Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 19
   4 SUBLEVEL = 90
   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)
 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 # When we're building modules with modversions, we need to consider
 558 # the built-in objects during the descend as well, in order to
 559 # make sure the checksums are up to date before we record them.
 560
 561 ifeq ($(MAKECMDGOALS),modules)
 562   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 563 endif
 564
 565 # If we have "make <whatever> modules", compile modules
 566 # in addition to whatever we do anyway.
 567 # Just "make" or "make all" shall build modules as well
 568
 569 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 570   KBUILD_MODULES := 1
 571 endif
 572
 573 ifeq ($(MAKECMDGOALS),)
 574   KBUILD_MODULES := 1
 575 endif
 576
 577 export KBUILD_MODULES KBUILD_BUILTIN
 578
 579 ifeq ($(KBUILD_EXTMOD),)
 580 # Objects we will link into vmlinux / subdirs we need to visit
 581 init-y          := init/
 582 drivers-y       := drivers/ sound/ firmware/
 583 net-y           := net/
 584 libs-y          := lib/
 585 core-y          := usr/
 586 virt-y          := virt/
 587 endif # KBUILD_EXTMOD
 588
 589 ifeq ($(dot-config),1)
 590 include include/config/auto.conf
 591 endif
 592
 593 # The all: target is the default when no target is given on the
 594 # command line.
 595 # This allow a user to issue only 'make' to build a kernel including modules
 596 # Defaults to vmlinux, but the arch makefile usually adds further targets
 597 all: vmlinux
 598
 599 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 600         $(call cc-option,-fno-tree-loop-im) \
 601         $(call cc-disable-warning,maybe-uninitialized,)
 602 export CFLAGS_GCOV
 603
 604 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 605 ifdef CONFIG_FUNCTION_TRACER
 606   CC_FLAGS_FTRACE := -pg
 607 endif
 608
 609 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 610 # values of the respective KBUILD_* variables
 611 ARCH_CPPFLAGS :=
 612 ARCH_AFLAGS :=
 613 ARCH_CFLAGS :=
 614 include arch/$(SRCARCH)/Makefile
 615
 616 ifeq ($(dot-config),1)
 617 ifeq ($(may-sync-config),1)
 618 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 619 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 620 # because some architectures define CROSS_COMPILE there.
 621 include include/config/auto.conf.cmd
 622
 623 # To avoid any implicit rule to kick in, define an empty command
 624 $(KCONFIG_CONFIG): ;
 625
 626 # The actual configuration files used during the build are stored in
 627 # include/generated/ and include/config/. Update them if .config is newer than
 628 # include/config/auto.conf (which mirrors .config).
 629 #
 630 # This exploits the 'multi-target pattern rule' trick.
 631 # The syncconfig should be executed only once to make all the targets.
 632 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 633         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 634 else
 635 # External modules and some install targets need include/generated/autoconf.h
 636 # and include/config/auto.conf but do not care if they are up-to-date.
 637 # Use auto.conf to trigger the test
 638 PHONY += include/config/auto.conf
 639
 640 include/config/auto.conf:
 641         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 642         echo >&2;                                                       \
 643         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 644         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 645         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 646         echo >&2 ;                                                      \
 647         /bin/false)
 648
 649 endif # may-sync-config
 650 endif # $(dot-config)
 651
 652 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 653 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 654 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 655 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 656 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 657 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 658
 659 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 660 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 661 else
 662 ifdef CONFIG_PROFILE_ALL_BRANCHES
 663 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 664 else
 665 KBUILD_CFLAGS   += -O2
 666 endif
 667 endif
 668
 669 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 670                         $(call cc-disable-warning,maybe-uninitialized,))
 671
 672 # Tell gcc to never replace conditional load with a non-conditional one
 673 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 674
 675 include scripts/Makefile.kcov
 676 include scripts/Makefile.gcc-plugins
 677
 678 ifdef CONFIG_READABLE_ASM
 679 # Disable optimizations that make assembler listings hard to read.
 680 # reorder blocks reorders the control in the function
 681 # ipa clone creates specialized cloned functions
 682 # partial inlining inlines only parts of functions
 683 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 684                  $(call cc-option,-fno-ipa-cp-clone,) \
 685                  $(call cc-option,-fno-partial-inlining)
 686 endif
 687
 688 ifneq ($(CONFIG_FRAME_WARN),0)
 689 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 690 endif
 691
 692 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 693 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 694 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 695
 696 KBUILD_CFLAGS += $(stackp-flags-y)
 697
 698 ifeq ($(cc-name),clang)
 699 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 700 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 701 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 702 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 703 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 704 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 705 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 706 # See modpost pattern 2
 707 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 708 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 709 else
 710
 711 # These warnings generated too much noise in a regular build.
