Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 15
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc3
   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 CFLAGS_KASAN CFLAGS_UBSAN
 436 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 437 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 438 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 439 export KBUILD_ARFLAGS
 440
 441 # When compiling out-of-tree modules, put MODVERDIR in the module
 442 # tree rather than in the kernel tree. The kernel tree might
 443 # even be read-only.
 444 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 445
 446 # Files to ignore in find ... statements
 447
 448 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 449                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 450                           -prune -o
 451 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 452                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 453
 454 # ===========================================================================
 455 # Rules shared between *config targets and build targets
 456
 457 # Basic helpers built in scripts/basic/
 458 PHONY += scripts_basic
 459 scripts_basic:
 460         $(Q)$(MAKE) $(build)=scripts/basic
 461         $(Q)rm -f .tmp_quiet_recordmcount
 462
 463 # To avoid any implicit rule to kick in, define an empty command.
 464 scripts/basic/%: scripts_basic ;
 465
 466 PHONY += outputmakefile
 467 # outputmakefile generates a Makefile in the output directory, if using a
 468 # separate output directory. This allows convenient use of make in the
 469 # output directory.
 470 outputmakefile:
 471 ifneq ($(KBUILD_SRC),)
 472         $(Q)ln -fsn $(srctree) source
 473         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 474             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 475 endif
 476
 477 ifeq ($(cc-name),clang)
 478 ifneq ($(CROSS_COMPILE),)
 479 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 480 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 481 endif
 482 ifneq ($(GCC_TOOLCHAIN),)
 483 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 484 endif
 485 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 486 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 487 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 488 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 489 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 490 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 491 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 492 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 493 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 494 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 495 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 496 # See modpost pattern 2
 497 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 498 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 499 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 500 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 501 else
 502
 503 # These warnings generated too much noise in a regular build.
 504 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 505 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 506 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 507 endif
 508
 509 ifeq ($(config-targets),1)
 510 # ===========================================================================
 511 # *config targets only - make sure prerequisites are updated, and descend
 512 # in scripts/kconfig to make the *config target
 513
 514 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 515 # KBUILD_DEFCONFIG may point out an alternative default configuration
 516 # used for 'make defconfig'
 517 include arch/$(SRCARCH)/Makefile
 518 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 519
 520 config: scripts_basic outputmakefile FORCE
 521         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 522
 523 %config: scripts_basic outputmakefile FORCE
 524         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 525
 526 else
 527 # ===========================================================================
 528 # Build targets only - this includes vmlinux, arch specific targets, clean
 529 # targets and others. In general all targets except *config targets.
 530
 531 # If building an external module we do not care about the all: rule
 532 # but instead _all depend on modules
 533 PHONY += all
 534 ifeq ($(KBUILD_EXTMOD),)
 535 _all: all
 536 else
 537 _all: modules
 538 endif
 539
 540 # Decide whether to build built-in, modular, or both.
 541 # Normally, just do built-in.
 542
 543 KBUILD_MODULES :=
 544 KBUILD_BUILTIN := 1
 545
 546 # If we have only "make modules", don't compile built-in objects.
 547 # When we're building modules with modversions, we need to consider
 548 # the built-in objects during the descend as well, in order to
 549 # make sure the checksums are up to date before we record them.
 550
 551 ifeq ($(MAKECMDGOALS),modules)
 552   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 553 endif
 554
 555 # If we have "make <whatever> modules", compile modules
 556 # in addition to whatever we do anyway.
 557 # Just "make" or "make all" shall build modules as well
 558
 559 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 560   KBUILD_MODULES := 1
 561 endif
 562
 563 ifeq ($(MAKECMDGOALS),)
 564   KBUILD_MODULES := 1
 565 endif
 566
 567 export KBUILD_MODULES KBUILD_BUILTIN
 568
 569 ifeq ($(KBUILD_EXTMOD),)
 570 # Additional helpers built in scripts/
 571 # Carefully list dependencies so we do not try to build scripts twice
 572 # in parallel
 573 PHONY += scripts
 574 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 575          asm-generic gcc-plugins
 576         $(Q)$(MAKE) $(build)=$(@)
 577
 578 # Objects we will link into vmlinux / subdirs we need to visit
 579 init-y          := init/
 580 drivers-y       := drivers/ sound/ firmware/
 581 net-y           := net/
 582 libs-y          := lib/
 583 core-y          := usr/
 584 virt-y          := virt/
 585 endif # KBUILD_EXTMOD
 586
 587 ifeq ($(dot-config),1)
 588 # Read in config
 589 -include include/config/auto.conf
 590
 591 ifeq ($(KBUILD_EXTMOD),)
 592 # Read in dependencies to all Kconfig* files, make sure to run
 593 # oldconfig if changes are detected.
