Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 16
   4 SUBLEVEL = 0
   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.a 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 clean-targets := %clean mrproper cleandocs
 224 no-dot-config-targets := $(clean-targets) \
 225                          cscope gtags TAGS tags help% %docs check% coccicheck \
 226                          $(version_h) headers_% archheaders archscripts \
 227                          kernelversion %src-pkg
 228
 229 config-targets := 0
 230 mixed-targets  := 0
 231 dot-config     := 1
 232
 233 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 234         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 235                 dot-config := 0
 236         endif
 237 endif
 238
 239 ifeq ($(KBUILD_EXTMOD),)
 240         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 241                 config-targets := 1
 242                 ifneq ($(words $(MAKECMDGOALS)),1)
 243                         mixed-targets := 1
 244                 endif
 245         endif
 246 endif
 247
 248 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 249 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 250         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 251                 mixed-targets := 1
 252         endif
 253 endif
 254
 255 # install and modules_install need also be processed one by one
 256 ifneq ($(filter install,$(MAKECMDGOALS)),)
 257         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 258                 mixed-targets := 1
 259         endif
 260 endif
 261
 262 ifeq ($(mixed-targets),1)
 263 # ===========================================================================
 264 # We're called with mixed targets (*config and build targets).
 265 # Handle them one by one.
 266
 267 PHONY += $(MAKECMDGOALS) __build_one_by_one
 268
 269 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 270         @:
 271
 272 __build_one_by_one:
 273         $(Q)set -e; \
 274         for i in $(MAKECMDGOALS); do \
 275                 $(MAKE) -f $(srctree)/Makefile $$i; \
 276         done
 277
 278 else
 279
 280 # We need some generic definitions (do not try to remake the file).
 281 scripts/Kbuild.include: ;
 282 include scripts/Kbuild.include
 283
 284 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 285 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 286 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 287 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 288
 289 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 290 # first, and if a usermode build is happening, the "ARCH=um" on the command
 291 # line overrides the setting of ARCH below.  If a native build is happening,
 292 # then ARCH is assigned, getting whatever value it gets normally, and
 293 # SUBARCH is subsequently ignored.
 294
 295 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 296                                   -e s/sun4u/sparc64/ \
 297                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 298                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 299                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 300                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
 301                                   -e s/riscv.*/riscv/)
 302
 303 # Cross compiling and selecting different set of gcc/bin-utils
 304 # ---------------------------------------------------------------------------
 305 #
 306 # When performing cross compilation for other architectures ARCH shall be set
 307 # to the target architecture. (See arch/* for the possibilities).
 308 # ARCH can be set during invocation of make:
 309 # make ARCH=ia64
 310 # Another way is to have ARCH set in the environment.
 311 # The default ARCH is the host where make is executed.
 312
 313 # CROSS_COMPILE specify the prefix used for all executables used
 314 # during compilation. Only gcc and related bin-utils executables
 315 # are prefixed with $(CROSS_COMPILE).
 316 # CROSS_COMPILE can be set on the command line
 317 # make CROSS_COMPILE=ia64-linux-
 318 # Alternatively CROSS_COMPILE can be set in the environment.
 319 # A third alternative is to store a setting in .config so that plain
 320 # "make" in the configured kernel build directory always uses that.
 321 # Default value for CROSS_COMPILE is not to prefix executables
 322 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 323 ARCH            ?= $(SUBARCH)
 324 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 325
 326 # Architecture as present in compile.h
 327 UTS_MACHINE     := $(ARCH)
 328 SRCARCH         := $(ARCH)
 329
 330 # Additional ARCH settings for x86
 331 ifeq ($(ARCH),i386)
 332         SRCARCH := x86
 333 endif
 334 ifeq ($(ARCH),x86_64)
 335         SRCARCH := x86
 336 endif
 337
 338 # Additional ARCH settings for sparc
 339 ifeq ($(ARCH),sparc32)
 340        SRCARCH := sparc
 341 endif
 342 ifeq ($(ARCH),sparc64)
 343        SRCARCH := sparc
 344 endif
 345
 346 # Additional ARCH settings for sh
 347 ifeq ($(ARCH),sh64)
 348        SRCARCH := sh
 349 endif
 350
 351 KCONFIG_CONFIG  ?= .config
 352 export KCONFIG_CONFIG
 353
 354 # SHELL used by kbuild
 355 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 356           else if [ -x /bin/bash ]; then echo /bin/bash; \
 357           else echo sh; fi ; fi)
 358
 359 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
 360 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
 361 HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
 362
 363 HOSTCC       = gcc
 364 HOSTCXX      = g++
 365 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 366                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 367 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 368 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 369 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 370
 371 # Make variables (CC, etc...)
 372 AS              = $(CROSS_COMPILE)as
 373 LD              = $(CROSS_COMPILE)ld
 374 CC              = $(CROSS_COMPILE)gcc
 375 CPP             = $(CC) -E
 376 AR              = $(CROSS_COMPILE)ar
 377 NM              = $(CROSS_COMPILE)nm
 378 STRIP           = $(CROSS_COMPILE)strip
 379 OBJCOPY         = $(CROSS_COMPILE)objcopy
 380 OBJDUMP         = $(CROSS_COMPILE)objdump
 381 LEX             = flex
 382 YACC            = bison
 383 AWK             = awk
 384 GENKSYMS        = scripts/genksyms/genksyms
 385 INSTALLKERNEL  := installkernel
 386 DEPMOD          = /sbin/depmod
 387 PERL            = perl
 388 PYTHON          = python
 389 PYTHON2         = python2
 390 PYTHON3         = python3
 391 CHECK           = sparse
 392
 393 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 394                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 395 NOSTDINC_FLAGS  =
 396 CFLAGS_MODULE   =
 397 AFLAGS_MODULE   =
 398 LDFLAGS_MODULE  =
 399 CFLAGS_KERNEL   =
 400 AFLAGS_KERNEL   =
 401 LDFLAGS_vmlinux =
 402
 403 # Use USERINCLUDE when you must reference the UAPI directories only.
