Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 4
   4 SUBLEVEL = 189
   5 EXTRAVERSION =
   6 NAME = Kleptomaniac Octopus
   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 # We are using a recursive build, so we need to do a little thinking
  19 # to get the ordering right.
  20 #
  21 # Most importantly: sub-Makefiles should only ever modify files in
  22 # their own directory. If in some directory we have a dependency on
  23 # a file in another dir (which doesn't happen often, but it's often
  24 # unavoidable when linking the built-in.a targets which finally
  25 # turn into vmlinux), we will call a sub make in that other dir, and
  26 # after that we are sure that everything which is in that other dir
  27 # is now up to date.
  28 #
  29 # The only cases where we need to modify files which have global
  30 # effects are thus separated out and done before the recursive
  31 # descending is started. They are now explicitly listed as the
  32 # prepare rule.
  33
  34 ifneq ($(sub_make_done),1)
  35
  36 # Do not use make's built-in rules and variables
  37 # (this increases performance and avoids hard-to-debug behaviour)
  38 MAKEFLAGS += -rR
  39
  40 # Avoid funny character set dependencies
  41 unexport LC_ALL
  42 LC_COLLATE=C
  43 LC_NUMERIC=C
  44 export LC_COLLATE LC_NUMERIC
  45
  46 # Avoid interference with shell env settings
  47 unexport GREP_OPTIONS
  48
  49 # Beautify output
  50 # ---------------------------------------------------------------------------
  51 #
  52 # Normally, we echo the whole command before executing it. By making
  53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  54 # $(quiet) to choose other forms of output instead, e.g.
  55 #
  56 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  57 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  58 #
  59 # If $(quiet) is empty, the whole command will be printed.
  60 # If it is set to "quiet_", only the short version will be printed.
  61 # If it is set to "silent_", nothing will be printed at all, since
  62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  63 #
  64 # A simple variant is to prefix commands with $(Q) - that's useful
  65 # for commands that shall be hidden in non-verbose mode.
  66 #
  67 #       $(Q)ln $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 #
  72 # To put more focus on warnings, be less verbose as default
  73 # Use 'make V=1' to see the full commands
  74
  75 ifeq ("$(origin V)", "command line")
  76   KBUILD_VERBOSE = $(V)
  77 endif
  78 ifndef KBUILD_VERBOSE
  79   KBUILD_VERBOSE = 0
  80 endif
  81
  82 ifeq ($(KBUILD_VERBOSE),1)
  83   quiet =
  84   Q =
  85 else
  86   quiet=quiet_
  87   Q = @
  88 endif
  89
  90 # If the user is running make -s (silent mode), suppress echoing of
  91 # commands
  92
  93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  94   quiet=silent_
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # Kbuild will save output files in the current working directory.
 100 # This does not need to match to the root of the kernel source tree.
 101 #
 102 # For example, you can do this:
 103 #
 104 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 105 #
 106 # If you want to save output files in a different location, there are
 107 # two syntaxes to specify it.
 108 #
 109 # 1) O=
 110 # Use "make O=dir/to/store/output/files/"
 111 #
 112 # 2) Set KBUILD_OUTPUT
 113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 115 #
 116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 117 # variable.
 118
 119 # Do we want to change the working directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 ifneq ($(KBUILD_OUTPUT),)
 125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 126 # expand a shell special character '~'. We use a somewhat tedious way here.
 127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 128 $(if $(abs_objtree),, \
 129      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 130
 131 # $(realpath ...) resolves symlinks
 132 abs_objtree := $(realpath $(abs_objtree))
 133 else
 134 abs_objtree := $(CURDIR)
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136
 137 ifeq ($(abs_objtree),$(CURDIR))
 138 # Suppress "Entering directory ..." unless we are changing the work directory.
 139 MAKEFLAGS += --no-print-directory
 140 else
 141 need-sub-make := 1
 142 endif
 143
 144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 145
 146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 147 $(error source directory cannot contain spaces or colons)
 148 endif
 149
 150 ifneq ($(abs_srctree),$(abs_objtree))
 151 # Look for make include files relative to root of kernel src
 152 #
 153 # This does not become effective immediately because MAKEFLAGS is re-parsed
 154 # once after the Makefile is read. We need to invoke sub-make.
 155 MAKEFLAGS += --include-dir=$(abs_srctree)
 156 need-sub-make := 1
 157 endif
 158
 159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 162 need-sub-make := 1
 163 # Cancel implicit rules for this Makefile.
 164 $(lastword $(MAKEFILE_LIST)): ;
 165 endif
 166
 167 export abs_srctree abs_objtree
 168 export sub_make_done := 1
 169
 170 ifeq ($(need-sub-make),1)
 171
 172 PHONY += $(MAKECMDGOALS) sub-make
 173
 174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 175         @:
 176
 177 # Invoke a second make in the output directory, passing relevant variables
 178 sub-make:
 179         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 180
 181 endif # need-sub-make
 182 endif # sub_make_done
 183
 184 # We process the rest of the Makefile if this is the final invocation of make
 185 ifeq ($(need-sub-make),)
 186
 187 # Do not print "Entering directory ...",
 188 # but we want to display it when entering to the output directory
 189 # so that IDEs/editors are able to understand relative filenames.
 190 MAKEFLAGS += --no-print-directory
 191
 192 # Call a source code checker (by default, "sparse") as part of the
 193 # C compilation.
 194 #
 195 # Use 'make C=1' to enable checking of only re-compiled files.
 196 # Use 'make C=2' to enable checking of *all* source files, regardless
 197 # of whether they are re-compiled or not.
 198 #
 199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 200 # including where to get the "sparse" utility.
 201
 202 ifeq ("$(origin C)", "command line")
 203   KBUILD_CHECKSRC = $(C)
 204 endif
 205 ifndef KBUILD_CHECKSRC
 206   KBUILD_CHECKSRC = 0
 207 endif
 208
 209 # Call message checker as part of the C compilation
 210 #
 211 # Use 'make D=1' to enable checking
 212 # Use 'make D=2' to create the message catalog
 213
 214 ifdef D
 215   ifeq ("$(origin D)", "command line")
 216     KBUILD_KMSG_CHECK = $(D)
 217   endif
 218 endif
 219 ifndef KBUILD_KMSG_CHECK
 220   KBUILD_KMSG_CHECK = 0
 221 endif
 222
 223 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 224 # directory of external module to build. Setting M= takes precedence.
 225 ifeq ("$(origin M)", "command line")
 226   KBUILD_EXTMOD := $(M)
 227 endif
 228
 229 export KBUILD_CHECKSRC KBUILD_EXTMOD
 230
 231 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
 232
 233 ifeq ($(abs_srctree),$(abs_objtree))
 234         # building in the source tree
 235         srctree := .
 236         building_out_of_srctree :=
 237 else
 238         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 239                 # building in a subdirectory of the source tree
 240                 srctree := ..
 241         else
 242                 srctree := $(abs_srctree)
 243         endif
 244         building_out_of_srctree := 1
 245 endif
 246
 247 ifneq ($(KBUILD_ABS_SRCTREE),)
 248 srctree := $(abs_srctree)
 249 endif
 250
 251 objtree         := .