 594 -include include/config/auto.conf.cmd
 595
 596 # To avoid any implicit rule to kick in, define an empty command
 597 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 598
 599 # If .config is newer than include/config/auto.conf, someone tinkered
 600 # with it and forgot to run make oldconfig.
 601 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 602 # we execute the config step to be sure to catch updated Kconfig files
 603 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 604         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 605 else
 606 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 607 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 608 PHONY += include/config/auto.conf
 609
 610 include/config/auto.conf:
 611         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 612         echo >&2;                                                       \
 613         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 614         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 615         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 616         echo >&2 ;                                                      \
 617         /bin/false)
 618
 619 endif # KBUILD_EXTMOD
 620
 621 else
 622 # Dummy target needed, because used as prerequisite
 623 include/config/auto.conf: ;
 624 endif # $(dot-config)
 625
 626 # For the kernel to actually contain only the needed exported symbols,
 627 # we have to build modules as well to determine what those symbols are.
 628 # (this can be evaluated only once include/config/auto.conf has been included)
 629 ifdef CONFIG_TRIM_UNUSED_KSYMS
 630   KBUILD_MODULES := 1
 631 endif
 632
 633 # The all: target is the default when no target is given on the
 634 # command line.
 635 # This allow a user to issue only 'make' to build a kernel including modules
 636 # Defaults to vmlinux, but the arch makefile usually adds further targets
 637 all: vmlinux
 638
 639 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 640 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 641 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 642 export CFLAGS_GCOV CFLAGS_KCOV
 643
 644 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 645 # values of the respective KBUILD_* variables
 646 ARCH_CPPFLAGS :=
 647 ARCH_AFLAGS :=
 648 ARCH_CFLAGS :=
 649 include arch/$(SRCARCH)/Makefile
 650
 651 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 652 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 653 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 654 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 655 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 656
 657 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 658 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 659 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 660 else
 661 ifdef CONFIG_PROFILE_ALL_BRANCHES
 662 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 663 else
 664 KBUILD_CFLAGS   += -O2
 665 endif
 666 endif
 667
 668 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 669                         $(call cc-disable-warning,maybe-uninitialized,))
 670
 671 # Tell gcc to never replace conditional load with a non-conditional one
 672 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 673
 674 # check for 'asm goto'
 675 ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 676         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 677         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 678 endif
 679
 680 include scripts/Makefile.kcov
 681 include scripts/Makefile.gcc-plugins
 682
 683 ifdef CONFIG_READABLE_ASM
 684 # Disable optimizations that make assembler listings hard to read.
 685 # reorder blocks reorders the control in the function
 686 # ipa clone creates specialized cloned functions
 687 # partial inlining inlines only parts of functions
 688 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 689                  $(call cc-option,-fno-ipa-cp-clone,) \
 690                  $(call cc-option,-fno-partial-inlining)
 691 endif
 692
 693 ifneq ($(CONFIG_FRAME_WARN),0)
 694 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 695 endif
 696
 697 # This selects the stack protector compiler flag. Testing it is delayed
 698 # until after .config has been reprocessed, in the prepare-compiler-check
 699 # target.
 700 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 701   stackp-flag := -fstack-protector
 702   stackp-name := REGULAR
 703 else
 704 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 705   stackp-flag := -fstack-protector-strong
 706   stackp-name := STRONG
 707 else
 708   # Force off for distro compilers that enable stack protector by default.
 709   stackp-flag := $(call cc-option, -fno-stack-protector)
 710 endif
 711 endif
 712 # Find arch-specific stack protector compiler sanity-checking script.
 713 ifdef CONFIG_CC_STACKPROTECTOR
 714   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 715   stackp-check := $(wildcard $(stackp-path))
 716 endif
 717 KBUILD_CFLAGS += $(stackp-flag)
 718
 719 ifdef CONFIG_FRAME_POINTER
 720 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 721 else
 722 # Some targets (ARM with Thumb2, for example), can't be built with frame
 723 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 724 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 725 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 726 # -fomit-frame-pointer with FUNCTION_TRACER.
