Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 19
   4 SUBLEVEL = 146
   5 EXTRAVERSION =
   6 NAME = "People's Front"
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.a targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Use make M=dir to specify directory of external module to build
 180 # Old syntax make ... SUBDIRS=$PWD is still supported
 181 # Setting the environment variable KBUILD_EXTMOD take precedence
 182 ifdef SUBDIRS
 183   KBUILD_EXTMOD ?= $(SUBDIRS)
 184 endif
 185
 186 ifeq ("$(origin M)", "command line")
 187   KBUILD_EXTMOD := $(M)
 188 endif
 189
 190 ifeq ($(KBUILD_SRC),)
 191         # building in the source tree
 192         srctree := .
 193 else
 194         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 195                 # building in a subdirectory of the source tree
 196                 srctree := ..
 197         else
 198                 srctree := $(KBUILD_SRC)
 199         endif
 200 endif
 201
 202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 203
 204 objtree         := .
 205 src             := $(srctree)
 206 obj             := $(objtree)
 207
 208 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 209
 210 export srctree objtree VPATH
 211
 212 # To make sure we do not include .config for any of the *config targets
 213 # catch them early, and hand them over to scripts/kconfig/Makefile
 214 # It is allowed to specify more targets when calling make, including
 215 # mixing *config targets and build targets.
 216 # For example 'make oldconfig all'.
 217 # Detect when mixed targets is specified, and make a second invocation
 218 # of make so .config is not included in this case either (for *config).
 219
 220 version_h := include/generated/uapi/linux/version.h
 221 old_version_h := include/linux/version.h
 222
 223 clean-targets := %clean mrproper cleandocs
 224 no-dot-config-targets := $(clean-targets) \
 225                          cscope gtags TAGS tags help% %docs check% coccicheck \
 226                          $(version_h) headers_% archheaders archscripts \
 227                          %asm-generic kernelversion %src-pkg
 228 no-sync-config-targets := $(no-dot-config-targets) install %install \
 229                            kernelrelease
 230
 231 config-targets  := 0
 232 mixed-targets   := 0
 233 dot-config      := 1
 234 may-sync-config := 1
 235
 236 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 237         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 238                 dot-config := 0
 239         endif
 240 endif
 241
 242 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 243         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 244                 may-sync-config := 0
 245         endif
 246 endif
 247
 248 ifneq ($(KBUILD_EXTMOD),)
 249         may-sync-config := 0
 250 endif
 251
 252 ifeq ($(KBUILD_EXTMOD),)
 253         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 254                 config-targets := 1
 255                 ifneq ($(words $(MAKECMDGOALS)),1)
 256                         mixed-targets := 1
 257                 endif
 258         endif
 259 endif
 260
 261 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 262 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 263         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 264                 mixed-targets := 1
 265         endif
 266 endif
 267
 268 # install and modules_install need also be processed one by one
 269 ifneq ($(filter install,$(MAKECMDGOALS)),)
 270         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 271                 mixed-targets := 1
 272         endif
 273 endif
 274
 275 ifeq ($(mixed-targets),1)
 276 # ===========================================================================
 277 # We're called with mixed targets (*config and build targets).
 278 # Handle them one by one.
 279
 280 PHONY += $(MAKECMDGOALS) __build_one_by_one
 281
 282 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 283         @:
 284
 285 __build_one_by_one:
 286         $(Q)set -e; \
 287         for i in $(MAKECMDGOALS); do \
 288                 $(MAKE) -f $(srctree)/Makefile $$i; \
 289         done
 290
 291 else
 292
 293 # We need some generic definitions (do not try to remake the file).
 294 scripts/Kbuild.include: ;
 295 include scripts/Kbuild.include
 296
 297 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 298 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 299 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 300 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 301
 302 include scripts/subarch.include
 303
 304 # Cross compiling and selecting different set of gcc/bin-utils
 305 # ---------------------------------------------------------------------------
 306 #
 307 # When performing cross compilation for other architectures ARCH shall be set
 308 # to the target architecture. (See arch/* for the possibilities).
 309 # ARCH can be set during invocation of make:
 310 # make ARCH=ia64
 311 # Another way is to have ARCH set in the environment.
 312 # The default ARCH is the host where make is executed.
 313
 314 # CROSS_COMPILE specify the prefix used for all executables used
 315 # during compilation. Only gcc and related bin-utils executables
 316 # are prefixed with $(CROSS_COMPILE).
 317 # CROSS_COMPILE can be set on the command line
 318 # make CROSS_COMPILE=ia64-linux-
 319 # Alternatively CROSS_COMPILE can be set in the environment.
 320 # Default value for CROSS_COMPILE is not to prefix executables
 321 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 322 ARCH            ?= $(SUBARCH)
 323
 324 # Architecture as present in compile.h
 325 UTS_MACHINE     := $(ARCH)
 326 SRCARCH         := $(ARCH)
 327
 328 # Additional ARCH settings for x86
 329 ifeq ($(ARCH),i386)
 330         SRCARCH := x86
 331 endif
 332 ifeq ($(ARCH),x86_64)
 333         SRCARCH := x86
 334 endif
 335
 336 # Additional ARCH settings for sparc
 337 ifeq ($(ARCH),sparc32)
 338        SRCARCH := sparc
 339 endif
 340 ifeq ($(ARCH),sparc64)
 341        SRCARCH := sparc
 342 endif
 343
 344 # Additional ARCH settings for sh
 345 ifeq ($(ARCH),sh64)
 346        SRCARCH := sh
 347 endif
 348
 349 KCONFIG_CONFIG  ?= .config
 350 export KCONFIG_CONFIG
 351
 352 # SHELL used by kbuild
 353 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 354           else if [ -x /bin/bash ]; then echo /bin/bash; \
 355           else echo sh; fi ; fi)
 356
 357 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 358 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 359 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 360
 361 HOSTCC       = gcc
 362 HOSTCXX      = g++
 363 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 364                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 365                 $(HOSTCFLAGS)
 366 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 367 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 368 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 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 PYTHON2         = python2
 389 PYTHON3         = python3
 390 CHECK           = sparse
 391
 392 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 393                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 394 NOSTDINC_FLAGS  =
 395 CFLAGS_MODULE   =
 396 AFLAGS_MODULE   =
 397 LDFLAGS_MODULE  =
 398 CFLAGS_KERNEL   =
 399 AFLAGS_KERNEL   =
 400 LDFLAGS_vmlinux =
 401
 402 # Use USERINCLUDE when you must reference the UAPI directories only.
