Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 15
   4 SUBLEVEL = 9
   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)
 373 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
 374 HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
 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) $(CLANG_GCC_TC)
 515 endif
 516
 517 ifeq ($(config-targets),1)
 518 # ===========================================================================
 519 # *config targets only - make sure prerequisites are updated, and descend
 520 # in scripts/kconfig to make the *config target
 521
 522 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 523 # KBUILD_DEFCONFIG may point out an alternative default configuration
 524 # used for 'make defconfig'
 525 include arch/$(SRCARCH)/Makefile
 526 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 527
 528 config: scripts_basic outputmakefile FORCE
 529         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 530
 531 %config: scripts_basic outputmakefile FORCE
 532         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 533
 534 else
 535 # ===========================================================================
 536 # Build targets only - this includes vmlinux, arch specific targets, clean
 537 # targets and others. In general all targets except *config targets.
 538
 539 # If building an external module we do not care about the all: rule
 540 # but instead _all depend on modules
 541 PHONY += all
 542 ifeq ($(KBUILD_EXTMOD),)
 543 _all: all
 544 else
 545 _all: modules
 546 endif
 547
 548 # Decide whether to build built-in, modular, or both.
 549 # Normally, just do built-in.
 550
 551 KBUILD_MODULES :=
 552 KBUILD_BUILTIN := 1
 553
 554 # If we have only "make modules", don't compile built-in objects.
 555 # When we're building modules with modversions, we need to consider
 556 # the built-in objects during the descend as well, in order to
 557 # make sure the checksums are up to date before we record them.
 558
 559 ifeq ($(MAKECMDGOALS),modules)
 560   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 561 endif
 562
 563 # If we have "make <whatever> modules", compile modules
 564 # in addition to whatever we do anyway.
 565 # Just "make" or "make all" shall build modules as well
 566
 567 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 568   KBUILD_MODULES := 1
 569 endif
 570
 571 ifeq ($(MAKECMDGOALS),)
 572   KBUILD_MODULES := 1
 573 endif
 574
 575 export KBUILD_MODULES KBUILD_BUILTIN
 576
 577 ifeq ($(KBUILD_EXTMOD),)
 578 # Additional helpers built in scripts/
 579 # Carefully list dependencies so we do not try to build scripts twice
 580 # in parallel
 581 PHONY += scripts
 582 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 583          asm-generic gcc-plugins
 584         $(Q)$(MAKE) $(build)=$(@)
 585
 586 # Objects we will link into vmlinux / subdirs we need to visit
 587 init-y          := init/
 588 drivers-y       := drivers/ sound/ firmware/ ubuntu/
 589 net-y           := net/
 590 libs-y          := lib/
 591 core-y          := usr/
 592 virt-y          := virt/
 593 endif # KBUILD_EXTMOD
 594
 595 ifeq ($(dot-config),1)
 596 # Read in config
 597 -include include/config/auto.conf
 598
 599 ifeq ($(KBUILD_EXTMOD),)
 600 # Read in dependencies to all Kconfig* files, make sure to run
 601 # oldconfig if changes are detected.
 602 -include include/config/auto.conf.cmd
 603
 604 # To avoid any implicit rule to kick in, define an empty command
 605 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 606
 607 # If .config is newer than include/config/auto.conf, someone tinkered
 608 # with it and forgot to run make oldconfig.
 609 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 610 # we execute the config step to be sure to catch updated Kconfig files
 611 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 612         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 613 else
 614 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 615 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 616 PHONY += include/config/auto.conf
 617
 618 include/config/auto.conf:
 619         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 620         echo >&2;                                                       \
 621         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 622         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 623         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 624         echo >&2 ;                                                      \
 625         /bin/false)
 626
 627 endif # KBUILD_EXTMOD
 628
 629 else
 630 # Dummy target needed, because used as prerequisite
 631 include/config/auto.conf: ;
 632 endif # $(dot-config)
 633
 634 # For the kernel to actually contain only the needed exported symbols,
 635 # we have to build modules as well to determine what those symbols are.
 636 # (this can be evaluated only once include/config/auto.conf has been included)
 637 ifdef CONFIG_TRIM_UNUSED_KSYMS
 638   KBUILD_MODULES := 1
 639 endif
 640
 641 # The all: target is the default when no target is given on the
 642 # command line.