 712 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 713 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 714 endif
 715
 716 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 717 ifdef CONFIG_FRAME_POINTER
 718 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 719 else
 720 # Some targets (ARM with Thumb2, for example), can't be built with frame
 721 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 722 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 723 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 724 # -fomit-frame-pointer with FUNCTION_TRACER.
 725 ifndef CONFIG_FUNCTION_TRACER
 726 KBUILD_CFLAGS   += -fomit-frame-pointer
 727 endif
 728 endif
 729
 730 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 731
 732 ifdef CONFIG_DEBUG_INFO
 733 ifdef CONFIG_DEBUG_INFO_SPLIT
 734 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 735 else
 736 KBUILD_CFLAGS   += -g
 737 endif
 738 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 739 endif
 740 ifdef CONFIG_DEBUG_INFO_DWARF4
 741 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 742 endif
 743
 744 ifdef CONFIG_DEBUG_INFO_REDUCED
 745 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 746                    $(call cc-option,-fno-var-tracking)
 747 endif
 748
 749 ifdef CONFIG_FUNCTION_TRACER
 750 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 751   # gcc 5 supports generating the mcount tables directly
 752   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 753     CC_FLAGS_FTRACE     += -mrecord-mcount
 754     export CC_USING_RECORD_MCOUNT := 1
 755   endif
 756   ifdef CONFIG_HAVE_NOP_MCOUNT
 757     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 758       CC_FLAGS_FTRACE   += -mnop-mcount
 759       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 760     endif
 761   endif
 762 endif
 763 ifdef CONFIG_HAVE_FENTRY
 764   ifeq ($(call cc-option-yn, -mfentry),y)
 765     CC_FLAGS_FTRACE     += -mfentry
 766     CC_FLAGS_USING      += -DCC_USING_FENTRY
 767   endif
 768 endif
 769 export CC_FLAGS_FTRACE
 770 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 771 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 772 ifdef CONFIG_DYNAMIC_FTRACE
 773         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 774                 BUILD_C_RECORDMCOUNT := y
 775                 export BUILD_C_RECORDMCOUNT
 776         endif
 777 endif
 778 endif
 779
 780 # We trigger additional mismatches with less inlining
 781 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 782 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 783 endif
 784
 785 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 786 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 787 LDFLAGS_vmlinux += --gc-sections
 788 endif
 789
 790 # arch Makefile may override CC so keep this after arch Makefile is included
 791 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 792
 793 # warn about C99 declaration after statement
 794 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 795
 796 # disable pointer signed / unsigned warnings in gcc 4.0
 797 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 798
 799 # disable stringop warnings in gcc 8+
 800 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 801
 802 # disable invalid "can't wrap" optimizations for signed / pointers
 803 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 804
 805 # clang sets -fmerge-all-constants by default as optimization, but this
 806 # is non-conforming behavior for C and in fact breaks the kernel, so we
 807 # need to disable it here generally.
 808 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 809
 810 # for gcc -fno-merge-all-constants disables everything, but it is fine
 811 # to have actual conforming behavior enabled.
 812 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 813
 814 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 815 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 816
 817 # conserve stack if available
 818 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 819
 820 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 821 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 822
 823 # require functions to have arguments in prototypes, not empty 'int foo()'
 824 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 825
 826 # Prohibit date/time macros, which would make the build non-deterministic
 827 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 828
 829 # enforce correct pointer usage
 830 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 831
 832 # Require designated initializers for all marked structures
 833 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 834
 835 # change __FILE__ to the relative path from the srctree
 836 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 837
 838 # ensure -fcf-protection is disabled when using retpoline as it is
 839 # incompatible with -mindirect-branch=thunk-extern
 840 ifdef CONFIG_RETPOLINE
 841 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 842 endif
 843
 844 # use the deterministic mode of AR if available
 845 KBUILD_ARFLAGS := $(call ar-option,D)
 846
 847 include scripts/Makefile.kasan
 848 include scripts/Makefile.extrawarn
 849 include scripts/Makefile.ubsan
 850
 851 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 852 # last assignments
 853 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 854 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 855 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 856
 857 # Use --build-id when available.