 403 USERINCLUDE    := \
 404                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 405                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 406                 -I$(srctree)/include/uapi \
 407                 -I$(objtree)/include/generated/uapi \
 408                 -include $(srctree)/include/linux/kconfig.h
 409
 410 # Use LINUXINCLUDE when you must reference the include/ directory.
 411 # Needed to be compatible with the O= option
 412 LINUXINCLUDE    := \
 413                 -I$(srctree)/arch/$(SRCARCH)/include \
 414                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 415                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 416                 -I$(objtree)/include \
 417                 $(USERINCLUDE)
 418
 419 KBUILD_AFLAGS   := -D__ASSEMBLY__
 420 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 421                    -fno-strict-aliasing -fno-common -fshort-wchar \
 422                    -Werror-implicit-function-declaration \
 423                    -Wno-format-security \
 424                    -std=gnu89
 425 KBUILD_CPPFLAGS := -D__KERNEL__
 426 KBUILD_AFLAGS_KERNEL :=
 427 KBUILD_CFLAGS_KERNEL :=
 428 KBUILD_AFLAGS_MODULE  := -DMODULE
 429 KBUILD_CFLAGS_MODULE  := -DMODULE
 430 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 431 KBUILD_LDFLAGS :=
 432 GCC_PLUGINS_CFLAGS :=
 433 CLANG_FLAGS :=
 434
 435 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 436 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 437 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 438 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 439
 440 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 441 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 442 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 443 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 444 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 445 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 446 export KBUILD_ARFLAGS
 447
 448 # When compiling out-of-tree modules, put MODVERDIR in the module
 449 # tree rather than in the kernel tree. The kernel tree might
 450 # even be read-only.
 451 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 452
 453 # Files to ignore in find ... statements
 454
 455 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 456                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 457                           -prune -o
 458 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 459                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 460
 461 # ===========================================================================
 462 # Rules shared between *config targets and build targets
 463
 464 # Basic helpers built in scripts/basic/
 465 PHONY += scripts_basic
 466 scripts_basic:
 467         $(Q)$(MAKE) $(build)=scripts/basic
 468         $(Q)rm -f .tmp_quiet_recordmcount
 469
 470 # To avoid any implicit rule to kick in, define an empty command.
 471 scripts/basic/%: scripts_basic ;
 472
 473 PHONY += outputmakefile
 474 # outputmakefile generates a Makefile in the output directory, if using a
 475 # separate output directory. This allows convenient use of make in the
 476 # output directory.
 477 outputmakefile:
 478 ifneq ($(KBUILD_SRC),)
 479         $(Q)ln -fsn $(srctree) source
 480         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 481             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 482 endif
 483
 484 ifeq ($(cc-name),clang)
 485 ifneq ($(CROSS_COMPILE),)
 486 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 487 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 488 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
 489 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 490 endif
 491 ifneq ($(GCC_TOOLCHAIN),)
 492 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 493 endif
 494 CLANG_FLAGS     += -no-integrated-as
 495 CLANG_FLAGS     += -Werror=unknown-warning-option
 496 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 497 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 498 export CLANG_FLAGS
 499 endif
 500
 501 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 502 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 503 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 504 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 505 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 506 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 507 export RETPOLINE_CFLAGS
 508 export RETPOLINE_VDSO_CFLAGS
 509
 510 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 511 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 512
 513 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 514 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 515 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 516 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 517 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 518
 519 ifeq ($(config-targets),1)
 520 # ===========================================================================
 521 # *config targets only - make sure prerequisites are updated, and descend
 522 # in scripts/kconfig to make the *config target
 523
 524 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 525 # KBUILD_DEFCONFIG may point out an alternative default configuration
 526 # used for 'make defconfig'
 527 include arch/$(SRCARCH)/Makefile
 528 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 529
 530 config: scripts_basic outputmakefile FORCE
 531         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 532
 533 %config: scripts_basic outputmakefile FORCE
 534         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 535
 536 else
 537 # ===========================================================================
 538 # Build targets only - this includes vmlinux, arch specific targets, clean
 539 # targets and others. In general all targets except *config targets.
 540
 541 # If building an external module we do not care about the all: rule
 542 # but instead _all depend on modules
 543 PHONY += all
 544 ifeq ($(KBUILD_EXTMOD),)
 545 _all: all
 546 else
 547 _all: modules
 548 endif
 549
 550 # Decide whether to build built-in, modular, or both.
 551 # Normally, just do built-in.
 552
 553 KBUILD_MODULES :=
 554 KBUILD_BUILTIN := 1
 555
 556 # If we have only "make modules", don't compile built-in objects.
 557 ifeq ($(MAKECMDGOALS),modules)
 558   KBUILD_BUILTIN :=
 559 endif
 560
 561 # If we have "make <whatever> modules", compile modules
 562 # in addition to whatever we do anyway.
