Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 16
   4 SUBLEVEL = 8
   5 EXTRAVERSION =
   6 NAME = Fearless Coyote
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.o targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Use make M=dir to specify directory of external module to build
 180 # Old syntax make ... SUBDIRS=$PWD is still supported
 181 # Setting the environment variable KBUILD_EXTMOD take precedence
 182 ifdef SUBDIRS
 183   KBUILD_EXTMOD ?= $(SUBDIRS)
 184 endif
 185
 186 ifeq ("$(origin M)", "command line")
 187   KBUILD_EXTMOD := $(M)
 188 endif
 189
 190 ifeq ($(KBUILD_SRC),)
 191         # building in the source tree
 192         srctree := .
 193 else
 194         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 195                 # building in a subdirectory of the source tree
 196                 srctree := ..
 197         else
 198                 srctree := $(KBUILD_SRC)
 199         endif
 200 endif
 201
 202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 203
 204 objtree         := .
 205 src             := $(srctree)
 206 obj             := $(objtree)
 207
 208 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 209
 210 export srctree objtree VPATH
 211
 212 # To make sure we do not include .config for any of the *config targets
 213 # catch them early, and hand them over to scripts/kconfig/Makefile
 214 # It is allowed to specify more targets when calling make, including
 215 # mixing *config targets and build targets.
 216 # For example 'make oldconfig all'.
 217 # Detect when mixed targets is specified, and make a second invocation
 218 # of make so .config is not included in this case either (for *config).
 219
 220 version_h := include/generated/uapi/linux/version.h
 221 old_version_h := include/linux/version.h
 222
 223 no-dot-config-targets := clean mrproper distclean \
 224                          cscope gtags TAGS tags help% %docs check% coccicheck \
 225                          $(version_h) headers_% archheaders archscripts \
 226                          kernelversion %src-pkg
 227
 228 config-targets := 0
 229 mixed-targets  := 0
 230 dot-config     := 1
 231
 232 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 233         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 234                 dot-config := 0
 235         endif
 236 endif
 237
 238 ifeq ($(KBUILD_EXTMOD),)
 239         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 240                 config-targets := 1
 241                 ifneq ($(words $(MAKECMDGOALS)),1)
 242                         mixed-targets := 1
 243                 endif
 244         endif
 245 endif
 246 # install and modules_install need also be processed one by one
 247 ifneq ($(filter install,$(MAKECMDGOALS)),)
 248         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 249                 mixed-targets := 1
 250         endif
 251 endif
 252
 253 ifeq ($(mixed-targets),1)
 254 # ===========================================================================
 255 # We're called with mixed targets (*config and build targets).
 256 # Handle them one by one.
 257
 258 PHONY += $(MAKECMDGOALS) __build_one_by_one
 259
 260 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 261         @:
 262
 263 __build_one_by_one:
 264         $(Q)set -e; \
 265         for i in $(MAKECMDGOALS); do \
 266                 $(MAKE) -f $(srctree)/Makefile $$i; \
 267         done
 268
 269 else
 270
 271 # We need some generic definitions (do not try to remake the file).
 272 scripts/Kbuild.include: ;
 273 include scripts/Kbuild.include
 274
 275 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 276 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 277 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 278 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 279
 280 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 281 # first, and if a usermode build is happening, the "ARCH=um" on the command
 282 # line overrides the setting of ARCH below.  If a native build is happening,
 283 # then ARCH is assigned, getting whatever value it gets normally, and
 284 # SUBARCH is subsequently ignored.
 285
 286 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 287                                   -e s/sun4u/sparc64/ \
 288                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 289                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 290                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 291                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
 292                                   -e s/riscv.*/riscv/)
 293
 294 # Cross compiling and selecting different set of gcc/bin-utils
 295 # ---------------------------------------------------------------------------
 296 #
 297 # When performing cross compilation for other architectures ARCH shall be set
 298 # to the target architecture. (See arch/* for the possibilities).
 299 # ARCH can be set during invocation of make:
 300 # make ARCH=ia64
 301 # Another way is to have ARCH set in the environment.
 302 # The default ARCH is the host where make is executed.
 303
 304 # CROSS_COMPILE specify the prefix used for all executables used
 305 # during compilation. Only gcc and related bin-utils executables
 306 # are prefixed with $(CROSS_COMPILE).
 307 # CROSS_COMPILE can be set on the command line
 308 # make CROSS_COMPILE=ia64-linux-
 309 # Alternatively CROSS_COMPILE can be set in the environment.
 310 # A third alternative is to store a setting in .config so that plain
 311 # "make" in the configured kernel build directory always uses that.
 312 # Default value for CROSS_COMPILE is not to prefix executables
 313 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 314 ARCH            ?= $(SUBARCH)
 315 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 316
 317 # Architecture as present in compile.h
 318 UTS_MACHINE     := $(ARCH)
 319 SRCARCH         := $(ARCH)
 320
 321 # Additional ARCH settings for x86
 322 ifeq ($(ARCH),i386)
 323         SRCARCH := x86
 324 endif
 325 ifeq ($(ARCH),x86_64)
 326         SRCARCH := x86
 327 endif
 328
 329 # Additional ARCH settings for sparc
 330 ifeq ($(ARCH),sparc32)
 331        SRCARCH := sparc
 332 endif
 333 ifeq ($(ARCH),sparc64)
 334        SRCARCH := sparc
 335 endif
 336
 337 # Additional ARCH settings for sh
 338 ifeq ($(ARCH),sh64)
 339        SRCARCH := sh
 340 endif
 341
 342 # Additional ARCH settings for tile
 343 ifeq ($(ARCH),tilepro)
 344        SRCARCH := tile
 345 endif
 346 ifeq ($(ARCH),tilegx)
 347        SRCARCH := tile
 348 endif
 349
 350 KCONFIG_CONFIG  ?= .config
 351 export KCONFIG_CONFIG
 352
 353 # SHELL used by kbuild
 354 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 355           else if [ -x /bin/bash ]; then echo /bin/bash; \
 356           else echo sh; fi ; fi)
 357
 358 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
 359 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
 360 HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
 361
 362 HOSTCC       = gcc
 363 HOSTCXX      = g++
 364 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 365                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 366 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 367 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 368 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 369
 370 # Make variables (CC, etc...)