 252 VPATH           := $(srctree)
 253
 254 export building_out_of_srctree srctree objtree VPATH
 255
 256 # To make sure we do not include .config for any of the *config targets
 257 # catch them early, and hand them over to scripts/kconfig/Makefile
 258 # It is allowed to specify more targets when calling make, including
 259 # mixing *config targets and build targets.
 260 # For example 'make oldconfig all'.
 261 # Detect when mixed targets is specified, and make a second invocation
 262 # of make so .config is not included in this case either (for *config).
 263
 264 version_h := include/generated/uapi/linux/version.h
 265 old_version_h := include/linux/version.h
 266
 267 clean-targets := %clean mrproper cleandocs
 268 no-dot-config-targets := $(clean-targets) \
 269                          cscope gtags TAGS tags help% %docs check% coccicheck \
 270                          $(version_h) headers headers_% archheaders archscripts \
 271                          %asm-generic kernelversion %src-pkg
 272 no-sync-config-targets := $(no-dot-config-targets) install %install \
 273                            kernelrelease
 274 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 275
 276 config-build    :=
 277 mixed-build     :=
 278 need-config     := 1
 279 may-sync-config := 1
 280 single-build    :=
 281
 282 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 283         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 284                 need-config :=
 285         endif
 286 endif
 287
 288 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 289         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 290                 may-sync-config :=
 291         endif
 292 endif
 293
 294 ifneq ($(KBUILD_EXTMOD),)
 295         may-sync-config :=
 296 endif
 297
 298 ifeq ($(KBUILD_EXTMOD),)
 299         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 300                 config-build := 1
 301                 ifneq ($(words $(MAKECMDGOALS)),1)
 302                         mixed-build := 1
 303                 endif
 304         endif
 305 endif
 306
 307 # We cannot build single targets and the others at the same time
 308 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 309         single-build := 1
 310         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 311                 mixed-build := 1
 312         endif
 313 endif
 314
 315 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 316 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 317         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 318                 mixed-build := 1
 319         endif
 320 endif
 321
 322 # install and modules_install need also be processed one by one
 323 ifneq ($(filter install,$(MAKECMDGOALS)),)
 324         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 325                 mixed-build := 1
 326         endif
 327 endif
 328
 329 ifdef mixed-build
 330 # ===========================================================================
 331 # We're called with mixed targets (*config and build targets).
 332 # Handle them one by one.
 333
 334 PHONY += $(MAKECMDGOALS) __build_one_by_one
 335
 336 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 337         @:
 338
 339 __build_one_by_one:
 340         $(Q)set -e; \
 341         for i in $(MAKECMDGOALS); do \
 342                 $(MAKE) -f $(srctree)/Makefile $$i; \
 343         done
 344
 345 else # !mixed-build
 346
 347 include scripts/Kbuild.include
 348
 349 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 350 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 351 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 352 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 353
 354 include scripts/subarch.include
 355
 356 # Cross compiling and selecting different set of gcc/bin-utils
 357 # ---------------------------------------------------------------------------
 358 #
 359 # When performing cross compilation for other architectures ARCH shall be set
 360 # to the target architecture. (See arch/* for the possibilities).
 361 # ARCH can be set during invocation of make:
 362 # make ARCH=ia64
 363 # Another way is to have ARCH set in the environment.
 364 # The default ARCH is the host where make is executed.
 365
 366 # CROSS_COMPILE specify the prefix used for all executables used
 367 # during compilation. Only gcc and related bin-utils executables
 368 # are prefixed with $(CROSS_COMPILE).
 369 # CROSS_COMPILE can be set on the command line
 370 # make CROSS_COMPILE=ia64-linux-
 371 # Alternatively CROSS_COMPILE can be set in the environment.
 372 # Default value for CROSS_COMPILE is not to prefix executables
 373 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 374 ARCH            ?= $(SUBARCH)
 375
 376 # Architecture as present in compile.h
 377 UTS_MACHINE     := $(ARCH)
 378 SRCARCH         := $(ARCH)
 379
 380 # Additional ARCH settings for x86
 381 ifeq ($(ARCH),i386)
 382         SRCARCH := x86
 383 endif
 384 ifeq ($(ARCH),x86_64)
 385         SRCARCH := x86
 386 endif
 387
 388 # Additional ARCH settings for sparc
 389 ifeq ($(ARCH),sparc32)
 390        SRCARCH := sparc
 391 endif
 392 ifeq ($(ARCH),sparc64)
 393        SRCARCH := sparc
 394 endif
 395
 396 # Additional ARCH settings for sh
 397 ifeq ($(ARCH),sh64)
 398        SRCARCH := sh
 399 endif
 400
 401 KCONFIG_CONFIG  ?= .config
 402 export KCONFIG_CONFIG
 403
 404 # SHELL used by kbuild
 405 CONFIG_SHELL := sh
 406
 407 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 408 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 409 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 410
 411 ifneq ($(LLVM),)
 412 HOSTCC  = clang
 413 HOSTCXX = clang++
 414 else
 415 HOSTCC  = gcc
 416 HOSTCXX = g++
 417 endif
 418 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 419                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 420                 $(HOSTCFLAGS)
 421 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 422 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 423 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 424
 425 # Make variables (CC, etc...)
 426 CPP             = $(CC) -E
 427 ifneq ($(LLVM),)
 428 CC              = clang
 429 LD              = ld.lld
 430 AR              = llvm-ar
 431 NM              = llvm-nm
 432 OBJCOPY         = llvm-objcopy
 433 OBJDUMP         = llvm-objdump
 434 READELF         = llvm-readelf
 435 OBJSIZE         = llvm-size
 436 STRIP           = llvm-strip
 437 else
 438 CC              = $(CROSS_COMPILE)gcc
 439 LD              = $(CROSS_COMPILE)ld
 440 AR              = $(CROSS_COMPILE)ar
 441 NM              = $(CROSS_COMPILE)nm
 442 OBJCOPY         = $(CROSS_COMPILE)objcopy
 443 OBJDUMP         = $(CROSS_COMPILE)objdump
 444 READELF         = $(CROSS_COMPILE)readelf
 445 OBJSIZE         = $(CROSS_COMPILE)size
 446 STRIP           = $(CROSS_COMPILE)strip
 447 endif
 448 PAHOLE          = pahole
 449 LEX             = flex
 450 YACC            = bison
 451 AWK             = awk
 452 INSTALLKERNEL  := installkernel
 453 DEPMOD          = depmod
 454 PERL            = perl
 455 PYTHON          = python
 456 PYTHON3         = python3
 457 CHECK           = sparse
 458 BASH            = bash
 459 KGZIP           = gzip
 460 KBZIP2          = bzip2
 461 KLZOP           = lzop
 462 LZMA            = lzma
 463 LZ4             = lz4c
 464 XZ              = xz
 465
 466 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 467                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 468 KMSG_CHECK      = $(srctree)/scripts/kmsg-doc
 469 NOSTDINC_FLAGS :=
 470 CFLAGS_MODULE   =
 471 AFLAGS_MODULE   =
 472 LDFLAGS_MODULE  =
 473 CFLAGS_KERNEL   =
 474 AFLAGS_KERNEL   =
 475 LDFLAGS_vmlinux =
 476
 477 # Prefer linux-backports-modules
 478 ifneq ($(KBUILD_SRC),)
 479 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
 480 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
 481 endif
 482 endif
 483
 484 # Use USERINCLUDE when you must reference the UAPI directories only.
