Makefile

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