scripts/basic
 476         $(Q)rm -f .tmp_quiet_recordmcount
 477
 478 # To avoid any implicit rule to kick in, define an empty command.
 479 scripts/basic/%: scripts_basic ;
 480
 481 PHONY += outputmakefile
 482 # outputmakefile generates a Makefile in the output directory, if using a
 483 # separate output directory. This allows convenient use of make in the
 484 # output directory.
 485 # At the same time when output Makefile generated, generate .gitignore to
 486 # ignore whole output directory
 487 outputmakefile:
 488 ifneq ($(KBUILD_SRC),)
 489         $(Q)ln -fsn $(srctree) source
 490         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 491         $(Q){ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 492 endif
 493
 494 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 495 ifneq ($(CROSS_COMPILE),)
 496 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 497 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 498 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 499 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 500 endif
 501 ifneq ($(GCC_TOOLCHAIN),)
 502 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 503 endif
 504 CLANG_FLAGS     += -no-integrated-as
 505 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 506 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 507 export CLANG_FLAGS
 508 endif
 509
 510 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 511 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 512 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 513 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 514 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 515 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 516 export RETPOLINE_CFLAGS
 517 export RETPOLINE_VDSO_CFLAGS
 518
 519 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 520 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 521 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 522 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 523 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 524
 525 ifeq ($(config-targets),1)
 526 # ===========================================================================
 527 # *config targets only - make sure prerequisites are updated, and descend
 528 # in scripts/kconfig to make the *config target
 529
 530 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 531 # KBUILD_DEFCONFIG may point out an alternative default configuration
 532 # used for 'make defconfig'
 533 include arch/$(SRCARCH)/Makefile
 534 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 535
 536 config: scripts_basic outputmakefile FORCE
 537         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 538
 539 %config: scripts_basic outputmakefile FORCE
 540         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 541
 542 else
 543 # ===========================================================================
 544 # Build targets only - this includes vmlinux, arch specific targets, clean
 545 # targets and others. In general all targets except *config targets.
 546
 547 # If building an external module we do not care about the all: rule
 548 # but instead _all depend on modules
 549 PHONY += all
 550 ifeq ($(KBUILD_EXTMOD),)
 551 _all: all
 552 else
 553 _all: modules
 554 endif
 555
 556 # Decide whether to build built-in, modular, or both.
 557 # Normally, just do built-in.
 558
 559 KBUILD_MODULES :=
 560 KBUILD_BUILTIN := 1
 561
 562 # If we have only "make modules", don't compile built-in objects.
 563 # When we're building modules with modversions, we need to consider
 564 # the built-in objects during the descend as well, in order to
 565 # make sure the checksums are up to date before we record them.
 566
 567 ifeq ($(MAKECMDGOALS),modules)
 568   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 569 endif
 570
 571 # If we have "make <whatever> modules", compile modules
 572 # in addition to whatever we do anyway.
 573 # Just "make" or "make all" shall build modules as well
 574
 575 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 576   KBUILD_MODULES := 1
 577 endif
 578
 579 ifeq ($(MAKECMDGOALS),)
 580   KBUILD_MODULES := 1
 581 endif
 582
 583 export KBUILD_MODULES KBUILD_BUILTIN
 584
 585 ifeq ($(KBUILD_EXTMOD),)
 586 # Objects we will link into vmlinux / subdirs we need to visit
 587 init-y          := init/
 588 drivers-y       := drivers/ sound/ firmware/
 589 net-y           := net/
 590 libs-y          := lib/
 591 core-y          := usr/
 592 virt-y          := virt/
 593 endif # KBUILD_EXTMOD
 594
 595 ifeq ($(dot-config),1)
 596 include include/config/auto.conf
 597 endif
 598
 599 # The all: target is the default when no target is given on the
 600 # command line.
 601 # This allow a user to issue only 'make' to build a kernel including modules
 602 # Defaults to vmlinux, but the arch makefile usually adds further targets
 603 all: vmlinux
 604
 605 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 606         $(call cc-option,-fno-tree-loop-im) \
 607         $(call cc-disable-warning,maybe-uninitialized,)
 608 export CFLAGS_GCOV
 609
 610 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 611 ifdef CONFIG_FUNCTION_TRACER
 612   CC_FLAGS_FTRACE := -pg
 613 endif
 614
 615 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 616 # values of the respective KBUILD_* variables
 617 ARCH_CPPFLAGS :=
 618 ARCH_AFLAGS :=
 619 ARCH_CFLAGS :=
 620 include arch/$(SRCARCH)/Makefile
 621
 622 ifeq ($(dot-config),1)
 623 ifeq ($(may-sync-config),1)
 624 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 625 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 626 # because some architectures define CROSS_COMPILE there.
 627 -include include/config/auto.conf.cmd
 628
 629 # To avoid any implicit rule to kick in, define an empty command
 630 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 631
 632 # The actual configuration files used during the build are stored in
 633 # include/generated/ and include/config/. Update them if .config is newer than
 634 # include/config/auto.conf (which mirrors .config).