 485 USERINCLUDE    := \
 486                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 487                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 488                 -I$(srctree)/include/uapi \
 489                 -I$(objtree)/include/generated/uapi \
 490                 -include $(srctree)/include/linux/kconfig.h
 491
 492 # Use LINUXINCLUDE when you must reference the include/ directory.
 493 # Needed to be compatible with the O= option
 494 LINUXINCLUDE    := \
 495                 $(UBUNTUINCLUDE) \
 496                 -I$(srctree)/arch/$(SRCARCH)/include \
 497                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 498                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 499                 -I$(objtree)/include \
 500                 $(USERINCLUDE)
 501
 502 # UBUNTU: Include our third party driver stuff too
 503 LINUXINCLUDE   += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
 504
 505 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 506 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 507                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 508                    -Werror=implicit-function-declaration -Werror=implicit-int \
 509                    -Werror=return-type -Wno-format-security \
 510                    -std=gnu89
 511 KBUILD_CPPFLAGS := -D__KERNEL__
 512 KBUILD_AFLAGS_KERNEL :=
 513 KBUILD_CFLAGS_KERNEL :=
 514 KBUILD_AFLAGS_MODULE  := -DMODULE
 515 KBUILD_CFLAGS_MODULE  := -DMODULE
 516 KBUILD_LDFLAGS_MODULE :=
 517 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 518 KBUILD_LDFLAGS :=
 519 GCC_PLUGINS_CFLAGS :=
 520 CLANG_FLAGS :=
 521
 522 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
 523 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
 524 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 525 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ
 526 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 527
 528 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 529 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 530 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 531 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 532 export KBUILD_KMSG_CHECK KMSG_CHECK
 533 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 534 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 535
 536 # Files to ignore in find ... statements
 537
 538 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 539                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 540                           -prune -o
 541 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 542                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 543
 544 # ===========================================================================
 545 # Rules shared between *config targets and build targets
 546
 547 # Basic helpers built in scripts/basic/
 548 PHONY += scripts_basic
 549 scripts_basic:
 550         $(Q)$(MAKE) $(build)=scripts/basic
 551         $(Q)rm -f .tmp_quiet_recordmcount
 552
 553 PHONY += outputmakefile
 554 # Before starting out-of-tree build, make sure the source tree is clean.
 555 # outputmakefile generates a Makefile in the output directory, if using a
 556 # separate output directory. This allows convenient use of make in the
 557 # output directory.
 558 # At the same time when output Makefile generated, generate .gitignore to
 559 # ignore whole output directory
 560 outputmakefile:
 561 ifdef building_out_of_srctree
 562         $(Q)if [ -f $(srctree)/.config -o \
 563                  -d $(srctree)/include/config -o \
 564                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 565                 echo >&2 "***"; \
 566                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 567                 echo >&2 "*** in $(abs_srctree)";\
 568                 echo >&2 "***"; \
 569                 false; \
 570         fi
 571         $(Q)ln -fsn $(srctree) source
 572         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 573         $(Q)test -e .gitignore || \
 574         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 575 endif
 576
 577 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 578 ifneq ($(CROSS_COMPILE),)
 579 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 580 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 581 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
 582 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 583 endif
 584 ifneq ($(GCC_TOOLCHAIN),)
 585 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 586 endif
 587 ifneq ($(LLVM_IAS),1)
 588 CLANG_FLAGS     += -no-integrated-as
 589 endif
 590 CLANG_FLAGS     += -Werror=unknown-warning-option
 591 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 592 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 593 export CLANG_FLAGS
 594 endif
 595
 596 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 597 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 598 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 599 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 600 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 601
 602 ifdef config-build
 603 # ===========================================================================
 604 # *config targets only - make sure prerequisites are updated, and descend
 605 # in scripts/kconfig to make the *config target
 606
 607 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 608 # KBUILD_DEFCONFIG may point out an alternative default configuration
 609 # used for 'make defconfig'
 610 include arch/$(SRCARCH)/Makefile
 611 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 612
 613 config: outputmakefile scripts_basic FORCE
 614         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 615
 616 %config: outputmakefile scripts_basic FORCE
 617         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 618
 619 else #!config-build
 620 # ===========================================================================
 621 # Build targets only - this includes vmlinux, arch specific targets, clean
 622 # targets and others. In general all targets except *config targets.
 623
 624 # If building an external module we do not care about the all: rule
 625 # but instead _all depend on modules
 626 PHONY += all
 627 ifeq ($(KBUILD_EXTMOD),)
 628 _all: all
 629 else
 630 _all: modules
 631 endif
 632
 633 # Decide whether to build built-in, modular, or both.
 634 # Normally, just do built-in.
 635
 636 KBUILD_MODULES :=
 637 KBUILD_BUILTIN := 1
 638
 639 # If we have only "make modules", don't compile built-in objects.
 640 ifeq ($(MAKECMDGOALS),modules)
 641   KBUILD_BUILTIN :=
 642 endif
 643
 644 # If we have "make <whatever> modules", compile modules
 645 # in addition to whatever we do anyway.
 646 # Just "make" or "make all" shall build modules as well
 647
 648 ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
 649   KBUILD_MODULES := 1
 650 endif
 651
 652 ifeq ($(MAKECMDGOALS),)
 653   KBUILD_MODULES := 1
 654 endif
 655
 656 export KBUILD_MODULES KBUILD_BUILTIN
 657
 658 ifdef need-config
 659 include include/config/auto.conf
 660 endif
 661
 662 ifeq ($(KBUILD_EXTMOD),)
 663 # Objects we will link into vmlinux / subdirs we need to visit
 664 init-y          := init/
 665 drivers-y       := drivers/ sound/ ubuntu/
 666 drivers-$(CONFIG_SAMPLES) += samples/
 667 net-y           := net/
 668 libs-y          := lib/
 669 core-y          := usr/
 670 virt-y          := virt/
 671 endif # KBUILD_EXTMOD
 672
 673 # The all: target is the default when no target is given on the
 674 # command line.
 675 # This allow a user to issue only 'make' to build a kernel including modules
 676 # Defaults to vmlinux, but the arch makefile usually adds further targets
 677 all: vmlinux
 678
 679 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 680         $(call cc-option,-fno-tree-loop-im) \
 681         $(call cc-disable-warning,maybe-uninitialized,)
 682 export CFLAGS_GCOV
 683
 684 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 685 ifdef CONFIG_FUNCTION_TRACER
 686   CC_FLAGS_FTRACE := -pg
 687 endif
 688
 689 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 690 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 691 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 692 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 693 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 694 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 695 export RETPOLINE_CFLAGS
 696 export RETPOLINE_VDSO_CFLAGS
 697
 698 include arch/$(SRCARCH)/Makefile
 699
 700 ifdef need-config
 701 ifdef may-sync-config
 702 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 703 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 704 # because some architectures define CROSS_COMPILE there.
