Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 15
   4 SUBLEVEL = 18
   5 EXTRAVERSION =
   6 NAME = Fearless Coyote
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # 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.o 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 = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Call message checker as part of the C compilation
 180 #
 181 # Use 'make D=1' to enable checking
 182 # Use 'make D=2' to create the message catalog
 183
 184 ifdef D
 185   ifeq ("$(origin D)", "command line")
 186     KBUILD_KMSG_CHECK = $(D)
 187   endif
 188 endif
 189 ifndef KBUILD_KMSG_CHECK
 190   KBUILD_KMSG_CHECK = 0
 191 endif
 192
 193 # Use make M=dir to specify directory of external module to build
 194 # Old syntax make ... SUBDIRS=$PWD is still supported
 195 # Setting the environment variable KBUILD_EXTMOD take precedence
 196 ifdef SUBDIRS
 197   KBUILD_EXTMOD ?= $(SUBDIRS)
 198 endif
 199
 200 ifeq ("$(origin M)", "command line")
 201   KBUILD_EXTMOD := $(M)
 202 endif
 203
 204 ifeq ($(KBUILD_SRC),)
 205         # building in the source tree
 206         srctree := .
 207 else
 208         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 209                 # building in a subdirectory of the source tree
 210                 srctree := ..
 211         else
 212                 srctree := $(KBUILD_SRC)
 213         endif
 214 endif
 215
 216 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 217
 218 objtree         := .
 219 src             := $(srctree)
 220 obj             := $(objtree)
 221
 222 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 223
 224 export srctree objtree VPATH
 225
 226 # To make sure we do not include .config for any of the *config targets
 227 # catch them early, and hand them over to scripts/kconfig/Makefile
 228 # It is allowed to specify more targets when calling make, including
 229 # mixing *config targets and build targets.
 230 # For example 'make oldconfig all'.
 231 # Detect when mixed targets is specified, and make a second invocation
 232 # of make so .config is not included in this case either (for *config).
 233
 234 version_h := include/generated/uapi/linux/version.h
 235 old_version_h := include/linux/version.h
 236
 237 no-dot-config-targets := clean mrproper distclean \
 238                          cscope gtags TAGS tags help% %docs check% coccicheck \
 239                          $(version_h) headers_% archheaders archscripts \
 240                          kernelversion %src-pkg
 241
 242 config-targets := 0
 243 mixed-targets  := 0
 244 dot-config     := 1
 245
 246 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 247         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 248                 dot-config := 0
 249         endif
 250 endif
 251
 252 ifeq ($(KBUILD_EXTMOD),)
 253         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 254                 config-targets := 1
 255                 ifneq ($(words $(MAKECMDGOALS)),1)
 256                         mixed-targets := 1
 257                 endif
 258         endif
 259 endif
 260 # install and modules_install need also be processed one by one
 261 ifneq ($(filter install,$(MAKECMDGOALS)),)
 262         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 263                 mixed-targets := 1
 264         endif
 265 endif
 266
 267 ifeq ($(mixed-targets),1)
 268 # ===========================================================================
 269 # We're called with mixed targets (*config and build targets).
 270 # Handle them one by one.
 271
 272 PHONY += $(MAKECMDGOALS) __build_one_by_one
 273
 274 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 275         @:
 276
 277 __build_one_by_one:
 278         $(Q)set -e; \
 279         for i in $(MAKECMDGOALS); do \
 280                 $(MAKE) -f $(srctree)/Makefile $$i; \
 281         done
 282
 283 else
 284
 285 # We need some generic definitions (do not try to remake the file).
 286 scripts/Kbuild.include: ;
 287 include scripts/Kbuild.include
 288
 289 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 290 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 291 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 292 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 293
 294 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 295 # first, and if a usermode build is happening, the "ARCH=um" on the command
 296 # line overrides the setting of ARCH below.  If a native build is happening,
 297 # then ARCH is assigned, getting whatever value it gets normally, and
 298 # SUBARCH is subsequently ignored.
 299
 300 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 301                                   -e s/sun4u/sparc64/ \
 302                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 303                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 304                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 305                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
 306                                   -e s/riscv.*/riscv/)
 307
 308 # Cross compiling and selecting different set of gcc/bin-utils
 309 # ---------------------------------------------------------------------------
 310 #
 311 # When performing cross compilation for other architectures ARCH shall be set
 312 # to the target architecture. (See arch/* for the possibilities).
 313 # ARCH can be set during invocation of make:
 314 # make ARCH=ia64
 315 # Another way is to have ARCH set in the environment.
 316 # The default ARCH is the host where make is executed.
 317
 318 # CROSS_COMPILE specify the prefix used for all executables used
 319 # during compilation. Only gcc and related bin-utils executables
 320 # are prefixed with $(CROSS_COMPILE).
 321 # CROSS_COMPILE can be set on the command line
 322 # make CROSS_COMPILE=ia64-linux-
 323 # Alternatively CROSS_COMPILE can be set in the environment.
 324 # A third alternative is to store a setting in .config so that plain
 325 # "make" in the configured kernel build directory always uses that.
 326 # Default value for CROSS_COMPILE is not to prefix executables
 327 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 328 ARCH            ?= $(SUBARCH)
 329 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 330
 331 # Architecture as present in compile.h
 332 UTS_MACHINE     := $(ARCH)
 333 SRCARCH         := $(ARCH)
 334
 335 # Additional ARCH settings for x86
 336 ifeq ($(ARCH),i386)
 337         SRCARCH := x86
 338 endif
 339 ifeq ($(ARCH),x86_64)
 340         SRCARCH := x86
 341 endif
 342
 343 # Additional ARCH settings for sparc
 344 ifeq ($(ARCH),sparc32)
 345        SRCARCH := sparc
 346 endif
 347 ifeq ($(ARCH),sparc64)
 348        SRCARCH := sparc
 349 endif
 350
 351 # Additional ARCH settings for sh
 352 ifeq ($(ARCH),sh64)
 353        SRCARCH := sh
 354 endif
 355
 356 # Additional ARCH settings for tile
 357 ifeq ($(ARCH),tilepro)
 358        SRCARCH := tile
 359 endif
 360 ifeq ($(ARCH),tilegx)
 361        SRCARCH := tile
 362 endif
 363
 364 KCONFIG_CONFIG  ?= .config
 365 export KCONFIG_CONFIG
 366
 367 # SHELL used by kbuild
 368 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 369           else if [ -x /bin/bash ]; then echo /bin/bash; \
 370           else echo sh; fi ; fi)
 371
 372 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 373 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 374 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 375
 376 HOSTCC       = gcc
 377 HOSTCXX      = g++
 378 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 379                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 380 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 381 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 382 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 383
 384 # Make variables (CC, etc...)
