Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 15
   4 SUBLEVEL = 18
   5 EXTRAVERSION =
   6 NAME = Fearless Coyote
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.o targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Call message checker as part of the C compilation
 180 #
 181 # Use 'make D=1' to enable checking
 182 # Use 'make D=2' to create the message catalog
 183
 184 ifdef D
 185   ifeq ("$(origin D)", "command line")
 186     KBUILD_KMSG_CHECK = $(D)
 187   endif
 188 endif
 189 ifndef KBUILD_KMSG_CHECK
 190   KBUILD_KMSG_CHECK = 0
 191 endif
 192
 193 # Use make M=dir to specify directory of external module to build
 194 # Old syntax make ... SUBDIRS=$PWD is still supported
 195 # Setting the environment variable KBUILD_EXTMOD take precedence
 196 ifdef SUBDIRS
 197   KBUILD_EXTMOD ?= $(SUBDIRS)
 198 endif
 199
 200 ifeq ("$(origin M)", "command line")
 201   KBUILD_EXTMOD := $(M)
 202 endif
 203
 204 ifeq ($(KBUILD_SRC),)
 205         # building in the source tree
 206         srctree := .
 207 else
 208         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 209                 # building in a subdirectory of the source tree
 210                 srctree := ..
 211         else
 212                 srctree := $(KBUILD_SRC)
 213         endif
 214 endif
 215
 216 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 217
 218 objtree         := .
 219 src             := $(srctree)
 220 obj             := $(objtree)
 221
 222 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 223
 224 export srctree objtree VPATH
 225
 226 # To make sure we do not include .config for any of the *config targets
 227 # catch them early, and hand them over to scripts/kconfig/Makefile
 228 # It is allowed to specify more targets when calling make, including
 229 # mixing *config targets and build targets.
 230 # For example 'make oldconfig all'.
 231 # Detect when mixed targets is specified, and make a second invocation
 232 # of make so .config is not included in this case either (for *config).
 233
 234 version_h := include/generated/uapi/linux/version.h
 235 old_version_h := include/linux/version.h
 236
 237 no-dot-config-targets := clean mrproper distclean \
 238                          cscope gtags TAGS tags help% %docs check% coccicheck \
 239                          $(version_h) headers_% archheaders archscripts \
 240                          kernelversion %src-pkg
 241 no-sync-config-targets := $(no-dot-config-targets) install %install
 242
 243 config-targets  := 0
 244 mixed-targets   := 0
 245 dot-config      := 1
 246 may-sync-config := 1
 247
 248 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 249         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 250                 dot-config := 0
 251         endif
 252 endif
 253
 254 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 255         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 256                 may-sync-config := 0
 257         endif
 258 endif
 259
 260 ifneq ($(KBUILD_EXTMOD),)
 261         may-sync-config := 0
 262 endif
 263
 264 ifeq ($(KBUILD_EXTMOD),)
 265         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 266                 config-targets := 1
 267                 ifneq ($(words $(MAKECMDGOALS)),1)
 268                         mixed-targets := 1
 269                 endif
 270         endif
 271 endif
 272 # install and modules_install need also be processed one by one
 273 ifneq ($(filter install,$(MAKECMDGOALS)),)
 274         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 275                 mixed-targets := 1
 276         endif
 277 endif
 278
 279 ifeq ($(mixed-targets),1)
 280 # ===========================================================================
 281 # We're called with mixed targets (*config and build targets).
 282 # Handle them one by one.
 283
 284 PHONY += $(MAKECMDGOALS) __build_one_by_one
 285
 286 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 287         @:
 288
 289 __build_one_by_one:
 290         $(Q)set -e; \
 291         for i in $(MAKECMDGOALS); do \
 292                 $(MAKE) -f $(srctree)/Makefile $$i; \
 293         done
 294
 295 else
 296
 297 # We need some generic definitions (do not try to remake the file).
 298 scripts/Kbuild.include: ;
 299 include scripts/Kbuild.include
 300
 301 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 302 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 303 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 304 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 305
 306 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 307 # first, and if a usermode build is happening, the "ARCH=um" on the command
 308 # line overrides the setting of ARCH below.  If a native build is happening,
 309 # then ARCH is assigned, getting whatever value it gets normally, and
 310 # SUBARCH is subsequently ignored.
 311
 312 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 313                                   -e s/sun4u/sparc64/ \
 314                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 315                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 316                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 317                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
 318                                   -e s/riscv.*/riscv/)
 319
 320 # Cross compiling and selecting different set of gcc/bin-utils
 321 # ---------------------------------------------------------------------------
 322 #
 323 # When performing cross compilation for other architectures ARCH shall be set
 324 # to the target architecture. (See arch/* for the possibilities).
 325 # ARCH can be set during invocation of make:
 326 # make ARCH=ia64
 327 # Another way is to have ARCH set in the environment.
 328 # The default ARCH is the host where make is executed.
 329
 330 # CROSS_COMPILE specify the prefix used for all executables used
 331 # during compilation. Only gcc and related bin-utils executables
 332 # are prefixed with $(CROSS_COMPILE).
 333 # CROSS_COMPILE can be set on the command line
 334 # make CROSS_COMPILE=ia64-linux-
 335 # Alternatively CROSS_COMPILE can be set in the environment.
 336 # A third alternative is to store a setting in .config so that plain
 337 # "make" in the configured kernel build directory always uses that.