 705 include include/config/auto.conf.cmd
 706
 707 $(KCONFIG_CONFIG):
 708         @echo >&2 '***'
 709         @echo >&2 '*** Configuration file "$@" not found!'
 710         @echo >&2 '***'
 711         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 712         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 713         @echo >&2 '***'
 714         @/bin/false
 715
 716 # The actual configuration files used during the build are stored in
 717 # include/generated/ and include/config/. Update them if .config is newer than
 718 # include/config/auto.conf (which mirrors .config).
 719 #
 720 # This exploits the 'multi-target pattern rule' trick.
 721 # The syncconfig should be executed only once to make all the targets.
 722 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 723         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 724 else # !may-sync-config
 725 # External modules and some install targets need include/generated/autoconf.h
 726 # and include/config/auto.conf but do not care if they are up-to-date.
 727 # Use auto.conf to trigger the test
 728 PHONY += include/config/auto.conf
 729
 730 include/config/auto.conf:
 731         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 732         echo >&2;                                                       \
 733         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 734         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 735         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 736         echo >&2 ;                                                      \
 737         /bin/false)
 738
 739 endif # may-sync-config
 740 endif # need-config
 741
 742 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 743 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 744 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 745 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 746 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 747
 748 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 749 KBUILD_CFLAGS += -O2
 750 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 751 KBUILD_CFLAGS += -O3
 752 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 753 KBUILD_CFLAGS += -Os
 754 endif
 755
 756 # Tell gcc to never replace conditional load with a non-conditional one
 757 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 758 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 759
 760 include scripts/Makefile.kcov
 761 include scripts/Makefile.gcc-plugins
 762
 763 ifdef CONFIG_READABLE_ASM
 764 # Disable optimizations that make assembler listings hard to read.
 765 # reorder blocks reorders the control in the function
 766 # ipa clone creates specialized cloned functions
 767 # partial inlining inlines only parts of functions
 768 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 769                  $(call cc-option,-fno-ipa-cp-clone,) \
 770                  $(call cc-option,-fno-partial-inlining)
 771 endif
 772
 773 ifneq ($(CONFIG_FRAME_WARN),0)
 774 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 775 endif
 776
 777 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 778 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 779 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 780
 781 KBUILD_CFLAGS += $(stackp-flags-y)
 782
 783 ifdef CONFIG_CC_IS_CLANG
 784 KBUILD_CPPFLAGS += -Qunused-arguments
 785 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 786 KBUILD_CFLAGS += -Wno-gnu
 787 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 788 KBUILD_CFLAGS += -Wno-tautological-compare
 789 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 790 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 791 # See modpost pattern 2
 792 KBUILD_CFLAGS += -mno-global-merge
 793 else
 794
 795 # Warn about unmarked fall-throughs in switch statement.
 796 # Disabled for clang while comment to attribute conversion happens and
 797 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 798 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 799 endif
 800
 801 # These warnings generated too much noise in a regular build.
 802 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 803 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 804
 805 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 806 ifdef CONFIG_FRAME_POINTER
 807 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 808 else
 809 # Some targets (ARM with Thumb2, for example), can't be built with frame
 810 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 811 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 812 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 813 # -fomit-frame-pointer with FUNCTION_TRACER.
 814 ifndef CONFIG_FUNCTION_TRACER
 815 KBUILD_CFLAGS   += -fomit-frame-pointer
 816 endif
 817 endif
 818
 819 # Initialize all stack variables with a pattern, if desired.
 820 ifdef CONFIG_INIT_STACK_ALL
 821 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 822 endif
 823
 824 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 825
 826 ifdef CONFIG_DEBUG_INFO
 827 ifdef CONFIG_DEBUG_INFO_SPLIT
 828 DEBUG_CFLAGS    += -gsplit-dwarf
 829 else
 830 DEBUG_CFLAGS    += -g
 831 endif
 832 ifneq ($(LLVM_IAS),1)
 833 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 834 endif
 835 endif
 836
 837 ifdef CONFIG_DEBUG_INFO_DWARF4
 838 DEBUG_CFLAGS    += -gdwarf-4
 839 endif
 840
 841 ifdef CONFIG_DEBUG_INFO_REDUCED
 842 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 843                    $(call cc-option,-fno-var-tracking)
 844 endif
 845
 846 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 847 export DEBUG_CFLAGS
 848
 849 ifdef CONFIG_FUNCTION_TRACER
 850 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 851   # gcc 5 supports generating the mcount tables directly
 852   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 853     CC_FLAGS_FTRACE     += -mrecord-mcount
 854     export CC_USING_RECORD_MCOUNT := 1
 855   endif
 856   ifdef CONFIG_HAVE_NOP_MCOUNT
 857     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 858       CC_FLAGS_FTRACE   += -mnop-mcount
 859       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 860     endif
 861   endif
 862 endif
 863 ifdef CONFIG_HAVE_FENTRY
 864   ifeq ($(call cc-option-yn, -mfentry),y)
 865     CC_FLAGS_FTRACE     += -mfentry
 866     CC_FLAGS_USING      += -DCC_USING_FENTRY
 867   endif
 868 endif
 869 export CC_FLAGS_FTRACE
 870 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 871 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 872 ifdef CONFIG_DYNAMIC_FTRACE
 873         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 874                 BUILD_C_RECORDMCOUNT := y
 875                 export BUILD_C_RECORDMCOUNT
 876         endif
 877 endif
 878 endif
 879
 880 # We trigger additional mismatches with less inlining
 881 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 882 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 883 endif
 884
 885 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 886 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 887 LDFLAGS_vmlinux += --gc-sections
 888 endif
 889
 890 ifdef CONFIG_LIVEPATCH
 891 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 892 endif
 893
 894 # arch Makefile may override CC so keep this after arch Makefile is included
 895 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 896
 897 # warn about C99 declaration after statement
 898 KBUILD_CFLAGS += -Wdeclaration-after-statement
 899
 900 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 901 KBUILD_CFLAGS += -Wvla
 902
 903 # disable pointer signed / unsigned warnings in gcc 4.0
 904 KBUILD_CFLAGS += -Wno-pointer-sign
 905
 906 # disable stringop warnings in gcc 8+
 907 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 908
 909 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 910 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 911 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 912 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 913
 914 # Another good warning that we'll want to enable eventually
 915 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 916
 917 # Enabled with W=2, disabled by default as noisy
 918 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 919
 920 # disable invalid "can't wrap" optimizations for signed / pointers
 921 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 922
 923 # clang sets -fmerge-all-constants by default as optimization, but this
 924 # is non-conforming behavior for C and in fact breaks the kernel, so we
 925 # need to disable it here generally.
 926 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 927
 928 # for gcc -fno-merge-all-constants disables everything, but it is fine
 929 # to have actual conforming behavior enabled.