 643 # This allow a user to issue only 'make' to build a kernel including modules
 644 # Defaults to vmlinux, but the arch makefile usually adds further targets
 645 all: vmlinux
 646
 647 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 648 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 649 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 650 export CFLAGS_GCOV CFLAGS_KCOV
 651
 652 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 653 # values of the respective KBUILD_* variables
 654 ARCH_CPPFLAGS :=
 655 ARCH_AFLAGS :=
 656 ARCH_CFLAGS :=
 657 include arch/$(SRCARCH)/Makefile
 658
 659 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 660 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 661 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 662 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 663 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 664
 665 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 666 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 667 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 668 else
 669 ifdef CONFIG_PROFILE_ALL_BRANCHES
 670 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 671 else
 672 KBUILD_CFLAGS   += -O2
 673 endif
 674 endif
 675
 676 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 677                         $(call cc-disable-warning,maybe-uninitialized,))
 678
 679 # Tell gcc to never replace conditional load with a non-conditional one
 680 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 681
 682 # check for 'asm goto'
 683 ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 684         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 685         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 686 endif
 687
 688 include scripts/Makefile.kcov
 689 include scripts/Makefile.gcc-plugins
 690
 691 ifdef CONFIG_READABLE_ASM
 692 # Disable optimizations that make assembler listings hard to read.
 693 # reorder blocks reorders the control in the function
 694 # ipa clone creates specialized cloned functions
 695 # partial inlining inlines only parts of functions
 696 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 697                  $(call cc-option,-fno-ipa-cp-clone,) \
 698                  $(call cc-option,-fno-partial-inlining)
 699 endif
 700
 701 ifneq ($(CONFIG_FRAME_WARN),0)
 702 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 703 endif
 704
 705 # This selects the stack protector compiler flag. Testing it is delayed
 706 # until after .config has been reprocessed, in the prepare-compiler-check
 707 # target.
 708 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 709   stackp-flag := -fstack-protector
 710   stackp-name := REGULAR
 711 else
 712 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 713   stackp-flag := -fstack-protector-strong
 714   stackp-name := STRONG
 715 else
 716   # Force off for distro compilers that enable stack protector by default.
 717   stackp-flag := $(call cc-option, -fno-stack-protector)
 718 endif
 719 endif
 720 # Find arch-specific stack protector compiler sanity-checking script.
 721 ifdef CONFIG_CC_STACKPROTECTOR
 722   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 723   stackp-check := $(wildcard $(stackp-path))
 724 endif
 725 KBUILD_CFLAGS += $(stackp-flag)
 726
 727 ifeq ($(cc-name),clang)
 728 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 729 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 730 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 731 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 732 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 733 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 734 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 735 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 736 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 737 # See modpost pattern 2
 738 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 739 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 740 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 741 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 742 else
 743
 744 # These warnings generated too much noise in a regular build.
 745 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 746 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 747 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 748 endif
 749
 750 ifdef CONFIG_FRAME_POINTER
 751 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 752 else
 753 # Some targets (ARM with Thumb2, for example), can't be built with frame
 754 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 755 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 756 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 757 # -fomit-frame-pointer with FUNCTION_TRACER.
 758 ifndef CONFIG_FUNCTION_TRACER
 759 KBUILD_CFLAGS   += -fomit-frame-pointer
 760 endif
 761 endif
 762
 763 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 764
 765 ifdef CONFIG_DEBUG_INFO
 766 ifdef CONFIG_DEBUG_INFO_SPLIT
 767 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 768 else
 769 KBUILD_CFLAGS   += -g
 770 endif
 771 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 772 endif
 773 ifdef CONFIG_DEBUG_INFO_DWARF4
 774 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 775 endif
 776
 777 ifdef CONFIG_DEBUG_INFO_REDUCED
 778 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 779                    $(call cc-option,-fno-var-tracking)
 780 endif
 781
 782 ifdef CONFIG_FUNCTION_TRACER
 783 ifndef CC_FLAGS_FTRACE
 784 CC_FLAGS_FTRACE := -pg
 785 endif
 786 export CC_FLAGS_FTRACE
 787 ifdef CONFIG_HAVE_FENTRY
 788 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 789 endif
 790 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 791 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 792 ifdef CONFIG_DYNAMIC_FTRACE
 793         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 794                 BUILD_C_RECORDMCOUNT := y
 795                 export BUILD_C_RECORDMCOUNT
 796         endif
 797 endif
 798 endif
 799
 800 # We trigger additional mismatches with less inlining
 801 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 802 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 803 endif
 804
 805 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 806 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 807 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 808 endif
 809
 810 # arch Makefile may override CC so keep this after arch Makefile is included
 811 NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
 812 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 813
 814 # warn about C99 declaration after statement
 815 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 816
 817 # disable pointer signed / unsigned warnings in gcc 4.0
 818 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 819
 820 # disable invalid "can't wrap" optimizations for signed / pointers
 821 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 822
 823 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 824 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 825
 826 # conserve stack if available
 827 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 828
 829 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 830 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 831
 832 # require functions to have arguments in prototypes, not empty 'int foo()'
 833 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 834
 835 # Prohibit date/time macros, which would make the build non-deterministic
 836 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 837
 838 # enforce correct pointer usage
 839 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 840
 841 # Require designated initializers for all marked structures
 842 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 843
 844 # use the deterministic mode of AR if available
 845 KBUILD_ARFLAGS := $(call ar-option,D)
 846
 847 include scripts/Makefile.kasan
 848 include scripts/Makefile.extrawarn
 849 include scripts/Makefile.ubsan
 850
 851 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 852 # last assignments
 853 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 854 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 855 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 856
 857 # Use --build-id when available.