 404 USERINCLUDE    := \
 405                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 406                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 407                 -I$(srctree)/include/uapi \
 408                 -I$(objtree)/include/generated/uapi \
 409                 -include $(srctree)/include/linux/kconfig.h
 410
 411 # Use LINUXINCLUDE when you must reference the include/ directory.
 412 # Needed to be compatible with the O= option
 413 LINUXINCLUDE    := \
 414                 -I$(srctree)/arch/$(SRCARCH)/include \
 415                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 416                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 417                 -I$(objtree)/include \
 418                 $(USERINCLUDE)
 419
 420 KBUILD_AFLAGS   := -D__ASSEMBLY__
 421 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 422                    -fno-strict-aliasing -fno-common -fshort-wchar \
 423                    -Werror-implicit-function-declaration \
 424                    -Wno-format-security \
 425                    -std=gnu89
 426 KBUILD_CPPFLAGS := -D__KERNEL__
 427 KBUILD_AFLAGS_KERNEL :=
 428 KBUILD_CFLAGS_KERNEL :=
 429 KBUILD_AFLAGS_MODULE  := -DMODULE
 430 KBUILD_CFLAGS_MODULE  := -DMODULE
 431 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 432 LDFLAGS :=
 433 GCC_PLUGINS_CFLAGS :=
 434
 435 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 436 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 437 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 438 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 439
 440 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 441 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 442 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 443 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 444 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 445 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 446 export KBUILD_ARFLAGS
 447
 448 # When compiling out-of-tree modules, put MODVERDIR in the module
 449 # tree rather than in the kernel tree. The kernel tree might
 450 # even be read-only.
 451 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 452
 453 # Files to ignore in find ... statements
 454
 455 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 456                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 457                           -prune -o
 458 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 459                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 460
 461 # ===========================================================================
 462 # Rules shared between *config targets and build targets
 463
 464 # Basic helpers built in scripts/basic/
 465 PHONY += scripts_basic
 466 scripts_basic:
 467         $(Q)$(MAKE) $(build)=scripts/basic
 468         $(Q)rm -f .tmp_quiet_recordmcount
 469
 470 # To avoid any implicit rule to kick in, define an empty command.
 471 scripts/basic/%: scripts_basic ;
 472
 473 PHONY += outputmakefile
 474 # outputmakefile generates a Makefile in the output directory, if using a
 475 # separate output directory. This allows convenient use of make in the
 476 # output directory.
 477 outputmakefile:
 478 ifneq ($(KBUILD_SRC),)
 479         $(Q)ln -fsn $(srctree) source
 480         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 481             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 482 endif
 483
 484 ifeq ($(cc-name),clang)
 485 ifneq ($(CROSS_COMPILE),)
 486 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 487 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 488 endif
 489 ifneq ($(GCC_TOOLCHAIN),)
 490 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 491 endif
 492 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 493 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 494 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 495 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 496 endif
 497
 498 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 499 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 500 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 501 export RETPOLINE_CFLAGS
 502
 503 # check for 'asm goto'
 504 ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 505   CC_HAVE_ASM_GOTO := 1
 506   KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 507   KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 508 endif
 509
 510 ifeq ($(config-targets),1)
 511 # ===========================================================================
 512 # *config targets only - make sure prerequisites are updated, and descend
 513 # in scripts/kconfig to make the *config target
 514
 515 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 516 # KBUILD_DEFCONFIG may point out an alternative default configuration
 517 # used for 'make defconfig'
 518 include arch/$(SRCARCH)/Makefile
 519 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 520
 521 config: scripts_basic outputmakefile FORCE
 522         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 523
 524 %config: scripts_basic outputmakefile FORCE
 525         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 526
 527 else
 528 # ===========================================================================
 529 # Build targets only - this includes vmlinux, arch specific targets, clean
 530 # targets and others. In general all targets except *config targets.
 531
 532 # If building an external module we do not care about the all: rule
 533 # but instead _all depend on modules
 534 PHONY += all
 535 ifeq ($(KBUILD_EXTMOD),)
 536 _all: all
 537 else
 538 _all: modules
 539 endif
 540
 541 # Decide whether to build built-in, modular, or both.
 542 # Normally, just do built-in.
 543
 544 KBUILD_MODULES :=
 545 KBUILD_BUILTIN := 1
 546
 547 # If we have only "make modules", don't compile built-in objects.
 548 # When we're building modules with modversions, we need to consider
 549 # the built-in objects during the descend as well, in order to
 550 # make sure the checksums are up to date before we record them.
 551
 552 ifeq ($(MAKECMDGOALS),modules)
 553   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 554 endif
 555
 556 # If we have "make <whatever> modules", compile modules
 557 # in addition to whatever we do anyway.
 558 # Just "make" or "make all" shall build modules as well
 559
 560 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 561   KBUILD_MODULES := 1
 562 endif
 563
 564 ifeq ($(MAKECMDGOALS),)
 565   KBUILD_MODULES := 1
 566 endif
 567
 568 export KBUILD_MODULES KBUILD_BUILTIN
 569
 570 ifeq ($(KBUILD_EXTMOD),)
 571 # Objects we will link into vmlinux / subdirs we need to visit
 572 init-y          := init/
 573 drivers-y       := drivers/ sound/ firmware/
 574 net-y           := net/
 575 libs-y          := lib/
 576 core-y          := usr/
 577 virt-y          := virt/
 578 endif # KBUILD_EXTMOD
 579
 580 ifeq ($(dot-config),1)
 581 # Read in config
 582 -include include/config/auto.conf
 583
 584 ifeq ($(KBUILD_EXTMOD),)
 585 # Read in dependencies to all Kconfig* files, make sure to run
 586 # oldconfig if changes are detected.
 587 -include include/config/auto.conf.cmd
 588
 589 # To avoid any implicit rule to kick in, define an empty command
 590 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 591
 592 # The actual configuration files used during the build are stored in
 593 # include/generated/ and include/config/. Update them if .config is newer than
 594 # include/config/auto.conf (which mirrors .config).
