Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 15
   4 SUBLEVEL = 18
   5 EXTRAVERSION =
   6 NAME = Fearless Coyote
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.o targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Call message checker as part of the C compilation
 180 #
 181 # Use 'make D=1' to enable checking
 182 # Use 'make D=2' to create the message catalog
 183
 184 ifdef D
 185   ifeq ("$(origin D)", "command line")
 186     KBUILD_KMSG_CHECK = $(D)
 187   endif
 188 endif
 189 ifndef KBUILD_KMSG_CHECK
 190   KBUILD_KMSG_CHECK = 0
 191 endif
 192
 193 # Use make M=dir to specify directory of external module to build
 194 # Old syntax make ... SUBDIRS=$PWD is still supported
 195 # Setting the environment variable KBUILD_EXTMOD take precedence
 196 ifdef SUBDIRS
 197   KBUILD_EXTMOD ?= $(SUBDIRS)
 198 endif
 199
 200 ifeq ("$(origin M)", "command line")
 201   KBUILD_EXTMOD := $(M)
 202 endif
 203
 204 ifeq ($(KBUILD_SRC),)
 205         # building in the source tree
 206         srctree := .
 207 else
 208         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 209                 # building in a subdirectory of the source tree
 210                 srctree := ..
 211         else
 212                 srctree := $(KBUILD_SRC)
 213         endif
 214 endif
 215
 216 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 217
 218 objtree         := .
 219 src             := $(srctree)
 220 obj             := $(objtree)
 221
 222 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 223
 224 export srctree objtree VPATH
 225
 226 # To make sure we do not include .config for any of the *config targets
 227 # catch them early, and hand them over to scripts/kconfig/Makefile
 228 # It is allowed to specify more targets when calling make, including
 229 # mixing *config targets and build targets.
 230 # For example 'make oldconfig all'.
 231 # Detect when mixed targets is specified, and make a second invocation
 232 # of make so .config is not included in this case either (for *config).
 233
 234 version_h := include/generated/uapi/linux/version.h
 235 old_version_h := include/linux/version.h
 236
 237 no-dot-config-targets := clean mrproper distclean \
 238                          cscope gtags TAGS tags help% %docs check% coccicheck \
 239                          $(version_h) headers_% archheaders archscripts \
 240                          kernelversion %src-pkg
 241 no-sync-config-targets := $(no-dot-config-targets) install %install
 242
 243 config-targets  := 0
 244 mixed-targets   := 0
 245 dot-config      := 1
 246 may-sync-config := 1
 247
 248 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 249         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 250                 dot-config := 0
 251         endif
 252 endif
 253
 254 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 255         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 256                 may-sync-config := 0
 257         endif
 258 endif
 259
 260 ifneq ($(KBUILD_EXTMOD),)
 261         may-sync-config := 0
 262 endif
 263
 264 ifeq ($(KBUILD_EXTMOD),)
 265         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 266                 config-targets := 1
 267                 ifneq ($(words $(MAKECMDGOALS)),1)
 268                         mixed-targets := 1
 269                 endif
 270         endif
 271 endif
 272 # install and modules_install need also be processed one by one
 273 ifneq ($(filter install,$(MAKECMDGOALS)),)
 274         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 275                 mixed-targets := 1
 276         endif
 277 endif
 278
 279 ifeq ($(mixed-targets),1)
 280 # ===========================================================================
 281 # We're called with mixed targets (*config and build targets).
 282 # Handle them one by one.
 283
 284 PHONY += $(MAKECMDGOALS) __build_one_by_one
 285
 286 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 287         @:
 288
 289 __build_one_by_one:
 290         $(Q)set -e; \
 291         for i in $(MAKECMDGOALS); do \
 292                 $(MAKE) -f $(srctree)/Makefile $$i; \
 293         done
 294
 295 else
 296
 297 # We need some generic definitions (do not try to remake the file).
 298 scripts/Kbuild.include: ;
 299 include scripts/Kbuild.include
 300
 301 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 302 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 303 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 304 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 305
 306 include scripts/subarch.include
 307
 308 # Cross compiling and selecting different set of gcc/bin-utils
 309 # ---------------------------------------------------------------------------
 310 #
 311 # When performing cross compilation for other architectures ARCH shall be set
 312 # to the target architecture. (See arch/* for the possibilities).
 313 # ARCH can be set during invocation of make:
 314 # make ARCH=ia64
 315 # Another way is to have ARCH set in the environment.
 316 # The default ARCH is the host where make is executed.
 317
 318 # CROSS_COMPILE specify the prefix used for all executables used
 319 # during compilation. Only gcc and related bin-utils executables
 320 # are prefixed with $(CROSS_COMPILE).
 321 # CROSS_COMPILE can be set on the command line
 322 # make CROSS_COMPILE=ia64-linux-
 323 # Alternatively CROSS_COMPILE can be set in the environment.
 324 # A third alternative is to store a setting in .config so that plain
 325 # "make" in the configured kernel build directory always uses that.
 326 # Default value for CROSS_COMPILE is not to prefix executables
 327 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 328 ARCH            ?= $(SUBARCH)
 329 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 330
 331 # Architecture as present in compile.h
 332 UTS_MACHINE     := $(ARCH)
 333 SRCARCH         := $(ARCH)
 334
 335 # Additional ARCH settings for x86
 336 ifeq ($(ARCH),i386)
 337         SRCARCH := x86
 338 endif
 339 ifeq ($(ARCH),x86_64)
 340         SRCARCH := x86
 341 endif
 342
 343 # Additional ARCH settings for sparc
 344 ifeq ($(ARCH),sparc32)
 345        SRCARCH := sparc
 346 endif
 347 ifeq ($(ARCH),sparc64)
 348        SRCARCH := sparc
 349 endif
 350
 351 # Additional ARCH settings for sh
 352 ifeq ($(ARCH),sh64)
 353        SRCARCH := sh
 354 endif
 355
 356 # Additional ARCH settings for tile
 357 ifeq ($(ARCH),tilepro)
 358        SRCARCH := tile
 359 endif
 360 ifeq ($(ARCH),tilegx)
 361        SRCARCH := tile
 362 endif
 363
 364 KCONFIG_CONFIG  ?= .config
 365 export KCONFIG_CONFIG
 366
 367 # SHELL used by kbuild
 368 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 369           else if [ -x /bin/bash ]; then echo /bin/bash; \
 370           else echo sh; fi ; fi)
 371
 372 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 373 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 374 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 375
 376 HOSTCC       = gcc
 377 HOSTCXX      = g++
 378 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 379                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 380 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 381 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 382 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 383
 384 # Make variables (CC, etc...)