 858 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 859 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 860 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 861
 862 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 863 LDFLAGS_vmlinux += $(call ld-option, -X,)
 864 endif
 865
 866 # insure the checker run with the right endianness
 867 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 868
 869 # the checker needs the correct machine size
 870 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 871
 872 # Default kernel image to build when no specific target is given.
 873 # KBUILD_IMAGE may be overruled on the command line or
 874 # set in the environment
 875 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 876 # this default value
 877 export KBUILD_IMAGE ?= vmlinux
 878
 879 #
 880 # INSTALL_PATH specifies where to place the updated kernel and system map
 881 # images. Default is /boot, but you can set it to other values
 882 export  INSTALL_PATH ?= /boot
 883
 884 #
 885 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 886 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 887 # an argument if needed. Otherwise it defaults to the kernel install path
 888 #
 889 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 890
 891 #
 892 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 893 # relocations required by build roots.  This is not defined in the
 894 # makefile but the argument can be passed to make if needed.
 895 #
 896
 897 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 898 export MODLIB
 899
 900 #
 901 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 902 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 903 # the default option --strip-debug will be used.  Otherwise,
 904 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 905
 906 ifdef INSTALL_MOD_STRIP
 907 ifeq ($(INSTALL_MOD_STRIP),1)
 908 mod_strip_cmd = $(STRIP) --strip-debug
 909 else
 910 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 911 endif # INSTALL_MOD_STRIP=1
 912 else
 913 mod_strip_cmd = true
 914 endif # INSTALL_MOD_STRIP
 915 export mod_strip_cmd
 916
 917 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 918 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 919 # or CONFIG_MODULE_COMPRESS_XZ.
 920
 921 mod_compress_cmd = true
 922 ifdef CONFIG_MODULE_COMPRESS
 923   ifdef CONFIG_MODULE_COMPRESS_GZIP
 924     mod_compress_cmd = gzip -n -f
 925   endif # CONFIG_MODULE_COMPRESS_GZIP
 926   ifdef CONFIG_MODULE_COMPRESS_XZ
 927     mod_compress_cmd = xz -f
 928   endif # CONFIG_MODULE_COMPRESS_XZ
 929 endif # CONFIG_MODULE_COMPRESS
 930 export mod_compress_cmd
 931
 932 # Select initial ramdisk compression format, default is gzip(1).
 933 # This shall be used by the dracut(8) tool while creating an initramfs image.
 934 #
 935 INITRD_COMPRESS-y                  := gzip
 936 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 937 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 938 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 939 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 940 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 941 # do not export INITRD_COMPRESS, since we didn't actually
 942 # choose a sane default compression above.
 943 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 944
 945 ifdef CONFIG_MODULE_SIG_ALL
 946 $(eval $(call config_filename,MODULE_SIG_KEY))
 947
 948 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 949 else
 950 mod_sign_cmd = true
 951 endif
 952 export mod_sign_cmd
 953
 954 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 955
 956 ifdef CONFIG_STACK_VALIDATION
 957   has_libelf := $(call try-run,\
 958                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 959   ifeq ($(has_libelf),1)
 960     objtool_target := tools/objtool FORCE
 961   else
 962     SKIP_STACK_VALIDATION := 1
 963     export SKIP_STACK_VALIDATION
 964   endif
 965 endif
 966
 967
 968 ifeq ($(KBUILD_EXTMOD),)
 969 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 970
 971 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 972                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 973                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 974
 975 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 976                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 977
 978 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 979 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 980 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 981 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 982 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 983 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 984 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 985
 986 # Externally visible symbols (used by link-vmlinux.sh)
 987 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 988 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 989 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 990 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 991 export LDFLAGS_vmlinux
 992 # used by scripts/package/Makefile
 993 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 994
 995 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 996
 997 # Recurse until adjust_autoksyms.sh is satisfied
 998 PHONY += autoksyms_recursive
 999 autoksyms_recursive: $(vmlinux-deps)
1000 ifdef CONFIG_TRIM_UNUSED_KSYMS
1001         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1002           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1003 endif
1004
1005 # For the kernel to actually contain only the needed exported symbols,
1006 # we have to build modules as well to determine what those symbols are.
1007 # (this can be evaluated only once include/config/auto.conf has been included)
1008 ifdef CONFIG_TRIM_UNUSED_KSYMS
1009   KBUILD_MODULES := 1
1010 endif
1011
1012 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1013
1014 $(autoksyms_h):
1015         $(Q)mkdir -p $(dir $@)
1016         $(Q)touch $@
1017
1018 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1019
1020 # Final link of vmlinux with optional arch pass after final link
1021 cmd_link-vmlinux =                                                 \
1022         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1023         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1024
1025 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1026 ifdef CONFIG_HEADERS_CHECK
1027         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1028 endif
1029 ifdef CONFIG_GDB_SCRIPTS
1030         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1031 endif
1032         +$(call if_changed,link-vmlinux)
1033
1034 # Build samples along the rest of the kernel. This needs headers_install.