 385 AS              = $(CROSS_COMPILE)as
 386 LD              = $(CROSS_COMPILE)ld
 387 CC              = $(CROSS_COMPILE)gcc
 388 CPP             = $(CC) -E
 389 AR              = $(CROSS_COMPILE)ar
 390 NM              = $(CROSS_COMPILE)nm
 391 STRIP           = $(CROSS_COMPILE)strip
 392 OBJCOPY         = $(CROSS_COMPILE)objcopy
 393 OBJDUMP         = $(CROSS_COMPILE)objdump
 394 AWK             = awk
 395 GENKSYMS        = scripts/genksyms/genksyms
 396 INSTALLKERNEL  := installkernel
 397 DEPMOD          = /sbin/depmod
 398 PERL            = perl
 399 PYTHON          = python
 400 CHECK           = sparse
 401
 402 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 403                   -Wbitwise -Wno-return-void $(CF)
 404 KMSG_CHECK      = $(srctree)/scripts/kmsg-doc
 405 NOSTDINC_FLAGS  =
 406 CFLAGS_MODULE   =
 407 AFLAGS_MODULE   =
 408 LDFLAGS_MODULE  =
 409 CFLAGS_KERNEL   =
 410 AFLAGS_KERNEL   =
 411 LDFLAGS_vmlinux =
 412
 413 # Prefer linux-backports-modules
 414 ifneq ($(KBUILD_SRC),)
 415 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
 416 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
 417 endif
 418 endif
 419
 420 # Use USERINCLUDE when you must reference the UAPI directories only.
 421 USERINCLUDE    := \
 422                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 423                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 424                 -I$(srctree)/include/uapi \
 425                 -I$(objtree)/include/generated/uapi \
 426                 -include $(srctree)/include/linux/kconfig.h
 427
 428 # Use LINUXINCLUDE when you must reference the include/ directory.
 429 # Needed to be compatible with the O= option
 430 LINUXINCLUDE    := \
 431                 $(UBUNTUINCLUDE) \
 432                 -I$(srctree)/arch/$(SRCARCH)/include \
 433                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 434                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 435                 -I$(objtree)/include \
 436                 $(USERINCLUDE)
 437
 438 # UBUNTU: Include our third party driver stuff too
 439 LINUXINCLUDE   += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
 440
 441 KBUILD_AFLAGS   := -D__ASSEMBLY__
 442 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 443                    -fno-strict-aliasing -fno-common -fshort-wchar \
 444                    -Werror-implicit-function-declaration \
 445                    -Wno-format-security \
 446                    -std=gnu89
 447 KBUILD_CPPFLAGS := -D__KERNEL__
 448 KBUILD_AFLAGS_KERNEL :=
 449 KBUILD_CFLAGS_KERNEL :=
 450 KBUILD_AFLAGS_MODULE  := -DMODULE
 451 KBUILD_CFLAGS_MODULE  := -DMODULE
 452 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 453 GCC_PLUGINS_CFLAGS :=
 454
 455 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 456 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 457 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 458 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 459
 460 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 461 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 462 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 463 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 464 export KBUILD_KMSG_CHECK KMSG_CHECK
 465 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 466 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 467 export KBUILD_ARFLAGS
 468
 469 # When compiling out-of-tree modules, put MODVERDIR in the module
 470 # tree rather than in the kernel tree. The kernel tree might
 471 # even be read-only.
 472 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 473
 474 # Files to ignore in find ... statements
 475
 476 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 477                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 478                           -prune -o
 479 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 480                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 481
 482 # ===========================================================================
 483 # Rules shared between *config targets and build targets
 484
 485 # Basic helpers built in scripts/basic/
 486 PHONY += scripts_basic
 487 scripts_basic:
 488         $(Q)$(MAKE) $(build)=scripts/basic
 489         $(Q)rm -f .tmp_quiet_recordmcount
 490
 491 # To avoid any implicit rule to kick in, define an empty command.
 492 scripts/basic/%: scripts_basic ;
 493
 494 PHONY += outputmakefile
 495 # outputmakefile generates a Makefile in the output directory, if using a
 496 # separate output directory. This allows convenient use of make in the
 497 # output directory.
 498 outputmakefile:
 499 ifneq ($(KBUILD_SRC),)
 500         $(Q)ln -fsn $(srctree) source
 501         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 502             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 503 endif
 504
 505 ifeq ($(cc-name),clang)
 506 ifneq ($(CROSS_COMPILE),)
 507 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 508 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 509 endif
 510 ifneq ($(GCC_TOOLCHAIN),)
 511 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 512 endif
 513 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 514 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 515 endif
 516
 517 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 518 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 519 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 520 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 521 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 522 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 523 export RETPOLINE_CFLAGS
 524 export RETPOLINE_VDSO_CFLAGS
 525
 526 ifeq ($(config-targets),1)
 527 # ===========================================================================
 528 # *config targets only - make sure prerequisites are updated, and descend
 529 # in scripts/kconfig to make the *config target
 530
 531 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 532 # KBUILD_DEFCONFIG may point out an alternative default configuration
 533 # used for 'make defconfig'
 534 include arch/$(SRCARCH)/Makefile
 535 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 536
 537 config: scripts_basic outputmakefile FORCE
 538         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 539
 540 %config: scripts_basic outputmakefile FORCE
 541         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 542
 543 else
 544 # ===========================================================================
 545 # Build targets only - this includes vmlinux, arch specific targets, clean
 546 # targets and others. In general all targets except *config targets.