 595 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 596         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 597 else
 598 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 599 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 600 PHONY += include/config/auto.conf
 601
 602 include/config/auto.conf:
 603         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 604         echo >&2;                                                       \
 605         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 606         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 607         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 608         echo >&2 ;                                                      \
 609         /bin/false)
 610
 611 endif # KBUILD_EXTMOD
 612
 613 else
 614 # Dummy target needed, because used as prerequisite
 615 include/config/auto.conf: ;
 616 endif # $(dot-config)
 617
 618 # The all: target is the default when no target is given on the
 619 # command line.
 620 # This allow a user to issue only 'make' to build a kernel including modules
 621 # Defaults to vmlinux, but the arch makefile usually adds further targets
 622 all: vmlinux
 623
 624 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 625 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 626 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 627 export CFLAGS_GCOV CFLAGS_KCOV
 628
 629 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 630 # values of the respective KBUILD_* variables
 631 ARCH_CPPFLAGS :=
 632 ARCH_AFLAGS :=
 633 ARCH_CFLAGS :=
 634 include arch/$(SRCARCH)/Makefile
 635
 636 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 637 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 638 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 639 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 640 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 641
 642 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 643 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 644 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 645 else
 646 ifdef CONFIG_PROFILE_ALL_BRANCHES
 647 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 648 else
 649 KBUILD_CFLAGS   += -O2
 650 endif
 651 endif
 652
 653 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 654                         $(call cc-disable-warning,maybe-uninitialized,))
 655
 656 # Tell gcc to never replace conditional load with a non-conditional one
 657 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 658
 659 include scripts/Makefile.kcov
 660 include scripts/Makefile.gcc-plugins
 661
 662 ifdef CONFIG_READABLE_ASM
 663 # Disable optimizations that make assembler listings hard to read.
 664 # reorder blocks reorders the control in the function
 665 # ipa clone creates specialized cloned functions
 666 # partial inlining inlines only parts of functions
 667 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 668                  $(call cc-option,-fno-ipa-cp-clone,) \
 669                  $(call cc-option,-fno-partial-inlining)
 670 endif
 671
 672 ifneq ($(CONFIG_FRAME_WARN),0)
 673 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 674 endif
 675
 676 # This selects the stack protector compiler flag. Testing it is delayed
 677 # until after .config has been reprocessed, in the prepare-compiler-check
 678 # target.
 679 ifdef CONFIG_CC_STACKPROTECTOR_AUTO
 680   stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector))
 681   stackp-name := AUTO
 682 else
 683 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 684   stackp-flag := -fstack-protector
 685   stackp-name := REGULAR
 686 else
 687 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 688   stackp-flag := -fstack-protector-strong
 689   stackp-name := STRONG
 690 else
 691   # If either there is no stack protector for this architecture or
 692   # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name)
 693   # is empty, skipping all remaining stack protector tests.
 694   #
 695   # Force off for distro compilers that enable stack protector by default.
 696   KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 697 endif
 698 endif
 699 endif
 700 # Find arch-specific stack protector compiler sanity-checking script.
 701 ifdef stackp-name
 702 ifneq ($(stackp-flag),)
 703   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 704   stackp-check := $(wildcard $(stackp-path))
 705   # If the wildcard test matches a test script, run it to check functionality.
 706   ifdef stackp-check
 707     ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
 708       stackp-broken := y
 709     endif
 710   endif
 711   ifndef stackp-broken
 712     # If the stack protector is functional, enable code that depends on it.
 713     KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR
 714     # Either we've already detected the flag (for AUTO) or we'll fail the
 715     # build in the prepare-compiler-check rule (for specific flag).
 716     KBUILD_CFLAGS += $(stackp-flag)
 717   else
 718     # We have to make sure stack protector is unconditionally disabled if
 719     # the compiler is broken (in case we're going to continue the build in
 720     # AUTO mode).
 721     KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 722   endif
 723 endif
 724 endif
 725
 726 ifeq ($(cc-name),clang)
 727 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 728 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 729 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 730 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 731 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 732 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 733 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 734 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 735 # See modpost pattern 2
 736 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 737 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 738 else
 739
 740 # These warnings generated too much noise in a regular build.
 741 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 742 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 743 endif
 744
 745 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 746 ifdef CONFIG_FRAME_POINTER
 747 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 748 else
 749 # Some targets (ARM with Thumb2, for example), can't be built with frame
 750 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 751 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 752 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 753 # -fomit-frame-pointer with FUNCTION_TRACER.
 754 ifndef CONFIG_FUNCTION_TRACER
 755 KBUILD_CFLAGS   += -fomit-frame-pointer
 756 endif
 757 endif
 758
 759 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 760
 761 ifdef CONFIG_DEBUG_INFO
 762 ifdef CONFIG_DEBUG_INFO_SPLIT
 763 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 764 else
 765 KBUILD_CFLAGS   += -g
 766 endif
 767 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 768 endif
 769 ifdef CONFIG_DEBUG_INFO_DWARF4
 770 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 771 endif
 772
 773 ifdef CONFIG_DEBUG_INFO_REDUCED
 774 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 775                    $(call cc-option,-fno-var-tracking)
 776 endif
 777
 778 ifdef CONFIG_FUNCTION_TRACER
 779 ifndef CC_FLAGS_FTRACE
 780 CC_FLAGS_FTRACE := -pg
 781 endif
 782 export CC_FLAGS_FTRACE
 783 ifdef CONFIG_HAVE_FENTRY
 784 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 785 endif
 786 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 787 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 788 ifdef CONFIG_DYNAMIC_FTRACE
 789         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 790                 BUILD_C_RECORDMCOUNT := y
 791                 export BUILD_C_RECORDMCOUNT
 792         endif
 793 endif
 794 endif
 795
 796 # We trigger additional mismatches with less inlining
 797 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 798 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 799 endif
 800
 801 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 802 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 803 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 804 endif
 805
 806 # arch Makefile may override CC so keep this after arch Makefile is included
 807 NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
 808 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 809
 810 # warn about C99 declaration after statement
 811 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 812
 813 # disable pointer signed / unsigned warnings in gcc 4.0
 814 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 815
 816 # disable invalid "can't wrap" optimizations for signed / pointers
 817 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 818
 819 # clang sets -fmerge-all-constants by default as optimization, but this
 820 # is non-conforming behavior for C and in fact breaks the kernel, so we
 821 # need to disable it here generally.