 371 AS              = $(CROSS_COMPILE)as
 372 LD              = $(CROSS_COMPILE)ld
 373 CC              = $(CROSS_COMPILE)gcc
 374 CPP             = $(CC) -E
 375 AR              = $(CROSS_COMPILE)ar
 376 NM              = $(CROSS_COMPILE)nm
 377 STRIP           = $(CROSS_COMPILE)strip
 378 OBJCOPY         = $(CROSS_COMPILE)objcopy
 379 OBJDUMP         = $(CROSS_COMPILE)objdump
 380 LEX             = flex
 381 YACC            = bison
 382 AWK             = awk
 383 GENKSYMS        = scripts/genksyms/genksyms
 384 INSTALLKERNEL  := installkernel
 385 DEPMOD          = /sbin/depmod
 386 PERL            = perl
 387 PYTHON          = python
 388 CHECK           = sparse
 389
 390 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 391                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 392 NOSTDINC_FLAGS  =
 393 CFLAGS_MODULE   =
 394 AFLAGS_MODULE   =
 395 LDFLAGS_MODULE  =
 396 CFLAGS_KERNEL   =
 397 AFLAGS_KERNEL   =
 398 LDFLAGS_vmlinux =
 399
 400 # Use USERINCLUDE when you must reference the UAPI directories only.
 401 USERINCLUDE    := \
 402                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 403                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 404                 -I$(srctree)/include/uapi \
 405                 -I$(objtree)/include/generated/uapi \
 406                 -include $(srctree)/include/linux/kconfig.h
 407
 408 # Use LINUXINCLUDE when you must reference the include/ directory.
 409 # Needed to be compatible with the O= option
 410 LINUXINCLUDE    := \
 411                 -I$(srctree)/arch/$(SRCARCH)/include \
 412                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 413                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 414                 -I$(objtree)/include \
 415                 $(USERINCLUDE)
 416
 417 KBUILD_AFLAGS   := -D__ASSEMBLY__
 418 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 419                    -fno-strict-aliasing -fno-common -fshort-wchar \
 420                    -Werror-implicit-function-declaration \
 421                    -Wno-format-security \
 422                    -std=gnu89
 423 KBUILD_CPPFLAGS := -D__KERNEL__
 424 KBUILD_AFLAGS_KERNEL :=
 425 KBUILD_CFLAGS_KERNEL :=
 426 KBUILD_AFLAGS_MODULE  := -DMODULE
 427 KBUILD_CFLAGS_MODULE  := -DMODULE
 428 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 429 GCC_PLUGINS_CFLAGS :=
 430
 431 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 432 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 433 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 434 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 435
 436 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 437 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 438 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 439 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 440 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 441 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 442 export KBUILD_ARFLAGS
 443
 444 # When compiling out-of-tree modules, put MODVERDIR in the module
 445 # tree rather than in the kernel tree. The kernel tree might
 446 # even be read-only.
 447 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 448
 449 # Files to ignore in find ... statements
 450
 451 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 452                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 453                           -prune -o
 454 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 455                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 456
 457 # ===========================================================================
 458 # Rules shared between *config targets and build targets
 459
 460 # Basic helpers built in scripts/basic/
 461 PHONY += scripts_basic
 462 scripts_basic:
 463         $(Q)$(MAKE) $(build)=scripts/basic
 464         $(Q)rm -f .tmp_quiet_recordmcount
 465
 466 # To avoid any implicit rule to kick in, define an empty command.
 467 scripts/basic/%: scripts_basic ;
 468
 469 PHONY += outputmakefile
 470 # outputmakefile generates a Makefile in the output directory, if using a
 471 # separate output directory. This allows convenient use of make in the
 472 # output directory.
 473 outputmakefile:
 474 ifneq ($(KBUILD_SRC),)
 475         $(Q)ln -fsn $(srctree) source
 476         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 477             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 478 endif
 479
 480 ifeq ($(cc-name),clang)
 481 ifneq ($(CROSS_COMPILE),)
 482 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 483 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 484 endif
 485 ifneq ($(GCC_TOOLCHAIN),)
 486 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 487 endif
 488 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 489 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 490 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 491 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 492 endif
 493
 494 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 495 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 496 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 497 export RETPOLINE_CFLAGS
 498
 499 ifeq ($(config-targets),1)
 500 # ===========================================================================
 501 # *config targets only - make sure prerequisites are updated, and descend
 502 # in scripts/kconfig to make the *config target
 503
 504 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 505 # KBUILD_DEFCONFIG may point out an alternative default configuration
 506 # used for 'make defconfig'
 507 include arch/$(SRCARCH)/Makefile
 508 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 509
 510 config: scripts_basic outputmakefile FORCE
 511         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 512
 513 %config: scripts_basic outputmakefile FORCE
 514         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 515
 516 else
 517 # ===========================================================================
 518 # Build targets only - this includes vmlinux, arch specific targets, clean
 519 # targets and others. In general all targets except *config targets.
 520
 521 # If building an external module we do not care about the all: rule
 522 # but instead _all depend on modules
 523 PHONY += all
 524 ifeq ($(KBUILD_EXTMOD),)
 525 _all: all
 526 else
 527 _all: modules
 528 endif
 529
 530 # Decide whether to build built-in, modular, or both.
 531 # Normally, just do built-in.
 532
 533 KBUILD_MODULES :=
 534 KBUILD_BUILTIN := 1
 535
 536 # If we have only "make modules", don't compile built-in objects.
 537 # When we're building modules with modversions, we need to consider
 538 # the built-in objects during the descend as well, in order to
 539 # make sure the checksums are up to date before we record them.
 540
 541 ifeq ($(MAKECMDGOALS),modules)
 542   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 543 endif
 544
 545 # If we have "make <whatever> modules", compile modules
 546 # in addition to whatever we do anyway.