 635 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 636         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 637 else
 638 # External modules and some install targets need include/generated/autoconf.h
 639 # and include/config/auto.conf but do not care if they are up-to-date.
 640 # Use auto.conf to trigger the test
 641 PHONY += include/config/auto.conf
 642
 643 include/config/auto.conf:
 644         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 645         echo >&2;                                                       \
 646         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 647         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 648         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 649         echo >&2 ;                                                      \
 650         /bin/false)
 651
 652 endif # may-sync-config
 653 endif # $(dot-config)
 654
 655 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 656 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 657 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 658 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 659 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 660
 661 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 662 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 663 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 664 else
 665 ifdef CONFIG_PROFILE_ALL_BRANCHES
 666 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 667 else
 668 KBUILD_CFLAGS   += -O2
 669 endif
 670 endif
 671
 672 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 673                         $(call cc-disable-warning,maybe-uninitialized,))
 674
 675 # Tell gcc to never replace conditional load with a non-conditional one
 676 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 677
 678 include scripts/Makefile.kcov
 679 include scripts/Makefile.gcc-plugins
 680
 681 ifdef CONFIG_READABLE_ASM
 682 # Disable optimizations that make assembler listings hard to read.
 683 # reorder blocks reorders the control in the function
 684 # ipa clone creates specialized cloned functions
 685 # partial inlining inlines only parts of functions
 686 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 687                  $(call cc-option,-fno-ipa-cp-clone,) \
 688                  $(call cc-option,-fno-partial-inlining)
 689 endif
 690
 691 ifneq ($(CONFIG_FRAME_WARN),0)
 692 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 693 endif
 694
 695 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 696 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 697 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 698
 699 KBUILD_CFLAGS += $(stackp-flags-y)
 700
 701 ifdef CONFIG_CC_IS_CLANG
 702 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 703 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 704 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 705 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 706 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 707 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 708 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 709 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 710 # See modpost pattern 2
 711 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 712 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 713 else
 714
 715 # These warnings generated too much noise in a regular build.
 716 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 717 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 718 endif
 719
 720 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 721 ifdef CONFIG_FRAME_POINTER
 722 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 723 else
 724 # Some targets (ARM with Thumb2, for example), can't be built with frame
 725 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 726 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 727 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 728 # -fomit-frame-pointer with FUNCTION_TRACER.
 729 ifndef CONFIG_FUNCTION_TRACER
 730 KBUILD_CFLAGS   += -fomit-frame-pointer
 731 endif
 732 endif
 733
 734 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 735
 736 ifdef CONFIG_DEBUG_INFO
 737 ifdef CONFIG_DEBUG_INFO_SPLIT
 738 DEBUG_CFLAGS    += $(call cc-option, -gsplit-dwarf, -g)
 739 else
 740 DEBUG_CFLAGS    += -g
 741 endif
 742 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 743 endif
 744 ifdef CONFIG_DEBUG_INFO_DWARF4
 745 DEBUG_CFLAGS    += $(call cc-option, -gdwarf-4,)
 746 endif
 747
 748 ifdef CONFIG_DEBUG_INFO_REDUCED
 749 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 750                    $(call cc-option,-fno-var-tracking)
 751 endif
 752
 753 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 754 export DEBUG_CFLAGS
 755
 756 ifdef CONFIG_FUNCTION_TRACER
 757 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 758   # gcc 5 supports generating the mcount tables directly
 759   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 760     CC_FLAGS_FTRACE     += -mrecord-mcount
 761     export CC_USING_RECORD_MCOUNT := 1
 762   endif
 763   ifdef CONFIG_HAVE_NOP_MCOUNT
 764     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 765       CC_FLAGS_FTRACE   += -mnop-mcount
 766       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 767     endif
 768   endif
 769 endif
 770 ifdef CONFIG_HAVE_FENTRY
 771   ifeq ($(call cc-option-yn, -mfentry),y)
 772     CC_FLAGS_FTRACE     += -mfentry
 773     CC_FLAGS_USING      += -DCC_USING_FENTRY
 774   endif
 775 endif
 776 export CC_FLAGS_FTRACE
 777 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 778 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 779 ifdef CONFIG_DYNAMIC_FTRACE
 780         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 781                 BUILD_C_RECORDMCOUNT := y
 782                 export BUILD_C_RECORDMCOUNT
 783         endif
 784 endif
 785 endif
 786
 787 # We trigger additional mismatches with less inlining
 788 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 789 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 790 endif
 791
 792 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 793 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 794 LDFLAGS_vmlinux += --gc-sections
 795 endif
 796
 797 # arch Makefile may override CC so keep this after arch Makefile is included
 798 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 799
 800 # warn about C99 declaration after statement
 801 KBUILD_CFLAGS += -Wdeclaration-after-statement
 802
 803 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 804 KBUILD_CFLAGS += $(call cc-option,-Wvla)
 805
 806 # disable pointer signed / unsigned warnings in gcc 4.0
 807 KBUILD_CFLAGS += -Wno-pointer-sign
 808
 809 # disable stringop warnings in gcc 8+
 810 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 811
 812 # disable invalid "can't wrap" optimizations for signed / pointers
 813 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 814
 815 # clang sets -fmerge-all-constants by default as optimization, but this
 816 # is non-conforming behavior for C and in fact breaks the kernel, so we
 817 # need to disable it here generally.