 727 ifndef CONFIG_FUNCTION_TRACER
 728 KBUILD_CFLAGS   += -fomit-frame-pointer
 729 endif
 730 endif
 731
 732 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 733
 734 ifdef CONFIG_DEBUG_INFO
 735 ifdef CONFIG_DEBUG_INFO_SPLIT
 736 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 737 else
 738 KBUILD_CFLAGS   += -g
 739 endif
 740 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 741 endif
 742 ifdef CONFIG_DEBUG_INFO_DWARF4
 743 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 744 endif
 745
 746 ifdef CONFIG_DEBUG_INFO_REDUCED
 747 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 748                    $(call cc-option,-fno-var-tracking)
 749 endif
 750
 751 ifdef CONFIG_FUNCTION_TRACER
 752 ifndef CC_FLAGS_FTRACE
 753 CC_FLAGS_FTRACE := -pg
 754 endif
 755 export CC_FLAGS_FTRACE
 756 ifdef CONFIG_HAVE_FENTRY
 757 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 758 endif
 759 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 760 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 761 ifdef CONFIG_DYNAMIC_FTRACE
 762         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 763                 BUILD_C_RECORDMCOUNT := y
 764                 export BUILD_C_RECORDMCOUNT
 765         endif
 766 endif
 767 endif
 768
 769 # We trigger additional mismatches with less inlining
 770 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 771 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 772 endif
 773
 774 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 775 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 776 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 777 endif
 778
 779 # arch Makefile may override CC so keep this after arch Makefile is included
 780 NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
 781 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 782
 783 # warn about C99 declaration after statement
 784 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 785
 786 # disable pointer signed / unsigned warnings in gcc 4.0
 787 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 788
 789 # disable invalid "can't wrap" optimizations for signed / pointers
 790 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 791
 792 # conserve stack if available
 793 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 794
 795 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 796 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 797
 798 # require functions to have arguments in prototypes, not empty 'int foo()'
 799 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 800
 801 # Prohibit date/time macros, which would make the build non-deterministic
 802 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 803
 804 # enforce correct pointer usage
 805 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 806
 807 # Require designated initializers for all marked structures
 808 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 809
 810 # use the deterministic mode of AR if available
 811 KBUILD_ARFLAGS := $(call ar-option,D)
 812
 813 include scripts/Makefile.kasan
 814 include scripts/Makefile.extrawarn
 815 include scripts/Makefile.ubsan
 816
 817 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 818 # last assignments
 819 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 820 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 821 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 822
 823 # Use --build-id when available.
 824 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 825                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 826 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 827 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 828
 829 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 830 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 831 endif
 832
 833 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 834 LDFLAGS_vmlinux += $(call ld-option, -X,)
 835 endif
 836
 837 # Default kernel image to build when no specific target is given.
 838 # KBUILD_IMAGE may be overruled on the command line or
 839 # set in the environment
 840 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 841 # this default value
 842 export KBUILD_IMAGE ?= vmlinux
 843
 844 #
 845 # INSTALL_PATH specifies where to place the updated kernel and system map
 846 # images. Default is /boot, but you can set it to other values
 847 export  INSTALL_PATH ?= /boot
 848
 849 #
 850 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 851 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 852 # an argument if needed. Otherwise it defaults to the kernel install path
 853 #
 854 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 855
 856 #
 857 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 858 # relocations required by build roots.  This is not defined in the
 859 # makefile but the argument can be passed to make if needed.
 860 #
 861
 862 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 863 export MODLIB
 864
 865 #
 866 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 867 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 868 # the default option --strip-debug will be used.  Otherwise,
 869 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 870
 871 ifdef INSTALL_MOD_STRIP
 872 ifeq ($(INSTALL_MOD_STRIP),1)
 873 mod_strip_cmd = $(STRIP) --strip-debug
 874 else
 875 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 876 endif # INSTALL_MOD_STRIP=1
 877 else
 878 mod_strip_cmd = true
 879 endif # INSTALL_MOD_STRIP
 880 export mod_strip_cmd
 881
 882 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 883 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 884 # or CONFIG_MODULE_COMPRESS_XZ.
 885
 886 mod_compress_cmd = true
 887 ifdef CONFIG_MODULE_COMPRESS
 888   ifdef CONFIG_MODULE_COMPRESS_GZIP
 889     mod_compress_cmd = gzip -n -f
 890   endif # CONFIG_MODULE_COMPRESS_GZIP
 891   ifdef CONFIG_MODULE_COMPRESS_XZ
 892     mod_compress_cmd = xz -f
 893   endif # CONFIG_MODULE_COMPRESS_XZ
 894 endif # CONFIG_MODULE_COMPRESS
 895 export mod_compress_cmd
 896
 897 # Select initial ramdisk compression format, default is gzip(1).
 898 # This shall be used by the dracut(8) tool while creating an initramfs image.
 899 #
 900 INITRD_COMPRESS-y                  := gzip
 901 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 902 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 903 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 904 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 905 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 906 # do not export INITRD_COMPRESS, since we didn't actually
 907 # choose a sane default compression above.
 908 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 909
 910 ifdef CONFIG_MODULE_SIG_ALL
 911 $(eval $(call config_filename,MODULE_SIG_KEY))
 912
 913 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 914 else
 915 mod_sign_cmd = true
 916 endif
 917 export mod_sign_cmd
 918
 919 ifdef CONFIG_STACK_VALIDATION
 920   has_libelf := $(call try-run,\
 921                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 922   ifeq ($(has_libelf),1)
 923     objtool_target := tools/objtool FORCE
 924   else
 925     ifdef CONFIG_UNWINDER_ORC
 926       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 927     else
 928       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 929     endif
 930     SKIP_STACK_VALIDATION := 1
 931     export SKIP_STACK_VALIDATION
 932   endif
 933 endif
 934
 935
 936 ifeq ($(KBUILD_EXTMOD),)
 937 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 938
 939 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 940                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 941                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 942
 943 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 944                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 945
 946 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 947 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 948 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 949 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 950 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 951 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
 952 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 953
 954 # Externally visible symbols (used by link-vmlinux.sh)
 955 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 956 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 957 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 958 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 959 export LDFLAGS_vmlinux
 960 # used by scripts/package/Makefile
 961 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 962
 963 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 964
 965 # Include targets which we want to execute sequentially if the rest of the
 966 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 967 # evaluated more than once.