1035 ifdef CONFIG_SAMPLES
1036 vmlinux-dirs += samples
1037 samples: headers_install
1038 endif
1039
1040 # The actual objects are generated when descending,
1041 # make sure no implicit rule kicks in
1042 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1043
1044 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1045 # Preset locale variables to speed up the build process. Limit locale
1046 # tweaks to this spot to avoid wrong language settings when running
1047 # make menuconfig etc.
1048 # Error messages still appears in the original language
1049
1050 PHONY += $(vmlinux-dirs)
1051 $(vmlinux-dirs): prepare scripts
1052         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1053
1054 define filechk_kernel.release
1055         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1056 endef
1057
1058 # Store (new) KERNELRELEASE string in include/config/kernel.release
1059 include/config/kernel.release: $(srctree)/Makefile FORCE
1060         $(call filechk,kernel.release)
1061
1062 # Additional helpers built in scripts/
1063 # Carefully list dependencies so we do not try to build scripts twice
1064 # in parallel
1065 PHONY += scripts
1066 scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h)
1067         $(Q)$(MAKE) $(build)=$(@)
1068
1069 # Things we need to do before we recursively start building the kernel
1070 # or the modules are listed in "prepare".
1071 # A multi level approach is used. prepareN is processed before prepareN-1.
1072 # archprepare is used in arch Makefiles and when processed asm symlink,
1073 # version.h and scripts_basic is processed / created.
1074
1075 # Listed in dependency order
1076 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1077
1078 # prepare3 is used to check if we are building in a separate output directory,
1079 # and if so do:
1080 # 1) Check that make has not been executed in the kernel src $(srctree)
1081 prepare3: include/config/kernel.release
1082 ifneq ($(KBUILD_SRC),)
1083         @$(kecho) '  Using $(srctree) as source for kernel'
1084         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1085                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1086                 echo >&2 "  in the '$(srctree)' directory.";\
1087                 /bin/false; \
1088         fi;
1089 endif
1090
1091 # prepare2 creates a makefile if using a separate output directory.
1092 # From this point forward, .config has been reprocessed, so any rules
1093 # that need to depend on updated CONFIG_* values can be checked here.
1094 prepare2: prepare3 outputmakefile asm-generic
1095
1096 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1097         $(cmd_crmodverdir)
1098
1099 archprepare: archheaders archscripts prepare1 scripts_basic
1100
1101 prepare0: archprepare gcc-plugins
1102         $(Q)$(MAKE) $(build)=.
1103
1104 # All the preparing..
1105 prepare: prepare0 prepare-objtool
1106
1107 # Support for using generic headers in asm-generic
1108 PHONY += asm-generic uapi-asm-generic
1109 asm-generic: uapi-asm-generic
1110         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1111                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1112 uapi-asm-generic:
1113         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1114                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1115
1116 PHONY += prepare-objtool
1117 prepare-objtool: $(objtool_target)
1118 ifeq ($(SKIP_STACK_VALIDATION),1)
1119 ifdef CONFIG_UNWINDER_ORC
1120         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1121         @false
1122 else
1123         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1124 endif
1125 endif
1126
1127 # Generate some files
1128 # ---------------------------------------------------------------------------
1129
1130 # KERNELRELEASE can change from a few different places, meaning version.h
1131 # needs to be updated, so this check is forced on all builds
1132
1133 uts_len := 64
1134 define filechk_utsrelease.h
1135         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1136           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1137           exit 1;                                                         \
1138         fi;                                                               \
1139         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1140 endef
1141
1142 define filechk_version.h
1143         (echo \#define LINUX_VERSION_CODE $(shell                         \
1144         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1145         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1146 endef
1147
1148 $(version_h): FORCE
1149         $(call filechk,version.h)
1150         $(Q)rm -f $(old_version_h)
1151
1152 include/generated/utsrelease.h: include/config/kernel.release FORCE
1153         $(call filechk,utsrelease.h)
1154
1155 PHONY += headerdep
1156 headerdep:
1157         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1158         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1159