 338 # Default value for CROSS_COMPILE is not to prefix executables
 339 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 340 ARCH            ?= $(SUBARCH)
 341 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 342
 343 # Architecture as present in compile.h
 344 UTS_MACHINE     := $(ARCH)
 345 SRCARCH         := $(ARCH)
 346
 347 # Additional ARCH settings for x86
 348 ifeq ($(ARCH),i386)
 349         SRCARCH := x86
 350 endif
 351 ifeq ($(ARCH),x86_64)
 352         SRCARCH := x86
 353 endif
 354
 355 # Additional ARCH settings for sparc
 356 ifeq ($(ARCH),sparc32)
 357        SRCARCH := sparc
 358 endif
 359 ifeq ($(ARCH),sparc64)
 360        SRCARCH := sparc
 361 endif
 362
 363 # Additional ARCH settings for sh
 364 ifeq ($(ARCH),sh64)
 365        SRCARCH := sh
 366 endif
 367
 368 # Additional ARCH settings for tile
 369 ifeq ($(ARCH),tilepro)
 370        SRCARCH := tile
 371 endif
 372 ifeq ($(ARCH),tilegx)
 373        SRCARCH := tile
 374 endif
 375
 376 KCONFIG_CONFIG  ?= .config
 377 export KCONFIG_CONFIG
 378
 379 # SHELL used by kbuild
 380 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 381           else if [ -x /bin/bash ]; then echo /bin/bash; \
 382           else echo sh; fi ; fi)
 383
 384 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 385 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 386 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 387
 388 HOSTCC       = gcc
 389 HOSTCXX      = g++
 390 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 391                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 392 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 393 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 394 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 395
 396 # Make variables (CC, etc...)
 397 AS              = $(CROSS_COMPILE)as
 398 LD              = $(CROSS_COMPILE)ld
 399 CC              = $(CROSS_COMPILE)gcc
 400 CPP             = $(CC) -E
 401 AR              = $(CROSS_COMPILE)ar
 402 NM              = $(CROSS_COMPILE)nm
 403 STRIP           = $(CROSS_COMPILE)strip
 404 OBJCOPY         = $(CROSS_COMPILE)objcopy
 405 OBJDUMP         = $(CROSS_COMPILE)objdump
 406 AWK             = awk
 407 GENKSYMS        = scripts/genksyms/genksyms
 408 INSTALLKERNEL  := installkernel
 409 DEPMOD          = /sbin/depmod
 410 PERL            = perl
 411 PYTHON          = python
 412 CHECK           = sparse
 413
 414 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 415                   -Wbitwise -Wno-return-void $(CF)
 416 KMSG_CHECK      = $(srctree)/scripts/kmsg-doc
 417 NOSTDINC_FLAGS  =
 418 CFLAGS_MODULE   =
 419 AFLAGS_MODULE   =
 420 LDFLAGS_MODULE  =
 421 CFLAGS_KERNEL   =
 422 AFLAGS_KERNEL   =
 423 LDFLAGS_vmlinux =
 424
 425 # Prefer linux-backports-modules
 426 ifneq ($(KBUILD_SRC),)
 427 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
 428 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
 429 endif
 430 endif
 431
 432 # Use USERINCLUDE when you must reference the UAPI directories only.
 433 USERINCLUDE    := \
 434                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 435                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 436                 -I$(srctree)/include/uapi \
 437                 -I$(objtree)/include/generated/uapi \
 438                 -include $(srctree)/include/linux/kconfig.h
 439
 440 # Use LINUXINCLUDE when you must reference the include/ directory.
 441 # Needed to be compatible with the O= option
 442 LINUXINCLUDE    := \
 443                 $(UBUNTUINCLUDE) \
 444                 -I$(srctree)/arch/$(SRCARCH)/include \
 445                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 446                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 447                 -I$(objtree)/include \
 448                 $(USERINCLUDE)
 449
 450 # UBUNTU: Include our third party driver stuff too
 451 LINUXINCLUDE   += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
 452
 453 KBUILD_AFLAGS   := -D__ASSEMBLY__
 454 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 455                    -fno-strict-aliasing -fno-common -fshort-wchar \
 456                    -Werror-implicit-function-declaration \
 457                    -Wno-format-security \
 458                    -std=gnu89
 459 KBUILD_CPPFLAGS := -D__KERNEL__
 460 KBUILD_AFLAGS_KERNEL :=
 461 KBUILD_CFLAGS_KERNEL :=
 462 KBUILD_AFLAGS_MODULE  := -DMODULE
 463 KBUILD_CFLAGS_MODULE  := -DMODULE
 464 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 465 GCC_PLUGINS_CFLAGS :=
 466
 467 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 468 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 469 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 470 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 471
 472 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 473 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 474 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 475 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 476 export KBUILD_KMSG_CHECK KMSG_CHECK
 477 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 478 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 479 export KBUILD_ARFLAGS
 480
 481 # When compiling out-of-tree modules, put MODVERDIR in the module
 482 # tree rather than in the kernel tree. The kernel tree might
 483 # even be read-only.
 484 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 485
 486 # Files to ignore in find ... statements
 487
 488 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 489                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 490                           -prune -o
 491 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 492                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 493
 494 # ===========================================================================
 495 # Rules shared between *config targets and build targets
 496
 497 # Basic helpers built in scripts/basic/
 498 PHONY += scripts_basic
 499 scripts_basic:
 500         $(Q)$(MAKE) $(build)=scripts/basic
 501         $(Q)rm -f .tmp_quiet_recordmcount
 502
 503 # To avoid any implicit rule to kick in, define an empty command.
 504 scripts/basic/%: scripts_basic ;
 505
 506 PHONY += outputmakefile
 507 # outputmakefile generates a Makefile in the output directory, if using a
 508 # separate output directory. This allows convenient use of make in the
 509 # output directory.
 510 outputmakefile:
 511 ifneq ($(KBUILD_SRC),)
 512         $(Q)ln -fsn $(srctree) source
 513         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 514             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 515 endif
 516
 517 ifeq ($(cc-name),clang)
 518 ifneq ($(CROSS_COMPILE),)
 519 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 520 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 521 endif
 522 ifneq ($(GCC_TOOLCHAIN),)
 523 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 524 endif
 525 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 526 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 527 endif
 528
 529 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 530 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 531 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 532 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 533 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 534 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 535 export RETPOLINE_CFLAGS
 536 export RETPOLINE_VDSO_CFLAGS
 537
 538 ifeq ($(config-targets),1)
 539 # ===========================================================================
 540 # *config targets only - make sure prerequisites are updated, and descend
 541 # in scripts/kconfig to make the *config target
 542
 543 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 544 # KBUILD_DEFCONFIG may point out an alternative default configuration
 545 # used for 'make defconfig'
 546 include arch/$(SRCARCH)/Makefile
 547 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 548
 549 config: scripts_basic outputmakefile FORCE
 550         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 551
 552 %config: scripts_basic outputmakefile FORCE
 553         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 554
 555 else
 556 # ===========================================================================
 557 # Build targets only - this includes vmlinux, arch specific targets, clean
 558 # targets and others. In general all targets except *config targets.