 385 AS              = $(CROSS_COMPILE)as
 386 LD              = $(CROSS_COMPILE)ld
 387 CC              = $(CROSS_COMPILE)gcc
 388 CPP             = $(CC) -E
 389 AR              = $(CROSS_COMPILE)ar
 390 NM              = $(CROSS_COMPILE)nm
 391 STRIP           = $(CROSS_COMPILE)strip
 392 OBJCOPY         = $(CROSS_COMPILE)objcopy
 393 OBJDUMP         = $(CROSS_COMPILE)objdump
 394 AWK             = awk
 395 GENKSYMS        = scripts/genksyms/genksyms
 396 INSTALLKERNEL  := installkernel
 397 DEPMOD          = /sbin/depmod
 398 PERL            = perl
 399 PYTHON          = python
 400 CHECK           = sparse
 401
 402 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 403                   -Wbitwise -Wno-return-void $(CF)
 404 KMSG_CHECK      = $(srctree)/scripts/kmsg-doc
 405 NOSTDINC_FLAGS  =
 406 CFLAGS_MODULE   =
 407 AFLAGS_MODULE   =
 408 LDFLAGS_MODULE  =
 409 CFLAGS_KERNEL   =
 410 AFLAGS_KERNEL   =
 411 LDFLAGS_vmlinux =
 412
 413 # Prefer linux-backports-modules
 414 ifneq ($(KBUILD_SRC),)
 415 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
 416 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
 417 endif
 418 endif
 419
 420 # Use USERINCLUDE when you must reference the UAPI directories only.
 421 USERINCLUDE    := \
 422                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 423                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 424                 -I$(srctree)/include/uapi \
 425                 -I$(objtree)/include/generated/uapi \
 426                 -include $(srctree)/include/linux/kconfig.h
 427
 428 # Use LINUXINCLUDE when you must reference the include/ directory.
 429 # Needed to be compatible with the O= option
 430 LINUXINCLUDE    := \
 431                 $(UBUNTUINCLUDE) \
 432                 -I$(srctree)/arch/$(SRCARCH)/include \
 433                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 434                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 435                 -I$(objtree)/include \
 436                 $(USERINCLUDE)
 437
 438 # UBUNTU: Include our third party driver stuff too
 439 LINUXINCLUDE   += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
 440
 441 KBUILD_AFLAGS   := -D__ASSEMBLY__
 442 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 443                    -fno-strict-aliasing -fno-common -fshort-wchar \
 444                    -Werror-implicit-function-declaration \
 445                    -Wno-format-security \
 446                    -std=gnu89
 447 KBUILD_CPPFLAGS := -D__KERNEL__
 448 KBUILD_AFLAGS_KERNEL :=
 449 KBUILD_CFLAGS_KERNEL :=
 450 KBUILD_AFLAGS_MODULE  := -DMODULE
 451 KBUILD_CFLAGS_MODULE  := -DMODULE
 452 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 453 GCC_PLUGINS_CFLAGS :=
 454 CLANG_FLAGS :=
 455
 456 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 457 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 458 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 459 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 460
 461 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 462 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 463 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 464 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 465 export KBUILD_KMSG_CHECK KMSG_CHECK
 466 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 467 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 468 export KBUILD_ARFLAGS
 469
 470 # When compiling out-of-tree modules, put MODVERDIR in the module
 471 # tree rather than in the kernel tree. The kernel tree might
 472 # even be read-only.
 473 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 474
 475 # Files to ignore in find ... statements
 476
 477 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 478                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 479                           -prune -o
 480 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 481                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 482
 483 # ===========================================================================
 484 # Rules shared between *config targets and build targets
 485
 486 # Basic helpers built in scripts/basic/
 487 PHONY += scripts_basic
 488 scripts_basic:
 489         $(Q)$(MAKE) $(build)=scripts/basic
 490         $(Q)rm -f .tmp_quiet_recordmcount
 491
 492 # To avoid any implicit rule to kick in, define an empty command.
 493 scripts/basic/%: scripts_basic ;
 494
 495 PHONY += outputmakefile
 496 # outputmakefile generates a Makefile in the output directory, if using a
 497 # separate output directory. This allows convenient use of make in the
 498 # output directory.
 499 outputmakefile:
 500 ifneq ($(KBUILD_SRC),)
 501         $(Q)ln -fsn $(srctree) source
 502         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 503             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 504 endif
 505
 506 ifeq ($(cc-name),clang)
 507 ifneq ($(CROSS_COMPILE),)
 508 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 509 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 510 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 511 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 512 endif
 513 ifneq ($(GCC_TOOLCHAIN),)
 514 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 515 endif
 516 CLANG_FLAGS     += -no-integrated-as
 517 CLANG_FLAGS     += -Werror=unknown-warning-option
 518 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 519 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 520 export CLANG_FLAGS
 521 endif
 522
 523 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 524 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 525 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 526 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 527 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 528 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 529 export RETPOLINE_CFLAGS
 530 export RETPOLINE_VDSO_CFLAGS
 531
 532 ifeq ($(config-targets),1)
 533 # ===========================================================================
 534 # *config targets only - make sure prerequisites are updated, and descend
 535 # in scripts/kconfig to make the *config target
 536
 537 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 538 # KBUILD_DEFCONFIG may point out an alternative default configuration
 539 # used for 'make defconfig'
 540 include arch/$(SRCARCH)/Makefile
 541 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 542
 543 config: scripts_basic outputmakefile FORCE
 544         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 545
 546 %config: scripts_basic outputmakefile FORCE
 547         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 548
 549 else
 550 # ===========================================================================
 551 # Build targets only - this includes vmlinux, arch specific targets, clean
 552 # targets and others. In general all targets except *config targets.