 547 # Just "make" or "make all" shall build modules as well
 548
 549 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 550   KBUILD_MODULES := 1
 551 endif
 552
 553 ifeq ($(MAKECMDGOALS),)
 554   KBUILD_MODULES := 1
 555 endif
 556
 557 export KBUILD_MODULES KBUILD_BUILTIN
 558
 559 ifeq ($(KBUILD_EXTMOD),)
 560 # Additional helpers built in scripts/
 561 # Carefully list dependencies so we do not try to build scripts twice
 562 # in parallel
 563 PHONY += scripts
 564 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 565          asm-generic gcc-plugins
 566         $(Q)$(MAKE) $(build)=$(@)
 567
 568 # Objects we will link into vmlinux / subdirs we need to visit
 569 init-y          := init/
 570 drivers-y       := drivers/ sound/ firmware/
 571 net-y           := net/
 572 libs-y          := lib/
 573 core-y          := usr/
 574 virt-y          := virt/
 575 endif # KBUILD_EXTMOD
 576
 577 ifeq ($(dot-config),1)
 578 # Read in config
 579 -include include/config/auto.conf
 580
 581 ifeq ($(KBUILD_EXTMOD),)
 582 # Read in dependencies to all Kconfig* files, make sure to run
 583 # oldconfig if changes are detected.
 584 -include include/config/auto.conf.cmd
 585
 586 # To avoid any implicit rule to kick in, define an empty command
 587 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 588
 589 # The actual configuration files used during the build are stored in
 590 # include/generated/ and include/config/. Update them if .config is newer than
 591 # include/config/auto.conf (which mirrors .config).
 592 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 593         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 594 else
 595 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 596 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 597 PHONY += include/config/auto.conf
 598
 599 include/config/auto.conf:
 600         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 601         echo >&2;                                                       \
 602         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 603         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 604         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 605         echo >&2 ;                                                      \
 606         /bin/false)
 607
 608 endif # KBUILD_EXTMOD
 609
 610 else
 611 # Dummy target needed, because used as prerequisite
 612 include/config/auto.conf: ;
 613 endif # $(dot-config)
 614
 615 # For the kernel to actually contain only the needed exported symbols,
 616 # we have to build modules as well to determine what those symbols are.
 617 # (this can be evaluated only once include/config/auto.conf has been included)
 618 ifdef CONFIG_TRIM_UNUSED_KSYMS
 619   KBUILD_MODULES := 1
 620 endif
 621
 622 # The all: target is the default when no target is given on the
 623 # command line.
 624 # This allow a user to issue only 'make' to build a kernel including modules
 625 # Defaults to vmlinux, but the arch makefile usually adds further targets
 626 all: vmlinux
 627
 628 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 629 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 630 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 631 export CFLAGS_GCOV CFLAGS_KCOV
 632
 633 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 634 # values of the respective KBUILD_* variables
 635 ARCH_CPPFLAGS :=
 636 ARCH_AFLAGS :=
 637 ARCH_CFLAGS :=
 638 include arch/$(SRCARCH)/Makefile
 639
 640 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 641 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 642 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 643 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 644 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 645
 646 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 647 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 648 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 649 else
 650 ifdef CONFIG_PROFILE_ALL_BRANCHES
 651 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 652 else
 653 KBUILD_CFLAGS   += -O2
 654 endif
 655 endif
 656
 657 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 658                         $(call cc-disable-warning,maybe-uninitialized,))
 659
 660 # Tell gcc to never replace conditional load with a non-conditional one
 661 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 662
 663 # check for 'asm goto'
 664 ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 665         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 666         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 667 endif
 668
 669 include scripts/Makefile.kcov
 670 include scripts/Makefile.gcc-plugins
 671
 672 ifdef CONFIG_READABLE_ASM
 673 # Disable optimizations that make assembler listings hard to read.
 674 # reorder blocks reorders the control in the function
 675 # ipa clone creates specialized cloned functions
 676 # partial inlining inlines only parts of functions
 677 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 678                  $(call cc-option,-fno-ipa-cp-clone,) \
 679                  $(call cc-option,-fno-partial-inlining)
 680 endif
 681
 682 ifneq ($(CONFIG_FRAME_WARN),0)
 683 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 684 endif
 685
 686 # This selects the stack protector compiler flag. Testing it is delayed
 687 # until after .config has been reprocessed, in the prepare-compiler-check
 688 # target.
 689 ifdef CONFIG_CC_STACKPROTECTOR_AUTO
 690   stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector))
 691   stackp-name := AUTO
 692 else
 693 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 694   stackp-flag := -fstack-protector
 695   stackp-name := REGULAR
 696 else
 697 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 698   stackp-flag := -fstack-protector-strong
 699   stackp-name := STRONG
 700 else
 701   # If either there is no stack protector for this architecture or
 702   # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name)
 703   # is empty, skipping all remaining stack protector tests.
 704   #
 705   # Force off for distro compilers that enable stack protector by default.
 706   KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 707 endif
 708 endif
 709 endif
 710 # Find arch-specific stack protector compiler sanity-checking script.
 711 ifdef stackp-name
 712 ifneq ($(stackp-flag),)
 713   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 714   stackp-check := $(wildcard $(stackp-path))
 715   # If the wildcard test matches a test script, run it to check functionality.
 716   ifdef stackp-check
 717     ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
 718       stackp-broken := y
 719     endif
 720   endif
 721   ifndef stackp-broken
 722     # If the stack protector is functional, enable code that depends on it.
 723     KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR
 724     # Either we've already detected the flag (for AUTO) or we'll fail the
 725     # build in the prepare-compiler-check rule (for specific flag).
 726     KBUILD_CFLAGS += $(stackp-flag)
 727   else
 728     # We have to make sure stack protector is unconditionally disabled if
 729     # the compiler is broken (in case we're going to continue the build in
 730     # AUTO mode).
 731     KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 732   endif
 733 endif
 734 endif
 735
 736 ifeq ($(cc-name),clang)
 737 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 738 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 739 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 740 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 741 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 742 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 743 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 744 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 745 # See modpost pattern 2
 746 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 747 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 748 else
 749
 750 # These warnings generated too much noise in a regular build.
 751 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 752 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 753 endif
 754
 755 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 756 ifdef CONFIG_FRAME_POINTER
 757 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 758 else
 759 # Some targets (ARM with Thumb2, for example), can't be built with frame
 760 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 761 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 762 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 763 # -fomit-frame-pointer with FUNCTION_TRACER.