 559
 560 # If building an external module we do not care about the all: rule
 561 # but instead _all depend on modules
 562 PHONY += all
 563 ifeq ($(KBUILD_EXTMOD),)
 564 _all: all
 565 else
 566 _all: modules
 567 endif
 568
 569 # Decide whether to build built-in, modular, or both.
 570 # Normally, just do built-in.
 571
 572 KBUILD_MODULES :=
 573 KBUILD_BUILTIN := 1
 574
 575 # If we have only "make modules", don't compile built-in objects.
 576 # When we're building modules with modversions, we need to consider
 577 # the built-in objects during the descend as well, in order to
 578 # make sure the checksums are up to date before we record them.
 579
 580 ifeq ($(MAKECMDGOALS),modules)
 581   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 582 endif
 583
 584 # If we have "make <whatever> modules", compile modules
 585 # in addition to whatever we do anyway.
 586 # Just "make" or "make all" shall build modules as well
 587
 588 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 589   KBUILD_MODULES := 1
 590 endif
 591
 592 ifeq ($(MAKECMDGOALS),)
 593   KBUILD_MODULES := 1
 594 endif
 595
 596 export KBUILD_MODULES KBUILD_BUILTIN
 597
 598 ifeq ($(KBUILD_EXTMOD),)
 599 # Additional helpers built in scripts/
 600 # Carefully list dependencies so we do not try to build scripts twice
 601 # in parallel
 602 PHONY += scripts
 603 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 604          asm-generic gcc-plugins
 605         $(Q)$(MAKE) $(build)=$(@)
 606
 607 # Objects we will link into vmlinux / subdirs we need to visit
 608 init-y          := init/
 609 drivers-y       := drivers/ sound/ firmware/ ubuntu/
 610 net-y           := net/
 611 libs-y          := lib/
 612 core-y          := usr/
 613 virt-y          := virt/
 614 endif # KBUILD_EXTMOD
 615
 616 ifeq ($(dot-config),1)
 617 # Read in config
 618 -include include/config/auto.conf
 619
 620 ifeq ($(may-sync-config),1)
 621 # Read in dependencies to all Kconfig* files, make sure to run
 622 # oldconfig if changes are detected.
 623 -include include/config/auto.conf.cmd
 624
 625 # To avoid any implicit rule to kick in, define an empty command
 626 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 627
 628 # If .config is newer than include/config/auto.conf, someone tinkered
 629 # with it and forgot to run make oldconfig.
 630 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 631 # we execute the config step to be sure to catch updated Kconfig files
 632 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 633         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 634 else
 635 # External modules and some install targets need include/generated/autoconf.h
 636 # and include/config/auto.conf but do not care if they are up-to-date.
 637 # Use auto.conf to trigger the test
 638 PHONY += include/config/auto.conf
 639
 640 include/config/auto.conf:
 641         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 642         echo >&2;                                                       \
 643         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 644         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 645         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 646         echo >&2 ;                                                      \
 647         /bin/false)
 648
 649 endif # may-sync-config
 650
 651 else
 652 # Dummy target needed, because used as prerequisite
 653 include/config/auto.conf: ;
 654 endif # $(dot-config)
 655
 656 # For the kernel to actually contain only the needed exported symbols,
 657 # we have to build modules as well to determine what those symbols are.
 658 # (this can be evaluated only once include/config/auto.conf has been included)
 659 ifdef CONFIG_TRIM_UNUSED_KSYMS
 660   KBUILD_MODULES := 1
 661 endif
 662
 663 # The all: target is the default when no target is given on the
 664 # command line.
 665 # This allow a user to issue only 'make' to build a kernel including modules
 666 # Defaults to vmlinux, but the arch makefile usually adds further targets
 667 all: vmlinux
 668
 669 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 670 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 671 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 672 export CFLAGS_GCOV CFLAGS_KCOV
 673
 674 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 675 # values of the respective KBUILD_* variables
 676 ARCH_CPPFLAGS :=
 677 ARCH_AFLAGS :=
 678 ARCH_CFLAGS :=
 679 include arch/$(SRCARCH)/Makefile
 680
 681 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 682 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 683 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 684 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 685 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 686 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 687
 688 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 689 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 690 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 691 else
 692 ifdef CONFIG_PROFILE_ALL_BRANCHES
 693 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 694 else
 695 KBUILD_CFLAGS   += -O2
 696 endif
 697 endif
 698
 699 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 700                         $(call cc-disable-warning,maybe-uninitialized,))
 701
 702 # Tell gcc to never replace conditional load with a non-conditional one
 703 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 704
 705 # check for 'asm goto'
 706 ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 707         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 708         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 709 endif
 710
 711 include scripts/Makefile.kcov
 712 include scripts/Makefile.gcc-plugins
 713
 714 ifdef CONFIG_READABLE_ASM
 715 # Disable optimizations that make assembler listings hard to read.
 716 # reorder blocks reorders the control in the function
 717 # ipa clone creates specialized cloned functions
 718 # partial inlining inlines only parts of functions
 719 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 720                  $(call cc-option,-fno-ipa-cp-clone,) \
 721                  $(call cc-option,-fno-partial-inlining)
 722 endif
 723
 724 ifneq ($(CONFIG_FRAME_WARN),0)
 725 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 726 endif
 727
 728 # This selects the stack protector compiler flag. Testing it is delayed
 729 # until after .config has been reprocessed, in the prepare-compiler-check
 730 # target.
 731 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 732   stackp-flag := -fstack-protector
 733   stackp-name := REGULAR
 734 else
 735 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 736   stackp-flag := -fstack-protector-strong
 737   stackp-name := STRONG
 738 else
 739   # Force off for distro compilers that enable stack protector by default.
 740   stackp-flag := $(call cc-option, -fno-stack-protector)
 741 endif
 742 endif
 743 # Find arch-specific stack protector compiler sanity-checking script.