 822 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 823
 824 # for gcc -fno-merge-all-constants disables everything, but it is fine
 825 # to have actual conforming behavior enabled.
 826 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 827
 828 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 829 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 830
 831 # conserve stack if available
 832 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 833
 834 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 835 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 836
 837 # require functions to have arguments in prototypes, not empty 'int foo()'
 838 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 839
 840 # Prohibit date/time macros, which would make the build non-deterministic
 841 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 842
 843 # enforce correct pointer usage
 844 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 845
 846 # Require designated initializers for all marked structures
 847 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 848
 849 # use the deterministic mode of AR if available
 850 KBUILD_ARFLAGS := $(call ar-option,D)
 851
 852 include scripts/Makefile.kasan
 853 include scripts/Makefile.extrawarn
 854 include scripts/Makefile.ubsan
 855
 856 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 857 # last assignments
 858 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 859 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 860 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 861
 862 # Use --build-id when available.
 863 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 864 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 865 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 866
 867 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 868 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 869 endif
 870
 871 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 872 LDFLAGS_vmlinux += $(call ld-option, -X,)
 873 endif
 874
 875 # Default kernel image to build when no specific target is given.
 876 # KBUILD_IMAGE may be overruled on the command line or
 877 # set in the environment
 878 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 879 # this default value
 880 export KBUILD_IMAGE ?= vmlinux
 881
 882 #
 883 # INSTALL_PATH specifies where to place the updated kernel and system map
 884 # images. Default is /boot, but you can set it to other values
 885 export  INSTALL_PATH ?= /boot
 886
 887 #
 888 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 889 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 890 # an argument if needed. Otherwise it defaults to the kernel install path
 891 #
 892 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 893
 894 #
 895 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 896 # relocations required by build roots.  This is not defined in the
 897 # makefile but the argument can be passed to make if needed.
 898 #
 899
 900 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 901 export MODLIB
 902
 903 #
 904 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 905 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 906 # the default option --strip-debug will be used.  Otherwise,
 907 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 908
 909 ifdef INSTALL_MOD_STRIP
 910 ifeq ($(INSTALL_MOD_STRIP),1)
 911 mod_strip_cmd = $(STRIP) --strip-debug
 912 else
 913 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 914 endif # INSTALL_MOD_STRIP=1
 915 else
 916 mod_strip_cmd = true
 917 endif # INSTALL_MOD_STRIP
 918 export mod_strip_cmd
 919
 920 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 921 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 922 # or CONFIG_MODULE_COMPRESS_XZ.
 923
 924 mod_compress_cmd = true
 925 ifdef CONFIG_MODULE_COMPRESS
 926   ifdef CONFIG_MODULE_COMPRESS_GZIP
 927     mod_compress_cmd = gzip -n -f
 928   endif # CONFIG_MODULE_COMPRESS_GZIP
 929   ifdef CONFIG_MODULE_COMPRESS_XZ
 930     mod_compress_cmd = xz -f
 931   endif # CONFIG_MODULE_COMPRESS_XZ
 932 endif # CONFIG_MODULE_COMPRESS
 933 export mod_compress_cmd
 934
 935 # Select initial ramdisk compression format, default is gzip(1).
 936 # This shall be used by the dracut(8) tool while creating an initramfs image.
 937 #
 938 INITRD_COMPRESS-y                  := gzip
 939 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 940 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 941 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 942 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 943 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 944 # do not export INITRD_COMPRESS, since we didn't actually
 945 # choose a sane default compression above.
 946 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 947
 948 ifdef CONFIG_MODULE_SIG_ALL
 949 $(eval $(call config_filename,MODULE_SIG_KEY))
 950
 951 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 952 else
 953 mod_sign_cmd = true
 954 endif
 955 export mod_sign_cmd
 956
 957 ifdef CONFIG_STACK_VALIDATION
 958   has_libelf := $(call try-run,\
 959                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 960   ifeq ($(has_libelf),1)
 961     objtool_target := tools/objtool FORCE
 962   else
 963     ifdef CONFIG_UNWINDER_ORC
 964       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 965     else
 966       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 967     endif
 968     SKIP_STACK_VALIDATION := 1
 969     export SKIP_STACK_VALIDATION
 970   endif
 971 endif
 972
 973
 974 ifeq ($(KBUILD_EXTMOD),)
 975 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 976
 977 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 978                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 979                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 980
 981 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 982                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 983
 984 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 985 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 986 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 987 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 988 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 989 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 990 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 991
 992 # Externally visible symbols (used by link-vmlinux.sh)
 993 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 994 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 995 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 996 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 997 export LDFLAGS_vmlinux
 998 # used by scripts/package/Makefile
 999 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1000
1001 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1002
1003 # Recurse until adjust_autoksyms.sh is satisfied
1004 PHONY += autoksyms_recursive
1005 autoksyms_recursive: $(vmlinux-deps)
1006 ifdef CONFIG_TRIM_UNUSED_KSYMS
1007         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1008           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1009 endif
1010
1011 # For the kernel to actually contain only the needed exported symbols,
1012 # we have to build modules as well to determine what those symbols are.