 764 ifndef CONFIG_FUNCTION_TRACER
 765 KBUILD_CFLAGS   += -fomit-frame-pointer
 766 endif
 767 endif
 768
 769 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 770
 771 ifdef CONFIG_DEBUG_INFO
 772 ifdef CONFIG_DEBUG_INFO_SPLIT
 773 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 774 else
 775 KBUILD_CFLAGS   += -g
 776 endif
 777 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 778 endif
 779 ifdef CONFIG_DEBUG_INFO_DWARF4
 780 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 781 endif
 782
 783 ifdef CONFIG_DEBUG_INFO_REDUCED
 784 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 785                    $(call cc-option,-fno-var-tracking)
 786 endif
 787
 788 ifdef CONFIG_FUNCTION_TRACER
 789 ifndef CC_FLAGS_FTRACE
 790 CC_FLAGS_FTRACE := -pg
 791 endif
 792 export CC_FLAGS_FTRACE
 793 ifdef CONFIG_HAVE_FENTRY
 794 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 795 endif
 796 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 797 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 798 ifdef CONFIG_DYNAMIC_FTRACE
 799         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 800                 BUILD_C_RECORDMCOUNT := y
 801                 export BUILD_C_RECORDMCOUNT
 802         endif
 803 endif
 804 endif
 805
 806 # We trigger additional mismatches with less inlining
 807 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 808 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 809 endif
 810
 811 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 812 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 813 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 814 endif
 815
 816 # arch Makefile may override CC so keep this after arch Makefile is included
 817 NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
 818 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 819
 820 # warn about C99 declaration after statement
 821 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 822
 823 # disable pointer signed / unsigned warnings in gcc 4.0
 824 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 825
 826 # disable invalid "can't wrap" optimizations for signed / pointers
 827 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 828
 829 # clang sets -fmerge-all-constants by default as optimization, but this
 830 # is non-conforming behavior for C and in fact breaks the kernel, so we
 831 # need to disable it here generally.
 832 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 833
 834 # for gcc -fno-merge-all-constants disables everything, but it is fine
 835 # to have actual conforming behavior enabled.
 836 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 837
 838 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 839 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 840
 841 # conserve stack if available
 842 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 843
 844 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 845 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 846
 847 # require functions to have arguments in prototypes, not empty 'int foo()'
 848 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 849
 850 # Prohibit date/time macros, which would make the build non-deterministic
 851 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 852
 853 # enforce correct pointer usage
 854 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 855
 856 # Require designated initializers for all marked structures
 857 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 858
 859 # use the deterministic mode of AR if available
 860 KBUILD_ARFLAGS := $(call ar-option,D)
 861
 862 include scripts/Makefile.kasan
 863 include scripts/Makefile.extrawarn
 864 include scripts/Makefile.ubsan
 865
 866 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 867 # last assignments
 868 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 869 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 870 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 871
 872 # Use --build-id when available.
 873 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 874 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 875 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 876
 877 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 878 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 879 endif
 880
 881 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 882 LDFLAGS_vmlinux += $(call ld-option, -X,)
 883 endif
 884
 885 # Default kernel image to build when no specific target is given.
 886 # KBUILD_IMAGE may be overruled on the command line or
 887 # set in the environment
 888 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 889 # this default value
 890 export KBUILD_IMAGE ?= vmlinux
 891
 892 #
 893 # INSTALL_PATH specifies where to place the updated kernel and system map
 894 # images. Default is /boot, but you can set it to other values
 895 export  INSTALL_PATH ?= /boot
 896
 897 #
 898 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 899 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 900 # an argument if needed. Otherwise it defaults to the kernel install path
 901 #
 902 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 903
 904 #
 905 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 906 # relocations required by build roots.  This is not defined in the
 907 # makefile but the argument can be passed to make if needed.
 908 #
 909
 910 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 911 export MODLIB
 912
 913 #
 914 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 915 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 916 # the default option --strip-debug will be used.  Otherwise,
 917 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 918
 919 ifdef INSTALL_MOD_STRIP
 920 ifeq ($(INSTALL_MOD_STRIP),1)
 921 mod_strip_cmd = $(STRIP) --strip-debug
 922 else
 923 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 924 endif # INSTALL_MOD_STRIP=1
 925 else
 926 mod_strip_cmd = true
 927 endif # INSTALL_MOD_STRIP
 928 export mod_strip_cmd
 929
 930 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 931 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 932 # or CONFIG_MODULE_COMPRESS_XZ.
 933
 934 mod_compress_cmd = true
 935 ifdef CONFIG_MODULE_COMPRESS
 936   ifdef CONFIG_MODULE_COMPRESS_GZIP
 937     mod_compress_cmd = gzip -n -f
 938   endif # CONFIG_MODULE_COMPRESS_GZIP
 939   ifdef CONFIG_MODULE_COMPRESS_XZ
 940     mod_compress_cmd = xz -f
 941   endif # CONFIG_MODULE_COMPRESS_XZ
 942 endif # CONFIG_MODULE_COMPRESS
 943 export mod_compress_cmd
 944
 945 # Select initial ramdisk compression format, default is gzip(1).
 946 # This shall be used by the dracut(8) tool while creating an initramfs image.
 947 #
 948 INITRD_COMPRESS-y                  := gzip
 949 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 950 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 951 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 952 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 953 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 954 # do not export INITRD_COMPRESS, since we didn't actually
 955 # choose a sane default compression above.