 858 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 859                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 860 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 861 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 862
 863 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 864 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 865 endif
 866
 867 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 868 LDFLAGS_vmlinux += $(call ld-option, -X,)
 869 endif
 870
 871 # Default kernel image to build when no specific target is given.
 872 # KBUILD_IMAGE may be overruled on the command line or
 873 # set in the environment
 874 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 875 # this default value
 876 export KBUILD_IMAGE ?= vmlinux
 877
 878 #
 879 # INSTALL_PATH specifies where to place the updated kernel and system map
 880 # images. Default is /boot, but you can set it to other values
 881 export  INSTALL_PATH ?= /boot
 882
 883 #
 884 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 885 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 886 # an argument if needed. Otherwise it defaults to the kernel install path
 887 #
 888 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 889
 890 #
 891 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 892 # relocations required by build roots.  This is not defined in the
 893 # makefile but the argument can be passed to make if needed.
 894 #
 895
 896 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 897 export MODLIB
 898
 899 #
 900 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 901 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 902 # the default option --strip-debug will be used.  Otherwise,
 903 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 904
 905 ifdef INSTALL_MOD_STRIP
 906 ifeq ($(INSTALL_MOD_STRIP),1)
 907 mod_strip_cmd = $(STRIP) --strip-debug
 908 else
 909 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 910 endif # INSTALL_MOD_STRIP=1
 911 else
 912 mod_strip_cmd = true
 913 endif # INSTALL_MOD_STRIP
 914 export mod_strip_cmd
 915
 916 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 917 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 918 # or CONFIG_MODULE_COMPRESS_XZ.
 919
 920 mod_compress_cmd = true
 921 ifdef CONFIG_MODULE_COMPRESS
 922   ifdef CONFIG_MODULE_COMPRESS_GZIP
 923     mod_compress_cmd = gzip -n -f
 924   endif # CONFIG_MODULE_COMPRESS_GZIP
 925   ifdef CONFIG_MODULE_COMPRESS_XZ
 926     mod_compress_cmd = xz -f
 927   endif # CONFIG_MODULE_COMPRESS_XZ
 928 endif # CONFIG_MODULE_COMPRESS
 929 export mod_compress_cmd
 930
 931 # Select initial ramdisk compression format, default is gzip(1).
 932 # This shall be used by the dracut(8) tool while creating an initramfs image.
 933 #
 934 INITRD_COMPRESS-y                  := gzip
 935 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 936 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 937 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 938 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 939 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 940 # do not export INITRD_COMPRESS, since we didn't actually
 941 # choose a sane default compression above.
 942 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 943
 944 ifdef CONFIG_MODULE_SIG_ALL
 945 $(eval $(call config_filename,MODULE_SIG_KEY))
 946
 947 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 948 else
 949 mod_sign_cmd = true
 950 endif
 951 export mod_sign_cmd
 952
 953 ifdef CONFIG_STACK_VALIDATION
 954   has_libelf := $(call try-run,\
 955                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 956   ifeq ($(has_libelf),1)
 957     objtool_target := tools/objtool FORCE
 958   else
 959     ifdef CONFIG_UNWINDER_ORC
 960       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 961     else
 962       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 963     endif
 964     SKIP_STACK_VALIDATION := 1
 965     export SKIP_STACK_VALIDATION
 966   endif
 967 endif
 968
 969
 970 ifeq ($(KBUILD_EXTMOD),)
 971 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 972
 973 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 974                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 975                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 976
 977 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 978                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 979
 980 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 981 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 982 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 983 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 984 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 985 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
 986 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 987
 988 # Externally visible symbols (used by link-vmlinux.sh)
 989 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 990 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 991 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 992 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 993 export LDFLAGS_vmlinux
 994 # used by scripts/package/Makefile
 995 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 996
 997 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 998
 999 # Include targets which we want to execute sequentially if the rest of the
1000 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1001 # evaluated more than once.