 930 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 931
 932 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 933 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 934
 935 # conserve stack if available
 936 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 937
 938 # Prohibit date/time macros, which would make the build non-deterministic
 939 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 940
 941 # enforce correct pointer usage
 942 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 943
 944 # Require designated initializers for all marked structures
 945 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 946
 947 # change __FILE__ to the relative path from the srctree
 948 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 949
 950 include scripts/Makefile.kasan
 951 include scripts/Makefile.extrawarn
 952 include scripts/Makefile.ubsan
 953
 954 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 955 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 956 KBUILD_AFLAGS   += $(KAFLAGS)
 957 KBUILD_CFLAGS   += $(KCFLAGS)
 958
 959 KBUILD_LDFLAGS_MODULE += --build-id
 960 LDFLAGS_vmlinux += --build-id
 961
 962 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 963 LDFLAGS_vmlinux += $(call ld-option, -X,)
 964 endif
 965
 966 ifeq ($(CONFIG_RELR),y)
 967 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
 968 endif
 969
 970 # make the checker run with the right architecture
 971 CHECKFLAGS += --arch=$(ARCH)
 972
 973 # insure the checker run with the right endianness
 974 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 975
 976 # the checker needs the correct machine size
 977 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 978
 979 # Default kernel image to build when no specific target is given.
 980 # KBUILD_IMAGE may be overruled on the command line or
 981 # set in the environment
 982 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 983 # this default value
 984 export KBUILD_IMAGE ?= vmlinux
 985
 986 #
 987 # INSTALL_PATH specifies where to place the updated kernel and system map
 988 # images. Default is /boot, but you can set it to other values
 989 export  INSTALL_PATH ?= /boot
 990
 991 #
 992 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 993 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 994 # an argument if needed. Otherwise it defaults to the kernel install path
 995 #
 996 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 997
 998 #
 999 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1000 # relocations required by build roots.  This is not defined in the
1001 # makefile but the argument can be passed to make if needed.
1002 #
1003
1004 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1005 export MODLIB
1006
1007 #
1008 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1009 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
1010 # the default option --strip-debug will be used.  Otherwise,
1011 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1012
1013 ifdef INSTALL_MOD_STRIP
1014 ifeq ($(INSTALL_MOD_STRIP),1)
1015 mod_strip_cmd = $(STRIP) --strip-debug
1016 else
1017 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1018 endif # INSTALL_MOD_STRIP=1
1019 else
1020 mod_strip_cmd = true
1021 endif # INSTALL_MOD_STRIP
1022 export mod_strip_cmd
1023
1024 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1025 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1026 # or CONFIG_MODULE_COMPRESS_XZ.
1027
1028 mod_compress_cmd = true
1029 ifdef CONFIG_MODULE_COMPRESS
1030   ifdef CONFIG_MODULE_COMPRESS_GZIP
1031     mod_compress_cmd = $(KGZIP) -n -f
1032   endif # CONFIG_MODULE_COMPRESS_GZIP
1033   ifdef CONFIG_MODULE_COMPRESS_XZ
1034     mod_compress_cmd = $(XZ) -f
1035   endif # CONFIG_MODULE_COMPRESS_XZ
1036 endif # CONFIG_MODULE_COMPRESS
1037 export mod_compress_cmd
1038
1039 ifdef CONFIG_MODULE_SIG_ALL
1040 $(eval $(call config_filename,MODULE_SIG_KEY))
1041
1042 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1043 else
1044 mod_sign_cmd = true
1045 endif
1046 export mod_sign_cmd
1047
1048 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1049
1050 ifdef CONFIG_STACK_VALIDATION
1051   has_libelf := $(call try-run,\
1052                 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1053   ifeq ($(has_libelf),1)
1054     objtool_target := tools/objtool FORCE
1055   else
1056     SKIP_STACK_VALIDATION := 1
1057     export SKIP_STACK_VALIDATION
1058   endif
1059 endif
1060
1061 PHONY += prepare0
1062
1063 export MODORDER := $(extmod-prefix)modules.order
1064
1065 ifeq ($(KBUILD_EXTMOD),)
1066 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1067
1068 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1069                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1070                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1071
1072 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1073                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1074                         $(drivers-) $(net-) $(libs-) $(virt-))))
1075
1076 build-dirs      := $(vmlinux-dirs)
1077 clean-dirs      := $(vmlinux-alldirs)
1078
1079 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1080 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1081 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1082 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1083 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1084 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1085 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1086
1087 # Externally visible symbols (used by link-vmlinux.sh)
1088 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1089                               $(drivers-y) $(net-y) $(virt-y)
1090 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1091 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1092 export LDFLAGS_vmlinux
1093 # used by scripts/Makefile.package
1094 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1095
1096 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1097
1098 # Recurse until adjust_autoksyms.sh is satisfied
1099 PHONY += autoksyms_recursive
1100 ifdef CONFIG_TRIM_UNUSED_KSYMS
1101 autoksyms_recursive: descend modules.order
1102         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1103           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1104 endif
1105
1106 # For the kernel to actually contain only the needed exported symbols,
1107 # we have to build modules as well to determine what those symbols are.
1108 # (this can be evaluated only once include/config/auto.conf has been included)
1109 ifdef CONFIG_TRIM_UNUSED_KSYMS
1110   KBUILD_MODULES := 1
1111 endif
1112
1113 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1114
1115 $(autoksyms_h):
1116         $(Q)mkdir -p $(dir $@)
1117         $(Q)touch $@
1118
1119 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1120
1121 # Final link of vmlinux with optional arch pass after final link
1122 cmd_link-vmlinux =                                                 \
1123         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1124         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1125
1126 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1127         +$(call if_changed,link-vmlinux)
1128
1129 targets := vmlinux
1130
1131 # The actual objects are generated when descending,
1132 # make sure no implicit rule kicks in
1133 $(sort $(vmlinux-deps)): descend ;
1134
1135 filechk_kernel.release = \
1136         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1137
1138 # Store (new) KERNELRELEASE string in include/config/kernel.release
1139 include/config/kernel.release: FORCE
1140         $(call filechk,kernel.release)
1141
1142 # Additional helpers built in scripts/
1143 # Carefully list dependencies so we do not try to build scripts twice
1144 # in parallel
1145 PHONY += scripts
1146 scripts: scripts_basic scripts_dtc
1147         $(Q)$(MAKE) $(build)=$(@)
1148
1149 # Things we need to do before we recursively start building the kernel
1150 # or the modules are listed in "prepare".
1151 # A multi level approach is used. prepareN is processed before prepareN-1.
1152 # archprepare is used in arch Makefiles and when processed asm symlink,
1153 # version.h and scripts_basic is processed / created.
1154
1155 PHONY += prepare archprepare
1156
1157 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1158         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1159
1160 prepare0: archprepare
1161         $(Q)$(MAKE) $(build)=scripts/mod
1162         $(Q)$(MAKE) $(build)=.
1163
1164 # All the preparing..