 956 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 957
 958 ifdef CONFIG_MODULE_SIG_ALL
 959 $(eval $(call config_filename,MODULE_SIG_KEY))
 960
 961 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 962 else
 963 mod_sign_cmd = true
 964 endif
 965 export mod_sign_cmd
 966
 967 ifdef CONFIG_STACK_VALIDATION
 968   has_libelf := $(call try-run,\
 969                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 970   ifeq ($(has_libelf),1)
 971     objtool_target := tools/objtool FORCE
 972   else
 973     ifdef CONFIG_UNWINDER_ORC
 974       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 975     else
 976       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 977     endif
 978     SKIP_STACK_VALIDATION := 1
 979     export SKIP_STACK_VALIDATION
 980   endif
 981 endif
 982
 983
 984 ifeq ($(KBUILD_EXTMOD),)
 985 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 986
 987 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 988                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 989                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 990
 991 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 992                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 993
 994 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 995 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 996 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 997 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 998 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 999 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
1000 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
1001
1002 # Externally visible symbols (used by link-vmlinux.sh)
1003 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1004 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1005 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1006 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1007 export LDFLAGS_vmlinux
1008 # used by scripts/package/Makefile
1009 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1010
1011 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1012
1013 # Include targets which we want to execute sequentially if the rest of the
1014 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1015 # evaluated more than once.
1016 PHONY += vmlinux_prereq
1017 vmlinux_prereq: $(vmlinux-deps) FORCE
1018 ifdef CONFIG_HEADERS_CHECK
1019         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1020 endif
1021 ifdef CONFIG_GDB_SCRIPTS
1022         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1023 endif
1024 ifdef CONFIG_TRIM_UNUSED_KSYMS
1025         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1026           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1027 endif
1028
1029 # standalone target for easier testing
1030 include/generated/autoksyms.h: FORCE
1031         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1032
1033 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1034
1035 # Final link of vmlinux with optional arch pass after final link
1036 cmd_link-vmlinux =                                                 \
1037         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1038         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1039
1040 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1041         +$(call if_changed,link-vmlinux)
1042
1043 # Build samples along the rest of the kernel
1044 ifdef CONFIG_SAMPLES
1045 vmlinux-dirs += samples
1046 endif
1047
1048 # The actual objects are generated when descending,
1049 # make sure no implicit rule kicks in
1050 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1051
1052 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1053 # Preset locale variables to speed up the build process. Limit locale
1054 # tweaks to this spot to avoid wrong language settings when running
1055 # make menuconfig etc.
1056 # Error messages still appears in the original language
1057
1058 PHONY += $(vmlinux-dirs)
1059 $(vmlinux-dirs): prepare scripts
1060         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1061
1062 define filechk_kernel.release
1063         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1064 endef
1065
1066 # Store (new) KERNELRELEASE string in include/config/kernel.release
1067 include/config/kernel.release: include/config/auto.conf FORCE
1068         $(call filechk,kernel.release)
1069
1070
1071 # Things we need to do before we recursively start building the kernel
1072 # or the modules are listed in "prepare".
1073 # A multi level approach is used. prepareN is processed before prepareN-1.
1074 # archprepare is used in arch Makefiles and when processed asm symlink,
1075 # version.h and scripts_basic is processed / created.
1076
1077 # Listed in dependency order
1078 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1079
1080 # prepare3 is used to check if we are building in a separate output directory,
1081 # and if so do:
1082 # 1) Check that make has not been executed in the kernel src $(srctree)
1083 prepare3: include/config/kernel.release
1084 ifneq ($(KBUILD_SRC),)
1085         @$(kecho) '  Using $(srctree) as source for kernel'
1086         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1087                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1088                 echo >&2 "  in the '$(srctree)' directory.";\
1089                 /bin/false; \
1090         fi;
1091 endif
1092
1093 # prepare2 creates a makefile if using a separate output directory.
1094 # From this point forward, .config has been reprocessed, so any rules
1095 # that need to depend on updated CONFIG_* values can be checked here.
1096 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1097
1098 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1099                    include/config/auto.conf
1100         $(cmd_crmodverdir)
1101
1102 archprepare: archheaders archscripts prepare1 scripts_basic
1103
1104 prepare0: archprepare gcc-plugins
1105         $(Q)$(MAKE) $(build)=.
1106
1107 # All the preparing..
1108 prepare: prepare0 prepare-objtool
1109
1110 # Support for using generic headers in asm-generic
1111 PHONY += asm-generic uapi-asm-generic
1112 asm-generic: uapi-asm-generic
1113         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1114                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1115 uapi-asm-generic:
1116         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1117                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1118
1119 PHONY += prepare-objtool
1120 prepare-objtool: $(objtool_target)
1121
1122 # Check for CONFIG flags that require compiler support. Abort the build
1123 # after .config has been processed, but before the kernel build starts.
1124 #
1125 # For security-sensitive CONFIG options, we don't want to fallback and/or
1126 # silently change which compiler flags will be used, since that leads to
1127 # producing kernels with different security feature characteristics
1128 # depending on the compiler used. (For example, "But I selected
1129 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1130 PHONY += prepare-compiler-check
1131 prepare-compiler-check: FORCE
1132 # Make sure compiler supports requested stack protector flag.
1133 ifdef stackp-name
1134   # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
1135   ifeq ($(stackp-flag),)
1136         @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1137                   Compiler does not support any known stack-protector >&2
1138   else
1139   # Fail if specifically requested stack protector is missing.
1140   ifeq ($(call cc-option, $(stackp-flag)),)
1141         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1142                   $(stackp-flag) not supported by compiler >&2 && exit 1
1143   endif
1144   endif
1145 endif
1146 # Make sure compiler does not have buggy stack-protector support. If a
1147 # specific stack-protector was requested, fail the build, otherwise warn.