 744 ifdef CONFIG_CC_STACKPROTECTOR
 745   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 746   stackp-check := $(wildcard $(stackp-path))
 747 endif
 748 KBUILD_CFLAGS += $(stackp-flag)
 749
 750 ifeq ($(cc-name),clang)
 751 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 752 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 753 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 754 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 755 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 756 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 757 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 758 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 759 # See modpost pattern 2
 760 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 761 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 762 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 763 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 764 else
 765
 766 # These warnings generated too much noise in a regular build.
 767 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 768 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 769 endif
 770
 771 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 772 ifdef CONFIG_FRAME_POINTER
 773 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 774 else
 775 # Some targets (ARM with Thumb2, for example), can't be built with frame
 776 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 777 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 778 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 779 # -fomit-frame-pointer with FUNCTION_TRACER.
 780 ifndef CONFIG_FUNCTION_TRACER
 781 KBUILD_CFLAGS   += -fomit-frame-pointer
 782 endif
 783 endif
 784
 785 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 786
 787 ifdef CONFIG_DEBUG_INFO
 788 ifdef CONFIG_DEBUG_INFO_SPLIT
 789 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 790 else
 791 KBUILD_CFLAGS   += -g
 792 endif
 793 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 794 endif
 795 ifdef CONFIG_DEBUG_INFO_DWARF4
 796 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 797 endif
 798
 799 ifdef CONFIG_DEBUG_INFO_REDUCED
 800 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 801                    $(call cc-option,-fno-var-tracking)
 802 endif
 803
 804 ifdef CONFIG_FUNCTION_TRACER
 805 ifndef CC_FLAGS_FTRACE
 806 CC_FLAGS_FTRACE := -pg
 807 endif
 808 export CC_FLAGS_FTRACE
 809 ifdef CONFIG_HAVE_FENTRY
 810 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 811 endif
 812 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 813 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 814 ifdef CONFIG_DYNAMIC_FTRACE
 815         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 816                 BUILD_C_RECORDMCOUNT := y
 817                 export BUILD_C_RECORDMCOUNT
 818         endif
 819 endif
 820 endif
 821
 822 # We trigger additional mismatches with less inlining
 823 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 824 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 825 endif
 826
 827 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 828 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 829 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 830 endif
 831
 832 # arch Makefile may override CC so keep this after arch Makefile is included
 833 NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
 834 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 835
 836 # warn about C99 declaration after statement
 837 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 838
 839 # disable pointer signed / unsigned warnings in gcc 4.0
 840 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 841
 842 # disable invalid "can't wrap" optimizations for signed / pointers
 843 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 844
 845 # clang sets -fmerge-all-constants by default as optimization, but this
 846 # is non-conforming behavior for C and in fact breaks the kernel, so we
 847 # need to disable it here generally.
 848 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 849
 850 # for gcc -fno-merge-all-constants disables everything, but it is fine
 851 # to have actual conforming behavior enabled.
 852 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 853
 854 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 855 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 856
 857 # conserve stack if available
 858 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 859
 860 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 861 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 862
 863 # require functions to have arguments in prototypes, not empty 'int foo()'
 864 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 865
 866 # Prohibit date/time macros, which would make the build non-deterministic
 867 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 868
 869 # enforce correct pointer usage
 870 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 871
 872 # Require designated initializers for all marked structures
 873 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 874
 875 # use the deterministic mode of AR if available
 876 KBUILD_ARFLAGS := $(call ar-option,D)
 877
 878 include scripts/Makefile.kasan
 879 include scripts/Makefile.extrawarn
 880 include scripts/Makefile.ubsan
 881
 882 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 883 # last assignments
 884 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 885 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 886 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 887
 888 # Use --build-id when available.
 889 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 890                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 891 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 892 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 893
 894 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 895 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 896 endif
 897
 898 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 899 LDFLAGS_vmlinux += $(call ld-option, -X,)
 900 endif
 901
 902 # Default kernel image to build when no specific target is given.
 903 # KBUILD_IMAGE may be overruled on the command line or
 904 # set in the environment
 905 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 906 # this default value
 907 export KBUILD_IMAGE ?= vmlinux
 908
 909 #
 910 # INSTALL_PATH specifies where to place the updated kernel and system map
 911 # images. Default is /boot, but you can set it to other values
 912 export  INSTALL_PATH ?= /boot
 913
 914 #
 915 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 916 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 917 # an argument if needed. Otherwise it defaults to the kernel install path
 918 #
 919 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 920
 921 #
 922 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 923 # relocations required by build roots.  This is not defined in the
 924 # makefile but the argument can be passed to make if needed.
 925 #
 926
 927 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 928 export MODLIB
 929
 930 #
 931 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 932 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 933 # the default option --strip-debug will be used.  Otherwise,
 934 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 935
 936 ifdef INSTALL_MOD_STRIP
 937 ifeq ($(INSTALL_MOD_STRIP),1)
 938 mod_strip_cmd = $(STRIP) --strip-debug
 939 else
 940 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 941 endif # INSTALL_MOD_STRIP=1
 942 else
 943 mod_strip_cmd = true
 944 endif # INSTALL_MOD_STRIP
 945 export mod_strip_cmd
 946
 947 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 948 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 949 # or CONFIG_MODULE_COMPRESS_XZ.
 950
 951 mod_compress_cmd = true
 952 ifdef CONFIG_MODULE_COMPRESS
 953   ifdef CONFIG_MODULE_COMPRESS_GZIP
 954     mod_compress_cmd = gzip -n -f
 955   endif # CONFIG_MODULE_COMPRESS_GZIP
 956   ifdef CONFIG_MODULE_COMPRESS_XZ
 957     mod_compress_cmd = xz -f
 958   endif # CONFIG_MODULE_COMPRESS_XZ
 959 endif # CONFIG_MODULE_COMPRESS
 960 export mod_compress_cmd
 961
 962 # Select initial ramdisk compression format, default is gzip(1).
 963 # This shall be used by the dracut(8) tool while creating an initramfs image.
 964 #
 965 INITRD_COMPRESS-y                  := gzip
 966 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 967 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 968 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 969 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 970 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 971 # do not export INITRD_COMPRESS, since we didn't actually
 972 # choose a sane default compression above.