 563 # Just "make" or "make all" shall build modules as well
 564
 565 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 566   KBUILD_MODULES := 1
 567 endif
 568
 569 ifeq ($(MAKECMDGOALS),)
 570   KBUILD_MODULES := 1
 571 endif
 572
 573 export KBUILD_MODULES KBUILD_BUILTIN
 574
 575 ifeq ($(KBUILD_EXTMOD),)
 576 # Objects we will link into vmlinux / subdirs we need to visit
 577 init-y          := init/
 578 drivers-y       := drivers/ sound/ firmware/
 579 net-y           := net/
 580 libs-y          := lib/
 581 core-y          := usr/
 582 virt-y          := virt/
 583 endif # KBUILD_EXTMOD
 584
 585 ifeq ($(dot-config),1)
 586 include include/config/auto.conf
 587 endif
 588
 589 # The all: target is the default when no target is given on the
 590 # command line.
 591 # This allow a user to issue only 'make' to build a kernel including modules
 592 # Defaults to vmlinux, but the arch makefile usually adds further targets
 593 all: vmlinux
 594
 595 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 596         $(call cc-option,-fno-tree-loop-im) \
 597         $(call cc-disable-warning,maybe-uninitialized,)
 598 export CFLAGS_GCOV
 599
 600 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 601 ifdef CONFIG_FUNCTION_TRACER
 602   CC_FLAGS_FTRACE := -pg
 603 endif
 604
 605 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 606 # values of the respective KBUILD_* variables
 607 ARCH_CPPFLAGS :=
 608 ARCH_AFLAGS :=
 609 ARCH_CFLAGS :=
 610 include arch/$(SRCARCH)/Makefile
 611
 612 ifeq ($(dot-config),1)
 613 ifeq ($(may-sync-config),1)
 614 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 615 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 616 # because some architectures define CROSS_COMPILE there.
 617 include include/config/auto.conf.cmd
 618
 619 # To avoid any implicit rule to kick in, define an empty command
 620 $(KCONFIG_CONFIG): ;
 621
 622 # The actual configuration files used during the build are stored in
 623 # include/generated/ and include/config/. Update them if .config is newer than
 624 # include/config/auto.conf (which mirrors .config).
 625 #
 626 # This exploits the 'multi-target pattern rule' trick.
 627 # The syncconfig should be executed only once to make all the targets.
 628 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 629         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 630 else
 631 # External modules and some install targets need include/generated/autoconf.h
 632 # and include/config/auto.conf but do not care if they are up-to-date.
 633 # Use auto.conf to trigger the test
 634 PHONY += include/config/auto.conf
 635
 636 include/config/auto.conf:
 637         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 638         echo >&2;                                                       \
 639         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 640         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 641         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 642         echo >&2 ;                                                      \
 643         /bin/false)
 644
 645 endif # may-sync-config
 646 endif # $(dot-config)
 647
 648 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 649 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 650 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 651 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 652 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 653 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 654
 655 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 656 KBUILD_CFLAGS   += -Os
 657 else
 658 KBUILD_CFLAGS   += -O2
 659 endif
 660
 661 # Tell gcc to never replace conditional load with a non-conditional one
 662 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 663 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 664
 665 include scripts/Makefile.kcov
 666 include scripts/Makefile.gcc-plugins
 667
 668 ifdef CONFIG_READABLE_ASM
 669 # Disable optimizations that make assembler listings hard to read.
 670 # reorder blocks reorders the control in the function
 671 # ipa clone creates specialized cloned functions
 672 # partial inlining inlines only parts of functions
 673 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 674                  $(call cc-option,-fno-ipa-cp-clone,) \
 675                  $(call cc-option,-fno-partial-inlining)
 676 endif
 677
 678 ifneq ($(CONFIG_FRAME_WARN),0)
 679 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 680 endif
 681
 682 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 683 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 684 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 685
 686 KBUILD_CFLAGS += $(stackp-flags-y)
 687
 688 ifeq ($(cc-name),clang)
 689 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 690 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 691 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 692 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 693 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 694 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 695 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 696 # See modpost pattern 2
 697 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 698 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 699 else
 700
 701 # These warnings generated too much noise in a regular build.
 702 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 703 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 704 endif
 705
 706 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 707 ifdef CONFIG_FRAME_POINTER
 708 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 709 else
 710 # Some targets (ARM with Thumb2, for example), can't be built with frame
 711 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 712 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 713 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 714 # -fomit-frame-pointer with FUNCTION_TRACER.
 715 ifndef CONFIG_FUNCTION_TRACER
 716 KBUILD_CFLAGS   += -fomit-frame-pointer
 717 endif
 718 endif
 719
 720 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 721
 722 ifdef CONFIG_DEBUG_INFO
 723 ifdef CONFIG_DEBUG_INFO_SPLIT
 724 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 725 else
 726 KBUILD_CFLAGS   += -g
 727 endif
 728 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 729 endif
 730 ifdef CONFIG_DEBUG_INFO_DWARF4
 731 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 732 endif
 733
 734 ifdef CONFIG_DEBUG_INFO_REDUCED
 735 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 736                    $(call cc-option,-fno-var-tracking)
 737 endif
 738
 739 ifdef CONFIG_FUNCTION_TRACER
 740 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 741   # gcc 5 supports generating the mcount tables directly
 742   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 743     CC_FLAGS_FTRACE     += -mrecord-mcount
 744     export CC_USING_RECORD_MCOUNT := 1
 745   endif
 746   ifdef CONFIG_HAVE_NOP_MCOUNT
 747     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 748       CC_FLAGS_FTRACE   += -mnop-mcount
 749       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 750     endif
 751   endif
 752 endif
 753 ifdef CONFIG_HAVE_FENTRY
 754   ifeq ($(call cc-option-yn, -mfentry),y)
 755     CC_FLAGS_FTRACE     += -mfentry
 756     CC_FLAGS_USING      += -DCC_USING_FENTRY
 757   endif
 758 endif
 759 export CC_FLAGS_FTRACE
 760 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 761 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 762 ifdef CONFIG_DYNAMIC_FTRACE
 763         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 764                 BUILD_C_RECORDMCOUNT := y
 765                 export BUILD_C_RECORDMCOUNT
 766         endif
 767 endif
 768 endif
 769
 770 # We trigger additional mismatches with less inlining
 771 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 772 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 773 endif
 774
 775 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 776 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 777 LDFLAGS_vmlinux += --gc-sections
 778 endif
 779
 780 # arch Makefile may override CC so keep this after arch Makefile is included
 781 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 782
 783 # warn about C99 declaration after statement
 784 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 785
 786 # disable pointer signed / unsigned warnings in gcc 4.0
 787 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 788
 789 # disable stringop warnings in gcc 8+
 790 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 791
 792 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 793 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 794 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 795 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 796
 797 # Another good warning that we'll want to enable eventually
 798 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 799
 800 # Enabled with W=2, disabled by default as noisy
 801 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 802
 803 # disable invalid "can't wrap" optimizations for signed / pointers
 804 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 805
 806 # clang sets -fmerge-all-constants by default as optimization, but this
 807 # is non-conforming behavior for C and in fact breaks the kernel, so we
 808 # need to disable it here generally.