 553
 554 # If building an external module we do not care about the all: rule
 555 # but instead _all depend on modules
 556 PHONY += all
 557 ifeq ($(KBUILD_EXTMOD),)
 558 _all: all
 559 else
 560 _all: modules
 561 endif
 562
 563 # Decide whether to build built-in, modular, or both.
 564 # Normally, just do built-in.
 565
 566 KBUILD_MODULES :=
 567 KBUILD_BUILTIN := 1
 568
 569 # If we have only "make modules", don't compile built-in objects.
 570 # When we're building modules with modversions, we need to consider
 571 # the built-in objects during the descend as well, in order to
 572 # make sure the checksums are up to date before we record them.
 573
 574 ifeq ($(MAKECMDGOALS),modules)
 575   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 576 endif
 577
 578 # If we have "make <whatever> modules", compile modules
 579 # in addition to whatever we do anyway.
 580 # Just "make" or "make all" shall build modules as well
 581
 582 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 583   KBUILD_MODULES := 1
 584 endif
 585
 586 ifeq ($(MAKECMDGOALS),)
 587   KBUILD_MODULES := 1
 588 endif
 589
 590 export KBUILD_MODULES KBUILD_BUILTIN
 591
 592 ifeq ($(KBUILD_EXTMOD),)
 593 # Additional helpers built in scripts/
 594 # Carefully list dependencies so we do not try to build scripts twice
 595 # in parallel
 596 PHONY += scripts
 597 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 598          asm-generic gcc-plugins
 599         $(Q)$(MAKE) $(build)=$(@)
 600
 601 # Objects we will link into vmlinux / subdirs we need to visit
 602 init-y          := init/
 603 drivers-y       := drivers/ sound/ firmware/ ubuntu/
 604 net-y           := net/
 605 libs-y          := lib/
 606 core-y          := usr/
 607 virt-y          := virt/
 608 endif # KBUILD_EXTMOD
 609
 610 ifeq ($(dot-config),1)
 611 # Read in config
 612 -include include/config/auto.conf
 613
 614 ifeq ($(may-sync-config),1)
 615 # Read in dependencies to all Kconfig* files, make sure to run
 616 # oldconfig if changes are detected.
 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 # If .config is newer than include/config/auto.conf, someone tinkered
 623 # with it and forgot to run make oldconfig.
 624 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 625 # we execute the config step to be sure to catch updated Kconfig files
 626 #
 627 # This exploits the 'multi-target pattern rule' trick.
 628 # The syncconfig should be executed only once to make all the targets.
 629 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 630         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 631 else
 632 # External modules and some install targets need include/generated/autoconf.h
 633 # and include/config/auto.conf but do not care if they are up-to-date.
 634 # Use auto.conf to trigger the test
 635 PHONY += include/config/auto.conf
 636
 637 include/config/auto.conf:
 638         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 639         echo >&2;                                                       \
 640         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 641         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 642         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 643         echo >&2 ;                                                      \
 644         /bin/false)
 645
 646 endif # may-sync-config
 647
 648 else
 649 # Dummy target needed, because used as prerequisite
 650 include/config/auto.conf: ;
 651 endif # $(dot-config)
 652
 653 # For the kernel to actually contain only the needed exported symbols,
 654 # we have to build modules as well to determine what those symbols are.
 655 # (this can be evaluated only once include/config/auto.conf has been included)
 656 ifdef CONFIG_TRIM_UNUSED_KSYMS
 657   KBUILD_MODULES := 1
 658 endif
 659
 660 # The all: target is the default when no target is given on the
 661 # command line.
 662 # This allow a user to issue only 'make' to build a kernel including modules
 663 # Defaults to vmlinux, but the arch makefile usually adds further targets
 664 all: vmlinux
 665
 666 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 667 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 668 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 669 export CFLAGS_GCOV CFLAGS_KCOV
 670
 671 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 672 # values of the respective KBUILD_* variables
 673 ARCH_CPPFLAGS :=
 674 ARCH_AFLAGS :=
 675 ARCH_CFLAGS :=
 676 include arch/$(SRCARCH)/Makefile
 677
 678 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 679 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 680 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 681 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 682 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 683 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 684 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 685
 686 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 687 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 688 else
 689 ifdef CONFIG_PROFILE_ALL_BRANCHES
 690 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 691 else
 692 KBUILD_CFLAGS   += -O2
 693 endif
 694 endif
 695
 696 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 697                         $(call cc-disable-warning,maybe-uninitialized,))
 698
 699 # Tell gcc to never replace conditional load with a non-conditional one
 700 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 701
 702 # check for 'asm goto'
 703 ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 704         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 705         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 706 endif
 707
 708 include scripts/Makefile.kcov
 709 include scripts/Makefile.gcc-plugins
 710
 711 ifdef CONFIG_READABLE_ASM
 712 # Disable optimizations that make assembler listings hard to read.
 713 # reorder blocks reorders the control in the function
 714 # ipa clone creates specialized cloned functions
 715 # partial inlining inlines only parts of functions
 716 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 717                  $(call cc-option,-fno-ipa-cp-clone,) \
 718                  $(call cc-option,-fno-partial-inlining)
 719 endif
 720
 721 ifneq ($(CONFIG_FRAME_WARN),0)
 722 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 723 endif
 724
 725 # This selects the stack protector compiler flag. Testing it is delayed
 726 # until after .config has been reprocessed, in the prepare-compiler-check
 727 # target.
 728 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 729   stackp-flag := -fstack-protector
 730   stackp-name := REGULAR
 731 else
 732 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 733   stackp-flag := -fstack-protector-strong
 734   stackp-name := STRONG
 735 else
 736   # Force off for distro compilers that enable stack protector by default.
 737   stackp-flag := $(call cc-option, -fno-stack-protector)
 738 endif
 739 endif
 740 # Find arch-specific stack protector compiler sanity-checking script.
 741 ifdef CONFIG_CC_STACKPROTECTOR
 742   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 743   stackp-check := $(wildcard $(stackp-path))
 744 endif
 745 KBUILD_CFLAGS += $(stackp-flag)
 746
 747 ifeq ($(cc-name),clang)
 748 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 749 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 750 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 751 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 752 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 753 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 754 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 755 # See modpost pattern 2
 756 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 757 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 758 else
 759
 760 # These warnings generated too much noise in a regular build.