 818 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 819
 820 # for gcc -fno-merge-all-constants disables everything, but it is fine
 821 # to have actual conforming behavior enabled.
 822 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 823
 824 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 825 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 826
 827 # conserve stack if available
 828 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 829
 830 # Prohibit date/time macros, which would make the build non-deterministic
 831 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 832
 833 # enforce correct pointer usage
 834 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 835
 836 # Require designated initializers for all marked structures
 837 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 838
 839 # change __FILE__ to the relative path from the srctree
 840 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 841
 842 # use the deterministic mode of AR if available
 843 KBUILD_ARFLAGS := $(call ar-option,D)
 844
 845 include scripts/Makefile.kasan
 846 include scripts/Makefile.extrawarn
 847 include scripts/Makefile.ubsan
 848
 849 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 850 # last assignments
 851 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 852 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 853 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 854
 855 # Use --build-id when available.
 856 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 857 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 858 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 859
 860 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 861 LDFLAGS_vmlinux += $(call ld-option, -X,)
 862 endif
 863
 864 # insure the checker run with the right endianness
 865 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 866
 867 # the checker needs the correct machine size
 868 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 869
 870 # Default kernel image to build when no specific target is given.
 871 # KBUILD_IMAGE may be overruled on the command line or
 872 # set in the environment
 873 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 874 # this default value
 875 export KBUILD_IMAGE ?= vmlinux
 876
 877 #
 878 # INSTALL_PATH specifies where to place the updated kernel and system map
 879 # images. Default is /boot, but you can set it to other values
 880 export  INSTALL_PATH ?= /boot
 881
 882 #
 883 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 884 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 885 # an argument if needed. Otherwise it defaults to the kernel install path
 886 #
 887 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 888
 889 #
 890 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 891 # relocations required by build roots.  This is not defined in the
 892 # makefile but the argument can be passed to make if needed.
 893 #
 894
 895 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 896 export MODLIB
 897
 898 #
 899 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 900 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 901 # the default option --strip-debug will be used.  Otherwise,
 902 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 903
 904 ifdef INSTALL_MOD_STRIP
 905 ifeq ($(INSTALL_MOD_STRIP),1)
 906 mod_strip_cmd = $(STRIP) --strip-debug
 907 else
 908 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 909 endif # INSTALL_MOD_STRIP=1
 910 else
 911 mod_strip_cmd = true
 912 endif # INSTALL_MOD_STRIP
 913 export mod_strip_cmd
 914
 915 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 916 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 917 # or CONFIG_MODULE_COMPRESS_XZ.
 918
 919 mod_compress_cmd = true
 920 ifdef CONFIG_MODULE_COMPRESS
 921   ifdef CONFIG_MODULE_COMPRESS_GZIP
 922     mod_compress_cmd = gzip -n -f
 923   endif # CONFIG_MODULE_COMPRESS_GZIP
 924   ifdef CONFIG_MODULE_COMPRESS_XZ
 925     mod_compress_cmd = xz -f
 926   endif # CONFIG_MODULE_COMPRESS_XZ
 927 endif # CONFIG_MODULE_COMPRESS
 928 export mod_compress_cmd
 929
 930 # Select initial ramdisk compression format, default is gzip(1).
 931 # This shall be used by the dracut(8) tool while creating an initramfs image.
 932 #
 933 INITRD_COMPRESS-y                  := gzip
 934 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 935 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 936 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 937 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 938 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 939 # do not export INITRD_COMPRESS, since we didn't actually
 940 # choose a sane default compression above.
 941 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 942
 943 ifdef CONFIG_MODULE_SIG_ALL
 944 $(eval $(call config_filename,MODULE_SIG_KEY))
 945
 946 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 947 else
 948 mod_sign_cmd = true
 949 endif
 950 export mod_sign_cmd
 951
 952 ifdef CONFIG_STACK_VALIDATION
 953   has_libelf := $(call try-run,\
 954                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 955   ifeq ($(has_libelf),1)
 956     objtool_target := tools/objtool FORCE
 957   else
 958     SKIP_STACK_VALIDATION := 1
 959     export SKIP_STACK_VALIDATION
 960   endif
 961 endif
 962
 963 PHONY += prepare0
 964
 965 ifeq ($(KBUILD_EXTMOD),)
 966 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 967
 968 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 969                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 970                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 971
 972 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 973                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 974
 975 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 976 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 977 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 978 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 979 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 980 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 981 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 982
 983 # Externally visible symbols (used by link-vmlinux.sh)
 984 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
 985                               $(drivers-y) $(net-y) $(virt-y)
 986 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 987 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 988 export LDFLAGS_vmlinux
 989 # used by scripts/package/Makefile
 990 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 991
 992 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
 993
 994 # Recurse until adjust_autoksyms.sh is satisfied
 995 PHONY += autoksyms_recursive
 996 autoksyms_recursive: $(vmlinux-deps)
 997 ifdef CONFIG_TRIM_UNUSED_KSYMS
 998         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 999           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1000 endif
1001
1002 # For the kernel to actually contain only the needed exported symbols,
1003 # we have to build modules as well to determine what those symbols are.