1160 # ---------------------------------------------------------------------------
1161 # Kernel headers
1162
1163 #Default location for installed headers
1164 export INSTALL_HDR_PATH = $(objtree)/usr
1165
1166 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1167 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1168
1169 PHONY += archheaders
1170 archheaders:
1171
1172 PHONY += archscripts
1173 archscripts:
1174
1175 PHONY += __headers
1176 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1177         $(Q)$(MAKE) $(build)=scripts build_unifdef
1178
1179 PHONY += headers_install_all
1180 headers_install_all:
1181         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1182
1183 PHONY += headers_install
1184 headers_install: __headers
1185         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1186           $(error Headers not exportable for the $(SRCARCH) architecture))
1187         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1188         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1189
1190 PHONY += headers_check_all
1191 headers_check_all: headers_install_all
1192         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1193
1194 PHONY += headers_check
1195 headers_check: headers_install
1196         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1197         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1198
1199 # ---------------------------------------------------------------------------
1200 # Kernel selftest
1201
1202 PHONY += kselftest
1203 kselftest:
1204         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1205
1206 PHONY += kselftest-clean
1207 kselftest-clean:
1208         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1209
1210 PHONY += kselftest-merge
1211 kselftest-merge:
1212         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1213         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1214                 -m $(objtree)/.config \
1215                 $(srctree)/tools/testing/selftests/*/config
1216         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1217
1218 # ---------------------------------------------------------------------------
1219 # Modules
1220
1221 ifdef CONFIG_MODULES
1222
1223 # By default, build modules as well
1224
1225 all: modules
1226
1227 # Build modules
1228 #
1229 # A module can be listed more than once in obj-m resulting in
1230 # duplicate lines in modules.order files.  Those are removed
1231 # using awk while concatenating to the final file.
1232
1233 PHONY += modules
1234 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1235         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1236         @$(kecho) '  Building modules, stage 2.';
1237         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1238
1239 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1240         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1241
1242 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1243         $(Q)$(MAKE) $(modbuiltin)=$*
1244
1245
1246 # Target to prepare building external modules
1247 PHONY += modules_prepare
1248 modules_prepare: prepare scripts
1249
1250 # Target to install modules
1251 PHONY += modules_install
1252 modules_install: _modinst_ _modinst_post
1253
1254 PHONY += _modinst_
1255 _modinst_:
1256         @rm -rf $(MODLIB)/kernel
1257         @rm -f $(MODLIB)/source
1258         @mkdir -p $(MODLIB)/kernel
1259         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1260         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1261                 rm -f $(MODLIB)/build ; \
1262                 ln -s $(CURDIR) $(MODLIB)/build ; \
1263         fi
1264         @cp -f $(objtree)/modules.order $(MODLIB)/
1265         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1266         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1267
1268 # This depmod is only for convenience to give the initial
1269 # boot a modules.dep even before / is mounted read-write.  However the
1270 # boot script depmod is the master version.
1271 PHONY += _modinst_post
1272 _modinst_post: _modinst_
1273         $(call cmd,depmod)
1274
1275 ifeq ($(CONFIG_MODULE_SIG), y)
1276 PHONY += modules_sign
1277 modules_sign:
1278         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1279 endif
1280
1281 else # CONFIG_MODULES
1282
1283 # Modules not configured
1284 # ---------------------------------------------------------------------------
1285
1286 PHONY += modules modules_install
1287 modules modules_install:
1288         @echo >&2
1289         @echo >&2 "The present kernel configuration has modules disabled."
1290         @echo >&2 "Type 'make config' and enable loadable module support."
1291         @echo >&2 "Then build a kernel with module support enabled."
1292         @echo >&2
1293         @exit 1
1294
1295 endif # CONFIG_MODULES
1296
1297 ###
1298 # Cleaning is done on three levels.
