Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 14
   4 SUBLEVEL = 113
   5 EXTRAVERSION =
   6 NAME = Petit Gorille
   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                                                                 && /bin/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         @lib/libdss-build.sh $(KBUILD_OUTPUT)/
 149
 150 # Leave processing to above invocation of make
 151 skip-makefile := 1
 152 endif # ifneq ($(KBUILD_OUTPUT),)
 153 endif # ifeq ($(KBUILD_SRC),)
 154
 155 # We process the rest of the Makefile if this is the final invocation of make
 156 ifeq ($(skip-makefile),)
 157
 158 # Do not print "Entering directory ...",
 159 # but we want to display it when entering to the output directory
 160 # so that IDEs/editors are able to understand relative filenames.
 161 MAKEFLAGS += --no-print-directory
 162
 163 # Call a source code checker (by default, "sparse") as part of the
 164 # C compilation.
 165 #
 166 # Use 'make C=1' to enable checking of only re-compiled files.
 167 # Use 'make C=2' to enable checking of *all* source files, regardless
 168 # of whether they are re-compiled or not.
 169 #
 170 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 171 # including where to get the "sparse" utility.
 172
 173 ifeq ("$(origin C)", "command line")
 174   KBUILD_CHECKSRC = $(C)
 175 endif
 176 ifndef KBUILD_CHECKSRC
 177   KBUILD_CHECKSRC = 0
 178 endif
 179
 180 # Use make M=dir to specify directory of external module to build
 181 # Old syntax make ... SUBDIRS=$PWD is still supported
 182 # Setting the environment variable KBUILD_EXTMOD take precedence
 183 ifdef SUBDIRS
 184   KBUILD_EXTMOD ?= $(SUBDIRS)
 185 endif
 186
 187 ifeq ("$(origin M)", "command line")
 188   KBUILD_EXTMOD := $(M)
 189 endif
 190
 191 ifeq ($(KBUILD_SRC),)
 192         # building in the source tree
 193         srctree := .
 194 else
 195         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 196                 # building in a subdirectory of the source tree
 197                 srctree := ..
 198         else
 199                 srctree := $(KBUILD_SRC)
 200         endif
 201 endif
 202
 203 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 204
 205 objtree         := .
 206 src             := $(srctree)
 207 obj             := $(objtree)
 208
 209 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 210
 211 export srctree objtree VPATH
 212
 213 # To make sure we do not include .config for any of the *config targets
 214 # catch them early, and hand them over to scripts/kconfig/Makefile
 215 # It is allowed to specify more targets when calling make, including
 216 # mixing *config targets and build targets.
 217 # For example 'make oldconfig all'.
 218 # Detect when mixed targets is specified, and make a second invocation
 219 # of make so .config is not included in this case either (for *config).
 220
 221 version_h := include/generated/uapi/linux/version.h
 222 old_version_h := include/linux/version.h
 223
 224 no-dot-config-targets := clean mrproper distclean \
 225                          cscope gtags TAGS tags help% %docs check% coccicheck \
 226                          $(version_h) headers_% archheaders archscripts \
 227                          kernelversion %src-pkg
 228
 229 config-targets := 0
 230 mixed-targets  := 0
 231 dot-config     := 1
 232
 233 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 234         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 235                 dot-config := 0
 236         endif
 237 endif
 238
 239 ifeq ($(KBUILD_EXTMOD),)
 240         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 241                 config-targets := 1
 242                 ifneq ($(words $(MAKECMDGOALS)),1)
 243                         mixed-targets := 1
 244                 endif
 245         endif
 246 endif
 247 # install and modules_install need also be processed one by one
 248 ifneq ($(filter install,$(MAKECMDGOALS)),)
 249         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 250                 mixed-targets := 1
 251         endif
 252 endif
 253
 254 ifeq ($(mixed-targets),1)
 255 # ===========================================================================
 256 # We're called with mixed targets (*config and build targets).
 257 # Handle them one by one.
 258
 259 PHONY += $(MAKECMDGOALS) __build_one_by_one
 260
 261 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 262         @:
 263
 264 __build_one_by_one:
 265         $(Q)set -e; \
 266         for i in $(MAKECMDGOALS); do \
 267                 $(MAKE) -f $(srctree)/Makefile $$i; \
 268         done
 269
 270 else
 271
 272 # We need some generic definitions (do not try to remake the file).
 273 scripts/Kbuild.include: ;
 274 include scripts/Kbuild.include
 275
 276 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 277 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 278 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 279 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 280
 281 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 282 # first, and if a usermode build is happening, the "ARCH=um" on the command
 283 # line overrides the setting of ARCH below.  If a native build is happening,
 284 # then ARCH is assigned, getting whatever value it gets normally, and
 285 # SUBARCH is subsequently ignored.
 286
 287 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 288                                   -e s/sun4u/sparc64/ \
 289                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 290                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 291                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 292                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 293
 294 # Cross compiling and selecting different set of gcc/bin-utils
 295 # ---------------------------------------------------------------------------
 296 #
 297 # When performing cross compilation for other architectures ARCH shall be set
 298 # to the target architecture. (See arch/* for the possibilities).
 299 # ARCH can be set during invocation of make:
 300 # make ARCH=ia64
 301 # Another way is to have ARCH set in the environment.
 302 # The default ARCH is the host where make is executed.
 303
 304 # CROSS_COMPILE specify the prefix used for all executables used
 305 # during compilation. Only gcc and related bin-utils executables
 306 # are prefixed with $(CROSS_COMPILE).
 307 # CROSS_COMPILE can be set on the command line
 308 # make CROSS_COMPILE=ia64-linux-
 309 # Alternatively CROSS_COMPILE can be set in the environment.
 310 # A third alternative is to store a setting in .config so that plain
 311 # "make" in the configured kernel build directory always uses that.
 312 # Default value for CROSS_COMPILE is not to prefix executables
 313 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 314 ARCH            ?= $(SUBARCH)
 315 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 316
 317 # Architecture as present in compile.h
 318 UTS_MACHINE     := $(ARCH)
 319 SRCARCH         := $(ARCH)
 320
 321 # Additional ARCH settings for x86
 322 ifeq ($(ARCH),i386)
 323         SRCARCH := x86
 324 endif
 325 ifeq ($(ARCH),x86_64)
 326         SRCARCH := x86
 327 endif
 328
 329 # Additional ARCH settings for sparc
 330 ifeq ($(ARCH),sparc32)
 331        SRCARCH := sparc
 332 endif
 333 ifeq ($(ARCH),sparc64)
 334        SRCARCH := sparc
 335 endif
 336
 337 # Additional ARCH settings for sh
 338 ifeq ($(ARCH),sh64)
 339        SRCARCH := sh
 340 endif
 341
 342 # Additional ARCH settings for tile
 343 ifeq ($(ARCH),tilepro)
 344        SRCARCH := tile
 345 endif
 346 ifeq ($(ARCH),tilegx)
 347        SRCARCH := tile
 348 endif
 349
 350 # Where to locate arch specific headers
 351 hdr-arch  := $(SRCARCH)
 352
 353 KCONFIG_CONFIG  ?= .config
 354 export KCONFIG_CONFIG
 355
 356 # SHELL used by kbuild
 357 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 358           else if [ -x /bin/bash ]; then echo /bin/bash; \
 359           else echo sh; fi ; fi)
 360
 361 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 362 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 363 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 364
 365 HOSTCC       = gcc
 366 HOSTCXX      = g++
 367 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 368                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 369 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 370 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 371 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 372
 373 # Make variables (CC, etc...)