 547
 548 # If building an external module we do not care about the all: rule
 549 # but instead _all depend on modules
 550 PHONY += all
 551 ifeq ($(KBUILD_EXTMOD),)
 552 _all: all
 553 else
 554 _all: modules
 555 endif
 556
 557 # Decide whether to build built-in, modular, or both.
 558 # Normally, just do built-in.
 559
 560 KBUILD_MODULES :=
 561 KBUILD_BUILTIN := 1
 562
 563 # If we have only "make modules", don't compile built-in objects.
 564 # When we're building modules with modversions, we need to consider
 565 # the built-in objects during the descend as well, in order to
 566 # make sure the checksums are up to date before we record them.
 567
 568 ifeq ($(MAKECMDGOALS),modules)
 569   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 570 endif
 571
 572 # If we have "make <whatever> modules", compile modules
 573 # in addition to whatever we do anyway.
 574 # Just "make" or "make all" shall build modules as well
 575
 576 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 577   KBUILD_MODULES := 1
 578 endif
 579
 580 ifeq ($(MAKECMDGOALS),)
 581   KBUILD_MODULES := 1
 582 endif
 583
 584 export KBUILD_MODULES KBUILD_BUILTIN
 585
 586 ifeq ($(KBUILD_EXTMOD),)
 587 # Additional helpers built in scripts/
 588 # Carefully list dependencies so we do not try to build scripts twice
 589 # in parallel
 590 PHONY += scripts
 591 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 592          asm-generic gcc-plugins
 593         $(Q)$(MAKE) $(build)=$(@)
 594
 595 # Objects we will link into vmlinux / subdirs we need to visit
 596 init-y          := init/
 597 drivers-y       := drivers/ sound/ firmware/ ubuntu/
 598 net-y           := net/
 599 libs-y          := lib/
 600 core-y          := usr/
 601 virt-y          := virt/
 602 endif # KBUILD_EXTMOD
 603
 604 ifeq ($(dot-config),1)
 605 # Read in config
 606 -include include/config/auto.conf
 607
 608 ifeq ($(KBUILD_EXTMOD),)
 609 # Read in dependencies to all Kconfig* files, make sure to run
 610 # oldconfig if changes are detected.
 611 -include include/config/auto.conf.cmd
 612
 613 # To avoid any implicit rule to kick in, define an empty command
 614 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 615
 616 # If .config is newer than include/config/auto.conf, someone tinkered
 617 # with it and forgot to run make oldconfig.
 618 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 619 # we execute the config step to be sure to catch updated Kconfig files
 620 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 621         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 622 else
 623 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 624 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 625 PHONY += include/config/auto.conf
 626
 627 include/config/auto.conf:
 628         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 629         echo >&2;                                                       \
 630         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 631         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 632         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 633         echo >&2 ;                                                      \
 634         /bin/false)
 635
 636 endif # KBUILD_EXTMOD
 637
 638 else
 639 # Dummy target needed, because used as prerequisite
 640 include/config/auto.conf: ;
 641 endif # $(dot-config)
 642
 643 # For the kernel to actually contain only the needed exported symbols,
 644 # we have to build modules as well to determine what those symbols are.
 645 # (this can be evaluated only once include/config/auto.conf has been included)
 646 ifdef CONFIG_TRIM_UNUSED_KSYMS
 647   KBUILD_MODULES := 1
 648 endif
 649
 650 # The all: target is the default when no target is given on the
 651 # command line.
 652 # This allow a user to issue only 'make' to build a kernel including modules
 653 # Defaults to vmlinux, but the arch makefile usually adds further targets
 654 all: vmlinux
 655
 656 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 657 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 658 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 659 export CFLAGS_GCOV CFLAGS_KCOV
 660
 661 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 662 # values of the respective KBUILD_* variables
 663 ARCH_CPPFLAGS :=
 664 ARCH_AFLAGS :=
 665 ARCH_CFLAGS :=
 666 include arch/$(SRCARCH)/Makefile
 667
 668 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 669 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 670 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 671 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 672 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 673 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 674
 675 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 676 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 677 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 678 else
 679 ifdef CONFIG_PROFILE_ALL_BRANCHES
 680 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 681 else
 682 KBUILD_CFLAGS   += -O2
 683 endif
 684 endif
 685
 686 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 687                         $(call cc-disable-warning,maybe-uninitialized,))
 688
 689 # Tell gcc to never replace conditional load with a non-conditional one
 690 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 691
 692 # check for 'asm goto'
 693 ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 694         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 695         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 696 endif
 697
 698 include scripts/Makefile.kcov
 699 include scripts/Makefile.gcc-plugins
 700
 701 ifdef CONFIG_READABLE_ASM
 702 # Disable optimizations that make assembler listings hard to read.
 703 # reorder blocks reorders the control in the function
 704 # ipa clone creates specialized cloned functions
 705 # partial inlining inlines only parts of functions
 706 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 707                  $(call cc-option,-fno-ipa-cp-clone,) \
 708                  $(call cc-option,-fno-partial-inlining)
 709 endif
 710
 711 ifneq ($(CONFIG_FRAME_WARN),0)
 712 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 713 endif
 714
 715 # This selects the stack protector compiler flag. Testing it is delayed
 716 # until after .config has been reprocessed, in the prepare-compiler-check
 717 # target.
 718 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 719   stackp-flag := -fstack-protector
 720   stackp-name := REGULAR
 721 else
 722 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 723   stackp-flag := -fstack-protector-strong
 724   stackp-name := STRONG
 725 else
 726   # Force off for distro compilers that enable stack protector by default.
 727   stackp-flag := $(call cc-option, -fno-stack-protector)
 728 endif
 729 endif
 730 # Find arch-specific stack protector compiler sanity-checking script.