 968 PHONY += vmlinux_prereq
 969 vmlinux_prereq: $(vmlinux-deps) FORCE
 970 ifdef CONFIG_HEADERS_CHECK
 971         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 972 endif
 973 ifdef CONFIG_GDB_SCRIPTS
 974         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
 975 endif
 976 ifdef CONFIG_TRIM_UNUSED_KSYMS
 977         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 978           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 979 endif
 980
 981 # standalone target for easier testing
 982 include/generated/autoksyms.h: FORCE
 983         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 984
 985 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 986
 987 # Final link of vmlinux with optional arch pass after final link
 988 cmd_link-vmlinux =                                                 \
 989         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
 990         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 991
 992 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
 993         +$(call if_changed,link-vmlinux)
 994
 995 # Build samples along the rest of the kernel
 996 ifdef CONFIG_SAMPLES
 997 vmlinux-dirs += samples
 998 endif
 999
1000 # The actual objects are generated when descending,
1001 # make sure no implicit rule kicks in
1002 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1003
1004 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1005 # Preset locale variables to speed up the build process. Limit locale
1006 # tweaks to this spot to avoid wrong language settings when running
1007 # make menuconfig etc.
1008 # Error messages still appears in the original language
1009
1010 PHONY += $(vmlinux-dirs)
1011 $(vmlinux-dirs): prepare scripts
1012         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1013
1014 define filechk_kernel.release
1015         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1016 endef
1017
1018 # Store (new) KERNELRELEASE string in include/config/kernel.release
1019 include/config/kernel.release: include/config/auto.conf FORCE
1020         $(call filechk,kernel.release)
1021
1022
1023 # Things we need to do before we recursively start building the kernel
1024 # or the modules are listed in "prepare".
1025 # A multi level approach is used. prepareN is processed before prepareN-1.
1026 # archprepare is used in arch Makefiles and when processed asm symlink,
1027 # version.h and scripts_basic is processed / created.
1028
1029 # Listed in dependency order
1030 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1031
1032 # prepare3 is used to check if we are building in a separate output directory,
1033 # and if so do:
1034 # 1) Check that make has not been executed in the kernel src $(srctree)
1035 prepare3: include/config/kernel.release
1036 ifneq ($(KBUILD_SRC),)
1037         @$(kecho) '  Using $(srctree) as source for kernel'
1038         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1039                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1040                 echo >&2 "  in the '$(srctree)' directory.";\
1041                 /bin/false; \
1042         fi;
1043 endif
1044
1045 # prepare2 creates a makefile if using a separate output directory.
1046 # From this point forward, .config has been reprocessed, so any rules
1047 # that need to depend on updated CONFIG_* values can be checked here.
1048 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1049
1050 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1051                    include/config/auto.conf
1052         $(cmd_crmodverdir)
1053
1054 archprepare: archheaders archscripts prepare1 scripts_basic
1055
1056 prepare0: archprepare gcc-plugins
1057         $(Q)$(MAKE) $(build)=.
1058
1059 # All the preparing..
1060 prepare: prepare0 prepare-objtool
1061
1062 # Support for using generic headers in asm-generic
1063 PHONY += asm-generic uapi-asm-generic
1064 asm-generic: uapi-asm-generic
1065         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1066                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1067 uapi-asm-generic:
1068         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1069                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1070
1071 PHONY += prepare-objtool
1072 prepare-objtool: $(objtool_target)
1073
1074 # Check for CONFIG flags that require compiler support. Abort the build
1075 # after .config has been processed, but before the kernel build starts.
1076 #
1077 # For security-sensitive CONFIG options, we don't want to fallback and/or
1078 # silently change which compiler flags will be used, since that leads to
1079 # producing kernels with different security feature characteristics
1080 # depending on the compiler used. (For example, "But I selected
1081 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1082 PHONY += prepare-compiler-check
1083 prepare-compiler-check: FORCE
1084 # Make sure compiler supports requested stack protector flag.
1085 ifdef stackp-name
1086   ifeq ($(call cc-option, $(stackp-flag)),)
1087         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1088                   $(stackp-flag) not supported by compiler >&2 && exit 1
1089   endif
1090 endif
1091 # Make sure compiler does not have buggy stack-protector support.