1004 # (this can be evaluated only once include/config/auto.conf has been included)
1005 ifdef CONFIG_TRIM_UNUSED_KSYMS
1006   KBUILD_MODULES := 1
1007 endif
1008
1009 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1010
1011 $(autoksyms_h):
1012         $(Q)mkdir -p $(dir $@)
1013         $(Q)touch $@
1014
1015 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1016
1017 # Final link of vmlinux with optional arch pass after final link
1018 cmd_link-vmlinux =                                                 \
1019         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1020         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1021
1022 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1023         +$(call if_changed,link-vmlinux)
1024
1025 targets := vmlinux
1026
1027 # Build samples along the rest of the kernel. This needs headers_install.
1028 ifdef CONFIG_SAMPLES
1029 vmlinux-dirs += samples
1030 samples: headers_install
1031 endif
1032
1033 # The actual objects are generated when descending,
1034 # make sure no implicit rule kicks in
1035 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1036
1037 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1038 # Preset locale variables to speed up the build process. Limit locale
1039 # tweaks to this spot to avoid wrong language settings when running
1040 # make menuconfig etc.
1041 # Error messages still appears in the original language
1042
1043 PHONY += $(vmlinux-dirs)
1044 $(vmlinux-dirs): prepare
1045         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1046
1047 filechk_kernel.release = \
1048         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1049
1050 # Store (new) KERNELRELEASE string in include/config/kernel.release
1051 include/config/kernel.release: $(srctree)/Makefile FORCE
1052         $(call filechk,kernel.release)
1053
1054 # Additional helpers built in scripts/
1055 # Carefully list dependencies so we do not try to build scripts twice
1056 # in parallel
1057 PHONY += scripts
1058 scripts: scripts_basic scripts_dtc
1059         $(Q)$(MAKE) $(build)=$(@)
1060
1061 # Things we need to do before we recursively start building the kernel
1062 # or the modules are listed in "prepare".
1063 # A multi level approach is used. prepareN is processed before prepareN-1.
1064 # archprepare is used in arch Makefiles and when processed asm symlink,
1065 # version.h and scripts_basic is processed / created.
1066
1067 PHONY += prepare archprepare prepare1 prepare3
1068
1069 # prepare3 is used to check if we are building in a separate output directory,
1070 # and if so do:
1071 # 1) Check that make has not been executed in the kernel src $(srctree)
1072 prepare3: include/config/kernel.release
1073 ifneq ($(KBUILD_SRC),)
1074         @$(kecho) '  Using $(srctree) as source for kernel'
1075         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1076                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1077                 echo >&2 "  in the '$(srctree)' directory.";\
1078                 /bin/false; \
1079         fi;
1080 endif
1081
1082 prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
1083                                                 include/generated/utsrelease.h
1084         $(cmd_crmodverdir)
1085
1086 archprepare: archheaders archscripts prepare1 scripts
1087
1088 prepare0: archprepare
1089         $(Q)$(MAKE) $(build)=scripts/mod
1090         $(Q)$(MAKE) $(build)=.
1091
1092 # All the preparing..