 973 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 974
 975 ifdef CONFIG_MODULE_SIG_ALL
 976 $(eval $(call config_filename,MODULE_SIG_KEY))
 977
 978 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 979 else
 980 mod_sign_cmd = true
 981 endif
 982 export mod_sign_cmd
 983
 984 ifdef CONFIG_STACK_VALIDATION
 985   has_libelf := $(call try-run,\
 986                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 987   ifeq ($(has_libelf),1)
 988     objtool_target := tools/objtool FORCE
 989   else
 990     ifdef CONFIG_UNWINDER_ORC
 991       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 992     else
 993       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 994     endif
 995     SKIP_STACK_VALIDATION := 1
 996     export SKIP_STACK_VALIDATION
 997   endif
 998 endif
 999
1000
1001 ifeq ($(KBUILD_EXTMOD),)
1002 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1003
1004 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1005                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1006                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1007
1008 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
1009                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1010
1011 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
1012 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
1013 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
1014 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
1015 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1016 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
1017 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
1018
1019 # Externally visible symbols (used by link-vmlinux.sh)
1020 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1021 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1022 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1023 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1024 export LDFLAGS_vmlinux
1025 # used by scripts/package/Makefile
1026 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1027
1028 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1029
1030 # Include targets which we want to execute sequentially if the rest of the
1031 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1032 # evaluated more than once.
1033 PHONY += vmlinux_prereq
1034 vmlinux_prereq: $(vmlinux-deps) FORCE
1035 ifdef CONFIG_HEADERS_CHECK
1036         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1037 endif
1038 ifdef CONFIG_GDB_SCRIPTS
1039         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1040 endif
1041 ifdef CONFIG_TRIM_UNUSED_KSYMS
1042         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1043           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1044 endif
1045
1046 # standalone target for easier testing
1047 include/generated/autoksyms.h: FORCE
1048         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1049
1050 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1051
1052 # Final link of vmlinux with optional arch pass after final link
1053 cmd_link-vmlinux =                                                 \
1054         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1055         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1056
1057 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1058         +$(call if_changed,link-vmlinux)
1059
1060 # Build samples along the rest of the kernel
1061 ifdef CONFIG_SAMPLES
1062 vmlinux-dirs += samples
1063 endif
1064
1065 # The actual objects are generated when descending,
1066 # make sure no implicit rule kicks in
1067 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1068
1069 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1070 # Preset locale variables to speed up the build process. Limit locale
1071 # tweaks to this spot to avoid wrong language settings when running
1072 # make menuconfig etc.
1073 # Error messages still appears in the original language
1074
1075 PHONY += $(vmlinux-dirs)
1076 $(vmlinux-dirs): prepare scripts
1077         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1078
1079 define filechk_kernel.release
1080         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1081 endef
1082
1083 # Store (new) KERNELRELEASE string in include/config/kernel.release
1084 include/config/kernel.release: include/config/auto.conf FORCE
1085         $(call filechk,kernel.release)
1086
1087
1088 # Things we need to do before we recursively start building the kernel
1089 # or the modules are listed in "prepare".
1090 # A multi level approach is used. prepareN is processed before prepareN-1.
1091 # archprepare is used in arch Makefiles and when processed asm symlink,
1092 # version.h and scripts_basic is processed / created.
1093
1094 # Listed in dependency order
1095 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1096
1097 # prepare3 is used to check if we are building in a separate output directory,
1098 # and if so do:
1099 # 1) Check that make has not been executed in the kernel src $(srctree)
1100 prepare3: include/config/kernel.release
1101 ifneq ($(KBUILD_SRC),)
1102         @$(kecho) '  Using $(srctree) as source for kernel'
1103         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1104                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1105                 echo >&2 "  in the '$(srctree)' directory.";\
1106                 /bin/false; \
1107         fi;
1108 endif
1109
1110 # prepare2 creates a makefile if using a separate output directory.
1111 # From this point forward, .config has been reprocessed, so any rules
1112 # that need to depend on updated CONFIG_* values can be checked here.
1113 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1114
1115 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1116                    include/config/auto.conf
1117         $(cmd_crmodverdir)
1118
1119 archprepare: archheaders archscripts prepare1 scripts_basic
1120
1121 prepare0: archprepare gcc-plugins
1122         $(Q)$(MAKE) $(build)=.
1123
1124 # All the preparing..
1125 prepare: prepare0 prepare-objtool
1126
1127 # Support for using generic headers in asm-generic
1128 PHONY += asm-generic uapi-asm-generic
1129 asm-generic: uapi-asm-generic
1130         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1131                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1132 uapi-asm-generic:
1133         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1134                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1135
1136 PHONY += prepare-objtool
1137 prepare-objtool: $(objtool_target)
1138
1139 # Check for CONFIG flags that require compiler support. Abort the build
1140 # after .config has been processed, but before the kernel build starts.
1141 #
1142 # For security-sensitive CONFIG options, we don't want to fallback and/or
1143 # silently change which compiler flags will be used, since that leads to
1144 # producing kernels with different security feature characteristics
1145 # depending on the compiler used. (For example, "But I selected
1146 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1147 PHONY += prepare-compiler-check
1148 prepare-compiler-check: FORCE
1149 # Make sure compiler supports requested stack protector flag.
1150 ifdef stackp-name
1151   ifeq ($(call cc-option, $(stackp-flag)),)
1152         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1153                   $(stackp-flag) not supported by compiler >&2 && exit 1
1154   endif
1155 endif
1156 # Make sure compiler does not have buggy stack-protector support.