1092 ifdef stackp-check
1093   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1094         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1095                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1096   endif
1097 endif
1098         @:
1099
1100 # Generate some files
1101 # ---------------------------------------------------------------------------
1102
1103 # KERNELRELEASE can change from a few different places, meaning version.h
1104 # needs to be updated, so this check is forced on all builds
1105
1106 uts_len := 64
1107 define filechk_utsrelease.h
1108         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1109           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1110           exit 1;                                                         \
1111         fi;                                                               \
1112         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1113 endef
1114
1115 define filechk_version.h
1116         (echo \#define LINUX_VERSION_CODE $(shell                         \
1117         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1118         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1119 endef
1120
1121 $(version_h): $(srctree)/Makefile FORCE
1122         $(call filechk,version.h)
1123         $(Q)rm -f $(old_version_h)
1124
1125 include/generated/utsrelease.h: include/config/kernel.release FORCE
1126         $(call filechk,utsrelease.h)
1127
1128 PHONY += headerdep
1129 headerdep:
1130         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1131         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1132
1133 # ---------------------------------------------------------------------------
1134 # Kernel headers
1135
1136 #Default location for installed headers
1137 export INSTALL_HDR_PATH = $(objtree)/usr
1138
1139 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1140 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1141
1142 PHONY += archheaders
1143 archheaders:
1144
1145 PHONY += archscripts
1146 archscripts:
1147
1148 PHONY += __headers
1149 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1150         $(Q)$(MAKE) $(build)=scripts build_unifdef
1151
1152 PHONY += headers_install_all
1153 headers_install_all:
1154         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1155
1156 PHONY += headers_install
1157 headers_install: __headers
1158         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1159           $(error Headers not exportable for the $(SRCARCH) architecture))
1160         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1161         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1162
1163 PHONY += headers_check_all
1164 headers_check_all: headers_install_all
1165         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1166
1167 PHONY += headers_check
1168 headers_check: headers_install
1169         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1170         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1171
1172 # ---------------------------------------------------------------------------
1173 # Kernel selftest
1174
1175 PHONY += kselftest
1176 kselftest:
1177         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1178
1179 PHONY += kselftest-clean
1180 kselftest-clean:
1181         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1182
1183 PHONY += kselftest-merge
1184 kselftest-merge:
1185         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1186         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1187                 -m $(objtree)/.config \
1188                 $(srctree)/tools/testing/selftests/*/config
1189         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1190
1191 # ---------------------------------------------------------------------------
1192 # Modules
1193
1194 ifdef CONFIG_MODULES
1195
1196 # By default, build modules as well
1197
1198 all: modules
1199
1200 # Build modules
1201 #
1202 # A module can be listed more than once in obj-m resulting in
1203 # duplicate lines in modules.order files.  Those are removed
1204 # using awk while concatenating to the final file.
1205
1206 PHONY += modules
1207 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1208         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1209         @$(kecho) '  Building modules, stage 2.';
1210         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1211
1212 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1213         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1214
1215 %/modules.builtin: include/config/auto.conf
1216         $(Q)$(MAKE) $(modbuiltin)=$*
1217
1218
1219 # Target to prepare building external modules
1220 PHONY += modules_prepare
1221 modules_prepare: prepare scripts
1222
1223 # Target to install modules
1224 PHONY += modules_install
1225 modules_install: _modinst_ _modinst_post
1226
1227 PHONY += _modinst_
1228 _modinst_:
1229         @rm -rf $(MODLIB)/kernel
1230         @rm -f $(MODLIB)/source
1231         @mkdir -p $(MODLIB)/kernel
1232         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1233         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1234                 rm -f $(MODLIB)/build ; \
1235                 ln -s $(CURDIR) $(MODLIB)/build ; \
1236         fi
1237         @cp -f $(objtree)/modules.order $(MODLIB)/
1238         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1239         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1240
1241 # This depmod is only for convenience to give the initial
1242 # boot a modules.dep even before / is mounted read-write.  However the
1243 # boot script depmod is the master version.
1244 PHONY += _modinst_post
1245 _modinst_post: _modinst_
1246         $(call cmd,depmod)
1247
1248 ifeq ($(CONFIG_MODULE_SIG), y)
1249 PHONY += modules_sign
1250 modules_sign:
1251         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1252 endif
1253
1254 else # CONFIG_MODULES
1255
1256 # Modules not configured
1257 # ---------------------------------------------------------------------------
1258
1259 PHONY += modules modules_install
1260 modules modules_install:
1261         @echo >&2
1262         @echo >&2 "The present kernel configuration has modules disabled."
1263         @echo >&2 "Type 'make config' and enable loadable module support."
1264         @echo >&2 "Then build a kernel with module support enabled."
1265         @echo >&2
1266         @exit 1
1267
1268 endif # CONFIG_MODULES
1269
1270 ###
1271 # Cleaning is done on three levels.