1093 prepare: prepare0 prepare-objtool
1094
1095 # Support for using generic headers in asm-generic
1096 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1097
1098 PHONY += asm-generic uapi-asm-generic
1099 asm-generic: uapi-asm-generic
1100         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm
1101 uapi-asm-generic:
1102         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm
1103
1104 PHONY += prepare-objtool
1105 prepare-objtool: $(objtool_target)
1106 ifeq ($(SKIP_STACK_VALIDATION),1)
1107 ifdef CONFIG_UNWINDER_ORC
1108         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1109         @false
1110 else
1111         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1112 endif
1113 endif
1114
1115 # Generate some files
1116 # ---------------------------------------------------------------------------
1117
1118 # KERNELRELEASE can change from a few different places, meaning version.h
1119 # needs to be updated, so this check is forced on all builds
1120
1121 uts_len := 64
1122 define filechk_utsrelease.h
1123         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1124           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1125           exit 1;                                                         \
1126         fi;                                                               \
1127         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1128 endef
1129
1130 define filechk_version.h
1131         echo \#define LINUX_VERSION_CODE $(shell                         \
1132         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1133         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1134 endef
1135
1136 $(version_h): FORCE
1137         $(call filechk,version.h)
1138         $(Q)rm -f $(old_version_h)
1139
1140 include/generated/utsrelease.h: include/config/kernel.release FORCE
1141         $(call filechk,utsrelease.h)
1142
1143 PHONY += headerdep
1144 headerdep:
1145         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1146         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1147
1148 # ---------------------------------------------------------------------------
1149 # Kernel headers
1150
1151 #Default location for installed headers
1152 export INSTALL_HDR_PATH = $(objtree)/usr
1153
1154 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1155 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1156
1157 PHONY += archheaders archscripts
1158
1159 PHONY += __headers
1160 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1161         $(Q)$(MAKE) $(build)=scripts build_unifdef
1162
1163 PHONY += headers_install_all
1164 headers_install_all:
1165         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1166
1167 PHONY += headers_install
1168 headers_install: __headers
1169         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1170           $(error Headers not exportable for the $(SRCARCH) architecture))
1171         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1172         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1173
1174 PHONY += headers_check_all
1175 headers_check_all: headers_install_all
1176         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1177
1178 PHONY += headers_check
1179 headers_check: headers_install
1180         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1181         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1182
1183 ifdef CONFIG_HEADERS_CHECK
1184 all: headers_check
1185 endif
1186
1187 # ---------------------------------------------------------------------------
1188 # Kernel selftest
1189
1190 PHONY += kselftest
1191 kselftest:
1192         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1193
1194 PHONY += kselftest-clean
1195 kselftest-clean:
1196         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1197
1198 PHONY += kselftest-merge
1199 kselftest-merge:
1200         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1201         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1202                 -m $(objtree)/.config \
1203                 $(srctree)/tools/testing/selftests/*/config
1204         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1205
1206 # ---------------------------------------------------------------------------
1207 # Devicetree files
1208
1209 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1210 dtstree := arch/$(SRCARCH)/boot/dts
1211 endif
1212
1213 ifneq ($(dtstree),)
1214
1215 %.dtb: prepare3 scripts_dtc
1216         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1217
1218 PHONY += dtbs dtbs_install dt_binding_check
1219 dtbs dtbs_check: prepare3 scripts_dtc
1220         $(Q)$(MAKE) $(build)=$(dtstree)
1221
1222 dtbs_check: export CHECK_DTBS=1
1223 dtbs_check: dt_binding_check
1224
1225 dtbs_install:
1226         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1227
1228 ifdef CONFIG_OF_EARLY_FLATTREE
1229 all: dtbs
1230 endif
1231
1232 endif
1233
1234 PHONY += scripts_dtc
1235 scripts_dtc: scripts_basic
1236         $(Q)$(MAKE) $(build)=scripts/dtc
1237
1238 dt_binding_check: scripts_dtc
1239         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1240
1241 # ---------------------------------------------------------------------------
1242 # Modules
1243
1244 ifdef CONFIG_MODULES
1245
1246 # By default, build modules as well
1247
1248 all: modules
1249
1250 # Build modules
1251 #
1252 # A module can be listed more than once in obj-m resulting in
1253 # duplicate lines in modules.order files.  Those are removed
1254 # using awk while concatenating to the final file.
1255
1256 PHONY += modules
1257 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1258         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1259         @$(kecho) '  Building modules, stage 2.';
1260         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1261
1262 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1263         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1264
1265 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1266         $(Q)$(MAKE) $(modbuiltin)=$*
1267
1268
1269 # Target to prepare building external modules
1270 PHONY += modules_prepare
1271 modules_prepare: prepare
1272
1273 # Target to install modules
1274 PHONY += modules_install
1275 modules_install: _modinst_ _modinst_post
1276
1277 PHONY += _modinst_
1278 _modinst_:
1279         @rm -rf $(MODLIB)/kernel
1280         @rm -f $(MODLIB)/source
1281         @mkdir -p $(MODLIB)/kernel
1282         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1283         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1284                 rm -f $(MODLIB)/build ; \
1285                 ln -s $(CURDIR) $(MODLIB)/build ; \
1286         fi
1287         @cp -f $(objtree)/modules.order $(MODLIB)/
1288         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1289         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1290
1291 # This depmod is only for convenience to give the initial
1292 # boot a modules.dep even before / is mounted read-write.  However the
1293 # boot script depmod is the master version.
1294 PHONY += _modinst_post
1295 _modinst_post: _modinst_
1296         $(call cmd,depmod)
1297
1298 ifeq ($(CONFIG_MODULE_SIG), y)
1299 PHONY += modules_sign
1300 modules_sign:
1301         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1302 endif
1303
1304 else # CONFIG_MODULES
1305
1306 # Modules not configured
1307 # ---------------------------------------------------------------------------
1308
1309 PHONY += modules modules_install
1310 modules modules_install:
1311         @echo >&2
1312         @echo >&2 "The present kernel configuration has modules disabled."
1313         @echo >&2 "Type 'make config' and enable loadable module support."