 761 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 762 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 763 endif
 764
 765 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 766 ifdef CONFIG_FRAME_POINTER
 767 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 768 else
 769 # Some targets (ARM with Thumb2, for example), can't be built with frame
 770 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 771 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 772 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 773 # -fomit-frame-pointer with FUNCTION_TRACER.
 774 ifndef CONFIG_FUNCTION_TRACER
 775 KBUILD_CFLAGS   += -fomit-frame-pointer
 776 endif
 777 endif
 778
 779 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 780
 781 ifdef CONFIG_DEBUG_INFO
 782 ifdef CONFIG_DEBUG_INFO_SPLIT
 783 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 784 else
 785 KBUILD_CFLAGS   += -g
 786 endif
 787 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 788 endif
 789 ifdef CONFIG_DEBUG_INFO_DWARF4
 790 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 791 endif
 792
 793 ifdef CONFIG_DEBUG_INFO_REDUCED
 794 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 795                    $(call cc-option,-fno-var-tracking)
 796 endif
 797
 798 ifdef CONFIG_FUNCTION_TRACER
 799 ifndef CC_FLAGS_FTRACE
 800 CC_FLAGS_FTRACE := -pg
 801 endif
 802 export CC_FLAGS_FTRACE
 803 ifdef CONFIG_HAVE_FENTRY
 804 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 805 endif
 806 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 807 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 808 ifdef CONFIG_DYNAMIC_FTRACE
 809         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 810                 BUILD_C_RECORDMCOUNT := y
 811                 export BUILD_C_RECORDMCOUNT
 812         endif
 813 endif
 814 endif
 815
 816 # We trigger additional mismatches with less inlining
 817 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 818 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 819 endif
 820
 821 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 822 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 823 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 824 endif
 825
 826 # arch Makefile may override CC so keep this after arch Makefile is included
 827 NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
 828 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 829
 830 # warn about C99 declaration after statement
 831 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 832
 833 # disable pointer signed / unsigned warnings in gcc 4.0
 834 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 835
 836 # disable stringop warnings in gcc 8+
 837 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 838
 839 # disable invalid "can't wrap" optimizations for signed / pointers
 840 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 841
 842 # clang sets -fmerge-all-constants by default as optimization, but this
 843 # is non-conforming behavior for C and in fact breaks the kernel, so we
 844 # need to disable it here generally.
 845 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 846
 847 # for gcc -fno-merge-all-constants disables everything, but it is fine
 848 # to have actual conforming behavior enabled.
 849 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 850
 851 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 852 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 853
 854 # conserve stack if available
 855 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 856
 857 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 858 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 859
 860 # require functions to have arguments in prototypes, not empty 'int foo()'
 861 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 862
 863 # Prohibit date/time macros, which would make the build non-deterministic
 864 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 865
 866 # enforce correct pointer usage
 867 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 868
 869 # Require designated initializers for all marked structures
 870 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 871
 872 # ensure -fcf-protection is disabled when using retpoline as it is
 873 # incompatible with -mindirect-branch=thunk-extern
 874 ifdef CONFIG_RETPOLINE
 875 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 876 endif
 877
 878 # change __FILE__ to the relative path from the srctree
 879 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 880
 881 # use the deterministic mode of AR if available
 882 KBUILD_ARFLAGS := $(call ar-option,D)
 883
 884 include scripts/Makefile.kasan
 885 include scripts/Makefile.extrawarn
 886 include scripts/Makefile.ubsan
 887
 888 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 889 # last assignments
 890 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 891 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 892 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 893
 894 # Use --build-id when available.
 895 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 896                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 897 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 898 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 899
 900 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 901 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 902 endif
 903
 904 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 905 LDFLAGS_vmlinux += $(call ld-option, -X,)
 906 endif
 907
 908 # Default kernel image to build when no specific target is given.
 909 # KBUILD_IMAGE may be overruled on the command line or
 910 # set in the environment
 911 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 912 # this default value
 913 export KBUILD_IMAGE ?= vmlinux
 914
 915 #
 916 # INSTALL_PATH specifies where to place the updated kernel and system map
 917 # images. Default is /boot, but you can set it to other values
 918 export  INSTALL_PATH ?= /boot
 919
 920 #
 921 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 922 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 923 # an argument if needed. Otherwise it defaults to the kernel install path
 924 #
 925 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 926
 927 #
 928 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 929 # relocations required by build roots.  This is not defined in the
 930 # makefile but the argument can be passed to make if needed.
 931 #
 932
 933 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 934 export MODLIB
 935
 936 #
 937 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 938 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 939 # the default option --strip-debug will be used.  Otherwise,
 940 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 941
 942 ifdef INSTALL_MOD_STRIP
 943 ifeq ($(INSTALL_MOD_STRIP),1)
 944 mod_strip_cmd = $(STRIP) --strip-debug
 945 else
 946 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 947 endif # INSTALL_MOD_STRIP=1
 948 else
 949 mod_strip_cmd = true
 950 endif # INSTALL_MOD_STRIP
 951 export mod_strip_cmd
 952
 953 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 954 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 955 # or CONFIG_MODULE_COMPRESS_XZ.
 956
 957 mod_compress_cmd = true
 958 ifdef CONFIG_MODULE_COMPRESS
 959   ifdef CONFIG_MODULE_COMPRESS_GZIP
 960     mod_compress_cmd = gzip -n -f
 961   endif # CONFIG_MODULE_COMPRESS_GZIP
 962   ifdef CONFIG_MODULE_COMPRESS_XZ
 963     mod_compress_cmd = xz -f
 964   endif # CONFIG_MODULE_COMPRESS_XZ
 965 endif # CONFIG_MODULE_COMPRESS
 966 export mod_compress_cmd
 967
 968 # Select initial ramdisk compression format, default is gzip(1).
 969 # This shall be used by the dracut(8) tool while creating an initramfs image.
 970 #
 971 INITRD_COMPRESS-y                  := gzip
 972 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 973 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 974 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 975 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 976 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 977 # do not export INITRD_COMPRESS, since we didn't actually
 978 # choose a sane default compression above.