1272 # make clean     Delete most generated files
1273 #                Leave enough to build external modules
1274 # make mrproper  Delete the current configuration, and all generated files
1275 # make distclean Remove editor backup files, patch leftover files and the like
1276
1277 # Directories & files removed with 'make clean'
1278 CLEAN_DIRS  += $(MODVERDIR)
1279
1280 # Directories & files removed with 'make mrproper'
1281 MRPROPER_DIRS  += include/config usr/include include/generated          \
1282                   arch/*/include/generated .tmp_objdiff
1283 MRPROPER_FILES += .config .config.old .version \
1284                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1285                   signing_key.pem signing_key.priv signing_key.x509     \
1286                   x509.genkey extra_certificates signing_key.x509.keyid \
1287                   signing_key.x509.signer vmlinux-gdb.py
1288
1289 # clean - Delete most, but leave enough to build external modules
1290 #
1291 clean: rm-dirs  := $(CLEAN_DIRS)
1292 clean: rm-files := $(CLEAN_FILES)
1293 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1294
1295 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1296 $(clean-dirs):
1297         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1298
1299 vmlinuxclean:
1300         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1301         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1302
1303 clean: archclean vmlinuxclean
1304
1305 # mrproper - Delete all generated files, including .config
1306 #
1307 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1308 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1309 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1310
1311 PHONY += $(mrproper-dirs) mrproper archmrproper
1312 $(mrproper-dirs):
1313         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1314
1315 mrproper: clean archmrproper $(mrproper-dirs)
1316         $(call cmd,rmdirs)
1317         $(call cmd,rmfiles)
1318
1319 # distclean
1320 #
1321 PHONY += distclean
1322
1323 distclean: mrproper
1324         @find $(srctree) $(RCS_FIND_IGNORE) \
1325                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1326                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1327                 -o -name 'core' \) \
1328                 -type f -print | xargs rm -f
1329
1330
1331 # Packaging of the kernel to various formats
1332 # ---------------------------------------------------------------------------
1333 # rpm target kept for backward compatibility
1334 package-dir     := scripts/package
1335
1336 %src-pkg: FORCE
1337         $(Q)$(MAKE) $(build)=$(package-dir) $@
1338 %pkg: include/config/kernel.release FORCE
1339         $(Q)$(MAKE) $(build)=$(package-dir) $@
1340 rpm: rpm-pkg
1341         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1342         @echo "           Please use \"rpm-pkg\" instead."
1343
1344
1345 # Brief documentation of the typical targets used
1346 # ---------------------------------------------------------------------------
1347
1348 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1349 boards := $(sort $(notdir $(boards)))
1350 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1351 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1352
1353 PHONY += help
1354 help:
1355         @echo  'Cleaning targets:'
1356         @echo  '  clean           - Remove most generated files but keep the config and'
1357         @echo  '                    enough build support to build external modules'
1358         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1359         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1360         @echo  ''
1361         @echo  'Configuration targets:'
1362         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1363         @echo  ''
1364         @echo  'Other generic targets:'
1365         @echo  '  all             - Build all targets marked with [*]'
1366         @echo  '* vmlinux         - Build the bare kernel'
1367         @echo  '* modules         - Build all modules'
1368         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1369         @echo  '  dir/            - Build all files in dir and below'
1370         @echo  '  dir/file.[ois]  - Build specified target only'
1371         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1372         @echo  '                    (requires compiler support for LLVM assembly generation)'
1373         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1374         @echo  '                    (requires a recent binutils and recent build (System.map))'
1375         @echo  '  dir/file.ko     - Build module including final link'
1376         @echo  '  modules_prepare - Set up for building external modules'
1377         @echo  '  tags/TAGS       - Generate tags file for editors'
1378         @echo  '  cscope          - Generate cscope index'
1379         @echo  '  gtags           - Generate GNU GLOBAL index'
1380         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1381         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1382         @echo  '  image_name      - Output the image name (use with make -s)'
1383         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1384          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1385          echo  ''
1386         @echo  'Static analysers:'
1387         @echo  '  checkstack      - Generate a list of stack hogs'
1388         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1389         @echo  '  versioncheck    - Sanity check on version.h usage'
1390         @echo  '  includecheck    - Check for duplicate included header files'
1391         @echo  '  export_report   - List the usages of all exported symbols'
1392         @echo  '  headers_check   - Sanity check on exported headers'
1393         @echo  '  headerdep       - Detect inclusion cycles in headers'
1394         @echo  '  coccicheck      - Check with Coccinelle'
1395         @echo  ''
1396         @echo  'Kernel selftest:'
1397         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1398         @echo  '                    Build, install, and boot kernel before'
1399         @echo  '                    running kselftest on it'
1400         @echo  '  kselftest-clean - Remove all generated kselftest files'
1401         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1402         @echo  '                    .config.'