1314         @echo >&2 "Then build a kernel with module support enabled."
1315         @echo >&2
1316         @exit 1
1317
1318 endif # CONFIG_MODULES
1319
1320 ###
1321 # Cleaning is done on three levels.
1322 # make clean     Delete most generated files
1323 #                Leave enough to build external modules
1324 # make mrproper  Delete the current configuration, and all generated files
1325 # make distclean Remove editor backup files, patch leftover files and the like
1326
1327 # Directories & files removed with 'make clean'
1328 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1329
1330 # Directories & files removed with 'make mrproper'
1331 MRPROPER_DIRS  += include/config usr/include include/generated          \
1332                   arch/*/include/generated .tmp_objdiff
1333 MRPROPER_FILES += .config .config.old .version \
1334                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1335                   signing_key.pem signing_key.priv signing_key.x509     \
1336                   x509.genkey extra_certificates signing_key.x509.keyid \
1337                   signing_key.x509.signer vmlinux-gdb.py
1338
1339 # clean - Delete most, but leave enough to build external modules
1340 #
1341 clean: rm-dirs  := $(CLEAN_DIRS)
1342 clean: rm-files := $(CLEAN_FILES)
1343 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1344
1345 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1346 $(clean-dirs):
1347         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1348
1349 vmlinuxclean:
1350         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1351         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1352
1353 clean: archclean vmlinuxclean
1354
1355 # mrproper - Delete all generated files, including .config
1356 #
1357 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1358 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1359 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1360
1361 PHONY += $(mrproper-dirs) mrproper
1362 $(mrproper-dirs):
1363         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1364
1365 mrproper: clean $(mrproper-dirs)
1366         $(call cmd,rmdirs)
1367         $(call cmd,rmfiles)
1368
1369 # distclean
1370 #
1371 PHONY += distclean
1372
1373 distclean: mrproper
1374         @find $(srctree) $(RCS_FIND_IGNORE) \
1375                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1376                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1377                 -o -name 'core' \) \
1378                 -type f -print | xargs rm -f
1379
1380
1381 # Packaging of the kernel to various formats
1382 # ---------------------------------------------------------------------------
1383 package-dir     := scripts/package
1384
1385 %src-pkg: FORCE
1386         $(Q)$(MAKE) $(build)=$(package-dir) $@
1387 %pkg: include/config/kernel.release FORCE
1388         $(Q)$(MAKE) $(build)=$(package-dir) $@
1389
1390
1391 # Brief documentation of the typical targets used
1392 # ---------------------------------------------------------------------------
1393
1394 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1395 boards := $(sort $(notdir $(boards)))
1396 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1397 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1398
1399 PHONY += help
1400 help:
1401         @echo  'Cleaning targets:'
1402         @echo  '  clean           - Remove most generated files but keep the config and'
1403         @echo  '                    enough build support to build external modules'
1404         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1405         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1406         @echo  ''
1407         @echo  'Configuration targets:'
1408         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1409         @echo  ''
1410         @echo  'Other generic targets:'
1411         @echo  '  all             - Build all targets marked with [*]'
1412         @echo  '* vmlinux         - Build the bare kernel'
1413         @echo  '* modules         - Build all modules'
1414         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1415         @echo  '  dir/            - Build all files in dir and below'
1416         @echo  '  dir/file.[ois]  - Build specified target only'
1417         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1418         @echo  '                    (requires compiler support for LLVM assembly generation)'
1419         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1420         @echo  '                    (requires a recent binutils and recent build (System.map))'
1421         @echo  '  dir/file.ko     - Build module including final link'
1422         @echo  '  modules_prepare - Set up for building external modules'
1423         @echo  '  tags/TAGS       - Generate tags file for editors'
1424         @echo  '  cscope          - Generate cscope index'
1425         @echo  '  gtags           - Generate GNU GLOBAL index'
1426         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1427         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1428         @echo  '  image_name      - Output the image name (use with make -s)'
1429         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1430          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1431          echo  ''
1432         @echo  'Static analysers:'
1433         @echo  '  checkstack      - Generate a list of stack hogs'
1434         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1435         @echo  '  versioncheck    - Sanity check on version.h usage'
1436         @echo  '  includecheck    - Check for duplicate included header files'
1437         @echo  '  export_report   - List the usages of all exported symbols'
1438         @echo  '  headers_check   - Sanity check on exported headers'
1439         @echo  '  headerdep       - Detect inclusion cycles in headers'
1440         @echo  '  coccicheck      - Check with Coccinelle'
1441         @echo  ''
1442         @echo  'Kernel selftest:'
1443         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1444         @echo  '                    Build, install, and boot kernel before'
1445         @echo  '                    running kselftest on it'
1446         @echo  '  kselftest-clean - Remove all generated kselftest files'
1447         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1448         @echo  '                    .config.'