1148 ifdef stackp-broken
1149   ifeq ($(stackp-name),AUTO)
1150         @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1151                   $(stackp-flag) available but compiler is broken: disabling >&2
1152   else
1153         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1154                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1155   endif
1156 endif
1157         @:
1158
1159 # Generate some files
1160 # ---------------------------------------------------------------------------
1161
1162 # KERNELRELEASE can change from a few different places, meaning version.h
1163 # needs to be updated, so this check is forced on all builds
1164
1165 uts_len := 64
1166 define filechk_utsrelease.h
1167         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1168           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1169           exit 1;                                                         \
1170         fi;                                                               \
1171         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1172 endef
1173
1174 define filechk_version.h
1175         (echo \#define LINUX_VERSION_CODE $(shell                         \
1176         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1177         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1178 endef
1179
1180 $(version_h): $(srctree)/Makefile FORCE
1181         $(call filechk,version.h)
1182         $(Q)rm -f $(old_version_h)
1183
1184 include/generated/utsrelease.h: include/config/kernel.release FORCE
1185         $(call filechk,utsrelease.h)
1186
1187 PHONY += headerdep
1188 headerdep:
1189         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1190         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1191
1192 # ---------------------------------------------------------------------------
1193 # Kernel headers
1194
1195 #Default location for installed headers
1196 export INSTALL_HDR_PATH = $(objtree)/usr
1197
1198 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1199 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1200
1201 PHONY += archheaders
1202 archheaders:
1203
1204 PHONY += archscripts
1205 archscripts:
1206
1207 PHONY += __headers
1208 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1209         $(Q)$(MAKE) $(build)=scripts build_unifdef
1210
1211 PHONY += headers_install_all
1212 headers_install_all:
1213         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1214
1215 PHONY += headers_install
1216 headers_install: __headers
1217         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1218           $(error Headers not exportable for the $(SRCARCH) architecture))
1219         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1220         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1221
1222 PHONY += headers_check_all
1223 headers_check_all: headers_install_all
1224         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1225
1226 PHONY += headers_check
1227 headers_check: headers_install
1228         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1229         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1230
1231 # ---------------------------------------------------------------------------
1232 # Kernel selftest
1233
1234 PHONY += kselftest
1235 kselftest:
1236         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1237
1238 PHONY += kselftest-clean
1239 kselftest-clean:
1240         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1241
1242 PHONY += kselftest-merge
1243 kselftest-merge:
1244         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1245         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1246                 -m $(objtree)/.config \
1247                 $(srctree)/tools/testing/selftests/*/config
1248         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1249
1250 # ---------------------------------------------------------------------------
1251 # Modules
1252
1253 ifdef CONFIG_MODULES
1254
1255 # By default, build modules as well
1256
1257 all: modules
1258
1259 # Build modules
1260 #
1261 # A module can be listed more than once in obj-m resulting in
1262 # duplicate lines in modules.order files.  Those are removed
1263 # using awk while concatenating to the final file.
1264
1265 PHONY += modules
1266 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1267         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1268         @$(kecho) '  Building modules, stage 2.';
1269         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1270
1271 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1272         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1273
1274 %/modules.builtin: include/config/auto.conf
1275         $(Q)$(MAKE) $(modbuiltin)=$*
1276
1277
1278 # Target to prepare building external modules
1279 PHONY += modules_prepare
1280 modules_prepare: prepare scripts
1281
1282 # Target to install modules
1283 PHONY += modules_install
1284 modules_install: _modinst_ _modinst_post
1285
1286 PHONY += _modinst_
1287 _modinst_:
1288         @rm -rf $(MODLIB)/kernel
1289         @rm -f $(MODLIB)/source
1290         @mkdir -p $(MODLIB)/kernel
1291         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1292         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1293                 rm -f $(MODLIB)/build ; \
1294                 ln -s $(CURDIR) $(MODLIB)/build ; \
1295         fi
1296         @cp -f $(objtree)/modules.order $(MODLIB)/
1297         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1298         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1299
1300 # This depmod is only for convenience to give the initial
1301 # boot a modules.dep even before / is mounted read-write.  However the
1302 # boot script depmod is the master version.
1303 PHONY += _modinst_post
1304 _modinst_post: _modinst_
1305         $(call cmd,depmod)
1306
1307 ifeq ($(CONFIG_MODULE_SIG), y)
1308 PHONY += modules_sign
1309 modules_sign:
1310         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1311 endif
1312
1313 else # CONFIG_MODULES
1314
1315 # Modules not configured
1316 # ---------------------------------------------------------------------------
1317
1318 PHONY += modules modules_install
1319 modules modules_install:
1320         @echo >&2
1321         @echo >&2 "The present kernel configuration has modules disabled."
1322         @echo >&2 "Type 'make config' and enable loadable module support."
1323         @echo >&2 "Then build a kernel with module support enabled."
1324         @echo >&2
1325         @exit 1
1326
1327 endif # CONFIG_MODULES
1328
1329 ###
1330 # Cleaning is done on three levels.
1331 # make clean     Delete most generated files
1332 #                Leave enough to build external modules
1333 # make mrproper  Delete the current configuration, and all generated files
1334 # make distclean Remove editor backup files, patch leftover files and the like
1335
1336 # Directories & files removed with 'make clean'
1337 CLEAN_DIRS  += $(MODVERDIR)
1338
1339 # Directories & files removed with 'make mrproper'
1340 MRPROPER_DIRS  += include/config usr/include include/generated          \
1341                   arch/*/include/generated .tmp_objdiff
1342 MRPROPER_FILES += .config .config.old .version \
1343                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1344                   signing_key.pem signing_key.priv signing_key.x509     \
1345                   x509.genkey extra_certificates signing_key.x509.keyid \
1346                   signing_key.x509.signer vmlinux-gdb.py
1347
1348 # clean - Delete most, but leave enough to build external modules
1349 #
1350 clean: rm-dirs  := $(CLEAN_DIRS)
1351 clean: rm-files := $(CLEAN_FILES)
1352 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1353
1354 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1355 $(clean-dirs):
1356         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1357
1358 vmlinuxclean:
1359         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1360         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1361
1362 clean: archclean vmlinuxclean
1363
1364 # mrproper - Delete all generated files, including .config
1365 #
1366 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1367 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1368 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1369
1370 PHONY += $(mrproper-dirs) mrproper archmrproper
1371 $(mrproper-dirs):
1372         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1373
1374 mrproper: clean archmrproper $(mrproper-dirs)
1375         $(call cmd,rmdirs)
1376         $(call cmd,rmfiles)
1377
1378 # distclean
1379 #
1380 PHONY += distclean
1381
1382 distclean: mrproper
1383         @find $(srctree) $(RCS_FIND_IGNORE) \
1384                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1385                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1386                 -o -name 'core' \) \
1387                 -type f -print | xargs rm -f
1388
1389
1390 # Packaging of the kernel to various formats
1391 # ---------------------------------------------------------------------------
1392 # rpm target kept for backward compatibility
1393 package-dir     := scripts/package
1394
1395 %src-pkg: FORCE
1396         $(Q)$(MAKE) $(build)=$(package-dir) $@
1397 %pkg: include/config/kernel.release FORCE
1398         $(Q)$(MAKE) $(build)=$(package-dir) $@
1399 rpm: rpm-pkg
1400         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1401         @echo "           Please use \"rpm-pkg\" instead."