 374 AS              = $(CROSS_COMPILE)as
 375 LD              = $(CROSS_COMPILE)ld
 376 LDGOLD          = $(CROSS_COMPILE)ld.gold
 377 CC              = $(CROSS_COMPILE)gcc
 378 CPP             = $(CC) -E
 379 AR              = $(CROSS_COMPILE)ar
 380 NM              = $(CROSS_COMPILE)nm
 381 STRIP           = $(CROSS_COMPILE)strip
 382 OBJCOPY         = $(CROSS_COMPILE)objcopy
 383 OBJDUMP         = $(CROSS_COMPILE)objdump
 384 AWK             = awk
 385 GENKSYMS        = scripts/genksyms/genksyms
 386 INSTALLKERNEL  := installkernel
 387 DEPMOD          = /sbin/depmod
 388 PERL            = perl
 389 PYTHON          = python
 390 CHECK           = sparse
 391
 392 ifeq ($(CONFIG_EXYNOS_FMP_FIPS),)
 393 READELF        = $(CROSS_COMPILE)readelf
 394 export READELF
 395 endif
 396
 397 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 398                   -Wbitwise -Wno-return-void $(CF)
 399 NOSTDINC_FLAGS  =
 400 CFLAGS_MODULE   =
 401 AFLAGS_MODULE   =
 402 LDFLAGS_MODULE  =
 403 CFLAGS_KERNEL   =
 404 AFLAGS_KERNEL   =
 405 LDFLAGS_vmlinux =
 406
 407 # Use USERINCLUDE when you must reference the UAPI directories only.
 408 USERINCLUDE    := \
 409                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 410                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 411                 -I$(srctree)/include/uapi \
 412                 -I$(objtree)/include/generated/uapi \
 413                 -include $(srctree)/include/linux/kconfig.h
 414
 415 # Use LINUXINCLUDE when you must reference the include/ directory.
 416 # Needed to be compatible with the O= option
 417 LINUXINCLUDE    := \
 418                 -I$(srctree)/arch/$(hdr-arch)/include \
 419                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 420                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 421                 -I$(objtree)/include \
 422                 $(USERINCLUDE)
 423
 424 KBUILD_AFLAGS   := -D__ASSEMBLY__
 425 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 426                    -fno-strict-aliasing -fno-common -fshort-wchar \
 427                    -Werror-implicit-function-declaration \
 428                    -Wno-format-security \
 429                    -Werror \
 430                    -std=gnu89
 431 KBUILD_CPPFLAGS := -D__KERNEL__
 432 KBUILD_AFLAGS_KERNEL :=
 433 KBUILD_CFLAGS_KERNEL :=
 434 KBUILD_AFLAGS_MODULE  := -DMODULE
 435 KBUILD_CFLAGS_MODULE  := -DMODULE
 436 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 437 GCC_PLUGINS_CFLAGS :=
 438
 439 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 440 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 441 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 442 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 443
 444 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 445 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 446 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 447 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 448 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 449 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 450 export KBUILD_ARFLAGS
 451
 452 # When compiling out-of-tree modules, put MODVERDIR in the module
 453 # tree rather than in the kernel tree. The kernel tree might
 454 # even be read-only.
 455 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 456
 457 # Files to ignore in find ... statements
 458
 459 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 460                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 461                           -prune -o
 462 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 463                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 464
 465 # ===========================================================================
 466 # Rules shared between *config targets and build targets
 467
 468 # Basic helpers built in scripts/basic/
 469 PHONY += scripts_basic
 470 scripts_basic:
 471         $(Q)$(MAKE) $(build)=scripts/basic
 472         $(Q)rm -f .tmp_quiet_recordmcount
 473
 474 # To avoid any implicit rule to kick in, define an empty command.
 475 scripts/basic/%: scripts_basic ;
 476
 477 PHONY += outputmakefile
 478 # outputmakefile generates a Makefile in the output directory, if using a
 479 # separate output directory. This allows convenient use of make in the
 480 # output directory.
 481 outputmakefile:
 482 ifneq ($(KBUILD_SRC),)
 483         $(Q)ln -fsn $(srctree) source
 484         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 485             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 486 endif
 487
 488 ifeq ($(cc-name),clang)
 489 ifneq ($(CROSS_COMPILE),)
 490 CLANG_TRIPLE    ?= $(CROSS_COMPILE)
 491 CLANG_FLAGS     := --target=$(notdir $(CLANG_TRIPLE:%-=%))
 492 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 493 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 494 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 495 endif
 496 ifneq ($(GCC_TOOLCHAIN),)
 497 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 498 endif
 499 CLANG_FLAGS     += -no-integrated-as
 500 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 501 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 502 export CLANG_FLAGS
 503 endif
 504
 505 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 506 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 507 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 508 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 509 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 510 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 511 export RETPOLINE_CFLAGS
 512 export RETPOLINE_VDSO_CFLAGS
 513
 514 ifeq ($(config-targets),1)
 515 # ===========================================================================
 516 # *config targets only - make sure prerequisites are updated, and descend
 517 # in scripts/kconfig to make the *config target
 518
 519 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 520 # KBUILD_DEFCONFIG may point out an alternative default configuration
 521 # used for 'make defconfig'
 522 include arch/$(SRCARCH)/Makefile
 523 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 524
 525 config: scripts_basic outputmakefile FORCE
 526         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 527
 528 %config: scripts_basic outputmakefile FORCE
 529         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 530
 531 else
 532 # ===========================================================================
 533 # Build targets only - this includes vmlinux, arch specific targets, clean
 534 # targets and others. In general all targets except *config targets.
 535
 536 # If building an external module we do not care about the all: rule
 537 # but instead _all depend on modules
 538 PHONY += all
 539 ifeq ($(KBUILD_EXTMOD),)
 540 _all: all
 541 else
 542 _all: modules
 543 endif
 544
 545 # Decide whether to build built-in, modular, or both.