1013 # (this can be evaluated only once include/config/auto.conf has been included)
1014 ifdef CONFIG_TRIM_UNUSED_KSYMS
1015   KBUILD_MODULES := 1
1016 endif
1017
1018 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1019
1020 $(autoksyms_h):
1021         $(Q)mkdir -p $(dir $@)
1022         $(Q)touch $@
1023
1024 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1025
1026 # Final link of vmlinux with optional arch pass after final link
1027 cmd_link-vmlinux =                                                 \
1028         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1029         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1030
1031 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1032 ifdef CONFIG_HEADERS_CHECK
1033         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1034 endif
1035 ifdef CONFIG_GDB_SCRIPTS
1036         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1037 endif
1038         +$(call if_changed,link-vmlinux)
1039
1040 # Build samples along the rest of the kernel
1041 ifdef CONFIG_SAMPLES
1042 vmlinux-dirs += samples
1043 endif
1044
1045 # The actual objects are generated when descending,
1046 # make sure no implicit rule kicks in
1047 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1048
1049 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1050 # Preset locale variables to speed up the build process. Limit locale
1051 # tweaks to this spot to avoid wrong language settings when running
1052 # make menuconfig etc.
1053 # Error messages still appears in the original language
1054
1055 PHONY += $(vmlinux-dirs)
1056 $(vmlinux-dirs): prepare scripts
1057         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1058
1059 define filechk_kernel.release
1060         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1061 endef
1062
1063 # Store (new) KERNELRELEASE string in include/config/kernel.release
1064 include/config/kernel.release: include/config/auto.conf FORCE
1065         $(call filechk,kernel.release)
1066
1067 # Additional helpers built in scripts/
1068 # Carefully list dependencies so we do not try to build scripts twice
1069 # in parallel
1070 PHONY += scripts
1071 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
1072          asm-generic gcc-plugins $(autoksyms_h)
1073         $(Q)$(MAKE) $(build)=$(@)
1074
1075 # Things we need to do before we recursively start building the kernel
1076 # or the modules are listed in "prepare".
1077 # A multi level approach is used. prepareN is processed before prepareN-1.
1078 # archprepare is used in arch Makefiles and when processed asm symlink,
1079 # version.h and scripts_basic is processed / created.
1080
1081 # Listed in dependency order
1082 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1083
1084 # prepare3 is used to check if we are building in a separate output directory,
1085 # and if so do:
1086 # 1) Check that make has not been executed in the kernel src $(srctree)
1087 prepare3: include/config/kernel.release
1088 ifneq ($(KBUILD_SRC),)
1089         @$(kecho) '  Using $(srctree) as source for kernel'
1090         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1091                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1092                 echo >&2 "  in the '$(srctree)' directory.";\
1093                 /bin/false; \
1094         fi;
1095 endif
1096
1097 # prepare2 creates a makefile if using a separate output directory.
1098 # From this point forward, .config has been reprocessed, so any rules
1099 # that need to depend on updated CONFIG_* values can be checked here.
1100 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1101
1102 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1103                    include/config/auto.conf
1104         $(cmd_crmodverdir)
1105
1106 archprepare: archheaders archscripts prepare1 scripts_basic
1107
1108 prepare0: archprepare gcc-plugins
1109         $(Q)$(MAKE) $(build)=.
1110
1111 # All the preparing..
1112 prepare: prepare0 prepare-objtool
1113
1114 # Support for using generic headers in asm-generic
1115 PHONY += asm-generic uapi-asm-generic
1116 asm-generic: uapi-asm-generic
1117         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1118                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1119 uapi-asm-generic:
1120         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1121                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1122
1123 PHONY += prepare-objtool
1124 prepare-objtool: $(objtool_target)
1125
1126 # Check for CONFIG flags that require compiler support. Abort the build
1127 # after .config has been processed, but before the kernel build starts.
1128 #
1129 # For security-sensitive CONFIG options, we don't want to fallback and/or
1130 # silently change which compiler flags will be used, since that leads to
1131 # producing kernels with different security feature characteristics
1132 # depending on the compiler used. (For example, "But I selected
1133 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1134 PHONY += prepare-compiler-check
1135 prepare-compiler-check: FORCE
1136 # Make sure compiler supports requested stack protector flag.
1137 ifdef stackp-name
1138   # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
1139   ifeq ($(stackp-flag),)
1140         @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1141                   Compiler does not support any known stack-protector >&2
1142   else
1143   # Fail if specifically requested stack protector is missing.
1144   ifeq ($(call cc-option, $(stackp-flag)),)
1145         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1146                   $(stackp-flag) not supported by compiler >&2 && exit 1
1147   endif
1148   endif
1149 endif
1150 # Make sure compiler does not have buggy stack-protector support. If a
1151 # specific stack-protector was requested, fail the build, otherwise warn.
1152 ifdef stackp-broken
1153   ifeq ($(stackp-name),AUTO)
1154         @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1155                   $(stackp-flag) available but compiler is broken: disabling >&2
1156   else
1157         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1158                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1159   endif
1160 endif
1161         @:
1162
1163 # Generate some files
1164 # ---------------------------------------------------------------------------
1165
1166 # KERNELRELEASE can change from a few different places, meaning version.h
1167 # needs to be updated, so this check is forced on all builds
1168
1169 uts_len := 64
1170 define filechk_utsrelease.h
1171         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1172           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1173           exit 1;                                                         \
1174         fi;                                                               \
1175         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1176 endef
1177
1178 define filechk_version.h
1179         (echo \#define LINUX_VERSION_CODE $(shell                         \
1180         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1181         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1182 endef
1183
1184 $(version_h): $(srctree)/Makefile FORCE
1185         $(call filechk,version.h)
1186         $(Q)rm -f $(old_version_h)
1187
1188 include/generated/utsrelease.h: include/config/kernel.release FORCE
1189         $(call filechk,utsrelease.h)
1190
1191 PHONY += headerdep
1192 headerdep:
1193         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1194         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1195
1196 # ---------------------------------------------------------------------------
1197 # Kernel headers
1198
1199 #Default location for installed headers
1200 export INSTALL_HDR_PATH = $(objtree)/usr
1201
1202 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1203 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1204
1205 PHONY += archheaders
1206 archheaders:
1207
1208 PHONY += archscripts
1209 archscripts:
1210
1211 PHONY += __headers
1212 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1213         $(Q)$(MAKE) $(build)=scripts build_unifdef
1214
1215 PHONY += headers_install_all
1216 headers_install_all:
1217         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1218
1219 PHONY += headers_install
1220 headers_install: __headers
1221         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1222           $(error Headers not exportable for the $(SRCARCH) architecture))
1223         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1224         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1225
1226 PHONY += headers_check_all
1227 headers_check_all: headers_install_all
1228         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1229
1230 PHONY += headers_check
1231 headers_check: headers_install
1232         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1233         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1234
1235 # ---------------------------------------------------------------------------
1236 # Kernel selftest
1237
1238 PHONY += kselftest
1239 kselftest:
1240         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1241
1242 PHONY += kselftest-clean
1243 kselftest-clean:
1244         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1245
1246 PHONY += kselftest-merge
1247 kselftest-merge:
1248         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1249         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1250                 -m $(objtree)/.config \
1251                 $(srctree)/tools/testing/selftests/*/config
1252         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1253
1254 # ---------------------------------------------------------------------------
1255 # Modules
1256
1257 ifdef CONFIG_MODULES
1258
1259 # By default, build modules as well
1260
1261 all: modules
1262
1263 # Build modules
1264 #
1265 # A module can be listed more than once in obj-m resulting in
1266 # duplicate lines in modules.order files.  Those are removed
1267 # using awk while concatenating to the final file.