1157 ifdef stackp-check
1158   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1159         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1160                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1161   endif
1162 endif
1163         @:
1164
1165 # Generate some files
1166 # ---------------------------------------------------------------------------
1167
1168 # KERNELRELEASE can change from a few different places, meaning version.h
1169 # needs to be updated, so this check is forced on all builds
1170
1171 uts_len := 64
1172 define filechk_utsrelease.h
1173         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1174           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1175           exit 1;                                                         \
1176         fi;                                                               \
1177         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1178 endef
1179
1180 define filechk_version.h
1181         (echo \#define LINUX_VERSION_CODE $(shell                         \
1182         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1183         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1184 endef
1185
1186 $(version_h): $(srctree)/Makefile FORCE
1187         $(call filechk,version.h)
1188         $(Q)rm -f $(old_version_h)
1189
1190 include/generated/utsrelease.h: include/config/kernel.release FORCE
1191         $(call filechk,utsrelease.h)
1192
1193 PHONY += headerdep
1194 headerdep:
1195         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1196         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1197
1198 # ---------------------------------------------------------------------------
1199 # Kernel headers
1200
1201 #Default location for installed headers
1202 export INSTALL_HDR_PATH = $(objtree)/usr
1203
1204 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1205 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1206
1207 PHONY += archheaders
1208 archheaders:
1209
1210 PHONY += archscripts
1211 archscripts:
1212
1213 PHONY += __headers
1214 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1215         $(Q)$(MAKE) $(build)=scripts build_unifdef
1216
1217 PHONY += headers_install_all
1218 headers_install_all:
1219         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1220
1221 PHONY += headers_install
1222 headers_install: __headers
1223         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1224           $(error Headers not exportable for the $(SRCARCH) architecture))
1225         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1226         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1227         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1228
1229 PHONY += headers_check_all
1230 headers_check_all: headers_install_all
1231         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1232
1233 PHONY += headers_check
1234 headers_check: headers_install
1235         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1236         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1237         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1238
1239 # ---------------------------------------------------------------------------
1240 # Kernel selftest
1241
1242 PHONY += kselftest
1243 kselftest:
1244         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1245
1246 PHONY += kselftest-clean
1247 kselftest-clean:
1248         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1249
1250 PHONY += kselftest-merge
1251 kselftest-merge:
1252         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1253         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1254                 -m $(objtree)/.config \
1255                 $(srctree)/tools/testing/selftests/*/config
1256         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1257
1258 # ---------------------------------------------------------------------------
1259 # Modules
1260
1261 ifdef CONFIG_MODULES
1262
1263 # By default, build modules as well
1264
1265 all: modules
1266
1267 # Build modules
1268 #
1269 # A module can be listed more than once in obj-m resulting in
1270 # duplicate lines in modules.order files.  Those are removed
1271 # using awk while concatenating to the final file.
1272
1273 PHONY += modules
1274 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1275         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1276         @$(kecho) '  Building modules, stage 2.';
1277         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1278
1279 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1280         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1281
1282 %/modules.builtin: include/config/auto.conf
1283         $(Q)$(MAKE) $(modbuiltin)=$*
1284
1285
1286 # Target to prepare building external modules
1287 PHONY += modules_prepare
1288 modules_prepare: prepare scripts
1289
1290 # Target to install modules
1291 PHONY += modules_install
1292 modules_install: _modinst_ _modinst_post
1293
1294 PHONY += _modinst_
1295 _modinst_:
1296         @rm -rf $(MODLIB)/kernel
1297         @rm -f $(MODLIB)/source
1298         @mkdir -p $(MODLIB)/kernel
1299         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1300         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1301                 rm -f $(MODLIB)/build ; \
1302                 ln -s $(CURDIR) $(MODLIB)/build ; \
1303         fi
1304         @cp -f $(objtree)/modules.order $(MODLIB)/
1305         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1306         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1307
1308 # This depmod is only for convenience to give the initial
1309 # boot a modules.dep even before / is mounted read-write.  However the
1310 # boot script depmod is the master version.
1311 PHONY += _modinst_post
1312 _modinst_post: _modinst_
1313         $(call cmd,depmod)
1314
1315 ifeq ($(CONFIG_MODULE_SIG), y)
1316 PHONY += modules_sign
1317 modules_sign:
1318         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1319 endif
1320
1321 else # CONFIG_MODULES
1322
1323 # Modules not configured
1324 # ---------------------------------------------------------------------------
1325
1326 PHONY += modules modules_install
1327 modules modules_install:
1328         @echo >&2
1329         @echo >&2 "The present kernel configuration has modules disabled."
1330         @echo >&2 "Type 'make config' and enable loadable module support."
1331         @echo >&2 "Then build a kernel with module support enabled."
1332         @echo >&2
1333         @exit 1
1334
1335 endif # CONFIG_MODULES
1336
1337 ###
1338 # Cleaning is done on three levels.
1339 # make clean     Delete most generated files
1340 #                Leave enough to build external modules
1341 # make mrproper  Delete the current configuration, and all generated files
1342 # make distclean Remove editor backup files, patch leftover files and the like
1343
1344 # Directories & files removed with 'make clean'
1345 CLEAN_DIRS  += $(MODVERDIR)
1346
1347 # Directories & files removed with 'make mrproper'
1348 MRPROPER_DIRS  += include/config usr/include include/generated          \
1349                   arch/*/include/generated .tmp_objdiff
1350 MRPROPER_FILES += .config .config.old .version \
1351                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1352                   signing_key.pem signing_key.priv signing_key.x509     \
1353                   x509.genkey extra_certificates signing_key.x509.keyid \
1354                   signing_key.x509.signer vmlinux-gdb.py
1355
1356 # clean - Delete most, but leave enough to build external modules
1357 #
1358 clean: rm-dirs  := $(CLEAN_DIRS)
1359 clean: rm-files := $(CLEAN_FILES)
1360 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1361
1362 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1363 $(clean-dirs):
1364         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1365
1366 vmlinuxclean:
1367         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1368         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1369
1370 clean: archclean vmlinuxclean
1371
1372 # mrproper - Delete all generated files, including .config
1373 #
1374 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1375 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1376 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1377
1378 PHONY += $(mrproper-dirs) mrproper archmrproper
1379 $(mrproper-dirs):
1380         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1381
1382 mrproper: clean archmrproper $(mrproper-dirs)
1383         $(call cmd,rmdirs)
1384         $(call cmd,rmfiles)
1385
1386 # distclean
1387 #
1388 PHONY += distclean
1389
1390 distclean: mrproper
1391         @find $(srctree) $(RCS_FIND_IGNORE) \
1392                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1393                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1394                 -o -name 'core' \) \
1395                 -type f -print | xargs rm -f
1396
1397
1398 # Packaging of the kernel to various formats
1399 # ---------------------------------------------------------------------------
1400 # rpm target kept for backward compatibility
1401 package-dir     := scripts/package
1402
1403 %src-pkg: FORCE
1404         $(Q)$(MAKE) $(build)=$(package-dir) $@
1405 %pkg: include/config/kernel.release FORCE
1406         $(Q)$(MAKE) $(build)=$(package-dir) $@
1407 rpm: rpm-pkg
1408         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1409         @echo "           Please use \"rpm-pkg\" instead."