1002 PHONY += vmlinux_prereq
1003 vmlinux_prereq: $(vmlinux-deps) FORCE
1004 ifdef CONFIG_HEADERS_CHECK
1005         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1006 endif
1007 ifdef CONFIG_GDB_SCRIPTS
1008         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1009 endif
1010 ifdef CONFIG_TRIM_UNUSED_KSYMS
1011         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1012           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1013 endif
1014
1015 # standalone target for easier testing
1016 include/generated/autoksyms.h: FORCE
1017         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1018
1019 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1020
1021 # Final link of vmlinux with optional arch pass after final link
1022 cmd_link-vmlinux =                                                 \
1023         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1024         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1025
1026 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1027         +$(call if_changed,link-vmlinux)
1028
1029 # Build samples along the rest of the kernel
1030 ifdef CONFIG_SAMPLES
1031 vmlinux-dirs += samples
1032 endif
1033
1034 # The actual objects are generated when descending,
1035 # make sure no implicit rule kicks in
1036 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1037
1038 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1039 # Preset locale variables to speed up the build process. Limit locale
1040 # tweaks to this spot to avoid wrong language settings when running
1041 # make menuconfig etc.
1042 # Error messages still appears in the original language
1043
1044 PHONY += $(vmlinux-dirs)
1045 $(vmlinux-dirs): prepare scripts
1046         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1047
1048 define filechk_kernel.release
1049         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1050 endef
1051
1052 # Store (new) KERNELRELEASE string in include/config/kernel.release
1053 include/config/kernel.release: include/config/auto.conf FORCE
1054         $(call filechk,kernel.release)
1055
1056
1057 # Things we need to do before we recursively start building the kernel
1058 # or the modules are listed in "prepare".
1059 # A multi level approach is used. prepareN is processed before prepareN-1.
1060 # archprepare is used in arch Makefiles and when processed asm symlink,
1061 # version.h and scripts_basic is processed / created.
1062
1063 # Listed in dependency order
1064 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1065
1066 # prepare3 is used to check if we are building in a separate output directory,
1067 # and if so do:
1068 # 1) Check that make has not been executed in the kernel src $(srctree)
1069 prepare3: include/config/kernel.release
1070 ifneq ($(KBUILD_SRC),)
1071         @$(kecho) '  Using $(srctree) as source for kernel'
1072         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1073                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1074                 echo >&2 "  in the '$(srctree)' directory.";\
1075                 /bin/false; \
1076         fi;
1077 endif
1078
1079 # prepare2 creates a makefile if using a separate output directory.
1080 # From this point forward, .config has been reprocessed, so any rules
1081 # that need to depend on updated CONFIG_* values can be checked here.
1082 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1083
1084 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1085                    include/config/auto.conf
1086         $(cmd_crmodverdir)
1087
1088 archprepare: archheaders archscripts prepare1 scripts_basic
1089
1090 prepare0: archprepare gcc-plugins
1091         $(Q)$(MAKE) $(build)=.
1092
1093 # All the preparing..
1094 prepare: prepare0 prepare-objtool
1095
1096 # Support for using generic headers in asm-generic
1097 PHONY += asm-generic uapi-asm-generic
1098 asm-generic: uapi-asm-generic
1099         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1100                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1101 uapi-asm-generic:
1102         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1103                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1104
1105 PHONY += prepare-objtool
1106 prepare-objtool: $(objtool_target)
1107
1108 # Check for CONFIG flags that require compiler support. Abort the build
1109 # after .config has been processed, but before the kernel build starts.
1110 #
1111 # For security-sensitive CONFIG options, we don't want to fallback and/or
1112 # silently change which compiler flags will be used, since that leads to
1113 # producing kernels with different security feature characteristics
1114 # depending on the compiler used. (For example, "But I selected
1115 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1116 PHONY += prepare-compiler-check
1117 prepare-compiler-check: FORCE
1118 # Make sure compiler supports requested stack protector flag.
1119 ifdef stackp-name
1120   ifeq ($(call cc-option, $(stackp-flag)),)
1121         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1122                   $(stackp-flag) not supported by compiler >&2 && exit 1
1123   endif
1124 endif
1125 # Make sure compiler does not have buggy stack-protector support.