1403         @echo  ''
1404         @echo 'Userspace tools targets:'
1405         @echo '  use "make tools/help"'
1406         @echo '  or  "cd tools; make help"'
1407         @echo  ''
1408         @echo  'Kernel packaging:'
1409         @$(MAKE) $(build)=$(package-dir) help
1410         @echo  ''
1411         @echo  'Documentation targets:'
1412         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1413         @echo  ''
1414         @echo  'Architecture specific targets ($(SRCARCH)):'
1415         @$(if $(archhelp),$(archhelp),\
1416                 echo '  No architecture specific help defined for $(SRCARCH)')
1417         @echo  ''
1418         @$(if $(boards), \
1419                 $(foreach b, $(boards), \
1420                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1421                 echo '')
1422         @$(if $(board-dirs), \
1423                 $(foreach b, $(board-dirs), \
1424                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1425                 printf "  %-16s - Show all of the above\\n" help-boards; \
1426                 echo '')
1427
1428         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1429         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1430         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1431         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1432         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1433         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1434         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1435         @echo  '                1: warnings which may be relevant and do not occur too often'
1436         @echo  '                2: warnings which occur quite often but may still be relevant'
1437         @echo  '                3: more obscure warnings, can most likely be ignored'
1438         @echo  '                Multiple levels can be combined with W=12 or W=123'
1439         @echo  ''
1440         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1441         @echo  'For further info see the ./README file'
1442
1443
1444 help-board-dirs := $(addprefix help-,$(board-dirs))
1445
1446 help-boards: $(help-board-dirs)
1447
1448 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1449
1450 $(help-board-dirs): help-%:
1451         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1452         @$(if $(boards-per-dir), \
1453                 $(foreach b, $(boards-per-dir), \
1454                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1455                 echo '')
1456
1457
1458 # Documentation targets
1459 # ---------------------------------------------------------------------------
1460 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1461                linkcheckdocs dochelp refcheckdocs
1462 PHONY += $(DOC_TARGETS)
1463 $(DOC_TARGETS): scripts_basic FORCE
1464         $(Q)$(MAKE) $(build)=Documentation $@
1465
1466 else # KBUILD_EXTMOD
1467
1468 ###
1469 # External module support.
1470 # When building external modules the kernel used as basis is considered
1471 # read-only, and no consistency checks are made and the make
1472 # system is not used on the basis kernel. If updates are required
1473 # in the basis kernel ordinary make commands (without M=...) must
1474 # be used.
1475 #
1476 # The following are the only valid targets when building external
1477 # modules.
1478 # make M=dir clean     Delete all automatically generated files
1479 # make M=dir modules   Make all modules in specified dir
1480 # make M=dir           Same as 'make M=dir modules'
1481 # make M=dir modules_install
1482 #                      Install the modules built in the module directory
1483 #                      Assumes install directory is already created
1484
1485 # We are always building modules
1486 KBUILD_MODULES := 1
1487 PHONY += crmodverdir
1488 crmodverdir:
1489         $(cmd_crmodverdir)
1490
1491 PHONY += $(objtree)/Module.symvers
1492 $(objtree)/Module.symvers:
1493         @test -e $(objtree)/Module.symvers || ( \
1494         echo; \
1495         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1496         echo "           is missing; modules will have no dependencies and modversions."; \
1497         echo )
1498
1499 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1500 PHONY += $(module-dirs) modules
1501 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1502         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1503
1504 modules: $(module-dirs)
1505         @$(kecho) '  Building modules, stage 2.';
1506         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1507
1508 PHONY += modules_install
1509 modules_install: _emodinst_ _emodinst_post
1510
1511 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1512 PHONY += _emodinst_
1513 _emodinst_:
1514         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1515         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1516
1517 PHONY += _emodinst_post
1518 _emodinst_post: _emodinst_
1519         $(call cmd,depmod)
1520
1521 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1522
1523 PHONY += $(clean-dirs) clean
1524 $(clean-dirs):
1525         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1526
1527 clean:  rm-dirs := $(MODVERDIR)
1528 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1529
1530 PHONY += help
1531 help:
1532         @echo  '  Building external modules.'
1533         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1534         @echo  ''
1535         @echo  '  modules         - default target, build the module(s)'
1536         @echo  '  modules_install - install the module'
1537         @echo  '  clean           - remove generated files in module directory only'
1538         @echo  ''
1539
1540 # Dummies...