1165 prepare: prepare0 prepare-objtool
1166
1167 # Support for using generic headers in asm-generic
1168 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1169
1170 PHONY += asm-generic uapi-asm-generic
1171 asm-generic: uapi-asm-generic
1172         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1173         generic=include/asm-generic
1174 uapi-asm-generic:
1175         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1176         generic=include/uapi/asm-generic
1177
1178 PHONY += prepare-objtool
1179 prepare-objtool: $(objtool_target)
1180 ifeq ($(SKIP_STACK_VALIDATION),1)
1181 ifdef CONFIG_UNWINDER_ORC
1182         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1183         @false
1184 else
1185         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1186 endif
1187 endif
1188
1189 # Generate some files
1190 # ---------------------------------------------------------------------------
1191
1192 # KERNELRELEASE can change from a few different places, meaning version.h
1193 # needs to be updated, so this check is forced on all builds
1194
1195 uts_len := 64
1196 define filechk_utsrelease.h
1197         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1198           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1199           exit 1;                                                         \
1200         fi;                                                               \
1201         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1202 endef
1203
1204 define filechk_version.h
1205         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1206                 echo \#define LINUX_VERSION_CODE $(shell                 \
1207                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1208         else                                                             \
1209                 echo \#define LINUX_VERSION_CODE $(shell                 \
1210                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1211         fi;                                                              \
1212         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1213         ((c) > 255 ? 255 : (c)))'
1214 endef
1215
1216 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1217 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1218 $(version_h): FORCE
1219         $(call filechk,version.h)
1220         $(Q)rm -f $(old_version_h)
1221
1222 include/generated/utsrelease.h: include/config/kernel.release FORCE
1223         $(call filechk,utsrelease.h)
1224
1225 PHONY += headerdep
1226 headerdep:
1227         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1228         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1229
1230 # ---------------------------------------------------------------------------
1231 # Kernel headers
1232
1233 #Default location for installed headers
1234 export INSTALL_HDR_PATH = $(objtree)/usr
1235
1236 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1237       cmd_headers_install = \
1238         mkdir -p $(INSTALL_HDR_PATH); \
1239         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1240         usr/include $(INSTALL_HDR_PATH)
1241
1242 PHONY += headers_install
1243 headers_install: headers
1244         $(call cmd,headers_install)
1245
1246 PHONY += archheaders archscripts
1247
1248 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1249
1250 PHONY += headers
1251 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1252         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1253           $(error Headers not exportable for the $(SRCARCH) architecture))
1254         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1255         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1256         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1257
1258 # Deprecated. It is no-op now.
1259 PHONY += headers_check
1260 headers_check:
1261         @:
1262
1263 ifdef CONFIG_HEADERS_INSTALL
1264 prepare: headers
1265 endif
1266
1267 PHONY += scripts_unifdef
1268 scripts_unifdef: scripts_basic
1269         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1270
1271 # ---------------------------------------------------------------------------
1272 # Kernel selftest
1273
1274 PHONY += kselftest
1275 kselftest:
1276         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1277
1278 kselftest-%: FORCE
1279         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1280
1281 PHONY += kselftest-merge
1282 kselftest-merge:
1283         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1284         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1285                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1286         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1287
1288 # ---------------------------------------------------------------------------
1289 # Devicetree files
1290
1291 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1292 dtstree := arch/$(SRCARCH)/boot/dts
1293 endif
1294
1295 ifneq ($(dtstree),)
1296
1297 %.dtb: include/config/kernel.release scripts_dtc
1298         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1299
1300 PHONY += dtbs dtbs_install dtbs_check
1301 dtbs: include/config/kernel.release scripts_dtc
1302         $(Q)$(MAKE) $(build)=$(dtstree)
1303
1304 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1305 dtbs: dt_binding_check
1306 endif
1307
1308 dtbs_check: export CHECK_DTBS=1
1309 dtbs_check: dtbs
1310
1311 dtbs_install:
1312         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1313
1314 ifdef CONFIG_OF_EARLY_FLATTREE
1315 all: dtbs
1316 endif
1317
1318 endif
1319
1320 PHONY += scripts_dtc
1321 scripts_dtc: scripts_basic
1322         $(Q)$(MAKE) $(build)=scripts/dtc
1323
1324 PHONY += dt_binding_check
1325 dt_binding_check: scripts_dtc
1326         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1327
1328 # ---------------------------------------------------------------------------
1329 # Modules
1330
1331 ifdef CONFIG_MODULES
1332
1333 # By default, build modules as well
1334
1335 all: modules
1336
1337 # When we're building modules with modversions, we need to consider
1338 # the built-in objects during the descend as well, in order to
1339 # make sure the checksums are up to date before we record them.
1340 ifdef CONFIG_MODVERSIONS
1341   KBUILD_BUILTIN := 1
1342 endif
1343
1344 # Build modules
1345 #
1346 # A module can be listed more than once in obj-m resulting in
1347 # duplicate lines in modules.order files.  Those are removed
1348 # using awk while concatenating to the final file.
1349
1350 PHONY += modules
1351 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1352         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1353         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1354
1355 modules.order: descend
1356         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1357
1358 modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
1359
1360 modules.builtin: $(modbuiltin-dirs)
1361         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1362
1363 PHONY += $(modbuiltin-dirs)
1364 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1365 # here to make it self-healing in case somebody accidentally removes it.
1366 $(modbuiltin-dirs): include/config/tristate.conf
1367         $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1368
1369 # Target to prepare building external modules
1370 PHONY += modules_prepare
1371 modules_prepare: prepare
1372
1373 # Target to install modules
1374 PHONY += modules_install
1375 modules_install: _modinst_ _modinst_post
1376
1377 PHONY += _modinst_
1378 _modinst_:
1379         @rm -rf $(MODLIB)/kernel
1380         @rm -f $(MODLIB)/source
1381         @mkdir -p $(MODLIB)/kernel
1382         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1383         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1384                 rm -f $(MODLIB)/build ; \
1385                 ln -s $(CURDIR) $(MODLIB)/build ; \
1386         fi
1387         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1388         @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1389         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1390         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1391
1392 # This depmod is only for convenience to give the initial
1393 # boot a modules.dep even before / is mounted read-write.  However the
1394 # boot script depmod is the master version.
1395 PHONY += _modinst_post
1396 _modinst_post: _modinst_
1397         $(call cmd,depmod)
1398
1399 ifeq ($(CONFIG_MODULE_SIG), y)
1400 PHONY += modules_sign
1401 modules_sign:
1402         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1403 endif
1404
1405 else # CONFIG_MODULES
1406
1407 # Modules not configured
1408 # ---------------------------------------------------------------------------
1409
1410 PHONY += modules modules_install
1411 modules modules_install:
1412         @echo >&2
1413         @echo >&2 "The present kernel configuration has modules disabled."
1414         @echo >&2 "Type 'make config' and enable loadable module support."
1415         @echo >&2 "Then build a kernel with module support enabled."
1416         @echo >&2
1417         @exit 1
1418
1419 endif # CONFIG_MODULES
1420
1421 ###
1422 # Cleaning is done on three levels.