1126 ifdef stackp-check
1127   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1128         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1129                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1130   endif
1131 endif
1132         @:
1133
1134 # Generate some files
1135 # ---------------------------------------------------------------------------
1136
1137 # KERNELRELEASE can change from a few different places, meaning version.h
1138 # needs to be updated, so this check is forced on all builds
1139
1140 uts_len := 64
1141 define filechk_utsrelease.h
1142         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1143           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1144           exit 1;                                                         \
1145         fi;                                                               \
1146         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1147 endef
1148
1149 define filechk_version.h
1150         (echo \#define LINUX_VERSION_CODE $(shell                         \
1151         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1152         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1153 endef
1154
1155 $(version_h): $(srctree)/Makefile FORCE
1156         $(call filechk,version.h)
1157         $(Q)rm -f $(old_version_h)
1158
1159 include/generated/utsrelease.h: include/config/kernel.release FORCE
1160         $(call filechk,utsrelease.h)
1161
1162 PHONY += headerdep
1163 headerdep:
1164         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1165         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1166
1167 # ---------------------------------------------------------------------------
1168 # Kernel headers
1169
1170 #Default location for installed headers
1171 export INSTALL_HDR_PATH = $(objtree)/usr
1172
1173 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1174 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1175
1176 PHONY += archheaders
1177 archheaders:
1178
1179 PHONY += archscripts
1180 archscripts:
1181
1182 PHONY += __headers
1183 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1184         $(Q)$(MAKE) $(build)=scripts build_unifdef
1185
1186 PHONY += headers_install_all
1187 headers_install_all:
1188         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1189
1190 PHONY += headers_install
1191 headers_install: __headers
1192         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1193           $(error Headers not exportable for the $(SRCARCH) architecture))
1194         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1195         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1196         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1197
1198 PHONY += headers_check_all
1199 headers_check_all: headers_install_all
1200         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1201
1202 PHONY += headers_check
1203 headers_check: headers_install
1204         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1205         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1206         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1207
1208 # ---------------------------------------------------------------------------
1209 # Kernel selftest
1210
1211 PHONY += kselftest
1212 kselftest:
1213         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1214
1215 PHONY += kselftest-clean
1216 kselftest-clean:
1217         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1218
1219 PHONY += kselftest-merge
1220 kselftest-merge:
1221         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1222         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1223                 -m $(objtree)/.config \
1224                 $(srctree)/tools/testing/selftests/*/config
1225         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1226
1227 # ---------------------------------------------------------------------------
1228 # Modules
1229
1230 ifdef CONFIG_MODULES
1231
1232 # By default, build modules as well
1233
1234 all: modules
1235
1236 # Build modules
1237 #
1238 # A module can be listed more than once in obj-m resulting in
1239 # duplicate lines in modules.order files.  Those are removed
1240 # using awk while concatenating to the final file.
1241
1242 PHONY += modules
1243 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1244         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1245         @$(kecho) '  Building modules, stage 2.';
1246         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1247
1248 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1249         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1250
1251 %/modules.builtin: include/config/auto.conf
1252         $(Q)$(MAKE) $(modbuiltin)=$*
1253
1254
1255 # Target to prepare building external modules
1256 PHONY += modules_prepare
1257 modules_prepare: prepare scripts
1258
1259 # Target to install modules
1260 PHONY += modules_install
1261 modules_install: _modinst_ _modinst_post
1262
1263 PHONY += _modinst_
1264 _modinst_:
1265         @rm -rf $(MODLIB)/kernel
1266         @rm -f $(MODLIB)/source
1267         @mkdir -p $(MODLIB)/kernel
1268         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1269         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1270                 rm -f $(MODLIB)/build ; \
1271                 ln -s $(CURDIR) $(MODLIB)/build ; \
1272         fi
1273         @cp -f $(objtree)/modules.order $(MODLIB)/
1274         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1275         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1276
1277 # This depmod is only for convenience to give the initial
1278 # boot a modules.dep even before / is mounted read-write.  However the
1279 # boot script depmod is the master version.
1280 PHONY += _modinst_post
1281 _modinst_post: _modinst_
1282         $(call cmd,depmod)
1283
1284 ifeq ($(CONFIG_MODULE_SIG), y)
1285 PHONY += modules_sign
1286 modules_sign:
1287         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1288 endif
1289
1290 else # CONFIG_MODULES
1291
1292 # Modules not configured
1293 # ---------------------------------------------------------------------------
1294
1295 PHONY += modules modules_install
1296 modules modules_install:
1297         @echo >&2
1298         @echo >&2 "The present kernel configuration has modules disabled."
1299         @echo >&2 "Type 'make config' and enable loadable module support."
1300         @echo >&2 "Then build a kernel with module support enabled."
1301         @echo >&2
1302         @exit 1
1303
1304 endif # CONFIG_MODULES
1305
1306 ###
1307 # Cleaning is done on three levels.