1402
1403
1404 # Brief documentation of the typical targets used
1405 # ---------------------------------------------------------------------------
1406
1407 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1408 boards := $(sort $(notdir $(boards)))
1409 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1410 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1411
1412 PHONY += help
1413 help:
1414         @echo  'Cleaning targets:'
1415         @echo  '  clean           - Remove most generated files but keep the config and'
1416         @echo  '                    enough build support to build external modules'
1417         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1418         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1419         @echo  ''
1420         @echo  'Configuration targets:'
1421         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1422         @echo  ''
1423         @echo  'Other generic targets:'
1424         @echo  '  all             - Build all targets marked with [*]'
1425         @echo  '* vmlinux         - Build the bare kernel'
1426         @echo  '* modules         - Build all modules'
1427         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1428         @echo  '  dir/            - Build all files in dir and below'
1429         @echo  '  dir/file.[ois]  - Build specified target only'
1430         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1431         @echo  '                    (requires compiler support for LLVM assembly generation)'
1432         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1433         @echo  '                    (requires a recent binutils and recent build (System.map))'
1434         @echo  '  dir/file.ko     - Build module including final link'
1435         @echo  '  modules_prepare - Set up for building external modules'
1436         @echo  '  tags/TAGS       - Generate tags file for editors'
1437         @echo  '  cscope          - Generate cscope index'
1438         @echo  '  gtags           - Generate GNU GLOBAL index'
1439         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1440         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1441         @echo  '  image_name      - Output the image name (use with make -s)'
1442         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1443          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1444          echo  ''
1445         @echo  'Static analysers:'
1446         @echo  '  checkstack      - Generate a list of stack hogs'
1447         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1448         @echo  '  versioncheck    - Sanity check on version.h usage'
1449         @echo  '  includecheck    - Check for duplicate included header files'
1450         @echo  '  export_report   - List the usages of all exported symbols'
1451         @echo  '  headers_check   - Sanity check on exported headers'
1452         @echo  '  headerdep       - Detect inclusion cycles in headers'
1453         @echo  '  coccicheck      - Check with Coccinelle'
1454         @echo  ''
1455         @echo  'Kernel selftest:'
1456         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1457         @echo  '                    Build, install, and boot kernel before'
1458         @echo  '                    running kselftest on it'
1459         @echo  '  kselftest-clean - Remove all generated kselftest files'
1460         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1461         @echo  '                    .config.'
1462         @echo  ''
1463         @echo 'Userspace tools targets:'
1464         @echo '  use "make tools/help"'
1465         @echo '  or  "cd tools; make help"'
1466         @echo  ''
1467         @echo  'Kernel packaging:'
1468         @$(MAKE) $(build)=$(package-dir) help
1469         @echo  ''
1470         @echo  'Documentation targets:'
1471         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1472         @echo  ''
1473         @echo  'Architecture specific targets ($(SRCARCH)):'
1474         @$(if $(archhelp),$(archhelp),\
1475                 echo '  No architecture specific help defined for $(SRCARCH)')
1476         @echo  ''
1477         @$(if $(boards), \
1478                 $(foreach b, $(boards), \
1479                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1480                 echo '')
1481         @$(if $(board-dirs), \
1482                 $(foreach b, $(board-dirs), \
1483                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1484                 printf "  %-16s - Show all of the above\\n" help-boards; \
1485                 echo '')
1486
1487         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1488         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1489         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1490         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1491         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1492         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1493         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1494         @echo  '                1: warnings which may be relevant and do not occur too often'
1495         @echo  '                2: warnings which occur quite often but may still be relevant'
1496         @echo  '                3: more obscure warnings, can most likely be ignored'
1497         @echo  '                Multiple levels can be combined with W=12 or W=123'
1498         @echo  ''
1499         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1500         @echo  'For further info see the ./README file'
1501
1502
1503 help-board-dirs := $(addprefix help-,$(board-dirs))
1504
1505 help-boards: $(help-board-dirs)
1506
1507 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1508
1509 $(help-board-dirs): help-%:
1510         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1511         @$(if $(boards-per-dir), \
1512                 $(foreach b, $(boards-per-dir), \
1513                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1514                 echo '')
1515
1516
1517 # Documentation targets
1518 # ---------------------------------------------------------------------------
1519 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1520                linkcheckdocs dochelp refcheckdocs
1521 PHONY += $(DOC_TARGETS)
1522 $(DOC_TARGETS): scripts_basic FORCE
1523         $(Q)$(MAKE) $(build)=Documentation $@
1524
1525 else # KBUILD_EXTMOD
1526
1527 ###
1528 # External module support.
1529 # When building external modules the kernel used as basis is considered
1530 # read-only, and no consistency checks are made and the make
1531 # system is not used on the basis kernel. If updates are required
1532 # in the basis kernel ordinary make commands (without M=...) must
1533 # be used.
1534 #
1535 # The following are the only valid targets when building external
1536 # modules.
1537 # make M=dir clean     Delete all automatically generated files
1538 # make M=dir modules   Make all modules in specified dir
1539 # make M=dir           Same as 'make M=dir modules'
1540 # make M=dir modules_install
1541 #                      Install the modules built in the module directory
1542 #                      Assumes install directory is already created
1543
1544 # We are always building modules
1545 KBUILD_MODULES := 1
1546 PHONY += crmodverdir
1547 crmodverdir:
1548         $(cmd_crmodverdir)
1549
1550 PHONY += $(objtree)/Module.symvers
1551 $(objtree)/Module.symvers:
1552         @test -e $(objtree)/Module.symvers || ( \
1553         echo; \
1554         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1555         echo "           is missing; modules will have no dependencies and modversions."; \
1556         echo )
1557
1558 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1559 PHONY += $(module-dirs) modules
1560 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1561         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1562
1563 modules: $(module-dirs)
1564         @$(kecho) '  Building modules, stage 2.';
1565         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1566
1567 PHONY += modules_install
1568 modules_install: _emodinst_ _emodinst_post
1569
1570 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1571 PHONY += _emodinst_
1572 _emodinst_:
1573         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1574         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1575
1576 PHONY += _emodinst_post
1577 _emodinst_post: _emodinst_
1578         $(call cmd,depmod)
1579
1580 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1581
1582 PHONY += $(clean-dirs) clean
1583 $(clean-dirs):
1584         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1585
1586 clean:  rm-dirs := $(MODVERDIR)
1587 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1588
1589 PHONY += help
1590 help:
1591         @echo  '  Building external modules.'