1268
1269 PHONY += modules
1270 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1271         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1272         @$(kecho) '  Building modules, stage 2.';
1273         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1274
1275 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1276         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1277
1278 %/modules.builtin: include/config/auto.conf
1279         $(Q)$(MAKE) $(modbuiltin)=$*
1280
1281
1282 # Target to prepare building external modules
1283 PHONY += modules_prepare
1284 modules_prepare: prepare scripts
1285
1286 # Target to install modules
1287 PHONY += modules_install
1288 modules_install: _modinst_ _modinst_post
1289
1290 PHONY += _modinst_
1291 _modinst_:
1292         @rm -rf $(MODLIB)/kernel
1293         @rm -f $(MODLIB)/source
1294         @mkdir -p $(MODLIB)/kernel
1295         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1296         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1297                 rm -f $(MODLIB)/build ; \
1298                 ln -s $(CURDIR) $(MODLIB)/build ; \
1299         fi
1300         @cp -f $(objtree)/modules.order $(MODLIB)/
1301         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1302         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1303
1304 # This depmod is only for convenience to give the initial
1305 # boot a modules.dep even before / is mounted read-write.  However the
1306 # boot script depmod is the master version.
1307 PHONY += _modinst_post
1308 _modinst_post: _modinst_
1309         $(call cmd,depmod)
1310
1311 ifeq ($(CONFIG_MODULE_SIG), y)
1312 PHONY += modules_sign
1313 modules_sign:
1314         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1315 endif
1316
1317 else # CONFIG_MODULES
1318
1319 # Modules not configured
1320 # ---------------------------------------------------------------------------
1321
1322 PHONY += modules modules_install
1323 modules modules_install:
1324         @echo >&2
1325         @echo >&2 "The present kernel configuration has modules disabled."
1326         @echo >&2 "Type 'make config' and enable loadable module support."
1327         @echo >&2 "Then build a kernel with module support enabled."
1328         @echo >&2
1329         @exit 1
1330
1331 endif # CONFIG_MODULES
1332
1333 ###
1334 # Cleaning is done on three levels.
1335 # make clean     Delete most generated files
1336 #                Leave enough to build external modules
1337 # make mrproper  Delete the current configuration, and all generated files
1338 # make distclean Remove editor backup files, patch leftover files and the like
1339
1340 # Directories & files removed with 'make clean'
1341 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1342
1343 # Directories & files removed with 'make mrproper'
1344 MRPROPER_DIRS  += include/config usr/include include/generated          \
1345                   arch/*/include/generated .tmp_objdiff
1346 MRPROPER_FILES += .config .config.old .version \
1347                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1348                   signing_key.pem signing_key.priv signing_key.x509     \
1349                   x509.genkey extra_certificates signing_key.x509.keyid \
1350                   signing_key.x509.signer vmlinux-gdb.py
1351
1352 # clean - Delete most, but leave enough to build external modules
1353 #
1354 clean: rm-dirs  := $(CLEAN_DIRS)
1355 clean: rm-files := $(CLEAN_FILES)
1356 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1357
1358 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1359 $(clean-dirs):
1360         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1361
1362 vmlinuxclean:
1363         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1364         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1365
1366 clean: archclean vmlinuxclean
1367
1368 # mrproper - Delete all generated files, including .config
1369 #
1370 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1371 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1372 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1373
1374 PHONY += $(mrproper-dirs) mrproper archmrproper
1375 $(mrproper-dirs):
1376         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1377
1378 mrproper: clean archmrproper $(mrproper-dirs)
1379         $(call cmd,rmdirs)
1380         $(call cmd,rmfiles)
1381
1382 # distclean
1383 #
1384 PHONY += distclean
1385
1386 distclean: mrproper
1387         @find $(srctree) $(RCS_FIND_IGNORE) \
1388                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1389                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1390                 -o -name 'core' \) \
1391                 -type f -print | xargs rm -f
1392
1393
1394 # Packaging of the kernel to various formats
1395 # ---------------------------------------------------------------------------
1396 # rpm target kept for backward compatibility
1397 package-dir     := scripts/package
1398
1399 %src-pkg: FORCE
1400         $(Q)$(MAKE) $(build)=$(package-dir) $@
1401 %pkg: include/config/kernel.release FORCE
1402         $(Q)$(MAKE) $(build)=$(package-dir) $@
1403 rpm: rpm-pkg
1404         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1405         @echo "           Please use \"rpm-pkg\" instead."