1308 # make clean     Delete most generated files
1309 #                Leave enough to build external modules
1310 # make mrproper  Delete the current configuration, and all generated files
1311 # make distclean Remove editor backup files, patch leftover files and the like
1312
1313 # Directories & files removed with 'make clean'
1314 CLEAN_DIRS  += $(MODVERDIR)
1315
1316 # Directories & files removed with 'make mrproper'
1317 MRPROPER_DIRS  += include/config usr/include include/generated          \
1318                   arch/*/include/generated .tmp_objdiff
1319 MRPROPER_FILES += .config .config.old .version \
1320                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1321                   signing_key.pem signing_key.priv signing_key.x509     \
1322                   x509.genkey extra_certificates signing_key.x509.keyid \
1323                   signing_key.x509.signer vmlinux-gdb.py
1324
1325 # clean - Delete most, but leave enough to build external modules
1326 #
1327 clean: rm-dirs  := $(CLEAN_DIRS)
1328 clean: rm-files := $(CLEAN_FILES)
1329 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1330
1331 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1332 $(clean-dirs):
1333         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1334
1335 vmlinuxclean:
1336         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1337         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1338
1339 clean: archclean vmlinuxclean
1340
1341 # mrproper - Delete all generated files, including .config
1342 #
1343 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1344 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1345 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1346
1347 PHONY += $(mrproper-dirs) mrproper archmrproper
1348 $(mrproper-dirs):
1349         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1350
1351 mrproper: clean archmrproper $(mrproper-dirs)
1352         $(call cmd,rmdirs)
1353         $(call cmd,rmfiles)
1354
1355 # distclean
1356 #
1357 PHONY += distclean
1358
1359 distclean: mrproper
1360         @find $(srctree) $(RCS_FIND_IGNORE) \
1361                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1362                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1363                 -o -name 'core' \) \
1364                 -type f -print | xargs rm -f
1365
1366
1367 # Packaging of the kernel to various formats
1368 # ---------------------------------------------------------------------------
1369 # rpm target kept for backward compatibility
1370 package-dir     := scripts/package
1371
1372 %src-pkg: FORCE
1373         $(Q)$(MAKE) $(build)=$(package-dir) $@
1374 %pkg: include/config/kernel.release FORCE
1375         $(Q)$(MAKE) $(build)=$(package-dir) $@
1376 rpm: rpm-pkg
1377         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1378         @echo "           Please use \"rpm-pkg\" instead."
1379
1380
1381 # Brief documentation of the typical targets used
1382 # ---------------------------------------------------------------------------
1383
1384 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1385 boards := $(sort $(notdir $(boards)))
1386 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1387 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1388
1389 PHONY += help
1390 help:
1391         @echo  'Cleaning targets:'
1392         @echo  '  clean           - Remove most generated files but keep the config and'
1393         @echo  '                    enough build support to build external modules'
1394         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1395         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1396         @echo  ''
1397         @echo  'Configuration targets:'
1398         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1399         @echo  ''
1400         @echo  'Other generic targets:'
1401         @echo  '  all             - Build all targets marked with [*]'
1402         @echo  '* vmlinux         - Build the bare kernel'
1403         @echo  '* modules         - Build all modules'
1404         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1405         @echo  '  dir/            - Build all files in dir and below'
1406         @echo  '  dir/file.[ois]  - Build specified target only'
1407         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1408         @echo  '                    (requires compiler support for LLVM assembly generation)'
1409         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1410         @echo  '                    (requires a recent binutils and recent build (System.map))'
1411         @echo  '  dir/file.ko     - Build module including final link'
1412         @echo  '  modules_prepare - Set up for building external modules'
1413         @echo  '  tags/TAGS       - Generate tags file for editors'
1414         @echo  '  cscope          - Generate cscope index'
1415         @echo  '  gtags           - Generate GNU GLOBAL index'
1416         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1417         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1418         @echo  '  image_name      - Output the image name (use with make -s)'
1419         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1420          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1421          echo  ''
1422         @echo  'Static analysers:'
1423         @echo  '  checkstack      - Generate a list of stack hogs'
1424         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1425         @echo  '  versioncheck    - Sanity check on version.h usage'
1426         @echo  '  includecheck    - Check for duplicate included header files'
1427         @echo  '  export_report   - List the usages of all exported symbols'
1428         @echo  '  headers_check   - Sanity check on exported headers'
1429         @echo  '  headerdep       - Detect inclusion cycles in headers'
1430         @echo  '  coccicheck      - Check with Coccinelle'
1431         @echo  ''
1432         @echo  'Kernel selftest:'
1433         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1434         @echo  '                    Build, install, and boot kernel before'
1435         @echo  '                    running kselftest on it'
1436         @echo  '  kselftest-clean - Remove all generated kselftest files'
1437         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1438         @echo  '                    .config.'