 731 ifdef CONFIG_CC_STACKPROTECTOR
 732   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 733   stackp-check := $(wildcard $(stackp-path))
 734 endif
 735 KBUILD_CFLAGS += $(stackp-flag)
 736
 737 ifeq ($(cc-name),clang)
 738 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 739 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 740 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 741 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 742 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 743 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 744 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 745 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 746 # See modpost pattern 2
 747 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 748 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 749 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 750 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 751 else
 752
 753 # These warnings generated too much noise in a regular build.
 754 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 755 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 756 endif
 757
 758 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 759 ifdef CONFIG_FRAME_POINTER
 760 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 761 else
 762 # Some targets (ARM with Thumb2, for example), can't be built with frame
 763 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 764 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 765 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 766 # -fomit-frame-pointer with FUNCTION_TRACER.
 767 ifndef CONFIG_FUNCTION_TRACER
 768 KBUILD_CFLAGS   += -fomit-frame-pointer
 769 endif
 770 endif
 771
 772 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 773
 774 ifdef CONFIG_DEBUG_INFO
 775 ifdef CONFIG_DEBUG_INFO_SPLIT
 776 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 777 else
 778 KBUILD_CFLAGS   += -g
 779 endif
 780 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 781 endif
 782 ifdef CONFIG_DEBUG_INFO_DWARF4
 783 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 784 endif
 785
 786 ifdef CONFIG_DEBUG_INFO_REDUCED
 787 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 788                    $(call cc-option,-fno-var-tracking)
 789 endif
 790
 791 ifdef CONFIG_FUNCTION_TRACER
 792 ifndef CC_FLAGS_FTRACE
 793 CC_FLAGS_FTRACE := -pg
 794 endif
 795 export CC_FLAGS_FTRACE
 796 ifdef CONFIG_HAVE_FENTRY
 797 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 798 endif
 799 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 800 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 801 ifdef CONFIG_DYNAMIC_FTRACE
 802         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 803                 BUILD_C_RECORDMCOUNT := y
 804                 export BUILD_C_RECORDMCOUNT
 805         endif
 806 endif
 807 endif
 808
 809 # We trigger additional mismatches with less inlining
 810 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 811 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 812 endif
 813
 814 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 815 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 816 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 817 endif
 818
 819 # arch Makefile may override CC so keep this after arch Makefile is included
 820 NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
 821 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 822
 823 # warn about C99 declaration after statement
 824 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 825
 826 # disable pointer signed / unsigned warnings in gcc 4.0
 827 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 828
 829 # disable invalid "can't wrap" optimizations for signed / pointers
 830 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 831
 832 # clang sets -fmerge-all-constants by default as optimization, but this
 833 # is non-conforming behavior for C and in fact breaks the kernel, so we
 834 # need to disable it here generally.
 835 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 836
 837 # for gcc -fno-merge-all-constants disables everything, but it is fine
 838 # to have actual conforming behavior enabled.
 839 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 840
 841 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 842 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 843
 844 # conserve stack if available
 845 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 846
 847 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 848 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 849
 850 # require functions to have arguments in prototypes, not empty 'int foo()'
 851 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 852
 853 # Prohibit date/time macros, which would make the build non-deterministic
 854 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 855
 856 # enforce correct pointer usage
 857 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 858
 859 # Require designated initializers for all marked structures
 860 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 861
 862 # use the deterministic mode of AR if available
 863 KBUILD_ARFLAGS := $(call ar-option,D)
 864
 865 include scripts/Makefile.kasan
 866 include scripts/Makefile.extrawarn
 867 include scripts/Makefile.ubsan
 868
 869 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 870 # last assignments
 871 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 872 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 873 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 874
 875 # Use --build-id when available.
 876 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 877                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 878 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 879 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 880
 881 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 882 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 883 endif
 884
 885 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 886 LDFLAGS_vmlinux += $(call ld-option, -X,)
 887 endif
 888
 889 # Default kernel image to build when no specific target is given.
 890 # KBUILD_IMAGE may be overruled on the command line or
 891 # set in the environment
 892 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 893 # this default value
 894 export KBUILD_IMAGE ?= vmlinux
 895
 896 #
 897 # INSTALL_PATH specifies where to place the updated kernel and system map
 898 # images. Default is /boot, but you can set it to other values
 899 export  INSTALL_PATH ?= /boot
 900
 901 #
 902 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 903 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 904 # an argument if needed. Otherwise it defaults to the kernel install path
 905 #
 906 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 907
 908 #
 909 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 910 # relocations required by build roots.  This is not defined in the
 911 # makefile but the argument can be passed to make if needed.
 912 #
 913
 914 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 915 export MODLIB
 916
 917 #
 918 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 919 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 920 # the default option --strip-debug will be used.  Otherwise,
 921 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 922
 923 ifdef INSTALL_MOD_STRIP
 924 ifeq ($(INSTALL_MOD_STRIP),1)
 925 mod_strip_cmd = $(STRIP) --strip-debug
 926 else
 927 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 928 endif # INSTALL_MOD_STRIP=1
 929 else
 930 mod_strip_cmd = true
 931 endif # INSTALL_MOD_STRIP
 932 export mod_strip_cmd
 933
 934 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 935 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 936 # or CONFIG_MODULE_COMPRESS_XZ.
 937
 938 mod_compress_cmd = true
 939 ifdef CONFIG_MODULE_COMPRESS
 940   ifdef CONFIG_MODULE_COMPRESS_GZIP
 941     mod_compress_cmd = gzip -n -f
 942   endif # CONFIG_MODULE_COMPRESS_GZIP
 943   ifdef CONFIG_MODULE_COMPRESS_XZ
 944     mod_compress_cmd = xz -f
 945   endif # CONFIG_MODULE_COMPRESS_XZ
 946 endif # CONFIG_MODULE_COMPRESS
 947 export mod_compress_cmd
 948
 949 # Select initial ramdisk compression format, default is gzip(1).
 950 # This shall be used by the dracut(8) tool while creating an initramfs image.
 951 #
 952 INITRD_COMPRESS-y                  := gzip
 953 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 954 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 955 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 956 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 957 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 958 # do not export INITRD_COMPRESS, since we didn't actually
 959 # choose a sane default compression above.