1592         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1593         @echo  ''
1594         @echo  '  modules         - default target, build the module(s)'
1595         @echo  '  modules_install - install the module'
1596         @echo  '  clean           - remove generated files in module directory only'
1597         @echo  ''
1598
1599 # Dummies...
1600 PHONY += prepare scripts
1601 prepare: ;
1602 scripts: ;
1603 endif # KBUILD_EXTMOD
1604
1605 clean: $(clean-dirs)
1606         $(call cmd,rmdirs)
1607         $(call cmd,rmfiles)
1608         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1609                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1610                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1611                 -o -name '*.dwo' -o -name '*.lst' \
1612                 -o -name '*.su'  \
1613                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1614                 -o -name '*.symtypes' -o -name 'modules.order' \
1615                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1616                 -o -name .cache.mk \
1617                 -o -name '*.c.[012]*.*' \
1618                 -o -name '*.ll' \
1619                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1620
1621 # Generate tags for editors
1622 # ---------------------------------------------------------------------------
1623 quiet_cmd_tags = GEN     $@
1624       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1625
1626 tags TAGS cscope gtags: FORCE
1627         $(call cmd,tags)
1628
1629 # Scripts to check various things for consistency
1630 # ---------------------------------------------------------------------------
1631
1632 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1633
1634 includecheck:
1635         find $(srctree)/* $(RCS_FIND_IGNORE) \
1636                 -name '*.[hcS]' -type f -print | sort \
1637                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1638
1639 versioncheck:
1640         find $(srctree)/* $(RCS_FIND_IGNORE) \
1641                 -name '*.[hcS]' -type f -print | sort \
1642                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1643
1644 coccicheck:
1645         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1646
1647 namespacecheck:
1648         $(PERL) $(srctree)/scripts/namespace.pl
1649
1650 export_report:
1651         $(PERL) $(srctree)/scripts/export_report.pl
1652
1653 endif #ifeq ($(config-targets),1)
1654 endif #ifeq ($(mixed-targets),1)
1655
1656 PHONY += checkstack kernelrelease kernelversion image_name
1657
1658 # UML needs a little special treatment here.  It wants to use the host
1659 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1660 # else wants $(ARCH), including people doing cross-builds, which means
1661 # that $(SUBARCH) doesn't work here.
1662 ifeq ($(ARCH), um)
1663 CHECKSTACK_ARCH := $(SUBARCH)
1664 else
1665 CHECKSTACK_ARCH := $(ARCH)
1666 endif
1667 checkstack:
1668         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1669         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1670
1671 kernelrelease:
1672         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1673
1674 kernelversion:
1675         @echo $(KERNELVERSION)
1676
1677 image_name:
1678         @echo $(KBUILD_IMAGE)
1679
1680 # Clear a bunch of variables before executing the submake
1681 tools/: FORCE
1682         $(Q)mkdir -p $(objtree)/tools
1683         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1684
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/ $*
1688
1689 # Single targets
1690 # ---------------------------------------------------------------------------
1691 # Single targets are compatible with:
1692 # - build with mixed source and output
1693 # - build with separate output dir 'make O=...'
1694 # - external modules
1695 #
1696 #  target-dir => where to store outputfile
1697 #  build-dir  => directory in kernel source tree to use
1698
1699 ifeq ($(KBUILD_EXTMOD),)
1700         build-dir  = $(patsubst %/,%,$(dir $@))
1701         target-dir = $(dir $@)
1702 else
1703         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1704         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1705         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1706 endif
1707
1708 %.s: %.c prepare scripts FORCE
1709         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1710 %.i: %.c prepare scripts FORCE
1711         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1712 %.o: %.c prepare scripts FORCE
1713         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1714 %.lst: %.c prepare scripts FORCE
1715         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1716 %.s: %.S prepare scripts FORCE
1717         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1718 %.o: %.S prepare scripts FORCE
1719         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1720 %.symtypes: %.c prepare scripts FORCE
1721         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1722 %.ll: %.c prepare scripts FORCE
1723         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1724
1725 # Modules
1726 /: prepare scripts FORCE
1727         $(cmd_crmodverdir)
1728         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1729         $(build)=$(build-dir)
1730 # Make sure the latest headers are built for Documentation
1731 Documentation/ samples/: headers_install
1732 %/: prepare scripts FORCE
1733         $(cmd_crmodverdir)
1734         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1735         $(build)=$(build-dir)
1736 %.ko: prepare scripts FORCE
1737         $(cmd_crmodverdir)
1738         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1739         $(build)=$(build-dir) $(@:.ko=.o)
1740         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1741
1742 # FIXME Should go into a make.lib or something
1743 # ===========================================================================
1744
1745 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1746       cmd_rmdirs = rm -rf $(rm-dirs)
1747
1748 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1749       cmd_rmfiles = rm -f $(rm-files)
1750
1751 # Run depmod only if we have System.map and depmod is executable
1752 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1753       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1754                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1755
1756 # Create temporary dir for module support files
1757 # clean it up only when building all modules
1758 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1759                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1760
1761 # read all saved command lines
1762
1763 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1764
1765 ifneq ($(cmd_files),)
1766   $(cmd_files): ;       # Do not try to update included dependency files
1767   include $(cmd_files)
1768 endif
1769
1770 endif   # skip-makefile
1771
1772 PHONY += FORCE
1773 FORCE:
1774
1775 # Declare the contents of the .PHONY variable as phony.  We keep that
1776 # information in a variable so we can use it in if_changed and friends.
1777 .PHONY: $(PHONY)