1406
1407
1408 # Brief documentation of the typical targets used
1409 # ---------------------------------------------------------------------------
1410
1411 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1412 boards := $(sort $(notdir $(boards)))
1413 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1414 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1415
1416 PHONY += help
1417 help:
1418         @echo  'Cleaning targets:'
1419         @echo  '  clean           - Remove most generated files but keep the config and'
1420         @echo  '                    enough build support to build external modules'
1421         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1422         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1423         @echo  ''
1424         @echo  'Configuration targets:'
1425         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1426         @echo  ''
1427         @echo  'Other generic targets:'
1428         @echo  '  all             - Build all targets marked with [*]'
1429         @echo  '* vmlinux         - Build the bare kernel'
1430         @echo  '* modules         - Build all modules'
1431         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1432         @echo  '  dir/            - Build all files in dir and below'
1433         @echo  '  dir/file.[ois]  - Build specified target only'
1434         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1435         @echo  '                    (requires compiler support for LLVM assembly generation)'
1436         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1437         @echo  '                    (requires a recent binutils and recent build (System.map))'
1438         @echo  '  dir/file.ko     - Build module including final link'
1439         @echo  '  modules_prepare - Set up for building external modules'
1440         @echo  '  tags/TAGS       - Generate tags file for editors'
1441         @echo  '  cscope          - Generate cscope index'
1442         @echo  '  gtags           - Generate GNU GLOBAL index'
1443         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1444         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1445         @echo  '  image_name      - Output the image name (use with make -s)'
1446         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1447          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1448          echo  ''
1449         @echo  'Static analysers:'
1450         @echo  '  checkstack      - Generate a list of stack hogs'
1451         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1452         @echo  '  versioncheck    - Sanity check on version.h usage'
1453         @echo  '  includecheck    - Check for duplicate included header files'
1454         @echo  '  export_report   - List the usages of all exported symbols'
1455         @echo  '  headers_check   - Sanity check on exported headers'
1456         @echo  '  headerdep       - Detect inclusion cycles in headers'
1457         @echo  '  coccicheck      - Check with Coccinelle'
1458         @echo  ''
1459         @echo  'Kernel selftest:'
1460         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1461         @echo  '                    Build, install, and boot kernel before'
1462         @echo  '                    running kselftest on it'
1463         @echo  '  kselftest-clean - Remove all generated kselftest files'
1464         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1465         @echo  '                    .config.'
1466         @echo  ''
1467         @echo 'Userspace tools targets:'
1468         @echo '  use "make tools/help"'
1469         @echo '  or  "cd tools; make help"'
1470         @echo  ''
1471         @echo  'Kernel packaging:'
1472         @$(MAKE) $(build)=$(package-dir) help
1473         @echo  ''
1474         @echo  'Documentation targets:'
1475         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1476         @echo  ''
1477         @echo  'Architecture specific targets ($(SRCARCH)):'
1478         @$(if $(archhelp),$(archhelp),\
1479                 echo '  No architecture specific help defined for $(SRCARCH)')
1480         @echo  ''
1481         @$(if $(boards), \
1482                 $(foreach b, $(boards), \
1483                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1484                 echo '')
1485         @$(if $(board-dirs), \
1486                 $(foreach b, $(board-dirs), \
1487                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1488                 printf "  %-16s - Show all of the above\\n" help-boards; \
1489                 echo '')
1490
1491         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1492         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1493         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1494         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1495         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1496         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1497         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1498         @echo  '                1: warnings which may be relevant and do not occur too often'
1499         @echo  '                2: warnings which occur quite often but may still be relevant'
1500         @echo  '                3: more obscure warnings, can most likely be ignored'
1501         @echo  '                Multiple levels can be combined with W=12 or W=123'
1502         @echo  ''
1503         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1504         @echo  'For further info see the ./README file'
1505
1506
1507 help-board-dirs := $(addprefix help-,$(board-dirs))
1508
1509 help-boards: $(help-board-dirs)
1510
1511 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1512
1513 $(help-board-dirs): help-%:
1514         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1515         @$(if $(boards-per-dir), \
1516                 $(foreach b, $(boards-per-dir), \
1517                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1518                 echo '')
1519
1520
1521 # Documentation targets
1522 # ---------------------------------------------------------------------------
1523 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1524                linkcheckdocs dochelp refcheckdocs
1525 PHONY += $(DOC_TARGETS)
1526 $(DOC_TARGETS): scripts_basic FORCE
1527         $(Q)$(MAKE) $(build)=Documentation $@
1528
1529 else # KBUILD_EXTMOD
1530
1531 ###
1532 # External module support.
1533 # When building external modules the kernel used as basis is considered
1534 # read-only, and no consistency checks are made and the make
1535 # system is not used on the basis kernel. If updates are required
1536 # in the basis kernel ordinary make commands (without M=...) must
1537 # be used.
1538 #
1539 # The following are the only valid targets when building external
1540 # modules.
1541 # make M=dir clean     Delete all automatically generated files
1542 # make M=dir modules   Make all modules in specified dir
1543 # make M=dir           Same as 'make M=dir modules'
1544 # make M=dir modules_install
1545 #                      Install the modules built in the module directory
1546 #                      Assumes install directory is already created
1547
1548 # We are always building modules
1549 KBUILD_MODULES := 1
1550 PHONY += crmodverdir
1551 crmodverdir:
1552         $(cmd_crmodverdir)
1553
1554 PHONY += $(objtree)/Module.symvers
1555 $(objtree)/Module.symvers:
1556         @test -e $(objtree)/Module.symvers || ( \
1557         echo; \
1558         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1559         echo "           is missing; modules will have no dependencies and modversions."; \
1560         echo )
1561
1562 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1563 PHONY += $(module-dirs) modules
1564 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1565         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1566
1567 modules: $(module-dirs)
1568         @$(kecho) '  Building modules, stage 2.';
1569         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1570
1571 PHONY += modules_install
1572 modules_install: _emodinst_ _emodinst_post
1573
1574 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1575 PHONY += _emodinst_
1576 _emodinst_:
1577         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1578         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1579
1580 PHONY += _emodinst_post
1581 _emodinst_post: _emodinst_
1582         $(call cmd,depmod)
1583
1584 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1585
1586 PHONY += $(clean-dirs) clean
1587 $(clean-dirs):
1588         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1589
1590 clean:  rm-dirs := $(MODVERDIR)
1591 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1592
1593 PHONY += help
1594 help:
1595         @echo  '  Building external modules.'