1439         @echo  ''
1440         @echo 'Userspace tools targets:'
1441         @echo '  use "make tools/help"'
1442         @echo '  or  "cd tools; make help"'
1443         @echo  ''
1444         @echo  'Kernel packaging:'
1445         @$(MAKE) $(build)=$(package-dir) help
1446         @echo  ''
1447         @echo  'Documentation targets:'
1448         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1449         @echo  ''
1450         @echo  'Architecture specific targets ($(SRCARCH)):'
1451         @$(if $(archhelp),$(archhelp),\
1452                 echo '  No architecture specific help defined for $(SRCARCH)')
1453         @echo  ''
1454         @$(if $(boards), \
1455                 $(foreach b, $(boards), \
1456                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1457                 echo '')
1458         @$(if $(board-dirs), \
1459                 $(foreach b, $(board-dirs), \
1460                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1461                 printf "  %-16s - Show all of the above\\n" help-boards; \
1462                 echo '')
1463
1464         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1465         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1466         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1467         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1468         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1469         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1470         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1471         @echo  '                1: warnings which may be relevant and do not occur too often'
1472         @echo  '                2: warnings which occur quite often but may still be relevant'
1473         @echo  '                3: more obscure warnings, can most likely be ignored'
1474         @echo  '                Multiple levels can be combined with W=12 or W=123'
1475         @echo  ''
1476         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1477         @echo  'For further info see the ./README file'
1478
1479
1480 help-board-dirs := $(addprefix help-,$(board-dirs))
1481
1482 help-boards: $(help-board-dirs)
1483
1484 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1485
1486 $(help-board-dirs): help-%:
1487         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1488         @$(if $(boards-per-dir), \
1489                 $(foreach b, $(boards-per-dir), \
1490                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1491                 echo '')
1492
1493
1494 # Documentation targets
1495 # ---------------------------------------------------------------------------
1496 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1497                linkcheckdocs dochelp refcheckdocs
1498 PHONY += $(DOC_TARGETS)
1499 $(DOC_TARGETS): scripts_basic FORCE
1500         $(Q)$(MAKE) $(build)=Documentation $@
1501
1502 else # KBUILD_EXTMOD
1503
1504 ###
1505 # External module support.
1506 # When building external modules the kernel used as basis is considered
1507 # read-only, and no consistency checks are made and the make
1508 # system is not used on the basis kernel. If updates are required
1509 # in the basis kernel ordinary make commands (without M=...) must
1510 # be used.
1511 #
1512 # The following are the only valid targets when building external
1513 # modules.
1514 # make M=dir clean     Delete all automatically generated files
1515 # make M=dir modules   Make all modules in specified dir
1516 # make M=dir           Same as 'make M=dir modules'
1517 # make M=dir modules_install
1518 #                      Install the modules built in the module directory
1519 #                      Assumes install directory is already created
1520
1521 # We are always building modules
1522 KBUILD_MODULES := 1
1523 PHONY += crmodverdir
1524 crmodverdir:
1525         $(cmd_crmodverdir)
1526
1527 PHONY += $(objtree)/Module.symvers
1528 $(objtree)/Module.symvers:
1529         @test -e $(objtree)/Module.symvers || ( \
1530         echo; \
1531         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1532         echo "           is missing; modules will have no dependencies and modversions."; \
1533         echo )
1534
1535 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1536 PHONY += $(module-dirs) modules
1537 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1538         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1539
1540 modules: $(module-dirs)
1541         @$(kecho) '  Building modules, stage 2.';
1542         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1543
1544 PHONY += modules_install
1545 modules_install: _emodinst_ _emodinst_post
1546
1547 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1548 PHONY += _emodinst_
1549 _emodinst_:
1550         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1551         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1552
1553 PHONY += _emodinst_post
1554 _emodinst_post: _emodinst_
1555         $(call cmd,depmod)
1556
1557 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1558
1559 PHONY += $(clean-dirs) clean
1560 $(clean-dirs):
1561         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1562
1563 clean:  rm-dirs := $(MODVERDIR)
1564 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1565
1566 PHONY += help
1567 help:
1568         @echo  '  Building external modules.'
1569         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1570         @echo  ''
1571         @echo  '  modules         - default target, build the module(s)'
1572         @echo  '  modules_install - install the module'
1573         @echo  '  clean           - remove generated files in module directory only'
1574         @echo  ''
1575
1576 # Dummies...