 979 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 980
 981 ifdef CONFIG_MODULE_SIG_ALL
 982 $(eval $(call config_filename,MODULE_SIG_KEY))
 983
 984 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 985 else
 986 mod_sign_cmd = true
 987 endif
 988 export mod_sign_cmd
 989
 990 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 991
 992 ifdef CONFIG_STACK_VALIDATION
 993   has_libelf := $(call try-run,\
 994                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 995   ifeq ($(has_libelf),1)
 996     objtool_target := tools/objtool FORCE
 997   else
 998     SKIP_STACK_VALIDATION := 1
 999     export SKIP_STACK_VALIDATION
1000   endif
1001 endif
1002
1003
1004 ifeq ($(KBUILD_EXTMOD),)
1005 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1006
1007 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1008                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1009                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1010
1011 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
1012                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1013
1014 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
1015 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
1016 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
1017 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
1018 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1019 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
1020 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
1021
1022 # Externally visible symbols (used by link-vmlinux.sh)
1023 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1024 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1025 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1026 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1027 export LDFLAGS_vmlinux
1028 # used by scripts/package/Makefile
1029 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1030
1031 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1032
1033 # Include targets which we want to execute sequentially if the rest of the
1034 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1035 # evaluated more than once.
1036 PHONY += vmlinux_prereq
1037 vmlinux_prereq: $(vmlinux-deps) FORCE
1038 ifdef CONFIG_HEADERS_CHECK
1039         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1040 endif
1041 ifdef CONFIG_GDB_SCRIPTS
1042         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1043 endif
1044 ifdef CONFIG_TRIM_UNUSED_KSYMS
1045         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1046           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1047 endif
1048
1049 # standalone target for easier testing
1050 include/generated/autoksyms.h: FORCE
1051         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1052
1053 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1054
1055 # Final link of vmlinux with optional arch pass after final link
1056 cmd_link-vmlinux =                                                 \
1057         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1058         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1059
1060 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1061         +$(call if_changed,link-vmlinux)
1062
1063 # Build samples along the rest of the kernel
1064 ifdef CONFIG_SAMPLES
1065 vmlinux-dirs += samples
1066 endif
1067
1068 # The actual objects are generated when descending,
1069 # make sure no implicit rule kicks in
1070 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1071
1072 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1073 # Preset locale variables to speed up the build process. Limit locale
1074 # tweaks to this spot to avoid wrong language settings when running
1075 # make menuconfig etc.
1076 # Error messages still appears in the original language
1077
1078 PHONY += $(vmlinux-dirs)
1079 $(vmlinux-dirs): prepare scripts
1080         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1081
1082 define filechk_kernel.release
1083         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1084 endef
1085
1086 # Store (new) KERNELRELEASE string in include/config/kernel.release
1087 include/config/kernel.release: include/config/auto.conf FORCE
1088         $(call filechk,kernel.release)
1089
1090
1091 # Things we need to do before we recursively start building the kernel
1092 # or the modules are listed in "prepare".
1093 # A multi level approach is used. prepareN is processed before prepareN-1.
1094 # archprepare is used in arch Makefiles and when processed asm symlink,
1095 # version.h and scripts_basic is processed / created.
1096
1097 # Listed in dependency order
1098 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1099
1100 # prepare3 is used to check if we are building in a separate output directory,
1101 # and if so do:
1102 # 1) Check that make has not been executed in the kernel src $(srctree)
1103 prepare3: include/config/kernel.release
1104 ifneq ($(KBUILD_SRC),)
1105         @$(kecho) '  Using $(srctree) as source for kernel'
1106         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1107                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1108                 echo >&2 "  in the '$(srctree)' directory.";\
1109                 /bin/false; \
1110         fi;
1111 endif
1112
1113 # prepare2 creates a makefile if using a separate output directory.
1114 # From this point forward, .config has been reprocessed, so any rules
1115 # that need to depend on updated CONFIG_* values can be checked here.
1116 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1117
1118 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1119                    include/config/auto.conf
1120         $(cmd_crmodverdir)
1121
1122 archprepare: archheaders archscripts prepare1 scripts_basic
1123
1124 prepare0: archprepare gcc-plugins
1125         $(Q)$(MAKE) $(build)=.
1126
1127 # All the preparing..
1128 prepare: prepare0 prepare-objtool
1129
1130 # Support for using generic headers in asm-generic
1131 PHONY += asm-generic uapi-asm-generic
1132 asm-generic: uapi-asm-generic
1133         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1134                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1135 uapi-asm-generic:
1136         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1137                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1138
1139 PHONY += prepare-objtool
1140 prepare-objtool: $(objtool_target)
1141 ifeq ($(SKIP_STACK_VALIDATION),1)
1142 ifdef CONFIG_UNWINDER_ORC
1143         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1144         @false
1145 else
1146         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1147 endif
1148 endif
1149
1150 # Check for CONFIG flags that require compiler support. Abort the build
1151 # after .config has been processed, but before the kernel build starts.
1152 #
1153 # For security-sensitive CONFIG options, we don't want to fallback and/or
1154 # silently change which compiler flags will be used, since that leads to
1155 # producing kernels with different security feature characteristics
1156 # depending on the compiler used. (For example, "But I selected
1157 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1158 PHONY += prepare-compiler-check
1159 prepare-compiler-check: FORCE
1160 # Make sure compiler supports requested stack protector flag.
1161 ifdef stackp-name
1162   ifeq ($(call cc-option, $(stackp-flag)),)
1163         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1164                   $(stackp-flag) not supported by compiler >&2 && exit 1
1165   endif
1166 endif
1167 # Make sure compiler does not have buggy stack-protector support.