 809 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 810
 811 # for gcc -fno-merge-all-constants disables everything, but it is fine
 812 # to have actual conforming behavior enabled.
 813 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 814
 815 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 816 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 817
 818 # conserve stack if available
 819 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 820
 821 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 822 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 823
 824 # require functions to have arguments in prototypes, not empty 'int foo()'
 825 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 826
 827 # Prohibit date/time macros, which would make the build non-deterministic
 828 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 829
 830 # enforce correct pointer usage
 831 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 832
 833 # Require designated initializers for all marked structures
 834 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 835
 836 # change __FILE__ to the relative path from the srctree
 837 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 838
 839 # ensure -fcf-protection is disabled when using retpoline as it is
 840 # incompatible with -mindirect-branch=thunk-extern
 841 ifdef CONFIG_RETPOLINE
 842 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 843 endif
 844
 845 # use the deterministic mode of AR if available
 846 KBUILD_ARFLAGS := $(call ar-option,D)
 847
 848 include scripts/Makefile.kasan
 849 include scripts/Makefile.extrawarn
 850 include scripts/Makefile.ubsan
 851
 852 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 853 # last assignments
 854 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 855 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 856 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 857
 858 # Use --build-id when available.
 859 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 860 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 861 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 862
 863 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 864 LDFLAGS_vmlinux += $(call ld-option, -X,)
 865 endif
 866
 867 # insure the checker run with the right endianness
 868 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 869
 870 # the checker needs the correct machine size
 871 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 872
 873 # Default kernel image to build when no specific target is given.
 874 # KBUILD_IMAGE may be overruled on the command line or
 875 # set in the environment
 876 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 877 # this default value
 878 export KBUILD_IMAGE ?= vmlinux
 879
 880 #
 881 # INSTALL_PATH specifies where to place the updated kernel and system map
 882 # images. Default is /boot, but you can set it to other values
 883 export  INSTALL_PATH ?= /boot
 884
 885 #
 886 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 887 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 888 # an argument if needed. Otherwise it defaults to the kernel install path
 889 #
 890 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 891
 892 #
 893 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 894 # relocations required by build roots.  This is not defined in the
 895 # makefile but the argument can be passed to make if needed.
 896 #
 897
 898 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 899 export MODLIB
 900
 901 #
 902 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 903 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 904 # the default option --strip-debug will be used.  Otherwise,
 905 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 906
 907 ifdef INSTALL_MOD_STRIP
 908 ifeq ($(INSTALL_MOD_STRIP),1)
 909 mod_strip_cmd = $(STRIP) --strip-debug
 910 else
 911 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 912 endif # INSTALL_MOD_STRIP=1
 913 else
 914 mod_strip_cmd = true
 915 endif # INSTALL_MOD_STRIP
 916 export mod_strip_cmd
 917
 918 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 919 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 920 # or CONFIG_MODULE_COMPRESS_XZ.
 921
 922 mod_compress_cmd = true
 923 ifdef CONFIG_MODULE_COMPRESS
 924   ifdef CONFIG_MODULE_COMPRESS_GZIP
 925     mod_compress_cmd = gzip -n -f
 926   endif # CONFIG_MODULE_COMPRESS_GZIP
 927   ifdef CONFIG_MODULE_COMPRESS_XZ
 928     mod_compress_cmd = xz -f
 929   endif # CONFIG_MODULE_COMPRESS_XZ
 930 endif # CONFIG_MODULE_COMPRESS
 931 export mod_compress_cmd
 932
 933 # Select initial ramdisk compression format, default is gzip(1).
 934 # This shall be used by the dracut(8) tool while creating an initramfs image.
 935 #
 936 INITRD_COMPRESS-y                  := gzip
 937 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 938 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 939 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 940 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 941 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 942 # do not export INITRD_COMPRESS, since we didn't actually
 943 # choose a sane default compression above.
 944 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 945
 946 ifdef CONFIG_MODULE_SIG_ALL
 947 $(eval $(call config_filename,MODULE_SIG_KEY))
 948
 949 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 950 else
 951 mod_sign_cmd = true
 952 endif
 953 export mod_sign_cmd
 954
 955 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 956
 957 ifdef CONFIG_STACK_VALIDATION
 958   has_libelf := $(call try-run,\
 959                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 960   ifeq ($(has_libelf),1)
 961     objtool_target := tools/objtool FORCE
 962   else
 963     SKIP_STACK_VALIDATION := 1
 964     export SKIP_STACK_VALIDATION
 965   endif
 966 endif
 967
 968 PHONY += prepare0
 969
 970 ifeq ($(KBUILD_EXTMOD),)
 971 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 972
 973 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 974                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 975                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 976
 977 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 978                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 979
 980 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 981 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 982 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 983 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 984 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 985 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 986 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 987
 988 # Externally visible symbols (used by link-vmlinux.sh)
 989 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 990 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 991 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 992 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 993 export LDFLAGS_vmlinux
 994 # used by scripts/package/Makefile
 995 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 996
 997 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 998
 999 # Recurse until adjust_autoksyms.sh is satisfied
1000 PHONY += autoksyms_recursive
1001 autoksyms_recursive: $(vmlinux-deps)
1002 ifdef CONFIG_TRIM_UNUSED_KSYMS
1003         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1004           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1005 endif
1006
1007 # For the kernel to actually contain only the needed exported symbols,
1008 # we have to build modules as well to determine what those symbols are.