 546 # Normally, just do built-in.
 547
 548 KBUILD_MODULES :=
 549 KBUILD_BUILTIN := 1
 550
 551 # If we have only "make modules", don't compile built-in objects.
 552 # When we're building modules with modversions, we need to consider
 553 # the built-in objects during the descend as well, in order to
 554 # make sure the checksums are up to date before we record them.
 555
 556 ifeq ($(MAKECMDGOALS),modules)
 557   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 558 endif
 559
 560 # If we have "make <whatever> modules", compile modules
 561 # in addition to whatever we do anyway.
 562 # Just "make" or "make all" shall build modules as well
 563
 564 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 565   KBUILD_MODULES := 1
 566 endif
 567
 568 ifeq ($(MAKECMDGOALS),)
 569   KBUILD_MODULES := 1
 570 endif
 571
 572 export KBUILD_MODULES KBUILD_BUILTIN
 573
 574 ifeq ($(KBUILD_EXTMOD),)
 575 # Additional helpers built in scripts/
 576 # Carefully list dependencies so we do not try to build scripts twice
 577 # in parallel
 578 PHONY += scripts
 579 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 580          asm-generic gcc-plugins
 581         $(Q)$(MAKE) $(build)=$(@)
 582
 583 # Objects we will link into vmlinux / subdirs we need to visit
 584 init-y          := init/
 585 drivers-y       := drivers/ sound/ firmware/
 586 net-y           := net/
 587 libs-y          := lib/
 588 core-y          := usr/
 589 virt-y          := virt/
 590 endif # KBUILD_EXTMOD
 591
 592 ifeq ($(dot-config),1)
 593 # Read in config
 594 -include include/config/auto.conf
 595
 596 ifeq ($(KBUILD_EXTMOD),)
 597 # Read in dependencies to all Kconfig* files, make sure to run
 598 # oldconfig if changes are detected.
 599 -include include/config/auto.conf.cmd
 600
 601 # To avoid any implicit rule to kick in, define an empty command
 602 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 603
 604 # If .config is newer than include/config/auto.conf, someone tinkered
 605 # with it and forgot to run make oldconfig.
 606 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 607 # we execute the config step to be sure to catch updated Kconfig files
 608 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 609         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 610 else
 611 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 612 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 613 PHONY += include/config/auto.conf
 614
 615 include/config/auto.conf:
 616         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 617         echo >&2;                                                       \
 618         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 619         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 620         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 621         echo >&2 ;                                                      \
 622         /bin/false)
 623
 624 endif # KBUILD_EXTMOD
 625
 626 else
 627 # Dummy target needed, because used as prerequisite
 628 include/config/auto.conf: ;
 629 endif # $(dot-config)
 630
 631 # For the kernel to actually contain only the needed exported symbols,
 632 # we have to build modules as well to determine what those symbols are.
 633 # (this can be evaluated only once include/config/auto.conf has been included)
 634 ifdef CONFIG_TRIM_UNUSED_KSYMS
 635   KBUILD_MODULES := 1
 636 endif
 637
 638 # The all: target is the default when no target is given on the
 639 # command line.
 640 # This allow a user to issue only 'make' to build a kernel including modules
 641 # Defaults to vmlinux, but the arch makefile usually adds further targets
 642 ifneq ($(O),)
 643 all: vmlinux
 644 else
 645 all: vmlinux
 646         @lib/libdss-build.sh
 647 endif
 648
 649 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 650 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 651 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 652 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 653 export CFLAGS_GCOV CFLAGS_KCOV
 654
 655 # Make toolchain changes before including arch/$(SRCARCH)/Makefile to ensure
 656 # ar/cc/ld-* macros return correct values.
 657 ifdef CONFIG_LTO_CLANG
 658 # use GNU gold with LLVMgold for LTO linking, and LD for vmlinux_link
 659 LDFINAL_vmlinux := $(LD)
 660 LD              := $(LDGOLD)
 661 LDFLAGS         += -plugin $(LTO_LLVM_LIB_BASE)LLVMgold.so
 662 # use llvm-ar for building symbol tables from IR files, and llvm-dis instead
 663 # of objdump for processing symbol versions and exports
 664 LLVM_AR         ?= llvm-ar
 665 LLVM_DIS        ?= llvm-dis
 666 export LLVM_AR LLVM_DIS
 667 endif
 668
 669 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 670 # values of the respective KBUILD_* variables
 671 ARCH_CPPFLAGS :=
 672 ARCH_AFLAGS :=
 673 ARCH_CFLAGS :=
 674 include arch/$(SRCARCH)/Makefile
 675
 676 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 677 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 678 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 679 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 680 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 681 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 682
 683 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 684 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 685 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 686 else
 687 ifdef CONFIG_PROFILE_ALL_BRANCHES
 688 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 689 else
 690 KBUILD_CFLAGS   += -O2
 691 endif
 692 endif
 693
 694 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 695                         $(call cc-disable-warning,maybe-uninitialized,))
 696
 697 # Tell gcc to never replace conditional load with a non-conditional one
 698 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 699
 700 # check for 'asm goto'
 701 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 702         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 703         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 704 endif
 705
 706 include scripts/Makefile.gcc-plugins
 707
 708 ifdef CONFIG_READABLE_ASM
 709 # Disable optimizations that make assembler listings hard to read.
 710 # reorder blocks reorders the control in the function
 711 # ipa clone creates specialized cloned functions
 712 # partial inlining inlines only parts of functions
 713 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 714                  $(call cc-option,-fno-ipa-cp-clone,) \
 715                  $(call cc-option,-fno-partial-inlining)
 716 endif
 717
 718 ifneq ($(CONFIG_FRAME_WARN),0)
 719 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 720 endif
 721
 722 # This selects the stack protector compiler flag. Testing it is delayed
 723 # until after .config has been reprocessed, in the prepare-compiler-check
 724 # target.
 725 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 726   stackp-flag := -fstack-protector
 727   stackp-name := REGULAR
 728 else
 729 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 730   stackp-flag := -fstack-protector-strong
 731   stackp-name := STRONG
 732 else
 733   # Force off for distro compilers that enable stack protector by default.
 734   stackp-flag := $(call cc-option, -fno-stack-protector)
 735 endif
 736 endif
 737 # Find arch-specific stack protector compiler sanity-checking script.
 738 ifdef CONFIG_CC_STACKPROTECTOR
 739   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 740   stackp-check := $(wildcard $(stackp-path))
 741 endif
 742 KBUILD_CFLAGS += $(stackp-flag)
 743
 744 ifeq ($(cc-name),clang)
 745 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 746 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 747 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 748 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 749 KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
 750 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 751 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 752 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 753 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 754 # See modpost pattern 2
 755 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 756 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 757 else
 758
 759 # These warnings generated too much noise in a regular build.