 960 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 961
 962 ifdef CONFIG_MODULE_SIG_ALL
 963 $(eval $(call config_filename,MODULE_SIG_KEY))
 964
 965 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 966 else
 967 mod_sign_cmd = true
 968 endif
 969 export mod_sign_cmd
 970
 971 ifdef CONFIG_STACK_VALIDATION
 972   has_libelf := $(call try-run,\
 973                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 974   ifeq ($(has_libelf),1)
 975     objtool_target := tools/objtool FORCE
 976   else
 977     ifdef CONFIG_UNWINDER_ORC
 978       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 979     else
 980       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 981     endif
 982     SKIP_STACK_VALIDATION := 1
 983     export SKIP_STACK_VALIDATION
 984   endif
 985 endif
 986
 987
 988 ifeq ($(KBUILD_EXTMOD),)
 989 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 990
 991 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 992                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 993                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 994
 995 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 996                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 997
 998 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 999 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
1000 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
1001 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
1002 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1003 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
1004 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
1005
1006 # Externally visible symbols (used by link-vmlinux.sh)
1007 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1008 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1009 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1010 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1011 export LDFLAGS_vmlinux
1012 # used by scripts/package/Makefile
1013 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1014
1015 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1016
1017 # Include targets which we want to execute sequentially if the rest of the
1018 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1019 # evaluated more than once.
1020 PHONY += vmlinux_prereq
1021 vmlinux_prereq: $(vmlinux-deps) FORCE
1022 ifdef CONFIG_HEADERS_CHECK
1023         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1024 endif
1025 ifdef CONFIG_GDB_SCRIPTS
1026         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1027 endif
1028 ifdef CONFIG_TRIM_UNUSED_KSYMS
1029         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1030           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1031 endif
1032
1033 # standalone target for easier testing
1034 include/generated/autoksyms.h: FORCE
1035         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1036
1037 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1038
1039 # Final link of vmlinux with optional arch pass after final link
1040 cmd_link-vmlinux =                                                 \
1041         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1042         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1043
1044 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1045         +$(call if_changed,link-vmlinux)
1046
1047 # Build samples along the rest of the kernel
1048 ifdef CONFIG_SAMPLES
1049 vmlinux-dirs += samples
1050 endif
1051
1052 # The actual objects are generated when descending,
1053 # make sure no implicit rule kicks in
1054 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1055
1056 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1057 # Preset locale variables to speed up the build process. Limit locale
1058 # tweaks to this spot to avoid wrong language settings when running
1059 # make menuconfig etc.
1060 # Error messages still appears in the original language
1061
1062 PHONY += $(vmlinux-dirs)
1063 $(vmlinux-dirs): prepare scripts
1064         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1065
1066 define filechk_kernel.release
1067         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1068 endef
1069
1070 # Store (new) KERNELRELEASE string in include/config/kernel.release
1071 include/config/kernel.release: include/config/auto.conf FORCE
1072         $(call filechk,kernel.release)
1073
1074
1075 # Things we need to do before we recursively start building the kernel
1076 # or the modules are listed in "prepare".
1077 # A multi level approach is used. prepareN is processed before prepareN-1.
1078 # archprepare is used in arch Makefiles and when processed asm symlink,
1079 # version.h and scripts_basic is processed / created.
1080
1081 # Listed in dependency order
1082 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1083
1084 # prepare3 is used to check if we are building in a separate output directory,
1085 # and if so do:
1086 # 1) Check that make has not been executed in the kernel src $(srctree)
1087 prepare3: include/config/kernel.release
1088 ifneq ($(KBUILD_SRC),)
1089         @$(kecho) '  Using $(srctree) as source for kernel'
1090         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1091                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1092                 echo >&2 "  in the '$(srctree)' directory.";\
1093                 /bin/false; \
1094         fi;
1095 endif
1096
1097 # prepare2 creates a makefile if using a separate output directory.
1098 # From this point forward, .config has been reprocessed, so any rules
1099 # that need to depend on updated CONFIG_* values can be checked here.
1100 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1101
1102 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1103                    include/config/auto.conf
1104         $(cmd_crmodverdir)
1105
1106 archprepare: archheaders archscripts prepare1 scripts_basic
1107
1108 prepare0: archprepare gcc-plugins
1109         $(Q)$(MAKE) $(build)=.
1110
1111 # All the preparing..
1112 prepare: prepare0 prepare-objtool
1113
1114 # Support for using generic headers in asm-generic
1115 PHONY += asm-generic uapi-asm-generic
1116 asm-generic: uapi-asm-generic
1117         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1118                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1119 uapi-asm-generic:
1120         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1121                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1122
1123 PHONY += prepare-objtool
1124 prepare-objtool: $(objtool_target)
1125
1126 # Check for CONFIG flags that require compiler support. Abort the build
1127 # after .config has been processed, but before the kernel build starts.
1128 #
1129 # For security-sensitive CONFIG options, we don't want to fallback and/or
1130 # silently change which compiler flags will be used, since that leads to
1131 # producing kernels with different security feature characteristics
1132 # depending on the compiler used. (For example, "But I selected
1133 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1134 PHONY += prepare-compiler-check
1135 prepare-compiler-check: FORCE
1136 # Make sure compiler supports requested stack protector flag.
1137 ifdef stackp-name
1138   ifeq ($(call cc-option, $(stackp-flag)),)
1139         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1140                   $(stackp-flag) not supported by compiler >&2 && exit 1
1141   endif
1142 endif
1143 # Make sure compiler does not have buggy stack-protector support.