1009 # (this can be evaluated only once include/config/auto.conf has been included)
1010 ifdef CONFIG_TRIM_UNUSED_KSYMS
1011   KBUILD_MODULES := 1
1012 endif
1013
1014 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1015
1016 $(autoksyms_h):
1017         $(Q)mkdir -p $(dir $@)
1018         $(Q)touch $@
1019
1020 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1021
1022 # Final link of vmlinux with optional arch pass after final link
1023 cmd_link-vmlinux =                                                 \
1024         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1025         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1026
1027 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1028 ifdef CONFIG_HEADERS_CHECK
1029         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1030 endif
1031 ifdef CONFIG_GDB_SCRIPTS
1032         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1033 endif
1034         +$(call if_changed,link-vmlinux)
1035
1036 # Build samples along the rest of the kernel. This needs headers_install.
1037 ifdef CONFIG_SAMPLES
1038 vmlinux-dirs += samples
1039 samples: headers_install
1040 endif
1041
1042 # The actual objects are generated when descending,
1043 # make sure no implicit rule kicks in
1044 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1045
1046 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1047 # Preset locale variables to speed up the build process. Limit locale
1048 # tweaks to this spot to avoid wrong language settings when running
1049 # make menuconfig etc.
1050 # Error messages still appears in the original language
1051
1052 PHONY += $(vmlinux-dirs)
1053 $(vmlinux-dirs): prepare scripts
1054         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1055
1056 define filechk_kernel.release
1057         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1058 endef
1059
1060 # Store (new) KERNELRELEASE string in include/config/kernel.release
1061 include/config/kernel.release: $(srctree)/Makefile FORCE
1062         $(call filechk,kernel.release)
1063
1064 # Additional helpers built in scripts/
1065 # Carefully list dependencies so we do not try to build scripts twice
1066 # in parallel
1067 PHONY += scripts
1068 scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h)
1069         $(Q)$(MAKE) $(build)=$(@)
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 PHONY += prepare archprepare prepare1 prepare2 prepare3
1078
1079 # prepare3 is used to check if we are building in a separate output directory,
1080 # and if so do:
1081 # 1) Check that make has not been executed in the kernel src $(srctree)
1082 prepare3: include/config/kernel.release
1083 ifneq ($(KBUILD_SRC),)
1084         @$(kecho) '  Using $(srctree) as source for kernel'
1085         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1086                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1087                 echo >&2 "  in the '$(srctree)' directory.";\
1088                 /bin/false; \
1089         fi;
1090 endif
1091
1092 # prepare2 creates a makefile if using a separate output directory.
1093 # From this point forward, .config has been reprocessed, so any rules
1094 # that need to depend on updated CONFIG_* values can be checked here.
1095 prepare2: prepare3 outputmakefile asm-generic
1096
1097 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1098         $(cmd_crmodverdir)
1099
1100 archprepare: archheaders archscripts prepare1 scripts_basic
1101
1102 prepare0: archprepare gcc-plugins
1103         $(Q)$(MAKE) $(build)=.
1104
1105 # All the preparing..
1106 prepare: prepare0 prepare-objtool
1107
1108 # Support for using generic headers in asm-generic
1109 PHONY += asm-generic uapi-asm-generic
1110 asm-generic: uapi-asm-generic
1111         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1112                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1113 uapi-asm-generic:
1114         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1115                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1116
1117 PHONY += prepare-objtool
1118 prepare-objtool: $(objtool_target)
1119 ifeq ($(SKIP_STACK_VALIDATION),1)
1120 ifdef CONFIG_UNWINDER_ORC
1121         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1122         @false
1123 else
1124         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1125 endif
1126 endif
1127
1128 # Generate some files
1129 # ---------------------------------------------------------------------------
1130
1131 # KERNELRELEASE can change from a few different places, meaning version.h
1132 # needs to be updated, so this check is forced on all builds
1133
1134 uts_len := 64
1135 define filechk_utsrelease.h
1136         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1137           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1138           exit 1;                                                         \
1139         fi;                                                               \
1140         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1141 endef
1142
1143 define filechk_version.h
1144         (echo \#define LINUX_VERSION_CODE $(shell                         \
1145         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1146         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1147 endef
1148
1149 $(version_h): FORCE
1150         $(call filechk,version.h)
1151         $(Q)rm -f $(old_version_h)
1152
1153 include/generated/utsrelease.h: include/config/kernel.release FORCE
1154         $(call filechk,utsrelease.h)
1155
1156 PHONY += headerdep
1157 headerdep:
1158         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1159         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1160
1161 # ---------------------------------------------------------------------------
1162 # Kernel headers
1163
1164 #Default location for installed headers
1165 export INSTALL_HDR_PATH = $(objtree)/usr
1166
1167 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1168 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1169
1170 PHONY += archheaders
1171 archheaders:
1172
1173 PHONY += archscripts
1174 archscripts:
1175
1176 PHONY += __headers
1177 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1178         $(Q)$(MAKE) $(build)=scripts build_unifdef
1179
1180 PHONY += headers_install_all
1181 headers_install_all:
1182         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1183
1184 PHONY += headers_install
1185 headers_install: __headers
1186         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1187           $(error Headers not exportable for the $(SRCARCH) architecture))
1188         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1189         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1190
1191 PHONY += headers_check_all
1192 headers_check_all: headers_install_all
1193         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1194
1195 PHONY += headers_check
1196 headers_check: headers_install
1197         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1198         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1199
1200 # ---------------------------------------------------------------------------
1201 # Kernel selftest
1202
1203 PHONY += kselftest
1204 kselftest:
1205         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1206
1207 PHONY += kselftest-clean
1208 kselftest-clean:
1209         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1210
1211 PHONY += kselftest-merge
1212 kselftest-merge:
1213         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1214         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1215                 -m $(objtree)/.config \
1216                 $(srctree)/tools/testing/selftests/*/config
1217         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1218
1219 # ---------------------------------------------------------------------------
1220 # Modules
1221
1222 ifdef CONFIG_MODULES
1223
1224 # By default, build modules as well
1225
1226 all: modules
1227
1228 # When we're building modules with modversions, we need to consider
1229 # the built-in objects during the descend as well, in order to
1230 # make sure the checksums are up to date before we record them.