 760 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 761 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 762 endif
 763
 764 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 765 ifdef CONFIG_FRAME_POINTER
 766 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 767 else
 768 # Some targets (ARM with Thumb2, for example), can't be built with frame
 769 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 770 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 771 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 772 # -fomit-frame-pointer with FUNCTION_TRACER.
 773 ifndef CONFIG_FUNCTION_TRACER
 774 KBUILD_CFLAGS   += -fomit-frame-pointer
 775 endif
 776 endif
 777
 778 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 779
 780 ifdef CONFIG_DEBUG_INFO
 781 ifdef CONFIG_DEBUG_INFO_SPLIT
 782 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 783 else
 784 KBUILD_CFLAGS   += -g
 785 endif
 786 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 787 endif
 788 ifdef CONFIG_DEBUG_INFO_DWARF4
 789 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 790 endif
 791
 792 ifdef CONFIG_DEBUG_INFO_REDUCED
 793 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 794                    $(call cc-option,-fno-var-tracking)
 795 endif
 796
 797 ifdef CONFIG_FUNCTION_TRACER
 798 ifndef CC_FLAGS_FTRACE
 799 CC_FLAGS_FTRACE := -pg
 800 endif
 801 export CC_FLAGS_FTRACE
 802 ifdef CONFIG_HAVE_FENTRY
 803 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 804 endif
 805 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 806 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 807 ifdef CONFIG_DYNAMIC_FTRACE
 808         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 809                 BUILD_C_RECORDMCOUNT := y
 810                 export BUILD_C_RECORDMCOUNT
 811         endif
 812 endif
 813 endif
 814
 815 # We trigger additional mismatches with less inlining
 816 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 817 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 818 endif
 819
 820 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 821 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 822 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 823 endif
 824
 825 ifdef CONFIG_LTO_CLANG
 826 lto-clang-flags := -flto -fvisibility=hidden
 827
 828 # allow disabling only clang LTO where needed
 829 DISABLE_LTO_CLANG := -fno-lto -fvisibility=default
 830 export DISABLE_LTO_CLANG
 831 endif
 832
 833 ifdef CONFIG_LTO
 834 lto-flags       := $(lto-clang-flags)
 835 KBUILD_CFLAGS   += $(lto-flags)
 836
 837 DISABLE_LTO     := $(DISABLE_LTO_CLANG)
 838 export DISABLE_LTO
 839
 840 # LDFINAL_vmlinux and LDFLAGS_FINAL_vmlinux can be set to override
 841 # the linker and flags for vmlinux_link.
 842 export LDFINAL_vmlinux LDFLAGS_FINAL_vmlinux
 843 endif
 844
 845 ifdef CONFIG_CFI_CLANG
 846 cfi-clang-flags += -fsanitize=cfi
 847 DISABLE_CFI_CLANG := -fno-sanitize=cfi
 848 ifdef CONFIG_MODULES
 849 cfi-clang-flags += -fsanitize-cfi-cross-dso
 850 DISABLE_CFI_CLANG += -fno-sanitize-cfi-cross-dso
 851 endif
 852 ifdef CONFIG_CFI_PERMISSIVE
 853 cfi-clang-flags += -fsanitize-recover=cfi -fno-sanitize-trap=cfi
 854 endif
 855
 856 # also disable CFI when LTO is disabled
 857 DISABLE_LTO_CLANG += $(DISABLE_CFI_CLANG)
 858 # allow disabling only clang CFI where needed
 859 export DISABLE_CFI_CLANG
 860 endif
 861
 862 ifdef CONFIG_CFI
 863 # cfi-flags are re-tested in prepare-compiler-check
 864 cfi-flags       := $(cfi-clang-flags)
 865 KBUILD_CFLAGS   += $(cfi-flags)
 866
 867 DISABLE_CFI     := $(DISABLE_CFI_CLANG)
 868 DISABLE_LTO     += $(DISABLE_CFI)
 869 export DISABLE_CFI
 870 endif
 871
 872 # arch Makefile may override CC so keep this after arch Makefile is included
 873 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 874 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 875
 876 # warn about C99 declaration after statement
 877 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 878
 879 # disable pointer signed / unsigned warnings in gcc 4.0
 880 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 881
 882 # disable stringop warnings in gcc 8+
 883 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 884
 885 # disable invalid "can't wrap" optimizations for signed / pointers
 886 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 887
 888 # clang sets -fmerge-all-constants by default as optimization, but this
 889 # is non-conforming behavior for C and in fact breaks the kernel, so we
 890 # need to disable it here generally.
 891 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 892
 893 # for gcc -fno-merge-all-constants disables everything, but it is fine
 894 # to have actual conforming behavior enabled.
 895 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 896
 897 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 898 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 899
 900 # conserve stack if available
 901 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 902
 903 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 904 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 905
 906 # require functions to have arguments in prototypes, not empty 'int foo()'
 907 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 908
 909 # Prohibit date/time macros, which would make the build non-deterministic
 910 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 911
 912 # enforce correct pointer usage
 913 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 914
 915 # Require designated initializers for all marked structures
 916 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 917
 918 # use the deterministic mode of AR if available
 919 KBUILD_ARFLAGS := $(call ar-option,D)
 920
 921 include scripts/Makefile.kasan
 922 include scripts/Makefile.extrawarn
 923 include scripts/Makefile.ubsan
 924
 925 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 926 # last assignments
 927 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 928 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 929 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 930
 931 # Use --build-id when available.
 932 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 933                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 934 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 935 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 936
 937 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 938 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 939 endif
 940
 941 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 942 LDFLAGS_vmlinux += $(call ld-option, -X,)
 943 endif
 944
 945 # Default kernel image to build when no specific target is given.
 946 # KBUILD_IMAGE may be overruled on the command line or
 947 # set in the environment
 948 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 949 # this default value
 950 export KBUILD_IMAGE ?= vmlinux
 951
 952 #
 953 # INSTALL_PATH specifies where to place the updated kernel and system map
 954 # images. Default is /boot, but you can set it to other values
 955 export  INSTALL_PATH ?= /boot
 956
 957 #
 958 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 959 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 960 # an argument if needed. Otherwise it defaults to the kernel install path
 961 #
 962 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 963
 964 #
 965 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 966 # relocations required by build roots.  This is not defined in the
 967 # makefile but the argument can be passed to make if needed.