1410
1411
1412 # Brief documentation of the typical targets used
1413 # ---------------------------------------------------------------------------
1414
1415 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1416 boards := $(sort $(notdir $(boards)))
1417 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1418 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1419
1420 PHONY += help
1421 help:
1422         @echo  'Cleaning targets:'
1423         @echo  '  clean           - Remove most generated files but keep the config and'
1424         @echo  '                    enough build support to build external modules'
1425         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1426         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1427         @echo  ''
1428         @echo  'Configuration targets:'
1429         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1430         @echo  ''
1431         @echo  'Other generic targets:'
1432         @echo  '  all             - Build all targets marked with [*]'
1433         @echo  '* vmlinux         - Build the bare kernel'
1434         @echo  '* modules         - Build all modules'
1435         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1436         @echo  '  dir/            - Build all files in dir and below'
1437         @echo  '  dir/file.[ois]  - Build specified target only'
1438         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1439         @echo  '                    (requires compiler support for LLVM assembly generation)'
1440         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1441         @echo  '                    (requires a recent binutils and recent build (System.map))'
1442         @echo  '  dir/file.ko     - Build module including final link'
1443         @echo  '  modules_prepare - Set up for building external modules'
1444         @echo  '  tags/TAGS       - Generate tags file for editors'
1445         @echo  '  cscope          - Generate cscope index'
1446         @echo  '  gtags           - Generate GNU GLOBAL index'
1447         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1448         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1449         @echo  '  image_name      - Output the image name (use with make -s)'
1450         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1451          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1452          echo  ''
1453         @echo  'Static analysers:'
1454         @echo  '  checkstack      - Generate a list of stack hogs'
1455         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1456         @echo  '  versioncheck    - Sanity check on version.h usage'
1457         @echo  '  includecheck    - Check for duplicate included header files'
1458         @echo  '  export_report   - List the usages of all exported symbols'
1459         @echo  '  headers_check   - Sanity check on exported headers'
1460         @echo  '  headerdep       - Detect inclusion cycles in headers'
1461         @echo  '  coccicheck      - Check with Coccinelle'
1462         @echo  ''
1463         @echo  'Kernel selftest:'
1464         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1465         @echo  '                    Build, install, and boot kernel before'
1466         @echo  '                    running kselftest on it'
1467         @echo  '  kselftest-clean - Remove all generated kselftest files'
1468         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1469         @echo  '                    .config.'
1470         @echo  ''
1471         @echo 'Userspace tools targets:'
1472         @echo '  use "make tools/help"'
1473         @echo '  or  "cd tools; make help"'
1474         @echo  ''
1475         @echo  'Kernel packaging:'
1476         @$(MAKE) $(build)=$(package-dir) help
1477         @echo  ''
1478         @echo  'Documentation targets:'
1479         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1480         @echo  ''
1481         @echo  'Architecture specific targets ($(SRCARCH)):'
1482         @$(if $(archhelp),$(archhelp),\
1483                 echo '  No architecture specific help defined for $(SRCARCH)')
1484         @echo  ''
1485         @$(if $(boards), \
1486                 $(foreach b, $(boards), \
1487                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1488                 echo '')
1489         @$(if $(board-dirs), \
1490                 $(foreach b, $(board-dirs), \
1491                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1492                 printf "  %-16s - Show all of the above\\n" help-boards; \
1493                 echo '')
1494
1495         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1496         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1497         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1498         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1499         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1500         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1501         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1502         @echo  '                1: warnings which may be relevant and do not occur too often'
1503         @echo  '                2: warnings which occur quite often but may still be relevant'
1504         @echo  '                3: more obscure warnings, can most likely be ignored'
1505         @echo  '                Multiple levels can be combined with W=12 or W=123'
1506         @echo  ''
1507         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1508         @echo  'For further info see the ./README file'
1509
1510
1511 help-board-dirs := $(addprefix help-,$(board-dirs))
1512
1513 help-boards: $(help-board-dirs)
1514
1515 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1516
1517 $(help-board-dirs): help-%:
1518         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1519         @$(if $(boards-per-dir), \
1520                 $(foreach b, $(boards-per-dir), \
1521                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1522                 echo '')
1523
1524
1525 # Documentation targets
1526 # ---------------------------------------------------------------------------
1527 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1528                linkcheckdocs dochelp refcheckdocs
1529 PHONY += $(DOC_TARGETS)
1530 $(DOC_TARGETS): scripts_basic FORCE
1531         $(Q)$(MAKE) $(build)=Documentation $@
1532
1533 else # KBUILD_EXTMOD
1534
1535 ###
1536 # External module support.
1537 # When building external modules the kernel used as basis is considered
1538 # read-only, and no consistency checks are made and the make
1539 # system is not used on the basis kernel. If updates are required
1540 # in the basis kernel ordinary make commands (without M=...) must
1541 # be used.
1542 #
1543 # The following are the only valid targets when building external
1544 # modules.
1545 # make M=dir clean     Delete all automatically generated files
1546 # make M=dir modules   Make all modules in specified dir
1547 # make M=dir           Same as 'make M=dir modules'
1548 # make M=dir modules_install
1549 #                      Install the modules built in the module directory
1550 #                      Assumes install directory is already created
1551
1552 # We are always building modules
1553 KBUILD_MODULES := 1
1554 PHONY += crmodverdir
1555 crmodverdir:
1556         $(cmd_crmodverdir)
1557
1558 PHONY += $(objtree)/Module.symvers
1559 $(objtree)/Module.symvers:
1560         @test -e $(objtree)/Module.symvers || ( \
1561         echo; \
1562         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1563         echo "           is missing; modules will have no dependencies and modversions."; \
1564         echo )
1565
1566 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1567 PHONY += $(module-dirs) modules
1568 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1569         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1570
1571 modules: $(module-dirs)
1572         @$(kecho) '  Building modules, stage 2.';
1573         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1574
1575 PHONY += modules_install
1576 modules_install: _emodinst_ _emodinst_post
1577
1578 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1579 PHONY += _emodinst_
1580 _emodinst_:
1581         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1582         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1583
1584 PHONY += _emodinst_post
1585 _emodinst_post: _emodinst_
1586         $(call cmd,depmod)
1587
1588 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1589
1590 PHONY += $(clean-dirs) clean
1591 $(clean-dirs):
1592         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1593
1594 clean:  rm-dirs := $(MODVERDIR)
1595 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1596
1597 PHONY += help
1598 help:
1599         @echo  '  Building external modules.'