1231 ifdef CONFIG_MODVERSIONS
1232   KBUILD_BUILTIN := 1
1233 endif
1234
1235 # Build modules
1236 #
1237 # A module can be listed more than once in obj-m resulting in
1238 # duplicate lines in modules.order files.  Those are removed
1239 # using awk while concatenating to the final file.
1240
1241 PHONY += modules
1242 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1243         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1244         @$(kecho) '  Building modules, stage 2.';
1245         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1246
1247 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1248         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1249
1250 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1251         $(Q)$(MAKE) $(modbuiltin)=$*
1252
1253
1254 # Target to prepare building external modules
1255 PHONY += modules_prepare
1256 modules_prepare: prepare scripts
1257
1258 # Target to install modules
1259 PHONY += modules_install
1260 modules_install: _modinst_ _modinst_post
1261
1262 PHONY += _modinst_
1263 _modinst_:
1264         @rm -rf $(MODLIB)/kernel
1265         @rm -f $(MODLIB)/source
1266         @mkdir -p $(MODLIB)/kernel
1267         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1268         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1269                 rm -f $(MODLIB)/build ; \
1270                 ln -s $(CURDIR) $(MODLIB)/build ; \
1271         fi
1272         @cp -f $(objtree)/modules.order $(MODLIB)/
1273         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1274         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1275
1276 # This depmod is only for convenience to give the initial
1277 # boot a modules.dep even before / is mounted read-write.  However the
1278 # boot script depmod is the master version.
1279 PHONY += _modinst_post
1280 _modinst_post: _modinst_
1281         $(call cmd,depmod)
1282
1283 ifeq ($(CONFIG_MODULE_SIG), y)
1284 PHONY += modules_sign
1285 modules_sign:
1286         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1287 endif
1288
1289 else # CONFIG_MODULES
1290
1291 # Modules not configured
1292 # ---------------------------------------------------------------------------
1293
1294 PHONY += modules modules_install
1295 modules modules_install:
1296         @echo >&2
1297         @echo >&2 "The present kernel configuration has modules disabled."
1298         @echo >&2 "Type 'make config' and enable loadable module support."
1299         @echo >&2 "Then build a kernel with module support enabled."
1300         @echo >&2
1301         @exit 1
1302
1303 endif # CONFIG_MODULES
1304
1305 ###
1306 # Cleaning is done on three levels.
1307 # make clean     Delete most generated files
1308 #                Leave enough to build external modules
1309 # make mrproper  Delete the current configuration, and all generated files
1310 # make distclean Remove editor backup files, patch leftover files and the like
1311
1312 # Directories & files removed with 'make clean'
1313 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1314
1315 # Directories & files removed with 'make mrproper'
1316 MRPROPER_DIRS  += include/config usr/include include/generated          \
1317                   arch/*/include/generated .tmp_objdiff
1318 MRPROPER_FILES += .config .config.old .version \
1319                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1320                   signing_key.pem signing_key.priv signing_key.x509     \
1321                   x509.genkey extra_certificates signing_key.x509.keyid \
1322                   signing_key.x509.signer vmlinux-gdb.py
1323
1324 # clean - Delete most, but leave enough to build external modules
1325 #
1326 clean: rm-dirs  := $(CLEAN_DIRS)
1327 clean: rm-files := $(CLEAN_FILES)
1328 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1329
1330 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1331 $(clean-dirs):
1332         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1333
1334 vmlinuxclean:
1335         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1336         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1337
1338 clean: archclean vmlinuxclean
1339
1340 # mrproper - Delete all generated files, including .config
1341 #
1342 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1343 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1344 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1345
1346 PHONY += $(mrproper-dirs) mrproper archmrproper
1347 $(mrproper-dirs):
1348         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1349
1350 mrproper: clean archmrproper $(mrproper-dirs)
1351         $(call cmd,rmdirs)
1352         $(call cmd,rmfiles)
1353
1354 # distclean
1355 #
1356 PHONY += distclean
1357
1358 distclean: mrproper
1359         @find $(srctree) $(RCS_FIND_IGNORE) \
1360                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1361                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1362                 -o -name 'core' \) \
1363                 -type f -print | xargs rm -f
1364
1365
1366 # Packaging of the kernel to various formats
1367 # ---------------------------------------------------------------------------
1368 package-dir     := scripts/package
1369
1370 %src-pkg: FORCE
1371         $(Q)$(MAKE) $(build)=$(package-dir) $@
1372 %pkg: include/config/kernel.release FORCE
1373         $(Q)$(MAKE) $(build)=$(package-dir) $@
1374
1375
1376 # Brief documentation of the typical targets used
1377 # ---------------------------------------------------------------------------
1378
1379 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1380 boards := $(sort $(notdir $(boards)))
1381 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1382 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1383
1384 PHONY += help
1385 help:
1386         @echo  'Cleaning targets:'
1387         @echo  '  clean           - Remove most generated files but keep the config and'
1388         @echo  '                    enough build support to build external modules'
1389         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1390         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1391         @echo  ''
1392         @echo  'Configuration targets:'
1393         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1394         @echo  ''
1395         @echo  'Other generic targets:'
1396         @echo  '  all             - Build all targets marked with [*]'
1397         @echo  '* vmlinux         - Build the bare kernel'
1398         @echo  '* modules         - Build all modules'
1399         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1400         @echo  '  dir/            - Build all files in dir and below'
1401         @echo  '  dir/file.[ois]  - Build specified target only'
1402         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1403         @echo  '                    (requires compiler support for LLVM assembly generation)'
1404         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1405         @echo  '                    (requires a recent binutils and recent build (System.map))'