1168 ifdef stackp-check
1169   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1170         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1171                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1172   endif
1173 endif
1174         @:
1175
1176 # Generate some files
1177 # ---------------------------------------------------------------------------
1178
1179 # KERNELRELEASE can change from a few different places, meaning version.h
1180 # needs to be updated, so this check is forced on all builds
1181
1182 uts_len := 64
1183 define filechk_utsrelease.h
1184         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1185           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1186           exit 1;                                                         \
1187         fi;                                                               \
1188         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1189 endef
1190
1191 define filechk_version.h
1192         (echo \#define LINUX_VERSION_CODE $(shell                         \
1193         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1194         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1195 endef
1196
1197 $(version_h): $(srctree)/Makefile FORCE
1198         $(call filechk,version.h)
1199         $(Q)rm -f $(old_version_h)
1200
1201 include/generated/utsrelease.h: include/config/kernel.release FORCE
1202         $(call filechk,utsrelease.h)
1203
1204 PHONY += headerdep
1205 headerdep:
1206         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1207         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1208
1209 # ---------------------------------------------------------------------------
1210 # Kernel headers
1211
1212 #Default location for installed headers
1213 export INSTALL_HDR_PATH = $(objtree)/usr
1214
1215 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1216 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1217
1218 PHONY += archheaders
1219 archheaders:
1220
1221 PHONY += archscripts
1222 archscripts:
1223
1224 PHONY += __headers
1225 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1226         $(Q)$(MAKE) $(build)=scripts build_unifdef
1227
1228 PHONY += headers_install_all
1229 headers_install_all:
1230         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1231
1232 PHONY += headers_install
1233 headers_install: __headers
1234         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1235           $(error Headers not exportable for the $(SRCARCH) architecture))
1236         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1237         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1238         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1239
1240 PHONY += headers_check_all
1241 headers_check_all: headers_install_all
1242         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1243
1244 PHONY += headers_check
1245 headers_check: headers_install
1246         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1247         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1248         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1249
1250 # ---------------------------------------------------------------------------
1251 # Kernel selftest
1252
1253 PHONY += kselftest
1254 kselftest:
1255         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1256
1257 PHONY += kselftest-clean
1258 kselftest-clean:
1259         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1260
1261 PHONY += kselftest-merge
1262 kselftest-merge:
1263         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1264         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1265                 -m $(objtree)/.config \
1266                 $(srctree)/tools/testing/selftests/*/config
1267         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1268
1269 # ---------------------------------------------------------------------------
1270 # Modules
1271
1272 ifdef CONFIG_MODULES
1273
1274 # By default, build modules as well
1275
1276 all: modules
1277
1278 # Build modules
1279 #
1280 # A module can be listed more than once in obj-m resulting in
1281 # duplicate lines in modules.order files.  Those are removed
1282 # using awk while concatenating to the final file.
1283
1284 PHONY += modules
1285 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1286         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1287         @$(kecho) '  Building modules, stage 2.';
1288         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1289
1290 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1291         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1292
1293 %/modules.builtin: include/config/auto.conf
1294         $(Q)$(MAKE) $(modbuiltin)=$*
1295
1296
1297 # Target to prepare building external modules
1298 PHONY += modules_prepare
1299 modules_prepare: prepare scripts
1300
1301 # Target to install modules
1302 PHONY += modules_install
1303 modules_install: _modinst_ _modinst_post
1304
1305 PHONY += _modinst_
1306 _modinst_:
1307         @rm -rf $(MODLIB)/kernel
1308         @rm -f $(MODLIB)/source
1309         @mkdir -p $(MODLIB)/kernel
1310         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1311         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1312                 rm -f $(MODLIB)/build ; \
1313                 ln -s $(CURDIR) $(MODLIB)/build ; \
1314         fi
1315         @cp -f $(objtree)/modules.order $(MODLIB)/
1316         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1317         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1318
1319 # This depmod is only for convenience to give the initial
1320 # boot a modules.dep even before / is mounted read-write.  However the
1321 # boot script depmod is the master version.
1322 PHONY += _modinst_post
1323 _modinst_post: _modinst_
1324         $(call cmd,depmod)
1325
1326 ifeq ($(CONFIG_MODULE_SIG), y)
1327 PHONY += modules_sign
1328 modules_sign:
1329         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1330 endif
1331
1332 else # CONFIG_MODULES
1333
1334 # Modules not configured
1335 # ---------------------------------------------------------------------------
1336
1337 PHONY += modules modules_install
1338 modules modules_install:
1339         @echo >&2
1340         @echo >&2 "The present kernel configuration has modules disabled."
1341         @echo >&2 "Type 'make config' and enable loadable module support."
1342         @echo >&2 "Then build a kernel with module support enabled."
1343         @echo >&2
1344         @exit 1
1345
1346 endif # CONFIG_MODULES
1347
1348 ###
1349 # Cleaning is done on three levels.
1350 # make clean     Delete most generated files
1351 #                Leave enough to build external modules
1352 # make mrproper  Delete the current configuration, and all generated files
1353 # make distclean Remove editor backup files, patch leftover files and the like
1354
1355 # Directories & files removed with 'make clean'
1356 CLEAN_DIRS  += $(MODVERDIR)
1357
1358 # Directories & files removed with 'make mrproper'
1359 MRPROPER_DIRS  += include/config usr/include include/generated          \
1360                   arch/*/include/generated .tmp_objdiff
1361 MRPROPER_FILES += .config .config.old .version \
1362                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1363                   signing_key.pem signing_key.priv signing_key.x509     \
1364                   x509.genkey extra_certificates signing_key.x509.keyid \
1365                   signing_key.x509.signer vmlinux-gdb.py
1366
1367 # clean - Delete most, but leave enough to build external modules
1368 #
1369 clean: rm-dirs  := $(CLEAN_DIRS)
1370 clean: rm-files := $(CLEAN_FILES)
1371 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1372
1373 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1374 $(clean-dirs):
1375         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1376
1377 vmlinuxclean:
1378         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1379         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1380
1381 clean: archclean vmlinuxclean
1382
1383 # mrproper - Delete all generated files, including .config
1384 #
1385 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1386 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1387 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1388
1389 PHONY += $(mrproper-dirs) mrproper archmrproper
1390 $(mrproper-dirs):
1391         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1392
1393 mrproper: clean archmrproper $(mrproper-dirs)
1394         $(call cmd,rmdirs)
1395         $(call cmd,rmfiles)
1396
1397 # distclean
1398 #
1399 PHONY += distclean
1400
1401 distclean: mrproper
1402         @find $(srctree) $(RCS_FIND_IGNORE) \
1403                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1404                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1405                 -o -name 'core' \) \
1406                 -type f -print | xargs rm -f
1407
1408
1409 # Packaging of the kernel to various formats
1410 # ---------------------------------------------------------------------------
1411 # rpm target kept for backward compatibility
1412 package-dir     := scripts/package
1413
1414 %src-pkg: FORCE
1415         $(Q)$(MAKE) $(build)=$(package-dir) $@
1416 %pkg: include/config/kernel.release FORCE
1417         $(Q)$(MAKE) $(build)=$(package-dir) $@
1418 rpm: rpm-pkg
1419         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1420         @echo "           Please use \"rpm-pkg\" instead."