1449         @echo  ''
1450         @$(if $(dtstree), \
1451                 echo 'Devicetree:'; \
1452                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1453                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1454                 echo '')
1455
1456         @echo 'Userspace tools targets:'
1457         @echo '  use "make tools/help"'
1458         @echo '  or  "cd tools; make help"'
1459         @echo  ''
1460         @echo  'Kernel packaging:'
1461         @$(MAKE) $(build)=$(package-dir) help
1462         @echo  ''
1463         @echo  'Documentation targets:'
1464         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1465         @echo  ''
1466         @echo  'Architecture specific targets ($(SRCARCH)):'
1467         @$(if $(archhelp),$(archhelp),\
1468                 echo '  No architecture specific help defined for $(SRCARCH)')
1469         @echo  ''
1470         @$(if $(boards), \
1471                 $(foreach b, $(boards), \
1472                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1473                 echo '')
1474         @$(if $(board-dirs), \
1475                 $(foreach b, $(board-dirs), \
1476                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1477                 printf "  %-16s - Show all of the above\\n" help-boards; \
1478                 echo '')
1479
1480         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1481         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1482         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1483         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1484         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1485         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1486         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1487         @echo  '                1: warnings which may be relevant and do not occur too often'
1488         @echo  '                2: warnings which occur quite often but may still be relevant'
1489         @echo  '                3: more obscure warnings, can most likely be ignored'
1490         @echo  '                Multiple levels can be combined with W=12 or W=123'
1491         @echo  ''
1492         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1493         @echo  'For further info see the ./README file'
1494
1495
1496 help-board-dirs := $(addprefix help-,$(board-dirs))
1497
1498 help-boards: $(help-board-dirs)
1499
1500 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1501
1502 $(help-board-dirs): help-%:
1503         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1504         @$(if $(boards-per-dir), \
1505                 $(foreach b, $(boards-per-dir), \
1506                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1507                 echo '')
1508
1509
1510 # Documentation targets
1511 # ---------------------------------------------------------------------------
1512 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1513                linkcheckdocs dochelp refcheckdocs
1514 PHONY += $(DOC_TARGETS)
1515 $(DOC_TARGETS): scripts_basic FORCE
1516         $(Q)$(MAKE) $(build)=Documentation $@
1517
1518 # Misc
1519 # ---------------------------------------------------------------------------
1520
1521 PHONY += scripts_gdb
1522 scripts_gdb: prepare
1523         $(Q)$(MAKE) $(build)=scripts/gdb
1524         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1525
1526 ifdef CONFIG_GDB_SCRIPTS
1527 all: scripts_gdb
1528 endif
1529
1530 else # KBUILD_EXTMOD
1531
1532 ###
1533 # External module support.
1534 # When building external modules the kernel used as basis is considered
1535 # read-only, and no consistency checks are made and the make
1536 # system is not used on the basis kernel. If updates are required
1537 # in the basis kernel ordinary make commands (without M=...) must
1538 # be used.
1539 #
1540 # The following are the only valid targets when building external
1541 # modules.
1542 # make M=dir clean     Delete all automatically generated files
1543 # make M=dir modules   Make all modules in specified dir
1544 # make M=dir           Same as 'make M=dir modules'
1545 # make M=dir modules_install
1546 #                      Install the modules built in the module directory
1547 #                      Assumes install directory is already created
1548
1549 # We are always building modules
1550 KBUILD_MODULES := 1
1551
1552 PHONY += $(objtree)/Module.symvers
1553 $(objtree)/Module.symvers:
1554         @test -e $(objtree)/Module.symvers || ( \
1555         echo; \
1556         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1557         echo "           is missing; modules will have no dependencies and modversions."; \
1558         echo )
1559
1560 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1561 PHONY += $(module-dirs) modules
1562 $(module-dirs): prepare $(objtree)/Module.symvers
1563         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1564
1565 modules: $(module-dirs)
1566         @$(kecho) '  Building modules, stage 2.';
1567         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1568
1569 PHONY += modules_install
1570 modules_install: _emodinst_ _emodinst_post
1571
1572 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1573 PHONY += _emodinst_
1574 _emodinst_:
1575         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1576         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1577
1578 PHONY += _emodinst_post
1579 _emodinst_post: _emodinst_
1580         $(call cmd,depmod)
1581
1582 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1583
1584 PHONY += $(clean-dirs) clean
1585 $(clean-dirs):
1586         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1587
1588 clean:  rm-dirs := $(MODVERDIR)
1589 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1590
1591 PHONY += help
1592 help:
1593         @echo  '  Building external modules.'