 968 #
 969
 970 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 971 export MODLIB
 972
 973 #
 974 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 975 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 976 # the default option --strip-debug will be used.  Otherwise,
 977 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 978
 979 ifdef INSTALL_MOD_STRIP
 980 ifeq ($(INSTALL_MOD_STRIP),1)
 981 mod_strip_cmd = $(STRIP) --strip-debug
 982 else
 983 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 984 endif # INSTALL_MOD_STRIP=1
 985 else
 986 mod_strip_cmd = true
 987 endif # INSTALL_MOD_STRIP
 988 export mod_strip_cmd
 989
 990 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 991 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 992 # or CONFIG_MODULE_COMPRESS_XZ.
 993
 994 mod_compress_cmd = true
 995 ifdef CONFIG_MODULE_COMPRESS
 996   ifdef CONFIG_MODULE_COMPRESS_GZIP
 997     mod_compress_cmd = gzip -n -f
 998   endif # CONFIG_MODULE_COMPRESS_GZIP
 999   ifdef CONFIG_MODULE_COMPRESS_XZ
1000     mod_compress_cmd = xz -f
1001   endif # CONFIG_MODULE_COMPRESS_XZ
1002 endif # CONFIG_MODULE_COMPRESS
1003 export mod_compress_cmd
1004
1005 # Select initial ramdisk compression format, default is gzip(1).
1006 # This shall be used by the dracut(8) tool while creating an initramfs image.
1007 #
1008 INITRD_COMPRESS-y                  := gzip
1009 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
1010 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
1011 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
1012 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
1013 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
1014 # do not export INITRD_COMPRESS, since we didn't actually
1015 # choose a sane default compression above.
1016 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
1017
1018 ifdef CONFIG_MODULE_SIG_ALL
1019 $(eval $(call config_filename,MODULE_SIG_KEY))
1020
1021 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1022 else
1023 mod_sign_cmd = true
1024 endif
1025 export mod_sign_cmd
1026
1027 ifdef CONFIG_STACK_VALIDATION
1028   has_libelf := $(call try-run,\
1029                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1030   ifeq ($(has_libelf),1)
1031     objtool_target := tools/objtool FORCE
1032   else
1033     SKIP_STACK_VALIDATION := 1
1034     export SKIP_STACK_VALIDATION
1035   endif
1036 endif
1037
1038
1039 ifeq ($(KBUILD_EXTMOD),)
1040 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1041
1042 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1043                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1044                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1045
1046 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
1047                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1048
1049 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
1050 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
1051 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
1052 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
1053 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1054 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
1055 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
1056
1057 # Externally visible symbols (used by link-vmlinux.sh)
1058 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1059 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1060 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1061 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1062 export LDFLAGS_vmlinux
1063 # used by scripts/package/Makefile
1064 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1065
1066 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1067
1068 # Include targets which we want to execute sequentially if the rest of the
1069 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1070 # evaluated more than once.
1071 PHONY += vmlinux_prereq
1072 vmlinux_prereq: $(vmlinux-deps) FORCE
1073 ifdef CONFIG_HEADERS_CHECK
1074         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1075 endif
1076 ifdef CONFIG_GDB_SCRIPTS
1077         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1078 endif
1079 ifdef CONFIG_TRIM_UNUSED_KSYMS
1080         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1081           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1082 endif
1083
1084 # standalone target for easier testing
1085 include/generated/autoksyms.h: FORCE
1086         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1087
1088 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1089
1090 # Final link of vmlinux with optional arch pass after final link
1091 cmd_link-vmlinux =                                                 \
1092         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1093         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1094
1095 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1096         +$(call if_changed,link-vmlinux)
1097
1098 # Build samples along the rest of the kernel
1099 ifdef CONFIG_SAMPLES
1100 vmlinux-dirs += samples
1101 endif
1102
1103 # The actual objects are generated when descending,
1104 # make sure no implicit rule kicks in
1105 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1106
1107 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1108 # Preset locale variables to speed up the build process. Limit locale
1109 # tweaks to this spot to avoid wrong language settings when running
1110 # make menuconfig etc.
1111 # Error messages still appears in the original language
1112
1113 PHONY += $(vmlinux-dirs)
1114 $(vmlinux-dirs): prepare scripts
1115         $(Q)$(MAKE) $(build)=$@
1116
1117 define filechk_kernel.release
1118         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1119 endef
1120
1121 # Store (new) KERNELRELEASE string in include/config/kernel.release
1122 include/config/kernel.release: include/config/auto.conf FORCE
1123         $(call filechk,kernel.release)
1124
1125
1126 # Things we need to do before we recursively start building the kernel
1127 # or the modules are listed in "prepare".
1128 # A multi level approach is used. prepareN is processed before prepareN-1.
1129 # archprepare is used in arch Makefiles and when processed asm symlink,
1130 # version.h and scripts_basic is processed / created.
1131
1132 # Listed in dependency order
1133 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1134
1135 # prepare3 is used to check if we are building in a separate output directory,
1136 # and if so do:
1137 # 1) Check that make has not been executed in the kernel src $(srctree)
1138 prepare3: include/config/kernel.release
1139 ifneq ($(KBUILD_SRC),)
1140         @$(kecho) '  Using $(srctree) as source for kernel'
1141         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1142                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1143                 echo >&2 "  in the '$(srctree)' directory.";\
1144                 /bin/false; \
1145         fi;
1146 endif
1147
1148 # prepare2 creates a makefile if using a separate output directory.
1149 # From this point forward, .config has been reprocessed, so any rules
1150 # that need to depend on updated CONFIG_* values can be checked here.
1151 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1152
1153 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1154                    include/config/auto.conf
1155         $(cmd_crmodverdir)
1156
1157 archprepare: archheaders archscripts prepare1 scripts_basic
1158
1159 prepare0: archprepare gcc-plugins
1160         $(Q)$(MAKE) $(build)=.
1161
1162 # All the preparing..
1163 prepare: prepare0 prepare-objtool
1164
1165 # Support for using generic headers in asm-generic
1166 PHONY += asm-generic uapi-asm-generic
1167 asm-generic: uapi-asm-generic
1168         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1169                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1170 uapi-asm-generic:
1171         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1172                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1173
1174 PHONY += prepare-objtool
1175 prepare-objtool: $(objtool_target)
1176 ifeq ($(SKIP_STACK_VALIDATION),1)
1177 ifdef CONFIG_UNWINDER_ORC
1178         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1179         @false
1180 else
1181         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1182 endif
1183 endif
1184
1185 # Check for CONFIG flags that require compiler support. Abort the build
1186 # after .config has been processed, but before the kernel build starts.