1421
1422
1423 # Brief documentation of the typical targets used
1424 # ---------------------------------------------------------------------------
1425
1426 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1427 boards := $(sort $(notdir $(boards)))
1428 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1429 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1430
1431 PHONY += help
1432 help:
1433         @echo  'Cleaning targets:'
1434         @echo  '  clean           - Remove most generated files but keep the config and'
1435         @echo  '                    enough build support to build external modules'
1436         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1437         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1438         @echo  ''
1439         @echo  'Configuration targets:'
1440         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1441         @echo  ''
1442         @echo  'Other generic targets:'
1443         @echo  '  all             - Build all targets marked with [*]'
1444         @echo  '* vmlinux         - Build the bare kernel'
1445         @echo  '* modules         - Build all modules'
1446         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1447         @echo  '  dir/            - Build all files in dir and below'
1448         @echo  '  dir/file.[ois]  - Build specified target only'
1449         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1450         @echo  '                    (requires compiler support for LLVM assembly generation)'
1451         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1452         @echo  '                    (requires a recent binutils and recent build (System.map))'
1453         @echo  '  dir/file.ko     - Build module including final link'
1454         @echo  '  modules_prepare - Set up for building external modules'
1455         @echo  '  tags/TAGS       - Generate tags file for editors'
1456         @echo  '  cscope          - Generate cscope index'
1457         @echo  '  gtags           - Generate GNU GLOBAL index'
1458         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1459         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1460         @echo  '  image_name      - Output the image name (use with make -s)'
1461         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1462          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1463          echo  ''
1464         @echo  'Static analysers:'
1465         @echo  '  checkstack      - Generate a list of stack hogs'
1466         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1467         @echo  '  versioncheck    - Sanity check on version.h usage'
1468         @echo  '  includecheck    - Check for duplicate included header files'
1469         @echo  '  export_report   - List the usages of all exported symbols'
1470         @echo  '  headers_check   - Sanity check on exported headers'
1471         @echo  '  headerdep       - Detect inclusion cycles in headers'
1472         @echo  '  coccicheck      - Check with Coccinelle'
1473         @echo  ''
1474         @echo  'Kernel selftest:'
1475         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1476         @echo  '                    Build, install, and boot kernel before'
1477         @echo  '                    running kselftest on it'
1478         @echo  '  kselftest-clean - Remove all generated kselftest files'
1479         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1480         @echo  '                    .config.'
1481         @echo  ''
1482         @echo 'Userspace tools targets:'
1483         @echo '  use "make tools/help"'
1484         @echo '  or  "cd tools; make help"'
1485         @echo  ''
1486         @echo  'Kernel packaging:'
1487         @$(MAKE) $(build)=$(package-dir) help
1488         @echo  ''
1489         @echo  'Documentation targets:'
1490         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1491         @echo  ''
1492         @echo  'Architecture specific targets ($(SRCARCH)):'
1493         @$(if $(archhelp),$(archhelp),\
1494                 echo '  No architecture specific help defined for $(SRCARCH)')
1495         @echo  ''
1496         @$(if $(boards), \
1497                 $(foreach b, $(boards), \
1498                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1499                 echo '')
1500         @$(if $(board-dirs), \
1501                 $(foreach b, $(board-dirs), \
1502                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1503                 printf "  %-16s - Show all of the above\\n" help-boards; \
1504                 echo '')
1505
1506         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1507         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1508         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1509         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1510         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1511         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1512         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1513         @echo  '                1: warnings which may be relevant and do not occur too often'
1514         @echo  '                2: warnings which occur quite often but may still be relevant'
1515         @echo  '                3: more obscure warnings, can most likely be ignored'
1516         @echo  '                Multiple levels can be combined with W=12 or W=123'
1517         @echo  ''
1518         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1519         @echo  'For further info see the ./README file'
1520
1521
1522 help-board-dirs := $(addprefix help-,$(board-dirs))
1523
1524 help-boards: $(help-board-dirs)
1525
1526 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1527
1528 $(help-board-dirs): help-%:
1529         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1530         @$(if $(boards-per-dir), \
1531                 $(foreach b, $(boards-per-dir), \
1532                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1533                 echo '')
1534
1535
1536 # Documentation targets
1537 # ---------------------------------------------------------------------------
1538 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1539                linkcheckdocs dochelp refcheckdocs
1540 PHONY += $(DOC_TARGETS)
1541 $(DOC_TARGETS): scripts_basic FORCE
1542         $(Q)$(MAKE) $(build)=Documentation $@
1543
1544 else # KBUILD_EXTMOD
1545
1546 ###
1547 # External module support.
1548 # When building external modules the kernel used as basis is considered
1549 # read-only, and no consistency checks are made and the make
1550 # system is not used on the basis kernel. If updates are required
1551 # in the basis kernel ordinary make commands (without M=...) must
1552 # be used.
1553 #
1554 # The following are the only valid targets when building external
1555 # modules.
1556 # make M=dir clean     Delete all automatically generated files
1557 # make M=dir modules   Make all modules in specified dir
1558 # make M=dir           Same as 'make M=dir modules'
1559 # make M=dir modules_install
1560 #                      Install the modules built in the module directory
1561 #                      Assumes install directory is already created
1562
1563 # We are always building modules
1564 KBUILD_MODULES := 1
1565 PHONY += crmodverdir
1566 crmodverdir:
1567         $(cmd_crmodverdir)
1568
1569 PHONY += $(objtree)/Module.symvers
1570 $(objtree)/Module.symvers:
1571         @test -e $(objtree)/Module.symvers || ( \
1572         echo; \
1573         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1574         echo "           is missing; modules will have no dependencies and modversions."; \
1575         echo )
1576
1577 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1578 PHONY += $(module-dirs) modules
1579 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1580         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1581
1582 modules: $(module-dirs)
1583         @$(kecho) '  Building modules, stage 2.';
1584         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1585
1586 PHONY += modules_install
1587 modules_install: _emodinst_ _emodinst_post
1588
1589 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1590 PHONY += _emodinst_
1591 _emodinst_:
1592         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1593         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1594
1595 PHONY += _emodinst_post
1596 _emodinst_post: _emodinst_
1597         $(call cmd,depmod)
1598
1599 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1600
1601 PHONY += $(clean-dirs) clean
1602 $(clean-dirs):
1603         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1604
1605 clean:  rm-dirs := $(MODVERDIR)
1606 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1607
1608 PHONY += help
1609 help:
1610         @echo  '  Building external modules.'