1594         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1595         @echo  ''
1596         @echo  '  modules         - default target, build the module(s)'
1597         @echo  '  modules_install - install the module'
1598         @echo  '  clean           - remove generated files in module directory only'
1599         @echo  ''
1600
1601 PHONY += prepare
1602 prepare:
1603         $(cmd_crmodverdir)
1604 endif # KBUILD_EXTMOD
1605
1606 clean: $(clean-dirs)
1607         $(call cmd,rmdirs)
1608         $(call cmd,rmfiles)
1609         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1610                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1611                 -o -name '*.ko.*' \
1612                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1613                 -o -name '*.dwo' -o -name '*.lst' \
1614                 -o -name '*.su'  \
1615                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1616                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1617                 -o -name '*.asn1.[ch]' \
1618                 -o -name '*.symtypes' -o -name 'modules.order' \
1619                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1620                 -o -name '*.c.[012]*.*' \
1621                 -o -name '*.ll' \
1622                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1623
1624 # Generate tags for editors
1625 # ---------------------------------------------------------------------------
1626 quiet_cmd_tags = GEN     $@
1627       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1628
1629 tags TAGS cscope gtags: FORCE
1630         $(call cmd,tags)
1631
1632 # Scripts to check various things for consistency
1633 # ---------------------------------------------------------------------------
1634
1635 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1636
1637 includecheck:
1638         find $(srctree)/* $(RCS_FIND_IGNORE) \
1639                 -name '*.[hcS]' -type f -print | sort \
1640                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1641
1642 versioncheck:
1643         find $(srctree)/* $(RCS_FIND_IGNORE) \
1644                 -name '*.[hcS]' -type f -print | sort \
1645                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1646
1647 coccicheck:
1648         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1649
1650 namespacecheck:
1651         $(PERL) $(srctree)/scripts/namespace.pl
1652
1653 export_report:
1654         $(PERL) $(srctree)/scripts/export_report.pl
1655
1656 PHONY += checkstack kernelrelease kernelversion image_name
1657
1658 # UML needs a little special treatment here.  It wants to use the host
1659 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1660 # else wants $(ARCH), including people doing cross-builds, which means
1661 # that $(SUBARCH) doesn't work here.
1662 ifeq ($(ARCH), um)
1663 CHECKSTACK_ARCH := $(SUBARCH)
1664 else
1665 CHECKSTACK_ARCH := $(ARCH)
1666 endif
1667 checkstack:
1668         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1669         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1670
1671 kernelrelease:
1672         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1673
1674 kernelversion:
1675         @echo $(KERNELVERSION)
1676
1677 image_name:
1678         @echo $(KBUILD_IMAGE)
1679
1680 # Clear a bunch of variables before executing the submake
1681 tools/: FORCE
1682         $(Q)mkdir -p $(objtree)/tools
1683         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1684
1685 tools/%: FORCE
1686         $(Q)mkdir -p $(objtree)/tools
1687         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1688
1689 # Single targets
1690 # ---------------------------------------------------------------------------
1691 # Single targets are compatible with:
1692 # - build with mixed source and output
1693 # - build with separate output dir 'make O=...'
1694 # - external modules
1695 #
1696 #  target-dir => where to store outputfile
1697 #  build-dir  => directory in kernel source tree to use
1698
1699 ifeq ($(KBUILD_EXTMOD),)
1700         build-dir  = $(patsubst %/,%,$(dir $@))
1701         target-dir = $(dir $@)
1702 else
1703         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1704         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1705         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1706 endif
1707
1708 %.s: %.c prepare FORCE
1709         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1710 %.i: %.c prepare FORCE
1711         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1712 %.o: %.c prepare FORCE
1713         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1714 %.lst: %.c prepare FORCE
1715         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1716 %.s: %.S prepare FORCE
1717         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1718 %.o: %.S prepare FORCE
1719         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1720 %.symtypes: %.c prepare FORCE
1721         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1722 %.ll: %.c prepare FORCE
1723         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1724
1725 # Modules
1726 PHONY += /
1727 /: ./
1728
1729 # Make sure the latest headers are built for Documentation
1730 Documentation/ samples/: headers_install
1731 %/: prepare FORCE
1732         $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)
1733 %.ko: prepare FORCE
1734         $(Q)$(MAKE) $(build)=$(build-dir) $(@:.ko=.o)
1735         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1736
1737 # FIXME Should go into a make.lib or something
1738 # ===========================================================================
1739
1740 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1741       cmd_rmdirs = rm -rf $(rm-dirs)
1742
1743 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1744       cmd_rmfiles = rm -f $(rm-files)
1745
1746 # Run depmod only if we have System.map and depmod is executable
1747 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1748       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1749                    $(KERNELRELEASE)
1750
1751 # Create temporary dir for module support files
1752 # clean it up only when building all modules
1753 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1754                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1755
1756 # read saved command lines for existing targets
1757 existing-targets := $(wildcard $(sort $(targets)))
1758
1759 cmd_files := $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1760 $(cmd_files): ; # Do not try to update included dependency files
1761 -include $(cmd_files)
1762
1763 endif   # ifeq ($(config-targets),1)
1764 endif   # ifeq ($(mixed-targets),1)
1765 endif   # skip-makefile
1766
1767 PHONY += FORCE
1768 FORCE:
1769
1770 # Declare the contents of the PHONY variable as phony.  We keep that
1771 # information in a variable so we can use it in if_changed and friends.
1772 .PHONY: $(PHONY)