1600         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1601         @echo  ''
1602         @echo  '  modules         - default target, build the module(s)'
1603         @echo  '  modules_install - install the module'
1604         @echo  '  clean           - remove generated files in module directory only'
1605         @echo  ''
1606
1607 # Dummies...
1608 PHONY += prepare scripts
1609 prepare: ;
1610 scripts: ;
1611 endif # KBUILD_EXTMOD
1612
1613 clean: $(clean-dirs)
1614         $(call cmd,rmdirs)
1615         $(call cmd,rmfiles)
1616         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1617                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1618                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1619                 -o -name '*.dwo' -o -name '*.lst' \
1620                 -o -name '*.su'  \
1621                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1622                 -o -name '*.symtypes' -o -name 'modules.order' \
1623                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1624                 -o -name .cache.mk \
1625                 -o -name '*.c.[012]*.*' \
1626                 -o -name '*.ll' \
1627                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1628
1629 # Generate tags for editors
1630 # ---------------------------------------------------------------------------
1631 quiet_cmd_tags = GEN     $@
1632       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1633
1634 tags TAGS cscope gtags: FORCE
1635         $(call cmd,tags)
1636
1637 # Scripts to check various things for consistency
1638 # ---------------------------------------------------------------------------
1639
1640 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1641
1642 includecheck:
1643         find $(srctree)/* $(RCS_FIND_IGNORE) \
1644                 -name '*.[hcS]' -type f -print | sort \
1645                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1646
1647 versioncheck:
1648         find $(srctree)/* $(RCS_FIND_IGNORE) \
1649                 -name '*.[hcS]' -type f -print | sort \
1650                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1651
1652 coccicheck:
1653         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1654
1655 namespacecheck:
1656         $(PERL) $(srctree)/scripts/namespace.pl
1657
1658 export_report:
1659         $(PERL) $(srctree)/scripts/export_report.pl
1660
1661 endif #ifeq ($(config-targets),1)
1662 endif #ifeq ($(mixed-targets),1)
1663
1664 PHONY += checkstack kernelrelease kernelversion image_name
1665
1666 # UML needs a little special treatment here.  It wants to use the host
1667 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1668 # else wants $(ARCH), including people doing cross-builds, which means
1669 # that $(SUBARCH) doesn't work here.
1670 ifeq ($(ARCH), um)
1671 CHECKSTACK_ARCH := $(SUBARCH)
1672 else
1673 CHECKSTACK_ARCH := $(ARCH)
1674 endif
1675 checkstack:
1676         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1677         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1678
1679 kernelrelease:
1680         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1681
1682 kernelversion:
1683         @echo $(KERNELVERSION)
1684
1685 image_name:
1686         @echo $(KBUILD_IMAGE)
1687
1688 # Clear a bunch of variables before executing the submake
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 tools/%: FORCE
1694         $(Q)mkdir -p $(objtree)/tools
1695         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1696
1697 # Single targets
1698 # ---------------------------------------------------------------------------
1699 # Single targets are compatible with:
1700 # - build with mixed source and output
1701 # - build with separate output dir 'make O=...'
1702 # - external modules
1703 #
1704 #  target-dir => where to store outputfile
1705 #  build-dir  => directory in kernel source tree to use
1706
1707 ifeq ($(KBUILD_EXTMOD),)
1708         build-dir  = $(patsubst %/,%,$(dir $@))
1709         target-dir = $(dir $@)
1710 else
1711         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1712         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1713         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1714 endif
1715
1716 %.s: %.c prepare scripts FORCE
1717         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1718 %.i: %.c prepare scripts FORCE
1719         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1720 %.o: %.c prepare scripts FORCE
1721         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1722 %.lst: %.c prepare scripts FORCE
1723         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1724 %.s: %.S prepare scripts FORCE
1725         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1726 %.o: %.S prepare scripts FORCE
1727         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1728 %.symtypes: %.c prepare scripts FORCE
1729         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1730 %.ll: %.c prepare scripts FORCE
1731         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1732
1733 # Modules
1734 /: prepare scripts FORCE
1735         $(cmd_crmodverdir)
1736         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1737         $(build)=$(build-dir)
1738 # Make sure the latest headers are built for Documentation
1739 Documentation/ samples/: headers_install
1740 %/: prepare scripts FORCE
1741         $(cmd_crmodverdir)
1742         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1743         $(build)=$(build-dir)
1744 %.ko: prepare scripts FORCE
1745         $(cmd_crmodverdir)
1746         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1747         $(build)=$(build-dir) $(@:.ko=.o)
1748         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1749
1750 # FIXME Should go into a make.lib or something
1751 # ===========================================================================
1752
1753 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1754       cmd_rmdirs = rm -rf $(rm-dirs)
1755
1756 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1757       cmd_rmfiles = rm -f $(rm-files)
1758
1759 # Run depmod only if we have System.map and depmod is executable
1760 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1761       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1762                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1763
1764 # Create temporary dir for module support files
1765 # clean it up only when building all modules
1766 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1767                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1768
1769 # read all saved command lines
1770
1771 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1772
1773 ifneq ($(cmd_files),)
1774   $(cmd_files): ;       # Do not try to update included dependency files
1775   include $(cmd_files)
1776 endif
1777
1778 endif   # skip-makefile
1779
1780 PHONY += FORCE
1781 FORCE:
1782
1783 # Declare the contents of the .PHONY variable as phony.  We keep that
1784 # information in a variable so we can use it in if_changed and friends.
1785 .PHONY: $(PHONY)