1144 ifdef stackp-check
1145   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1146         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1147                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1148   endif
1149 endif
1150         @:
1151
1152 # Generate some files
1153 # ---------------------------------------------------------------------------
1154
1155 # KERNELRELEASE can change from a few different places, meaning version.h
1156 # needs to be updated, so this check is forced on all builds
1157
1158 uts_len := 64
1159 define filechk_utsrelease.h
1160         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1161           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1162           exit 1;                                                         \
1163         fi;                                                               \
1164         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1165 endef
1166
1167 define filechk_version.h
1168         (echo \#define LINUX_VERSION_CODE $(shell                         \
1169         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1170         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1171 endef
1172
1173 $(version_h): $(srctree)/Makefile FORCE
1174         $(call filechk,version.h)
1175         $(Q)rm -f $(old_version_h)
1176
1177 include/generated/utsrelease.h: include/config/kernel.release FORCE
1178         $(call filechk,utsrelease.h)
1179
1180 PHONY += headerdep
1181 headerdep:
1182         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1183         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1184
1185 # ---------------------------------------------------------------------------
1186 # Kernel headers
1187
1188 #Default location for installed headers
1189 export INSTALL_HDR_PATH = $(objtree)/usr
1190
1191 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1192 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1193
1194 PHONY += archheaders
1195 archheaders:
1196
1197 PHONY += archscripts
1198 archscripts:
1199
1200 PHONY += __headers
1201 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1202         $(Q)$(MAKE) $(build)=scripts build_unifdef
1203
1204 PHONY += headers_install_all
1205 headers_install_all:
1206         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1207
1208 PHONY += headers_install
1209 headers_install: __headers
1210         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1211           $(error Headers not exportable for the $(SRCARCH) architecture))
1212         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1213         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1214         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1215
1216 PHONY += headers_check_all
1217 headers_check_all: headers_install_all
1218         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1219
1220 PHONY += headers_check
1221 headers_check: headers_install
1222         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1223         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1224         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1225
1226 # ---------------------------------------------------------------------------
1227 # Kernel selftest
1228
1229 PHONY += kselftest
1230 kselftest:
1231         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1232
1233 PHONY += kselftest-clean
1234 kselftest-clean:
1235         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1236
1237 PHONY += kselftest-merge
1238 kselftest-merge:
1239         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1240         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1241                 -m $(objtree)/.config \
1242                 $(srctree)/tools/testing/selftests/*/config
1243         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1244
1245 # ---------------------------------------------------------------------------
1246 # Modules
1247
1248 ifdef CONFIG_MODULES
1249
1250 # By default, build modules as well
1251
1252 all: modules
1253
1254 # Build modules
1255 #
1256 # A module can be listed more than once in obj-m resulting in
1257 # duplicate lines in modules.order files.  Those are removed
1258 # using awk while concatenating to the final file.
1259
1260 PHONY += modules
1261 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1262         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1263         @$(kecho) '  Building modules, stage 2.';
1264         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1265
1266 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1267         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1268
1269 %/modules.builtin: include/config/auto.conf
1270         $(Q)$(MAKE) $(modbuiltin)=$*
1271
1272
1273 # Target to prepare building external modules
1274 PHONY += modules_prepare
1275 modules_prepare: prepare scripts
1276
1277 # Target to install modules
1278 PHONY += modules_install
1279 modules_install: _modinst_ _modinst_post
1280
1281 PHONY += _modinst_
1282 _modinst_:
1283         @rm -rf $(MODLIB)/kernel
1284         @rm -f $(MODLIB)/source
1285         @mkdir -p $(MODLIB)/kernel
1286         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1287         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1288                 rm -f $(MODLIB)/build ; \
1289                 ln -s $(CURDIR) $(MODLIB)/build ; \
1290         fi
1291         @cp -f $(objtree)/modules.order $(MODLIB)/
1292         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1293         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1294
1295 # This depmod is only for convenience to give the initial
1296 # boot a modules.dep even before / is mounted read-write.  However the
1297 # boot script depmod is the master version.
1298 PHONY += _modinst_post
1299 _modinst_post: _modinst_
1300         $(call cmd,depmod)
1301
1302 ifeq ($(CONFIG_MODULE_SIG), y)
1303 PHONY += modules_sign
1304 modules_sign:
1305         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1306 endif
1307
1308 else # CONFIG_MODULES
1309
1310 # Modules not configured
1311 # ---------------------------------------------------------------------------
1312
1313 PHONY += modules modules_install
1314 modules modules_install:
1315         @echo >&2
1316         @echo >&2 "The present kernel configuration has modules disabled."
1317         @echo >&2 "Type 'make config' and enable loadable module support."
1318         @echo >&2 "Then build a kernel with module support enabled."
1319         @echo >&2
1320         @exit 1
1321
1322 endif # CONFIG_MODULES
1323
1324 ###
1325 # Cleaning is done on three levels.
1326 # make clean     Delete most generated files
1327 #                Leave enough to build external modules
1328 # make mrproper  Delete the current configuration, and all generated files
1329 # make distclean Remove editor backup files, patch leftover files and the like
1330
1331 # Directories & files removed with 'make clean'
1332 CLEAN_DIRS  += $(MODVERDIR)
1333
1334 # Directories & files removed with 'make mrproper'
1335 MRPROPER_DIRS  += include/config usr/include include/generated          \
1336                   arch/*/include/generated .tmp_objdiff
1337 MRPROPER_FILES += .config .config.old .version \
1338                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1339                   signing_key.pem signing_key.priv signing_key.x509     \
1340                   x509.genkey extra_certificates signing_key.x509.keyid \
1341                   signing_key.x509.signer vmlinux-gdb.py
1342
1343 # clean - Delete most, but leave enough to build external modules
1344 #
1345 clean: rm-dirs  := $(CLEAN_DIRS)
1346 clean: rm-files := $(CLEAN_FILES)
1347 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1348
1349 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1350 $(clean-dirs):
1351         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1352
1353 vmlinuxclean:
1354         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1355         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1356
1357 clean: archclean vmlinuxclean
1358
1359 # mrproper - Delete all generated files, including .config
1360 #
1361 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1362 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1363 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1364
1365 PHONY += $(mrproper-dirs) mrproper archmrproper
1366 $(mrproper-dirs):
1367         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1368
1369 mrproper: clean archmrproper $(mrproper-dirs)
1370         $(call cmd,rmdirs)
1371         $(call cmd,rmfiles)
1372
1373 # distclean
1374 #
1375 PHONY += distclean
1376
1377 distclean: mrproper
1378         @find $(srctree) $(RCS_FIND_IGNORE) \
1379                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1380                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1381                 -o -name 'core' \) \
1382                 -type f -print | xargs rm -f
1383
1384
1385 # Packaging of the kernel to various formats
1386 # ---------------------------------------------------------------------------
1387 # rpm target kept for backward compatibility
1388 package-dir     := scripts/package
1389
1390 %src-pkg: FORCE
1391         $(Q)$(MAKE) $(build)=$(package-dir) $@
1392 %pkg: include/config/kernel.release FORCE
1393         $(Q)$(MAKE) $(build)=$(package-dir) $@
1394 rpm: rpm-pkg
1395         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1396         @echo "           Please use \"rpm-pkg\" instead."