1406         @echo  '  dir/file.ko     - Build module including final link'
1407         @echo  '  modules_prepare - Set up for building external modules'
1408         @echo  '  tags/TAGS       - Generate tags file for editors'
1409         @echo  '  cscope          - Generate cscope index'
1410         @echo  '  gtags           - Generate GNU GLOBAL index'
1411         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1412         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1413         @echo  '  image_name      - Output the image name (use with make -s)'
1414         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1415          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1416          echo  ''
1417         @echo  'Static analysers:'
1418         @echo  '  checkstack      - Generate a list of stack hogs'
1419         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1420         @echo  '  versioncheck    - Sanity check on version.h usage'
1421         @echo  '  includecheck    - Check for duplicate included header files'
1422         @echo  '  export_report   - List the usages of all exported symbols'
1423         @echo  '  headers_check   - Sanity check on exported headers'
1424         @echo  '  headerdep       - Detect inclusion cycles in headers'
1425         @echo  '  coccicheck      - Check with Coccinelle'
1426         @echo  ''
1427         @echo  'Kernel selftest:'
1428         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1429         @echo  '                    Build, install, and boot kernel before'
1430         @echo  '                    running kselftest on it'
1431         @echo  '  kselftest-clean - Remove all generated kselftest files'
1432         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1433         @echo  '                    .config.'
1434         @echo  ''
1435         @echo 'Userspace tools targets:'
1436         @echo '  use "make tools/help"'
1437         @echo '  or  "cd tools; make help"'
1438         @echo  ''
1439         @echo  'Kernel packaging:'
1440         @$(MAKE) $(build)=$(package-dir) help
1441         @echo  ''
1442         @echo  'Documentation targets:'
1443         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1444         @echo  ''
1445         @echo  'Architecture specific targets ($(SRCARCH)):'
1446         @$(if $(archhelp),$(archhelp),\
1447                 echo '  No architecture specific help defined for $(SRCARCH)')
1448         @echo  ''
1449         @$(if $(boards), \
1450                 $(foreach b, $(boards), \
1451                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1452                 echo '')
1453         @$(if $(board-dirs), \
1454                 $(foreach b, $(board-dirs), \
1455                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1456                 printf "  %-16s - Show all of the above\\n" help-boards; \
1457                 echo '')
1458
1459         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1460         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1461         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1462         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1463         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1464         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1465         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1466         @echo  '                1: warnings which may be relevant and do not occur too often'
1467         @echo  '                2: warnings which occur quite often but may still be relevant'
1468         @echo  '                3: more obscure warnings, can most likely be ignored'
1469         @echo  '                Multiple levels can be combined with W=12 or W=123'
1470         @echo  ''
1471         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1472         @echo  'For further info see the ./README file'
1473
1474
1475 help-board-dirs := $(addprefix help-,$(board-dirs))
1476
1477 help-boards: $(help-board-dirs)
1478
1479 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1480
1481 $(help-board-dirs): help-%:
1482         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1483         @$(if $(boards-per-dir), \
1484                 $(foreach b, $(boards-per-dir), \
1485                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1486                 echo '')
1487
1488
1489 # Documentation targets
1490 # ---------------------------------------------------------------------------
1491 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1492                linkcheckdocs dochelp refcheckdocs
1493 PHONY += $(DOC_TARGETS)
1494 $(DOC_TARGETS): scripts_basic FORCE
1495         $(Q)$(MAKE) $(build)=Documentation $@
1496
1497 else # KBUILD_EXTMOD
1498
1499 ###
1500 # External module support.
1501 # When building external modules the kernel used as basis is considered
1502 # read-only, and no consistency checks are made and the make
1503 # system is not used on the basis kernel. If updates are required
1504 # in the basis kernel ordinary make commands (without M=...) must
1505 # be used.
1506 #
1507 # The following are the only valid targets when building external
1508 # modules.
1509 # make M=dir clean     Delete all automatically generated files
1510 # make M=dir modules   Make all modules in specified dir
1511 # make M=dir           Same as 'make M=dir modules'
1512 # make M=dir modules_install
1513 #                      Install the modules built in the module directory
1514 #                      Assumes install directory is already created
1515
1516 # We are always building modules
1517 KBUILD_MODULES := 1
1518
1519 PHONY += $(objtree)/Module.symvers
1520 $(objtree)/Module.symvers:
1521         @test -e $(objtree)/Module.symvers || ( \
1522         echo; \
1523         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1524         echo "           is missing; modules will have no dependencies and modversions."; \
1525         echo )
1526
1527 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1528 PHONY += $(module-dirs) modules
1529 $(module-dirs): prepare $(objtree)/Module.symvers
1530         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1531
1532 modules: $(module-dirs)
1533         @$(kecho) '  Building modules, stage 2.';
1534         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1535
1536 PHONY += modules_install
1537 modules_install: _emodinst_ _emodinst_post
1538
1539 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1540 PHONY += _emodinst_
1541 _emodinst_:
1542         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1543         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1544
1545 PHONY += _emodinst_post
1546 _emodinst_post: _emodinst_
1547         $(call cmd,depmod)
1548
1549 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1550
1551 PHONY += $(clean-dirs) clean
1552 $(clean-dirs):
1553         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1554
1555 clean:  rm-dirs := $(MODVERDIR)
1556 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1557
1558 PHONY += help
1559 help:
1560         @echo  '  Building external modules.'