1423 # make clean     Delete most generated files
1424 #                Leave enough to build external modules
1425 # make mrproper  Delete the current configuration, and all generated files
1426 # make distclean Remove editor backup files, patch leftover files and the like
1427
1428 # Directories & files removed with 'make clean'
1429 CLEAN_DIRS  += include/ksym
1430 CLEAN_FILES += modules.builtin.modinfo
1431
1432 # Directories & files removed with 'make mrproper'
1433 MRPROPER_DIRS  += include/config include/generated          \
1434                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1435                   debian/ snap/ tar-install/
1436 MRPROPER_FILES += .config .config.old .version \
1437                   Module.symvers \
1438                   signing_key.pem signing_key.priv signing_key.x509     \
1439                   x509.genkey extra_certificates signing_key.x509.keyid \
1440                   signing_key.x509.signer vmlinux-gdb.py \
1441                   *.spec
1442
1443 # Directories & files removed with 'make distclean'
1444 DISTCLEAN_DIRS  +=
1445 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1446
1447 # clean - Delete most, but leave enough to build external modules
1448 #
1449 clean: rm-dirs  := $(CLEAN_DIRS)
1450 clean: rm-files := $(CLEAN_FILES)
1451
1452 PHONY += archclean vmlinuxclean
1453
1454 vmlinuxclean:
1455         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1456         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1457
1458 clean: archclean vmlinuxclean
1459
1460 # mrproper - Delete all generated files, including .config
1461 #
1462 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1463 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1464 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1465
1466 PHONY += $(mrproper-dirs) mrproper
1467 $(mrproper-dirs):
1468         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1469
1470 mrproper: clean $(mrproper-dirs)
1471         $(call cmd,rmdirs)
1472         $(call cmd,rmfiles)
1473
1474 # distclean
1475 #
1476 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1477 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1478
1479 PHONY += distclean
1480
1481 distclean: mrproper
1482         $(call cmd,rmdirs)
1483         $(call cmd,rmfiles)
1484         @find $(srctree) $(RCS_FIND_IGNORE) \
1485                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1486                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1487                 -o -name 'core' \) \
1488                 -type f -print | xargs rm -f
1489
1490
1491 # Packaging of the kernel to various formats
1492 # ---------------------------------------------------------------------------
1493
1494 %src-pkg: FORCE
1495         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1496 %pkg: include/config/kernel.release FORCE
1497         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1498
1499 # Brief documentation of the typical targets used
1500 # ---------------------------------------------------------------------------
1501
1502 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1503 boards := $(sort $(notdir $(boards)))
1504 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1505 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1506
1507 PHONY += help
1508 help:
1509         @echo  'Cleaning targets:'
1510         @echo  '  clean           - Remove most generated files but keep the config and'
1511         @echo  '                    enough build support to build external modules'
1512         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1513         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1514         @echo  ''
1515         @echo  'Configuration targets:'
1516         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1517         @echo  ''
1518         @echo  'Other generic targets:'
1519         @echo  '  all             - Build all targets marked with [*]'
1520         @echo  '* vmlinux         - Build the bare kernel'
1521         @echo  '* modules         - Build all modules'
1522         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1523         @echo  '  dir/            - Build all files in dir and below'
1524         @echo  '  dir/file.[ois]  - Build specified target only'
1525         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1526         @echo  '                    (requires compiler support for LLVM assembly generation)'
1527         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1528         @echo  '                    (requires a recent binutils and recent build (System.map))'
1529         @echo  '  dir/file.ko     - Build module including final link'
1530         @echo  '  modules_prepare - Set up for building external modules'
1531         @echo  '  tags/TAGS       - Generate tags file for editors'
1532         @echo  '  cscope          - Generate cscope index'
1533         @echo  '  gtags           - Generate GNU GLOBAL index'
1534         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1535         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1536         @echo  '  image_name      - Output the image name (use with make -s)'
1537         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1538          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1539          echo  ''
1540         @echo  'Static analysers:'
1541         @echo  '  checkstack      - Generate a list of stack hogs'
1542         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1543         @echo  '  versioncheck    - Sanity check on version.h usage'
1544         @echo  '  includecheck    - Check for duplicate included header files'
1545         @echo  '  export_report   - List the usages of all exported symbols'
1546         @echo  '  headerdep       - Detect inclusion cycles in headers'
1547         @echo  '  coccicheck      - Check with Coccinelle'
1548         @echo  ''
1549         @echo  'Tools:'
1550         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1551         @echo  ''
1552         @echo  'Kernel selftest:'
1553         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1554         @echo  '                    Build, install, and boot kernel before'
1555         @echo  '                    running kselftest on it'
1556         @echo  '  kselftest-clean - Remove all generated kselftest files'
1557         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1558         @echo  '                    .config.'
1559         @echo  ''
1560         @$(if $(dtstree), \
1561                 echo 'Devicetree:'; \
1562                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1563                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1564                 echo '  dt_binding_check - Validate device tree binding documents'; \
1565                 echo '  dtbs_check       - Validate device tree source files';\
1566                 echo '')
1567
1568         @echo 'Userspace tools targets:'
1569         @echo '  use "make tools/help"'
1570         @echo '  or  "cd tools; make help"'
1571         @echo  ''
1572         @echo  'Kernel packaging:'
1573         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1574         @echo  ''
1575         @echo  'Documentation targets:'
1576         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1577         @echo  ''
1578         @echo  'Architecture specific targets ($(SRCARCH)):'
1579         @$(if $(archhelp),$(archhelp),\
1580                 echo '  No architecture specific help defined for $(SRCARCH)')
1581         @echo  ''
1582         @$(if $(boards), \
1583                 $(foreach b, $(boards), \
1584                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1585                 echo '')
1586         @$(if $(board-dirs), \
1587                 $(foreach b, $(board-dirs), \
1588                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1589                 printf "  %-16s - Show all of the above\\n" help-boards; \
1590                 echo '')
1591
1592         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1593         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1594         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1595         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1596         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1597         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1598         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1599         @echo  '                1: warnings which may be relevant and do not occur too often'
1600         @echo  '                2: warnings which occur quite often but may still be relevant'
1601         @echo  '                3: more obscure warnings, can most likely be ignored'
1602         @echo  '                Multiple levels can be combined with W=12 or W=123'
1603         @echo  ''
1604         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1605         @echo  'For further info see the ./README file'
1606
1607
1608 help-board-dirs := $(addprefix help-,$(board-dirs))
1609
1610 help-boards: $(help-board-dirs)
1611
1612 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1613
1614 $(help-board-dirs): help-%:
1615         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1616         @$(if $(boards-per-dir), \
1617                 $(foreach b, $(boards-per-dir), \
1618                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1619                 echo '')
1620
1621
1622 # Documentation targets
1623 # ---------------------------------------------------------------------------
1624 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1625                linkcheckdocs dochelp refcheckdocs
1626 PHONY += $(DOC_TARGETS)
1627 $(DOC_TARGETS):
1628         $(Q)$(MAKE) $(build)=Documentation $@
1629
1630 # Misc
1631 # ---------------------------------------------------------------------------
1632
1633 PHONY += scripts_gdb
1634 scripts_gdb: prepare0
1635         $(Q)$(MAKE) $(build)=scripts/gdb
1636         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1637
1638 ifdef CONFIG_GDB_SCRIPTS
1639 all: scripts_gdb
1640 endif
1641
1642 else # KBUILD_EXTMOD
1643
1644 ###
1645 # External module support.
1646 # When building external modules the kernel used as basis is considered
1647 # read-only, and no consistency checks are made and the make
1648 # system is not used on the basis kernel. If updates are required
1649 # in the basis kernel ordinary make commands (without M=...) must
1650 # be used.
1651 #
1652 # The following are the only valid targets when building external
1653 # modules.