1397
1398
1399 # Brief documentation of the typical targets used
1400 # ---------------------------------------------------------------------------
1401
1402 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1403 boards := $(sort $(notdir $(boards)))
1404 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1405 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1406
1407 PHONY += help
1408 help:
1409         @echo  'Cleaning targets:'
1410         @echo  '  clean           - Remove most generated files but keep the config and'
1411         @echo  '                    enough build support to build external modules'
1412         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1413         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1414         @echo  ''
1415         @echo  'Configuration targets:'
1416         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1417         @echo  ''
1418         @echo  'Other generic targets:'
1419         @echo  '  all             - Build all targets marked with [*]'
1420         @echo  '* vmlinux         - Build the bare kernel'
1421         @echo  '* modules         - Build all modules'
1422         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1423         @echo  '  dir/            - Build all files in dir and below'
1424         @echo  '  dir/file.[ois]  - Build specified target only'
1425         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1426         @echo  '                    (requires compiler support for LLVM assembly generation)'
1427         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1428         @echo  '                    (requires a recent binutils and recent build (System.map))'
1429         @echo  '  dir/file.ko     - Build module including final link'
1430         @echo  '  modules_prepare - Set up for building external modules'
1431         @echo  '  tags/TAGS       - Generate tags file for editors'
1432         @echo  '  cscope          - Generate cscope index'
1433         @echo  '  gtags           - Generate GNU GLOBAL index'
1434         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1435         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1436         @echo  '  image_name      - Output the image name (use with make -s)'
1437         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1438          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1439          echo  ''
1440         @echo  'Static analysers:'
1441         @echo  '  checkstack      - Generate a list of stack hogs'
1442         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1443         @echo  '  versioncheck    - Sanity check on version.h usage'
1444         @echo  '  includecheck    - Check for duplicate included header files'
1445         @echo  '  export_report   - List the usages of all exported symbols'
1446         @echo  '  headers_check   - Sanity check on exported headers'
1447         @echo  '  headerdep       - Detect inclusion cycles in headers'
1448         @echo  '  coccicheck      - Check with Coccinelle'
1449         @echo  ''
1450         @echo  'Kernel selftest:'
1451         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1452         @echo  '                    Build, install, and boot kernel before'
1453         @echo  '                    running kselftest on it'
1454         @echo  '  kselftest-clean - Remove all generated kselftest files'
1455         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1456         @echo  '                    .config.'
1457         @echo  ''
1458         @echo 'Userspace tools targets:'
1459         @echo '  use "make tools/help"'
1460         @echo '  or  "cd tools; make help"'
1461         @echo  ''
1462         @echo  'Kernel packaging:'
1463         @$(MAKE) $(build)=$(package-dir) help
1464         @echo  ''
1465         @echo  'Documentation targets:'
1466         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1467         @echo  ''
1468         @echo  'Architecture specific targets ($(SRCARCH)):'
1469         @$(if $(archhelp),$(archhelp),\
1470                 echo '  No architecture specific help defined for $(SRCARCH)')
1471         @echo  ''
1472         @$(if $(boards), \
1473                 $(foreach b, $(boards), \
1474                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1475                 echo '')
1476         @$(if $(board-dirs), \
1477                 $(foreach b, $(board-dirs), \
1478                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1479                 printf "  %-16s - Show all of the above\\n" help-boards; \
1480                 echo '')
1481
1482         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1483         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1484         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1485         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1486         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1487         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1488         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1489         @echo  '                1: warnings which may be relevant and do not occur too often'
1490         @echo  '                2: warnings which occur quite often but may still be relevant'
1491         @echo  '                3: more obscure warnings, can most likely be ignored'
1492         @echo  '                Multiple levels can be combined with W=12 or W=123'
1493         @echo  ''
1494         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1495         @echo  'For further info see the ./README file'
1496
1497
1498 help-board-dirs := $(addprefix help-,$(board-dirs))
1499
1500 help-boards: $(help-board-dirs)
1501
1502 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1503
1504 $(help-board-dirs): help-%:
1505         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1506         @$(if $(boards-per-dir), \
1507                 $(foreach b, $(boards-per-dir), \
1508                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1509                 echo '')
1510
1511
1512 # Documentation targets
1513 # ---------------------------------------------------------------------------
1514 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1515                linkcheckdocs dochelp refcheckdocs
1516 PHONY += $(DOC_TARGETS)
1517 $(DOC_TARGETS): scripts_basic FORCE
1518         $(Q)$(MAKE) $(build)=Documentation $@
1519
1520 else # KBUILD_EXTMOD
1521
1522 ###
1523 # External module support.
1524 # When building external modules the kernel used as basis is considered
1525 # read-only, and no consistency checks are made and the make
1526 # system is not used on the basis kernel. If updates are required
1527 # in the basis kernel ordinary make commands (without M=...) must
1528 # be used.
1529 #
1530 # The following are the only valid targets when building external
1531 # modules.