1561         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1562         @echo  ''
1563         @echo  '  modules         - default target, build the module(s)'
1564         @echo  '  modules_install - install the module'
1565         @echo  '  clean           - remove generated files in module directory only'
1566         @echo  ''
1567
1568 # Dummies...
1569 PHONY += prepare scripts
1570 prepare:
1571         $(cmd_crmodverdir)
1572 scripts: ;
1573 endif # KBUILD_EXTMOD
1574
1575 clean: $(clean-dirs)
1576         $(call cmd,rmdirs)
1577         $(call cmd,rmfiles)
1578         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1579                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1580                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1581                 -o -name '*.dwo' -o -name '*.lst' \
1582                 -o -name '*.su'  \
1583                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1584                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1585                 -o -name '*.asn1.[ch]' \
1586                 -o -name '*.symtypes' -o -name 'modules.order' \
1587                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1588                 -o -name '*.c.[012]*.*' \
1589                 -o -name '*.ll' \
1590                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1591
1592 # Generate tags for editors
1593 # ---------------------------------------------------------------------------
1594 quiet_cmd_tags = GEN     $@
1595       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1596
1597 tags TAGS cscope gtags: FORCE
1598         $(call cmd,tags)
1599
1600 # Scripts to check various things for consistency
1601 # ---------------------------------------------------------------------------
1602
1603 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1604
1605 includecheck:
1606         find $(srctree)/* $(RCS_FIND_IGNORE) \
1607                 -name '*.[hcS]' -type f -print | sort \
1608                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1609
1610 versioncheck:
1611         find $(srctree)/* $(RCS_FIND_IGNORE) \
1612                 -name '*.[hcS]' -type f -print | sort \
1613                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1614
1615 coccicheck:
1616         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1617
1618 namespacecheck:
1619         $(PERL) $(srctree)/scripts/namespace.pl
1620
1621 export_report:
1622         $(PERL) $(srctree)/scripts/export_report.pl
1623
1624 endif #ifeq ($(config-targets),1)
1625 endif #ifeq ($(mixed-targets),1)
1626
1627 PHONY += checkstack kernelrelease kernelversion image_name
1628
1629 # UML needs a little special treatment here.  It wants to use the host
1630 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1631 # else wants $(ARCH), including people doing cross-builds, which means
1632 # that $(SUBARCH) doesn't work here.
1633 ifeq ($(ARCH), um)
1634 CHECKSTACK_ARCH := $(SUBARCH)
1635 else
1636 CHECKSTACK_ARCH := $(ARCH)
1637 endif
1638 checkstack:
1639         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1640         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1641
1642 kernelrelease:
1643         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1644
1645 kernelversion:
1646         @echo $(KERNELVERSION)
1647
1648 image_name:
1649         @echo $(KBUILD_IMAGE)
1650
1651 # Clear a bunch of variables before executing the submake
1652 tools/: FORCE
1653         $(Q)mkdir -p $(objtree)/tools
1654         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1655
1656 tools/%: FORCE
1657         $(Q)mkdir -p $(objtree)/tools
1658         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1659
1660 # Single targets
1661 # ---------------------------------------------------------------------------
1662 # Single targets are compatible with:
1663 # - build with mixed source and output
1664 # - build with separate output dir 'make O=...'
1665 # - external modules
1666 #
1667 #  target-dir => where to store outputfile
1668 #  build-dir  => directory in kernel source tree to use
1669
1670 ifeq ($(KBUILD_EXTMOD),)
1671         build-dir  = $(patsubst %/,%,$(dir $@))
1672         target-dir = $(dir $@)
1673 else
1674         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1675         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1676         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1677 endif
1678
1679 %.s: %.c prepare scripts FORCE
1680         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1681 %.i: %.c prepare scripts FORCE
1682         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1683 %.o: %.c prepare scripts FORCE
1684         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1685 %.lst: %.c prepare scripts FORCE
1686         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1687 %.s: %.S prepare scripts FORCE
1688         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1689 %.o: %.S prepare scripts FORCE
1690         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1691 %.symtypes: %.c prepare scripts FORCE
1692         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1693 %.ll: %.c prepare scripts FORCE
1694         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1695
1696 # Modules
1697 /: prepare scripts FORCE
1698         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1699         $(build)=$(build-dir)
1700 # Make sure the latest headers are built for Documentation
1701 Documentation/ samples/: headers_install
1702 %/: prepare scripts FORCE
1703         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1704         $(build)=$(build-dir)
1705 %.ko: prepare scripts FORCE
1706         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1707         $(build)=$(build-dir) $(@:.ko=.o)
1708         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1709
1710 # FIXME Should go into a make.lib or something
1711 # ===========================================================================
1712
1713 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1714       cmd_rmdirs = rm -rf $(rm-dirs)
1715
1716 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1717       cmd_rmfiles = rm -f $(rm-files)
1718
1719 # Run depmod only if we have System.map and depmod is executable
1720 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1721       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1722                    $(KERNELRELEASE)
1723
1724 # Create temporary dir for module support files
1725 # clean it up only when building all modules
1726 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1727                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1728
1729 # read all saved command lines
1730
1731 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1732
1733 ifneq ($(cmd_files),)
1734   $(cmd_files): ;       # Do not try to update included dependency files
1735   include $(cmd_files)
1736 endif
1737
1738 endif   # skip-makefile
1739
1740 PHONY += FORCE
1741 FORCE:
1742
1743 # Declare the contents of the PHONY variable as phony.  We keep that
1744 # information in a variable so we can use it in if_changed and friends.
1745 .PHONY: $(PHONY)