1187 #
1188 # For security-sensitive CONFIG options, we don't want to fallback and/or
1189 # silently change which compiler flags will be used, since that leads to
1190 # producing kernels with different security feature characteristics
1191 # depending on the compiler used. (For example, "But I selected
1192 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1193 PHONY += prepare-compiler-check
1194 prepare-compiler-check: FORCE
1195 # Make sure we're using a supported toolchain with LTO_CLANG
1196 ifdef CONFIG_LTO_CLANG
1197   ifneq ($(call clang-ifversion, -ge, 0500, y), y)
1198         @echo Cannot use CONFIG_LTO_CLANG: requires clang 5.0 or later >&2 && exit 1
1199   endif
1200   ifneq ($(call gold-ifversion, -ge, 112000000, y), y)
1201         @echo Cannot use CONFIG_LTO_CLANG: requires GNU gold 1.12 or later >&2 && exit 1
1202   endif
1203 endif
1204 # Make sure compiler supports LTO flags
1205 ifdef lto-flags
1206   ifeq ($(call cc-option, $(lto-flags)),)
1207         @echo Cannot use CONFIG_LTO: $(lto-flags) not supported by compiler \
1208                 >&2 && exit 1
1209   endif
1210 endif
1211 # Make sure compiler supports requested stack protector flag.
1212 ifdef stackp-name
1213   ifeq ($(call cc-option, $(stackp-flag)),)
1214         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1215                   $(stackp-flag) not supported by compiler >&2 && exit 1
1216   endif
1217 endif
1218 # Make sure compiler does not have buggy stack-protector support.
1219 ifdef stackp-check
1220   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1221         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1222                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1223   endif
1224 endif
1225 ifdef cfi-flags
1226   ifeq ($(call cc-option, $(cfi-flags)),)
1227         @echo Cannot use CONFIG_CFI: $(cfi-flags) not supported by compiler >&2 && exit 1
1228   endif
1229 endif
1230         @:
1231
1232 # Generate some files
1233 # ---------------------------------------------------------------------------
1234
1235 # KERNELRELEASE can change from a few different places, meaning version.h
1236 # needs to be updated, so this check is forced on all builds
1237
1238 uts_len := 64
1239 define filechk_utsrelease.h
1240         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1241           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1242           exit 1;                                                         \
1243         fi;                                                               \
1244         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1245 endef
1246
1247 define filechk_version.h
1248         (echo \#define LINUX_VERSION_CODE $(shell                         \
1249         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1250         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1251 endef
1252
1253 $(version_h): $(srctree)/Makefile FORCE
1254         $(call filechk,version.h)
1255         $(Q)rm -f $(old_version_h)
1256
1257 include/generated/utsrelease.h: include/config/kernel.release FORCE
1258         $(call filechk,utsrelease.h)
1259
1260 PHONY += headerdep
1261 headerdep:
1262         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1263         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1264
1265 # ---------------------------------------------------------------------------
1266 # Kernel headers
1267
1268 #Default location for installed headers
1269 export INSTALL_HDR_PATH = $(objtree)/usr
1270
1271 # If we do an all arch process set dst to include/arch-$(hdr-arch)
1272 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
1273
1274 PHONY += archheaders
1275 archheaders:
1276
1277 PHONY += archscripts
1278 archscripts:
1279
1280 PHONY += __headers
1281 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1282         $(Q)$(MAKE) $(build)=scripts build_unifdef
1283
1284 PHONY += headers_install_all
1285 headers_install_all:
1286         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1287
1288 PHONY += headers_install
1289 headers_install: __headers
1290         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1291           $(error Headers not exportable for the $(SRCARCH) architecture))
1292         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1293         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
1294
1295 PHONY += headers_check_all
1296 headers_check_all: headers_install_all
1297         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1298
1299 PHONY += headers_check
1300 headers_check: headers_install
1301         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1302         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
1303
1304 # ---------------------------------------------------------------------------
1305 # Kernel selftest
1306
1307 PHONY += kselftest
1308 kselftest:
1309         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1310
1311 PHONY += kselftest-clean
1312 kselftest-clean:
1313         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1314
1315 PHONY += kselftest-merge
1316 kselftest-merge:
1317         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1318         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1319                 -m $(objtree)/.config \
1320                 $(srctree)/tools/testing/selftests/*/config
1321         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1322
1323 # ---------------------------------------------------------------------------
1324 # Modules
1325
1326 ifdef CONFIG_MODULES
1327
1328 # By default, build modules as well
1329
1330 all: modules
1331
1332 # Build modules
1333 #
1334 # A module can be listed more than once in obj-m resulting in
1335 # duplicate lines in modules.order files.  Those are removed
1336 # using awk while concatenating to the final file.
1337
1338 PHONY += modules
1339 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1340         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1341         @$(kecho) '  Building modules, stage 2.';
1342         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1343
1344 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1345         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1346
1347 %/modules.builtin: include/config/auto.conf
1348         $(Q)$(MAKE) $(modbuiltin)=$*
1349
1350
1351 # Target to prepare building external modules
1352 PHONY += modules_prepare
1353 modules_prepare: prepare scripts
1354
1355 # Target to install modules
1356 PHONY += modules_install
1357 modules_install: _modinst_ _modinst_post
1358
1359 PHONY += _modinst_
1360 _modinst_:
1361         @rm -rf $(MODLIB)/kernel
1362         @rm -f $(MODLIB)/source
1363         @mkdir -p $(MODLIB)/kernel
1364         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1365         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1366                 rm -f $(MODLIB)/build ; \
1367                 ln -s $(CURDIR) $(MODLIB)/build ; \
1368         fi
1369         @cp -f $(objtree)/modules.order $(MODLIB)/
1370         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1371         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1372
1373 # This depmod is only for convenience to give the initial
1374 # boot a modules.dep even before / is mounted read-write.  However the
1375 # boot script depmod is the master version.
1376 PHONY += _modinst_post
1377 _modinst_post: _modinst_
1378         $(call cmd,depmod)
1379
1380 ifeq ($(CONFIG_MODULE_SIG), y)
1381 PHONY += modules_sign
1382 modules_sign:
1383         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1384 endif
1385
1386 else # CONFIG_MODULES
1387
1388 # Modules not configured
1389 # ---------------------------------------------------------------------------
1390
1391 PHONY += modules modules_install
1392 modules modules_install:
1393         @echo >&2
1394         @echo >&2 "The present kernel configuration has modules disabled."
1395         @echo >&2 "Type 'make config' and enable loadable module support."
1396         @echo >&2 "Then build a kernel with module support enabled."
1397         @echo >&2
1398         @exit 1
1399
1400 endif # CONFIG_MODULES
1401
1402 ###
1403 # Cleaning is done on three levels.