1299 # make clean     Delete most generated files
1300 #                Leave enough to build external modules
1301 # make mrproper  Delete the current configuration, and all generated files
1302 # make distclean Remove editor backup files, patch leftover files and the like
1303
1304 # Directories & files removed with 'make clean'
1305 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1306
1307 # Directories & files removed with 'make mrproper'
1308 MRPROPER_DIRS  += include/config usr/include include/generated          \
1309                   arch/*/include/generated .tmp_objdiff
1310 MRPROPER_FILES += .config .config.old .version \
1311                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1312                   signing_key.pem signing_key.priv signing_key.x509     \
1313                   x509.genkey extra_certificates signing_key.x509.keyid \
1314                   signing_key.x509.signer vmlinux-gdb.py
1315
1316 # clean - Delete most, but leave enough to build external modules
1317 #
1318 clean: rm-dirs  := $(CLEAN_DIRS)
1319 clean: rm-files := $(CLEAN_FILES)
1320 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1321
1322 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1323 $(clean-dirs):
1324         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1325
1326 vmlinuxclean:
1327         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1328         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1329
1330 clean: archclean vmlinuxclean
1331
1332 # mrproper - Delete all generated files, including .config
1333 #
1334 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1335 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1336 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1337
1338 PHONY += $(mrproper-dirs) mrproper archmrproper
1339 $(mrproper-dirs):
1340         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1341
1342 mrproper: clean archmrproper $(mrproper-dirs)
1343         $(call cmd,rmdirs)
1344         $(call cmd,rmfiles)
1345
1346 # distclean
1347 #
1348 PHONY += distclean
1349
1350 distclean: mrproper
1351         @find $(srctree) $(RCS_FIND_IGNORE) \
1352                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1353                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1354                 -o -name 'core' \) \
1355                 -type f -print | xargs rm -f
1356
1357
1358 # Packaging of the kernel to various formats
1359 # ---------------------------------------------------------------------------
1360 package-dir     := scripts/package
1361
1362 %src-pkg: FORCE
1363         $(Q)$(MAKE) $(build)=$(package-dir) $@
1364 %pkg: include/config/kernel.release FORCE
1365         $(Q)$(MAKE) $(build)=$(package-dir) $@
1366
1367
1368 # Brief documentation of the typical targets used
1369 # ---------------------------------------------------------------------------
1370
1371 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1372 boards := $(sort $(notdir $(boards)))
1373 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1374 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1375
1376 PHONY += help
1377 help:
1378         @echo  'Cleaning targets:'
1379         @echo  '  clean           - Remove most generated files but keep the config and'
1380         @echo  '                    enough build support to build external modules'
1381         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1382         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1383         @echo  ''
1384         @echo  'Configuration targets:'
1385         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1386         @echo  ''
1387         @echo  'Other generic targets:'
1388         @echo  '  all             - Build all targets marked with [*]'
1389         @echo  '* vmlinux         - Build the bare kernel'
1390         @echo  '* modules         - Build all modules'
1391         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1392         @echo  '  dir/            - Build all files in dir and below'
1393         @echo  '  dir/file.[ois]  - Build specified target only'
1394         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1395         @echo  '                    (requires compiler support for LLVM assembly generation)'
1396         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1397         @echo  '                    (requires a recent binutils and recent build (System.map))'
1398         @echo  '  dir/file.ko     - Build module including final link'
1399         @echo  '  modules_prepare - Set up for building external modules'
1400         @echo  '  tags/TAGS       - Generate tags file for editors'
1401         @echo  '  cscope          - Generate cscope index'
1402         @echo  '  gtags           - Generate GNU GLOBAL index'
1403         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1404         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1405         @echo  '  image_name      - Output the image name (use with make -s)'
1406         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1407          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1408          echo  ''
1409         @echo  'Static analysers:'
1410         @echo  '  checkstack      - Generate a list of stack hogs'
1411         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1412         @echo  '  versioncheck    - Sanity check on version.h usage'
1413         @echo  '  includecheck    - Check for duplicate included header files'
1414         @echo  '  export_report   - List the usages of all exported symbols'
1415         @echo  '  headers_check   - Sanity check on exported headers'
1416         @echo  '  headerdep       - Detect inclusion cycles in headers'
1417         @echo  '  coccicheck      - Check with Coccinelle'
1418         @echo  ''
1419         @echo  'Kernel selftest:'
1420         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1421         @echo  '                    Build, install, and boot kernel before'
1422         @echo  '                    running kselftest on it'
1423         @echo  '  kselftest-clean - Remove all generated kselftest files'
1424         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1425         @echo  '                    .config.'