1596         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1597         @echo  ''
1598         @echo  '  modules         - default target, build the module(s)'
1599         @echo  '  modules_install - install the module'
1600         @echo  '  clean           - remove generated files in module directory only'
1601         @echo  ''
1602
1603 # Dummies...
1604 PHONY += prepare scripts
1605 prepare: ;
1606 scripts: ;
1607 endif # KBUILD_EXTMOD
1608
1609 clean: $(clean-dirs)
1610         $(call cmd,rmdirs)
1611         $(call cmd,rmfiles)
1612         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1613                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1614                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1615                 -o -name '*.dwo' -o -name '*.lst' \
1616                 -o -name '*.su'  \
1617                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1618                 -o -name '*.symtypes' -o -name 'modules.order' \
1619                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1620                 -o -name .cache.mk \
1621                 -o -name '*.c.[012]*.*' \
1622                 -o -name '*.ll' \
1623                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1624
1625 # Generate tags for editors
1626 # ---------------------------------------------------------------------------
1627 quiet_cmd_tags = GEN     $@
1628       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1629
1630 tags TAGS cscope gtags: FORCE
1631         $(call cmd,tags)
1632
1633 # Scripts to check various things for consistency
1634 # ---------------------------------------------------------------------------
1635
1636 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1637
1638 includecheck:
1639         find $(srctree)/* $(RCS_FIND_IGNORE) \
1640                 -name '*.[hcS]' -type f -print | sort \
1641                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1642
1643 versioncheck:
1644         find $(srctree)/* $(RCS_FIND_IGNORE) \
1645                 -name '*.[hcS]' -type f -print | sort \
1646                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1647
1648 coccicheck:
1649         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1650
1651 namespacecheck:
1652         $(PERL) $(srctree)/scripts/namespace.pl
1653
1654 export_report:
1655         $(PERL) $(srctree)/scripts/export_report.pl
1656
1657 endif #ifeq ($(config-targets),1)
1658 endif #ifeq ($(mixed-targets),1)
1659
1660 PHONY += checkstack kernelrelease kernelversion image_name
1661
1662 # UML needs a little special treatment here.  It wants to use the host
1663 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1664 # else wants $(ARCH), including people doing cross-builds, which means
1665 # that $(SUBARCH) doesn't work here.
1666 ifeq ($(ARCH), um)
1667 CHECKSTACK_ARCH := $(SUBARCH)
1668 else
1669 CHECKSTACK_ARCH := $(ARCH)
1670 endif
1671 checkstack:
1672         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1673         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1674
1675 kernelrelease:
1676         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1677
1678 kernelversion:
1679         @echo $(KERNELVERSION)
1680
1681 image_name:
1682         @echo $(KBUILD_IMAGE)
1683
1684 # Clear a bunch of variables before executing the submake
1685 tools/: FORCE
1686         $(Q)mkdir -p $(objtree)/tools
1687         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1688
1689 tools/%: FORCE
1690         $(Q)mkdir -p $(objtree)/tools
1691         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1692
1693 # Single targets
1694 # ---------------------------------------------------------------------------
1695 # Single targets are compatible with:
1696 # - build with mixed source and output
1697 # - build with separate output dir 'make O=...'
1698 # - external modules
1699 #
1700 #  target-dir => where to store outputfile
1701 #  build-dir  => directory in kernel source tree to use
1702
1703 ifeq ($(KBUILD_EXTMOD),)
1704         build-dir  = $(patsubst %/,%,$(dir $@))
1705         target-dir = $(dir $@)
1706 else
1707         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1708         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1709         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1710 endif
1711
1712 %.s: %.c prepare scripts FORCE
1713         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1714 %.i: %.c prepare scripts FORCE
1715         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1716 %.o: %.c prepare scripts FORCE
1717         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1718 %.lst: %.c prepare scripts FORCE
1719         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1720 %.s: %.S prepare scripts FORCE
1721         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1722 %.o: %.S prepare scripts FORCE
1723         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1724 %.symtypes: %.c prepare scripts FORCE
1725         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1726 %.ll: %.c prepare scripts FORCE
1727         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1728
1729 # Modules
1730 /: prepare scripts FORCE
1731         $(cmd_crmodverdir)
1732         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1733         $(build)=$(build-dir)
1734 # Make sure the latest headers are built for Documentation
1735 Documentation/ samples/: headers_install
1736 %/: prepare scripts FORCE
1737         $(cmd_crmodverdir)
1738         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1739         $(build)=$(build-dir)
1740 %.ko: prepare scripts FORCE
1741         $(cmd_crmodverdir)
1742         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1743         $(build)=$(build-dir) $(@:.ko=.o)
1744         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1745
1746 # FIXME Should go into a make.lib or something
1747 # ===========================================================================
1748
1749 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1750       cmd_rmdirs = rm -rf $(rm-dirs)
1751
1752 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1753       cmd_rmfiles = rm -f $(rm-files)
1754
1755 # Run depmod only if we have System.map and depmod is executable
1756 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1757       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1758                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1759
1760 # Create temporary dir for module support files
1761 # clean it up only when building all modules
1762 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1763                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1764
1765 # read all saved command lines
1766
1767 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1768
1769 ifneq ($(cmd_files),)
1770   $(cmd_files): ;       # Do not try to update included dependency files
1771   include $(cmd_files)
1772 endif
1773
1774 endif   # skip-makefile
1775
1776 PHONY += FORCE
1777 FORCE:
1778
1779 # Declare the contents of the .PHONY variable as phony.  We keep that
1780 # information in a variable so we can use it in if_changed and friends.
1781 .PHONY: $(PHONY)