1541 PHONY += prepare scripts
1542 prepare: ;
1543 scripts: ;
1544 endif # KBUILD_EXTMOD
1545
1546 clean: $(clean-dirs)
1547         $(call cmd,rmdirs)
1548         $(call cmd,rmfiles)
1549         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1550                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1551                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1552                 -o -name '*.dwo' -o -name '*.lst' \
1553                 -o -name '*.su'  \
1554                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1555                 -o -name '*.symtypes' -o -name 'modules.order' \
1556                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1557                 -o -name .cache.mk \
1558                 -o -name '*.c.[012]*.*' \
1559                 -o -name '*.ll' \
1560                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1561
1562 # Generate tags for editors
1563 # ---------------------------------------------------------------------------
1564 quiet_cmd_tags = GEN     $@
1565       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1566
1567 tags TAGS cscope gtags: FORCE
1568         $(call cmd,tags)
1569
1570 # Scripts to check various things for consistency
1571 # ---------------------------------------------------------------------------
1572
1573 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1574
1575 includecheck:
1576         find $(srctree)/* $(RCS_FIND_IGNORE) \
1577                 -name '*.[hcS]' -type f -print | sort \
1578                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1579
1580 versioncheck:
1581         find $(srctree)/* $(RCS_FIND_IGNORE) \
1582                 -name '*.[hcS]' -type f -print | sort \
1583                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1584
1585 coccicheck:
1586         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1587
1588 namespacecheck:
1589         $(PERL) $(srctree)/scripts/namespace.pl
1590
1591 export_report:
1592         $(PERL) $(srctree)/scripts/export_report.pl
1593
1594 endif #ifeq ($(config-targets),1)
1595 endif #ifeq ($(mixed-targets),1)
1596
1597 PHONY += checkstack kernelrelease kernelversion image_name
1598
1599 # UML needs a little special treatment here.  It wants to use the host
1600 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1601 # else wants $(ARCH), including people doing cross-builds, which means
1602 # that $(SUBARCH) doesn't work here.
1603 ifeq ($(ARCH), um)
1604 CHECKSTACK_ARCH := $(SUBARCH)
1605 else
1606 CHECKSTACK_ARCH := $(ARCH)
1607 endif
1608 checkstack:
1609         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1610         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1611
1612 kernelrelease:
1613         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1614
1615 kernelversion:
1616         @echo $(KERNELVERSION)
1617
1618 image_name:
1619         @echo $(KBUILD_IMAGE)
1620
1621 # Clear a bunch of variables before executing the submake
1622 tools/: FORCE
1623         $(Q)mkdir -p $(objtree)/tools
1624         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1625
1626 tools/%: FORCE
1627         $(Q)mkdir -p $(objtree)/tools
1628         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1629
1630 # Single targets
1631 # ---------------------------------------------------------------------------
1632 # Single targets are compatible with:
1633 # - build with mixed source and output
1634 # - build with separate output dir 'make O=...'
1635 # - external modules
1636 #
1637 #  target-dir => where to store outputfile
1638 #  build-dir  => directory in kernel source tree to use
1639
1640 ifeq ($(KBUILD_EXTMOD),)
1641         build-dir  = $(patsubst %/,%,$(dir $@))
1642         target-dir = $(dir $@)
1643 else
1644         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1645         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1646         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1647 endif
1648
1649 %.s: %.c prepare scripts FORCE
1650         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1651 %.i: %.c prepare scripts FORCE
1652         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1653 %.o: %.c prepare scripts FORCE
1654         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1655 %.lst: %.c prepare scripts FORCE
1656         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1657 %.s: %.S prepare scripts FORCE
1658         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1659 %.o: %.S prepare scripts FORCE
1660         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1661 %.symtypes: %.c prepare scripts FORCE
1662         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1663 %.ll: %.c prepare scripts FORCE
1664         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1665
1666 # Modules
1667 /: prepare scripts FORCE
1668         $(cmd_crmodverdir)
1669         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1670         $(build)=$(build-dir)
1671 # Make sure the latest headers are built for Documentation
1672 Documentation/ samples/: headers_install
1673 %/: prepare scripts FORCE
1674         $(cmd_crmodverdir)
1675         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1676         $(build)=$(build-dir)
1677 %.ko: prepare scripts FORCE
1678         $(cmd_crmodverdir)
1679         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1680         $(build)=$(build-dir) $(@:.ko=.o)
1681         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1682
1683 # FIXME Should go into a make.lib or something
1684 # ===========================================================================
1685
1686 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1687       cmd_rmdirs = rm -rf $(rm-dirs)
1688
1689 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1690       cmd_rmfiles = rm -f $(rm-files)
1691
1692 # Run depmod only if we have System.map and depmod is executable
1693 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1694       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1695                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1696
1697 # Create temporary dir for module support files
1698 # clean it up only when building all modules
1699 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1700                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1701
1702 # read all saved command lines
1703
1704 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1705
1706 ifneq ($(cmd_files),)
1707   $(cmd_files): ;       # Do not try to update included dependency files
1708   include $(cmd_files)
1709 endif
1710
1711 endif   # skip-makefile
1712
1713 PHONY += FORCE
1714 FORCE:
1715
1716 # Declare the contents of the .PHONY variable as phony.  We keep that
1717 # information in a variable so we can use it in if_changed and friends.
1718 .PHONY: $(PHONY)