1532 # make M=dir clean     Delete all automatically generated files
1533 # make M=dir modules   Make all modules in specified dir
1534 # make M=dir           Same as 'make M=dir modules'
1535 # make M=dir modules_install
1536 #                      Install the modules built in the module directory
1537 #                      Assumes install directory is already created
1538
1539 # We are always building modules
1540 KBUILD_MODULES := 1
1541 PHONY += crmodverdir
1542 crmodverdir:
1543         $(cmd_crmodverdir)
1544
1545 PHONY += $(objtree)/Module.symvers
1546 $(objtree)/Module.symvers:
1547         @test -e $(objtree)/Module.symvers || ( \
1548         echo; \
1549         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1550         echo "           is missing; modules will have no dependencies and modversions."; \
1551         echo )
1552
1553 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1554 PHONY += $(module-dirs) modules
1555 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1556         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1557
1558 modules: $(module-dirs)
1559         @$(kecho) '  Building modules, stage 2.';
1560         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1561
1562 PHONY += modules_install
1563 modules_install: _emodinst_ _emodinst_post
1564
1565 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1566 PHONY += _emodinst_
1567 _emodinst_:
1568         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1569         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1570
1571 PHONY += _emodinst_post
1572 _emodinst_post: _emodinst_
1573         $(call cmd,depmod)
1574
1575 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1576
1577 PHONY += $(clean-dirs) clean
1578 $(clean-dirs):
1579         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1580
1581 clean:  rm-dirs := $(MODVERDIR)
1582 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1583
1584 PHONY += help
1585 help:
1586         @echo  '  Building external modules.'
1587         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1588         @echo  ''
1589         @echo  '  modules         - default target, build the module(s)'
1590         @echo  '  modules_install - install the module'
1591         @echo  '  clean           - remove generated files in module directory only'
1592         @echo  ''
1593
1594 # Dummies...
1595 PHONY += prepare scripts
1596 prepare: ;
1597 scripts: ;
1598 endif # KBUILD_EXTMOD
1599
1600 clean: $(clean-dirs)
1601         $(call cmd,rmdirs)
1602         $(call cmd,rmfiles)
1603         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1604                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1605                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1606                 -o -name '*.dwo' -o -name '*.lst' \
1607                 -o -name '*.su'  \
1608                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1609                 -o -name '*.symtypes' -o -name 'modules.order' \
1610                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1611                 -o -name .cache.mk \
1612                 -o -name '*.c.[012]*.*' \
1613                 -o -name '*.ll' \
1614                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1615
1616 # Generate tags for editors
1617 # ---------------------------------------------------------------------------
1618 quiet_cmd_tags = GEN     $@
1619       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1620
1621 tags TAGS cscope gtags: FORCE
1622         $(call cmd,tags)
1623
1624 # Scripts to check various things for consistency
1625 # ---------------------------------------------------------------------------
1626
1627 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1628
1629 includecheck:
1630         find $(srctree)/* $(RCS_FIND_IGNORE) \
1631                 -name '*.[hcS]' -type f -print | sort \
1632                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1633
1634 versioncheck:
1635         find $(srctree)/* $(RCS_FIND_IGNORE) \
1636                 -name '*.[hcS]' -type f -print | sort \
1637                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1638
1639 coccicheck:
1640         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1641
1642 namespacecheck:
1643         $(PERL) $(srctree)/scripts/namespace.pl
1644
1645 export_report:
1646         $(PERL) $(srctree)/scripts/export_report.pl
1647
1648 endif #ifeq ($(config-targets),1)
1649 endif #ifeq ($(mixed-targets),1)
1650
1651 PHONY += checkstack kernelrelease kernelversion image_name
1652
1653 # UML needs a little special treatment here.  It wants to use the host
1654 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1655 # else wants $(ARCH), including people doing cross-builds, which means
1656 # that $(SUBARCH) doesn't work here.
1657 ifeq ($(ARCH), um)
1658 CHECKSTACK_ARCH := $(SUBARCH)
1659 else
1660 CHECKSTACK_ARCH := $(ARCH)
1661 endif
1662 checkstack:
1663         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1664         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1665
1666 kernelrelease:
1667         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1668
1669 kernelversion:
1670         @echo $(KERNELVERSION)
1671
1672 image_name:
1673         @echo $(KBUILD_IMAGE)
1674
1675 # Clear a bunch of variables before executing the submake
1676 tools/: FORCE
1677         $(Q)mkdir -p $(objtree)/tools
1678         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1679
1680 tools/%: FORCE
1681         $(Q)mkdir -p $(objtree)/tools
1682         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1683
1684 # Single targets
1685 # ---------------------------------------------------------------------------
1686 # Single targets are compatible with:
1687 # - build with mixed source and output
1688 # - build with separate output dir 'make O=...'
1689 # - external modules
1690 #
1691 #  target-dir => where to store outputfile
1692 #  build-dir  => directory in kernel source tree to use
1693
1694 ifeq ($(KBUILD_EXTMOD),)
1695         build-dir  = $(patsubst %/,%,$(dir $@))
1696         target-dir = $(dir $@)
1697 else
1698         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1699         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1700         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1701 endif
1702
1703 %.s: %.c prepare scripts FORCE
1704         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1705 %.i: %.c prepare scripts FORCE
1706         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1707 %.o: %.c prepare scripts FORCE
1708         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1709 %.lst: %.c prepare scripts FORCE
1710         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1711 %.s: %.S prepare scripts FORCE
1712         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1713 %.o: %.S prepare scripts FORCE
1714         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1715 %.symtypes: %.c prepare scripts FORCE
1716         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1717 %.ll: %.c prepare scripts FORCE
1718         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1719
1720 # Modules
1721 /: prepare scripts FORCE
1722         $(cmd_crmodverdir)
1723         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1724         $(build)=$(build-dir)
1725 # Make sure the latest headers are built for Documentation
1726 Documentation/ samples/: headers_install
1727 %/: prepare scripts FORCE
1728         $(cmd_crmodverdir)
1729         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1730         $(build)=$(build-dir)
1731 %.ko: prepare scripts FORCE
1732         $(cmd_crmodverdir)
1733         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1734         $(build)=$(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                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
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 all saved command lines
1757
1758 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1759
1760 ifneq ($(cmd_files),)
1761   $(cmd_files): ;       # Do not try to update included dependency files
1762   include $(cmd_files)
1763 endif
1764
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)