1404 # make clean     Delete most generated files
1405 #                Leave enough to build external modules
1406 # make mrproper  Delete the current configuration, and all generated files
1407 # make distclean Remove editor backup files, patch leftover files and the like
1408
1409 # Directories & files removed with 'make clean'
1410 CLEAN_DIRS  += $(MODVERDIR)
1411
1412 # Directories & files removed with 'make mrproper'
1413 MRPROPER_DIRS  += include/config usr/include include/generated          \
1414                   arch/*/include/generated .tmp_objdiff
1415 MRPROPER_FILES += .config .config.old .version .old_version \
1416                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1417                   signing_key.pem signing_key.priv signing_key.x509     \
1418                   x509.genkey extra_certificates signing_key.x509.keyid \
1419                   signing_key.x509.signer vmlinux-gdb.py
1420
1421 # clean - Delete most, but leave enough to build external modules
1422 #
1423 clean: rm-dirs  := $(CLEAN_DIRS)
1424 clean: rm-files := $(CLEAN_FILES)
1425 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1426
1427 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1428 $(clean-dirs):
1429         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1430
1431 vmlinuxclean:
1432         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1433         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1434
1435 clean: archclean vmlinuxclean
1436
1437 # mrproper - Delete all generated files, including .config
1438 #
1439 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1440 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1441 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1442
1443 PHONY += $(mrproper-dirs) mrproper archmrproper
1444 $(mrproper-dirs):
1445         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1446
1447 mrproper: clean archmrproper $(mrproper-dirs)
1448         $(call cmd,rmdirs)
1449         $(call cmd,rmfiles)
1450
1451 # distclean
1452 #
1453 PHONY += distclean
1454
1455 distclean: mrproper
1456         @find $(srctree) $(RCS_FIND_IGNORE) \
1457                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1458                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1459                 -o -name 'core' \) \
1460                 -type f -print | xargs rm -f
1461
1462
1463 # Packaging of the kernel to various formats
1464 # ---------------------------------------------------------------------------
1465 # rpm target kept for backward compatibility
1466 package-dir     := scripts/package
1467
1468 %src-pkg: FORCE
1469         $(Q)$(MAKE) $(build)=$(package-dir) $@
1470 %pkg: include/config/kernel.release FORCE
1471         $(Q)$(MAKE) $(build)=$(package-dir) $@
1472 rpm: include/config/kernel.release FORCE
1473         $(Q)$(MAKE) $(build)=$(package-dir) $@
1474
1475
1476 # Brief documentation of the typical targets used
1477 # ---------------------------------------------------------------------------
1478
1479 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1480 boards := $(sort $(notdir $(boards)))
1481 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1482 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1483
1484 PHONY += help
1485 help:
1486         @echo  'Cleaning targets:'
1487         @echo  '  clean           - Remove most generated files but keep the config and'
1488         @echo  '                    enough build support to build external modules'
1489         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1490         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1491         @echo  ''
1492         @echo  'Configuration targets:'
1493         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1494         @echo  ''
1495         @echo  'Other generic targets:'
1496         @echo  '  all             - Build all targets marked with [*]'
1497         @echo  '* vmlinux         - Build the bare kernel'
1498         @echo  '* modules         - Build all modules'
1499         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1500         @echo  '  dir/            - Build all files in dir and below'
1501         @echo  '  dir/file.[ois]  - Build specified target only'
1502         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1503         @echo  '                    (requires compiler support for LLVM assembly generation)'
1504         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1505         @echo  '                    (requires a recent binutils and recent build (System.map))'
1506         @echo  '  dir/file.ko     - Build module including final link'
1507         @echo  '  modules_prepare - Set up for building external modules'
1508         @echo  '  tags/TAGS       - Generate tags file for editors'
1509         @echo  '  cscope          - Generate cscope index'
1510         @echo  '  gtags           - Generate GNU GLOBAL index'
1511         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1512         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1513         @echo  '  image_name      - Output the image name (use with make -s)'
1514         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1515          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1516          echo  ''
1517         @echo  'Static analysers:'
1518         @echo  '  checkstack      - Generate a list of stack hogs'
1519         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1520         @echo  '  versioncheck    - Sanity check on version.h usage'
1521         @echo  '  includecheck    - Check for duplicate included header files'
1522         @echo  '  export_report   - List the usages of all exported symbols'
1523         @echo  '  headers_check   - Sanity check on exported headers'
1524         @echo  '  headerdep       - Detect inclusion cycles in headers'
1525         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1526         @echo  ''
1527         @echo  'Kernel selftest:'
1528         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1529         @echo  '                    Build, install, and boot kernel before'
1530         @echo  '                    running kselftest on it'
1531         @echo  '  kselftest-clean - Remove all generated kselftest files'
1532         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1533         @echo  '                    .config.'
1534         @echo  ''
1535         @echo 'Userspace tools targets:'
1536         @echo '  use "make tools/help"'
1537         @echo '  or  "cd tools; make help"'
1538         @echo  ''
1539         @echo  'Kernel packaging:'
1540         @$(MAKE) $(build)=$(package-dir) help
1541         @echo  ''
1542         @echo  'Documentation targets:'
1543         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1544         @echo  ''
1545         @echo  'Architecture specific targets ($(SRCARCH)):'
1546         @$(if $(archhelp),$(archhelp),\
1547                 echo '  No architecture specific help defined for $(SRCARCH)')
1548         @echo  ''
1549         @$(if $(boards), \
1550                 $(foreach b, $(boards), \
1551                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1552                 echo '')
1553         @$(if $(board-dirs), \
1554                 $(foreach b, $(board-dirs), \
1555                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1556                 printf "  %-16s - Show all of the above\\n" help-boards; \
1557                 echo '')
1558
1559         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1560         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1561         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1562         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1563         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1564         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1565         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1566         @echo  '                1: warnings which may be relevant and do not occur too often'
1567         @echo  '                2: warnings which occur quite often but may still be relevant'
1568         @echo  '                3: more obscure warnings, can most likely be ignored'
1569         @echo  '                Multiple levels can be combined with W=12 or W=123'
1570         @echo  ''
1571         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1572         @echo  'For further info see the ./README file'
1573
1574
1575 help-board-dirs := $(addprefix help-,$(board-dirs))
1576
1577 help-boards: $(help-board-dirs)
1578
1579 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1580
1581 $(help-board-dirs): help-%:
1582         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1583         @$(if $(boards-per-dir), \
1584                 $(foreach b, $(boards-per-dir), \
1585                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1586                 echo '')
1587
1588
1589 # Documentation targets
1590 # ---------------------------------------------------------------------------
1591 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
1592 PHONY += $(DOC_TARGETS)
1593 $(DOC_TARGETS): scripts_basic FORCE
1594         $(Q)$(MAKE) $(build)=Documentation $@
1595
1596 else # KBUILD_EXTMOD
1597
1598 ###
1599 # External module support.
1600 # When building external modules the kernel used as basis is considered
1601 # read-only, and no consistency checks are made and the make
1602 # system is not used on the basis kernel. If updates are required
1603 # in the basis kernel ordinary make commands (without M=...) must
1604 # be used.