1654 # make M=dir clean     Delete all automatically generated files
1655 # make M=dir modules   Make all modules in specified dir
1656 # make M=dir           Same as 'make M=dir modules'
1657 # make M=dir modules_install
1658 #                      Install the modules built in the module directory
1659 #                      Assumes install directory is already created
1660
1661 # We are always building modules
1662 KBUILD_MODULES := 1
1663
1664 PHONY += $(objtree)/Module.symvers
1665 $(objtree)/Module.symvers:
1666         @test -e $(objtree)/Module.symvers || ( \
1667         echo; \
1668         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1669         echo "           is missing; modules will have no dependencies and modversions."; \
1670         echo )
1671
1672 build-dirs := $(KBUILD_EXTMOD)
1673 PHONY += modules
1674 modules: descend $(objtree)/Module.symvers
1675         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1676
1677 PHONY += modules_install
1678 modules_install: _emodinst_ _emodinst_post
1679
1680 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1681 PHONY += _emodinst_
1682 _emodinst_:
1683         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1684         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1685
1686 PHONY += _emodinst_post
1687 _emodinst_post: _emodinst_
1688         $(call cmd,depmod)
1689
1690 clean-dirs := $(KBUILD_EXTMOD)
1691 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1692
1693 PHONY += /
1694 /:
1695         @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1696
1697 PHONY += help
1698 help:
1699         @echo  '  Building external modules.'
1700         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1701         @echo  ''
1702         @echo  '  modules         - default target, build the module(s)'
1703         @echo  '  modules_install - install the module'
1704         @echo  '  clean           - remove generated files in module directory only'
1705         @echo  ''
1706
1707 PHONY += prepare
1708 endif # KBUILD_EXTMOD
1709
1710 # Single targets
1711 # ---------------------------------------------------------------------------
1712 # To build individual files in subdirectories, you can do like this:
1713 #
1714 #   make foo/bar/baz.s
1715 #
1716 # The supported suffixes for single-target are listed in 'single-targets'
1717 #
1718 # To build only under specific subdirectories, you can do like this:
1719 #
1720 #   make foo/bar/baz/
1721
1722 ifdef single-build
1723
1724 # .ko is special because modpost is needed
1725 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1726 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1727
1728 $(single-ko): single_modpost
1729         @:
1730 $(single-no-ko): descend
1731         @:
1732
1733 ifeq ($(KBUILD_EXTMOD),)
1734 # For the single build of in-tree modules, use a temporary file to avoid
1735 # the situation of modules_install installing an invalid modules.order.
1736 MODORDER := .modules.tmp
1737 endif
1738
1739 PHONY += single_modpost
1740 single_modpost: $(single-no-ko)
1741         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1742         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1743
1744 KBUILD_MODULES := 1
1745
1746 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1747
1748 # trim unrelated directories
1749 build-dirs := $(foreach d, $(build-dirs), \
1750                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1751
1752 endif
1753
1754 # Handle descending into subdirectories listed in $(build-dirs)
1755 # Preset locale variables to speed up the build process. Limit locale
1756 # tweaks to this spot to avoid wrong language settings when running
1757 # make menuconfig etc.
1758 # Error messages still appears in the original language
1759 PHONY += descend $(build-dirs)
1760 descend: $(build-dirs)
1761 $(build-dirs): prepare
1762         $(Q)$(MAKE) $(build)=$@ \
1763         single-build=$(if $(filter-out $@/, $(single-no-ko)),1) \
1764         need-builtin=1 need-modorder=1
1765
1766 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1767 PHONY += $(clean-dirs) clean
1768 $(clean-dirs):
1769         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1770
1771 clean: $(clean-dirs)
1772         $(call cmd,rmdirs)
1773         $(call cmd,rmfiles)
1774         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1775                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1776                 -o -name '*.ko.*' \
1777                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1778                 -o -name '*.dwo' -o -name '*.lst' \
1779                 -o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \
1780                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1781                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1782                 -o -name '*.asn1.[ch]' \
1783                 -o -name '*.symtypes' -o -name 'modules.order' \
1784                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1785                 -o -name '*.c.[012]*.*' \
1786                 -o -name '*.ll' \
1787                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1788
1789 # Generate tags for editors
1790 # ---------------------------------------------------------------------------
1791 quiet_cmd_tags = GEN     $@
1792       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1793
1794 tags TAGS cscope gtags: FORCE
1795         $(call cmd,tags)
1796
1797 # Script to generate missing namespace dependencies
1798 # ---------------------------------------------------------------------------
1799
1800 PHONY += nsdeps
1801
1802 nsdeps: modules
1803         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps
1804         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1805
1806 # Scripts to check various things for consistency
1807 # ---------------------------------------------------------------------------
1808
1809 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1810
1811 includecheck:
1812         find $(srctree)/* $(RCS_FIND_IGNORE) \
1813                 -name '*.[hcS]' -type f -print | sort \
1814                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1815
1816 versioncheck:
1817         find $(srctree)/* $(RCS_FIND_IGNORE) \
1818                 -name '*.[hcS]' -type f -print | sort \
1819                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1820
1821 coccicheck:
1822         $(Q)$(BASH) $(srctree)/scripts/$@
1823
1824 namespacecheck:
1825         $(PERL) $(srctree)/scripts/namespace.pl
1826
1827 export_report:
1828         $(PERL) $(srctree)/scripts/export_report.pl
1829
1830 PHONY += checkstack kernelrelease kernelversion image_name
1831
1832 # UML needs a little special treatment here.  It wants to use the host
1833 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1834 # else wants $(ARCH), including people doing cross-builds, which means
1835 # that $(SUBARCH) doesn't work here.
1836 ifeq ($(ARCH), um)
1837 CHECKSTACK_ARCH := $(SUBARCH)
1838 else
1839 CHECKSTACK_ARCH := $(ARCH)
1840 endif
1841 checkstack:
1842         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1843         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1844
1845 kernelrelease:
1846         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1847
1848 kernelversion:
1849         @echo $(KERNELVERSION)
1850
1851 image_name:
1852         @echo $(KBUILD_IMAGE)
1853
1854 # Clear a bunch of variables before executing the submake
1855
1856 ifeq ($(quiet),silent_)
1857 tools_silent=s
1858 endif
1859
1860 tools/: FORCE
1861         $(Q)mkdir -p $(objtree)/tools
1862         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1863
1864 tools/%: FORCE
1865         $(Q)mkdir -p $(objtree)/tools
1866         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1867
1868 # FIXME Should go into a make.lib or something
1869 # ===========================================================================
1870
1871 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1872       cmd_rmdirs = rm -rf $(rm-dirs)
1873
1874 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1875       cmd_rmfiles = rm -f $(rm-files)
1876
1877 # Run depmod only if we have System.map and depmod is executable
1878 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1879       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1880                    $(KERNELRELEASE)
1881
1882 # read saved command lines for existing targets
1883 existing-targets := $(wildcard $(sort $(targets)))
1884
1885 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1886
1887 endif # config-targets
1888 endif # mixed-build
1889 endif # need-sub-make
1890
1891 PHONY += FORCE
1892 FORCE:
1893
1894 # Declare the contents of the PHONY variable as phony.  We keep that
1895 # information in a variable so we can use it in if_changed and friends.
1896 .PHONY: $(PHONY)