1577 PHONY += prepare scripts
1578 prepare: ;
1579 scripts: ;
1580 endif # KBUILD_EXTMOD
1581
1582 clean: $(clean-dirs)
1583         $(call cmd,rmdirs)
1584         $(call cmd,rmfiles)
1585         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1586                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1587                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1588                 -o -name '*.dwo' -o -name '*.lst' \
1589                 -o -name '*.su'  \
1590                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1591                 -o -name '*.symtypes' -o -name 'modules.order' \
1592                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1593                 -o -name .cache.mk \
1594                 -o -name '*.c.[012]*.*' \
1595                 -o -name '*.ll' \
1596                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1597
1598 # Generate tags for editors
1599 # ---------------------------------------------------------------------------
1600 quiet_cmd_tags = GEN     $@
1601       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1602
1603 tags TAGS cscope gtags: FORCE
1604         $(call cmd,tags)
1605
1606 # Scripts to check various things for consistency
1607 # ---------------------------------------------------------------------------
1608
1609 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1610
1611 includecheck:
1612         find $(srctree)/* $(RCS_FIND_IGNORE) \
1613                 -name '*.[hcS]' -type f -print | sort \
1614                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1615
1616 versioncheck:
1617         find $(srctree)/* $(RCS_FIND_IGNORE) \
1618                 -name '*.[hcS]' -type f -print | sort \
1619                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1620
1621 coccicheck:
1622         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1623
1624 namespacecheck:
1625         $(PERL) $(srctree)/scripts/namespace.pl
1626
1627 export_report:
1628         $(PERL) $(srctree)/scripts/export_report.pl
1629
1630 endif #ifeq ($(config-targets),1)
1631 endif #ifeq ($(mixed-targets),1)
1632
1633 PHONY += checkstack kernelrelease kernelversion image_name
1634
1635 # UML needs a little special treatment here.  It wants to use the host
1636 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1637 # else wants $(ARCH), including people doing cross-builds, which means
1638 # that $(SUBARCH) doesn't work here.
1639 ifeq ($(ARCH), um)
1640 CHECKSTACK_ARCH := $(SUBARCH)
1641 else
1642 CHECKSTACK_ARCH := $(ARCH)
1643 endif
1644 checkstack:
1645         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1646         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1647
1648 kernelrelease:
1649         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1650
1651 kernelversion:
1652         @echo $(KERNELVERSION)
1653
1654 image_name:
1655         @echo $(KBUILD_IMAGE)
1656
1657 # Clear a bunch of variables before executing the submake
1658 tools/: FORCE
1659         $(Q)mkdir -p $(objtree)/tools
1660         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1661
1662 tools/%: FORCE
1663         $(Q)mkdir -p $(objtree)/tools
1664         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1665
1666 # Single targets
1667 # ---------------------------------------------------------------------------
1668 # Single targets are compatible with:
1669 # - build with mixed source and output
1670 # - build with separate output dir 'make O=...'
1671 # - external modules
1672 #
1673 #  target-dir => where to store outputfile
1674 #  build-dir  => directory in kernel source tree to use
1675
1676 ifeq ($(KBUILD_EXTMOD),)
1677         build-dir  = $(patsubst %/,%,$(dir $@))
1678         target-dir = $(dir $@)
1679 else
1680         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1681         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1682         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1683 endif
1684
1685 %.s: %.c prepare scripts FORCE
1686         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1687 %.i: %.c prepare scripts FORCE
1688         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1689 %.o: %.c prepare scripts FORCE
1690         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1691 %.lst: %.c prepare scripts FORCE
1692         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1693 %.s: %.S prepare scripts FORCE
1694         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1695 %.o: %.S prepare scripts FORCE
1696         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1697 %.symtypes: %.c prepare scripts FORCE
1698         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1699 %.ll: %.c prepare scripts FORCE
1700         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1701
1702 # Modules
1703 /: prepare scripts FORCE
1704         $(cmd_crmodverdir)
1705         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1706         $(build)=$(build-dir)
1707 # Make sure the latest headers are built for Documentation
1708 Documentation/ samples/: headers_install
1709 %/: prepare scripts FORCE
1710         $(cmd_crmodverdir)
1711         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1712         $(build)=$(build-dir)
1713 %.ko: prepare scripts FORCE
1714         $(cmd_crmodverdir)
1715         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1716         $(build)=$(build-dir) $(@:.ko=.o)
1717         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1718
1719 # FIXME Should go into a make.lib or something
1720 # ===========================================================================
1721
1722 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1723       cmd_rmdirs = rm -rf $(rm-dirs)
1724
1725 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1726       cmd_rmfiles = rm -f $(rm-files)
1727
1728 # Run depmod only if we have System.map and depmod is executable
1729 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1730       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1731                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1732
1733 # Create temporary dir for module support files
1734 # clean it up only when building all modules
1735 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1736                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1737
1738 # read all saved command lines
1739
1740 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1741
1742 ifneq ($(cmd_files),)
1743   $(cmd_files): ;       # Do not try to update included dependency files
1744   include $(cmd_files)
1745 endif
1746
1747 endif   # skip-makefile
1748
1749 PHONY += FORCE
1750 FORCE:
1751
1752 # Declare the contents of the .PHONY variable as phony.  We keep that
1753 # information in a variable so we can use it in if_changed and friends.
1754 .PHONY: $(PHONY)