1611         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1612         @echo  ''
1613         @echo  '  modules         - default target, build the module(s)'
1614         @echo  '  modules_install - install the module'
1615         @echo  '  clean           - remove generated files in module directory only'
1616         @echo  ''
1617
1618 # Dummies...
1619 PHONY += prepare scripts
1620 prepare: ;
1621 scripts: ;
1622 endif # KBUILD_EXTMOD
1623
1624 clean: $(clean-dirs)
1625         $(call cmd,rmdirs)
1626         $(call cmd,rmfiles)
1627         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1628                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1629                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1630                 -o -name '*.dwo' -o -name '*.lst' \
1631                 -o -name '*.su'  \
1632                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1633                 -o -name '*.symtypes' -o -name 'modules.order' \
1634                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1635                 -o -name .cache.mk \
1636                 -o -name '*.c.[012]*.*' \
1637                 -o -name '*.ll' \
1638                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1639
1640 # Generate tags for editors
1641 # ---------------------------------------------------------------------------
1642 quiet_cmd_tags = GEN     $@
1643       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1644
1645 tags TAGS cscope gtags: FORCE
1646         $(call cmd,tags)
1647
1648 # Scripts to check various things for consistency
1649 # ---------------------------------------------------------------------------
1650
1651 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1652
1653 includecheck:
1654         find $(srctree)/* $(RCS_FIND_IGNORE) \
1655                 -name '*.[hcS]' -type f -print | sort \
1656                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1657
1658 versioncheck:
1659         find $(srctree)/* $(RCS_FIND_IGNORE) \
1660                 -name '*.[hcS]' -type f -print | sort \
1661                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1662
1663 coccicheck:
1664         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1665
1666 namespacecheck:
1667         $(PERL) $(srctree)/scripts/namespace.pl
1668
1669 export_report:
1670         $(PERL) $(srctree)/scripts/export_report.pl
1671
1672 endif #ifeq ($(config-targets),1)
1673 endif #ifeq ($(mixed-targets),1)
1674
1675 PHONY += checkstack kernelrelease kernelversion image_name
1676
1677 # UML needs a little special treatment here.  It wants to use the host
1678 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1679 # else wants $(ARCH), including people doing cross-builds, which means
1680 # that $(SUBARCH) doesn't work here.
1681 ifeq ($(ARCH), um)
1682 CHECKSTACK_ARCH := $(SUBARCH)
1683 else
1684 CHECKSTACK_ARCH := $(ARCH)
1685 endif
1686 checkstack:
1687         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1688         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1689
1690 kernelrelease:
1691         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1692
1693 kernelversion:
1694         @echo $(KERNELVERSION)
1695
1696 image_name:
1697         @echo $(KBUILD_IMAGE)
1698
1699 # Clear a bunch of variables before executing the submake
1700 tools/: FORCE
1701         $(Q)mkdir -p $(objtree)/tools
1702         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1703
1704 tools/%: FORCE
1705         $(Q)mkdir -p $(objtree)/tools
1706         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1707
1708 # Single targets
1709 # ---------------------------------------------------------------------------
1710 # Single targets are compatible with:
1711 # - build with mixed source and output
1712 # - build with separate output dir 'make O=...'
1713 # - external modules
1714 #
1715 #  target-dir => where to store outputfile
1716 #  build-dir  => directory in kernel source tree to use
1717
1718 ifeq ($(KBUILD_EXTMOD),)
1719         build-dir  = $(patsubst %/,%,$(dir $@))
1720         target-dir = $(dir $@)
1721 else
1722         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1723         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1724         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1725 endif
1726
1727 %.s: %.c prepare scripts FORCE
1728         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1729 %.i: %.c prepare scripts FORCE
1730         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1731 %.o: %.c prepare scripts FORCE
1732         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1733 %.lst: %.c prepare scripts FORCE
1734         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1735 %.s: %.S prepare scripts FORCE
1736         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1737 %.o: %.S prepare scripts FORCE
1738         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1739 %.symtypes: %.c prepare scripts FORCE
1740         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1741 %.ll: %.c prepare scripts FORCE
1742         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1743
1744 # Modules
1745 /: prepare scripts FORCE
1746         $(cmd_crmodverdir)
1747         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1748         $(build)=$(build-dir)
1749 # Make sure the latest headers are built for Documentation
1750 Documentation/ samples/: headers_install
1751 %/: prepare scripts FORCE
1752         $(cmd_crmodverdir)
1753         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1754         $(build)=$(build-dir)
1755 %.ko: prepare scripts FORCE
1756         $(cmd_crmodverdir)
1757         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1758         $(build)=$(build-dir) $(@:.ko=.o)
1759         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1760
1761 # FIXME Should go into a make.lib or something
1762 # ===========================================================================
1763
1764 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1765       cmd_rmdirs = rm -rf $(rm-dirs)
1766
1767 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1768       cmd_rmfiles = rm -f $(rm-files)
1769
1770 # Run depmod only if we have System.map and depmod is executable
1771 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1772       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1773                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1774
1775 # Create temporary dir for module support files
1776 # clean it up only when building all modules
1777 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1778                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1779
1780 # read all saved command lines
1781
1782 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1783
1784 ifneq ($(cmd_files),)
1785   $(cmd_files): ;       # Do not try to update included dependency files
1786   include $(cmd_files)
1787 endif
1788
1789 endif   # skip-makefile
1790
1791 PHONY += FORCE
1792 FORCE:
1793
1794 # Declare the contents of the .PHONY variable as phony.  We keep that
1795 # information in a variable so we can use it in if_changed and friends.
1796 .PHONY: $(PHONY)