1426         @echo  ''
1427         @echo 'Userspace tools targets:'
1428         @echo '  use "make tools/help"'
1429         @echo '  or  "cd tools; make help"'
1430         @echo  ''
1431         @echo  'Kernel packaging:'
1432         @$(MAKE) $(build)=$(package-dir) help
1433         @echo  ''
1434         @echo  'Documentation targets:'
1435         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1436         @echo  ''
1437         @echo  'Architecture specific targets ($(SRCARCH)):'
1438         @$(if $(archhelp),$(archhelp),\
1439                 echo '  No architecture specific help defined for $(SRCARCH)')
1440         @echo  ''
1441         @$(if $(boards), \
1442                 $(foreach b, $(boards), \
1443                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1444                 echo '')
1445         @$(if $(board-dirs), \
1446                 $(foreach b, $(board-dirs), \
1447                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1448                 printf "  %-16s - Show all of the above\\n" help-boards; \
1449                 echo '')
1450
1451         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1452         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1453         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1454         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1455         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1456         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1457         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1458         @echo  '                1: warnings which may be relevant and do not occur too often'
1459         @echo  '                2: warnings which occur quite often but may still be relevant'
1460         @echo  '                3: more obscure warnings, can most likely be ignored'
1461         @echo  '                Multiple levels can be combined with W=12 or W=123'
1462         @echo  ''
1463         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1464         @echo  'For further info see the ./README file'
1465
1466
1467 help-board-dirs := $(addprefix help-,$(board-dirs))
1468
1469 help-boards: $(help-board-dirs)
1470
1471 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1472
1473 $(help-board-dirs): help-%:
1474         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1475         @$(if $(boards-per-dir), \
1476                 $(foreach b, $(boards-per-dir), \
1477                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1478                 echo '')
1479
1480
1481 # Documentation targets
1482 # ---------------------------------------------------------------------------
1483 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1484                linkcheckdocs dochelp refcheckdocs
1485 PHONY += $(DOC_TARGETS)
1486 $(DOC_TARGETS): scripts_basic FORCE
1487         $(Q)$(MAKE) $(build)=Documentation $@
1488
1489 else # KBUILD_EXTMOD
1490
1491 ###
1492 # External module support.
1493 # When building external modules the kernel used as basis is considered
1494 # read-only, and no consistency checks are made and the make
1495 # system is not used on the basis kernel. If updates are required
1496 # in the basis kernel ordinary make commands (without M=...) must
1497 # be used.
1498 #
1499 # The following are the only valid targets when building external
1500 # modules.
1501 # make M=dir clean     Delete all automatically generated files
1502 # make M=dir modules   Make all modules in specified dir
1503 # make M=dir           Same as 'make M=dir modules'
1504 # make M=dir modules_install
1505 #                      Install the modules built in the module directory
1506 #                      Assumes install directory is already created
1507
1508 # We are always building modules
1509 KBUILD_MODULES := 1
1510
1511 PHONY += $(objtree)/Module.symvers
1512 $(objtree)/Module.symvers:
1513         @test -e $(objtree)/Module.symvers || ( \
1514         echo; \
1515         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1516         echo "           is missing; modules will have no dependencies and modversions."; \
1517         echo )
1518
1519 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1520 PHONY += $(module-dirs) modules
1521 $(module-dirs): prepare $(objtree)/Module.symvers
1522         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1523
1524 modules: $(module-dirs)
1525         @$(kecho) '  Building modules, stage 2.';
1526         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1527
1528 PHONY += modules_install
1529 modules_install: _emodinst_ _emodinst_post
1530
1531 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1532 PHONY += _emodinst_
1533 _emodinst_:
1534         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1535         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1536
1537 PHONY += _emodinst_post
1538 _emodinst_post: _emodinst_
1539         $(call cmd,depmod)
1540
1541 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1542
1543 PHONY += $(clean-dirs) clean
1544 $(clean-dirs):
1545         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1546
1547 clean:  rm-dirs := $(MODVERDIR)
1548 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1549
1550 PHONY += help
1551 help:
1552         @echo  '  Building external modules.'
1553         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1554         @echo  ''
1555         @echo  '  modules         - default target, build the module(s)'
1556         @echo  '  modules_install - install the module'
1557         @echo  '  clean           - remove generated files in module directory only'
1558         @echo  ''
1559
1560 # Dummies...
1561 PHONY += prepare scripts
1562 prepare:
1563         $(cmd_crmodverdir)
1564 scripts: ;
1565 endif # KBUILD_EXTMOD
1566
1567 clean: $(clean-dirs)
1568         $(call cmd,rmdirs)
1569         $(call cmd,rmfiles)
1570         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1571                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1572                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1573                 -o -name '*.dwo' -o -name '*.lst' \
1574                 -o -name '*.su'  \
1575                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1576                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1577                 -o -name '*.asn1.[ch]' \
1578                 -o -name '*.symtypes' -o -name 'modules.order' \
1579                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1580                 -o -name '*.c.[012]*.*' \
1581                 -o -name '*.ll' \
1582                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1583
1584 # Generate tags for editors
1585 # ---------------------------------------------------------------------------
1586 quiet_cmd_tags = GEN     $@
1587       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1588
1589 tags TAGS cscope gtags: FORCE
1590         $(call cmd,tags)
1591
1592 # Scripts to check various things for consistency
1593 # ---------------------------------------------------------------------------
1594
1595 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1596
1597 includecheck:
1598         find $(srctree)/* $(RCS_FIND_IGNORE) \
1599                 -name '*.[hcS]' -type f -print | sort \
1600                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1601
1602 versioncheck:
1603         find $(srctree)/* $(RCS_FIND_IGNORE) \
1604                 -name '*.[hcS]' -type f -print | sort \
1605                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1606
1607 coccicheck:
1608         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1609
1610 namespacecheck:
1611         $(PERL) $(srctree)/scripts/namespace.pl
1612
1613 export_report:
1614         $(PERL) $(srctree)/scripts/export_report.pl
1615
1616 endif #ifeq ($(config-targets),1)
1617 endif #ifeq ($(mixed-targets),1)
1618
1619 PHONY += checkstack kernelrelease kernelversion image_name
1620
1621 # UML needs a little special treatment here.  It wants to use the host
1622 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1623 # else wants $(ARCH), including people doing cross-builds, which means
1624 # that $(SUBARCH) doesn't work here.
1625 ifeq ($(ARCH), um)
1626 CHECKSTACK_ARCH := $(SUBARCH)
1627 else
1628 CHECKSTACK_ARCH := $(ARCH)
1629 endif
1630 checkstack:
1631         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1632         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1633
1634 kernelrelease:
1635         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1636
1637 kernelversion:
1638         @echo $(KERNELVERSION)
1639
1640 image_name:
1641         @echo $(KBUILD_IMAGE)
1642
1643 # Clear a bunch of variables before executing the submake
1644 tools/: FORCE
1645         $(Q)mkdir -p $(objtree)/tools
1646         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1647
1648 tools/%: FORCE
1649         $(Q)mkdir -p $(objtree)/tools
1650         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1651
1652 # Single targets
1653 # ---------------------------------------------------------------------------
1654 # Single targets are compatible with:
1655 # - build with mixed source and output
1656 # - build with separate output dir 'make O=...'
1657 # - external modules
1658 #
1659 #  target-dir => where to store outputfile
1660 #  build-dir  => directory in kernel source tree to use
1661
1662 ifeq ($(KBUILD_EXTMOD),)
1663         build-dir  = $(patsubst %/,%,$(dir $@))
1664         target-dir = $(dir $@)
1665 else
1666         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1667         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1668         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1669 endif
1670
1671 %.s: %.c prepare scripts FORCE
1672         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1673 %.i: %.c prepare scripts FORCE
1674         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1675 %.o: %.c prepare scripts FORCE
1676         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1677 %.lst: %.c prepare scripts FORCE
1678         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1679 %.s: %.S prepare scripts FORCE
1680         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1681 %.o: %.S prepare scripts FORCE
1682         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1683 %.symtypes: %.c prepare scripts FORCE
1684         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1685 %.ll: %.c prepare scripts FORCE
1686         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1687
1688 # Modules
1689 /: prepare scripts FORCE
1690         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1691         $(build)=$(build-dir)
1692 # Make sure the latest headers are built for Documentation
1693 Documentation/ samples/: headers_install
1694 %/: prepare scripts FORCE
1695         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1696         $(build)=$(build-dir)
1697 %.ko: prepare scripts FORCE
1698         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1699         $(build)=$(build-dir) $(@:.ko=.o)
1700         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1701
1702 # FIXME Should go into a make.lib or something
1703 # ===========================================================================
1704
1705 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1706       cmd_rmdirs = rm -rf $(rm-dirs)
1707
1708 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1709       cmd_rmfiles = rm -f $(rm-files)
1710
1711 # Run depmod only if we have System.map and depmod is executable
1712 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1713       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1714                    $(KERNELRELEASE)
1715
1716 # Create temporary dir for module support files
1717 # clean it up only when building all modules
1718 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1719                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1720
1721 # read all saved command lines
1722
1723 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1724
1725 ifneq ($(cmd_files),)
1726   $(cmd_files): ;       # Do not try to update included dependency files
1727   include $(cmd_files)
1728 endif
1729
1730 endif   # skip-makefile
1731
1732 PHONY += FORCE
1733 FORCE:
1734
1735 # Declare the contents of the PHONY variable as phony.  We keep that
1736 # information in a variable so we can use it in if_changed and friends.
1737 .PHONY: $(PHONY)