1605 #
1606 # The following are the only valid targets when building external
1607 # modules.
1608 # make M=dir clean     Delete all automatically generated files
1609 # make M=dir modules   Make all modules in specified dir
1610 # make M=dir           Same as 'make M=dir modules'
1611 # make M=dir modules_install
1612 #                      Install the modules built in the module directory
1613 #                      Assumes install directory is already created
1614
1615 # We are always building modules
1616 KBUILD_MODULES := 1
1617 PHONY += crmodverdir
1618 crmodverdir:
1619         $(cmd_crmodverdir)
1620
1621 PHONY += $(objtree)/Module.symvers
1622 $(objtree)/Module.symvers:
1623         @test -e $(objtree)/Module.symvers || ( \
1624         echo; \
1625         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1626         echo "           is missing; modules will have no dependencies and modversions."; \
1627         echo )
1628
1629 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1630 PHONY += $(module-dirs) modules
1631 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1632         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1633
1634 modules: $(module-dirs)
1635         @$(kecho) '  Building modules, stage 2.';
1636         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1637
1638 PHONY += modules_install
1639 modules_install: _emodinst_ _emodinst_post
1640
1641 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1642 PHONY += _emodinst_
1643 _emodinst_:
1644         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1645         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1646
1647 PHONY += _emodinst_post
1648 _emodinst_post: _emodinst_
1649         $(call cmd,depmod)
1650
1651 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1652
1653 PHONY += $(clean-dirs) clean
1654 $(clean-dirs):
1655         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1656
1657 clean:  rm-dirs := $(MODVERDIR)
1658 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1659
1660 PHONY += help
1661 help:
1662         @echo  '  Building external modules.'
1663         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1664         @echo  ''
1665         @echo  '  modules         - default target, build the module(s)'
1666         @echo  '  modules_install - install the module'
1667         @echo  '  clean           - remove generated files in module directory only'
1668         @echo  ''
1669
1670 # Dummies...
1671 PHONY += prepare scripts
1672 prepare: ;
1673 scripts: ;
1674 endif # KBUILD_EXTMOD
1675
1676 clean: $(clean-dirs)
1677         $(call cmd,rmdirs)
1678         $(call cmd,rmfiles)
1679         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1680                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1681                 -o -name '*.ko.*' \
1682                 -o -name '*.dwo'  \
1683                 -o -name '*.su'  \
1684                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1685                 -o -name '*.symtypes' -o -name 'modules.order' \
1686                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1687                 -o -name '*.c.[012]*.*' \
1688                 -o -name '*.ll' \
1689                 -o -name '*.gcno' \
1690                 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1691
1692 # Generate tags for editors
1693 # ---------------------------------------------------------------------------
1694 quiet_cmd_tags = GEN     $@
1695       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1696
1697 tags TAGS cscope gtags: FORCE
1698         $(call cmd,tags)
1699
1700 # Scripts to check various things for consistency
1701 # ---------------------------------------------------------------------------
1702
1703 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1704
1705 includecheck:
1706         find $(srctree)/* $(RCS_FIND_IGNORE) \
1707                 -name '*.[hcS]' -type f -print | sort \
1708                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1709
1710 versioncheck:
1711         find $(srctree)/* $(RCS_FIND_IGNORE) \
1712                 -name '*.[hcS]' -type f -print | sort \
1713                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1714
1715 coccicheck:
1716         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1717
1718 namespacecheck:
1719         $(PERL) $(srctree)/scripts/namespace.pl
1720
1721 export_report:
1722         $(PERL) $(srctree)/scripts/export_report.pl
1723
1724 endif #ifeq ($(config-targets),1)
1725 endif #ifeq ($(mixed-targets),1)
1726
1727 PHONY += checkstack kernelrelease kernelversion image_name
1728
1729 # UML needs a little special treatment here.  It wants to use the host
1730 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1731 # else wants $(ARCH), including people doing cross-builds, which means
1732 # that $(SUBARCH) doesn't work here.
1733 ifeq ($(ARCH), um)
1734 CHECKSTACK_ARCH := $(SUBARCH)
1735 else
1736 CHECKSTACK_ARCH := $(ARCH)
1737 endif
1738 checkstack:
1739         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1740         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1741
1742 kernelrelease:
1743         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1744
1745 kernelversion:
1746         @echo $(KERNELVERSION)
1747
1748 image_name:
1749         @echo $(KBUILD_IMAGE)
1750
1751 # Clear a bunch of variables before executing the submake
1752 tools/: FORCE
1753         $(Q)mkdir -p $(objtree)/tools
1754         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1755
1756 tools/%: FORCE
1757         $(Q)mkdir -p $(objtree)/tools
1758         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1759
1760 # Single targets
1761 # ---------------------------------------------------------------------------
1762 # Single targets are compatible with:
1763 # - build with mixed source and output
1764 # - build with separate output dir 'make O=...'
1765 # - external modules
1766 #
1767 #  target-dir => where to store outputfile
1768 #  build-dir  => directory in kernel source tree to use
1769
1770 ifeq ($(KBUILD_EXTMOD),)
1771         build-dir  = $(patsubst %/,%,$(dir $@))
1772         target-dir = $(dir $@)
1773 else
1774         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1775         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1776         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1777 endif
1778
1779 %.s: %.c prepare scripts FORCE
1780         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1781 %.i: %.c prepare scripts FORCE
1782         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1783 %.o: %.c prepare scripts FORCE
1784         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1785 %.lst: %.c prepare scripts FORCE
1786         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1787 %.s: %.S prepare scripts FORCE
1788         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1789 %.o: %.S prepare scripts FORCE
1790         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1791 %.symtypes: %.c prepare scripts FORCE
1792         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1793 %.ll: %.c prepare scripts FORCE
1794         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1795
1796 # Modules
1797 /: prepare scripts FORCE
1798         $(cmd_crmodverdir)
1799         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1800         $(build)=$(build-dir)
1801 # Make sure the latest headers are built for Documentation
1802 Documentation/ samples/: headers_install
1803 %/: prepare scripts FORCE
1804         $(cmd_crmodverdir)
1805         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1806         $(build)=$(build-dir)
1807 %.ko: prepare scripts FORCE
1808         $(cmd_crmodverdir)
1809         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1810         $(build)=$(build-dir) $(@:.ko=.o)
1811         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1812
1813 # FIXME Should go into a make.lib or something
1814 # ===========================================================================
1815
1816 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1817       cmd_rmdirs = rm -rf $(rm-dirs)
1818
1819 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1820       cmd_rmfiles = rm -f $(rm-files)
1821
1822 # Run depmod only if we have System.map and depmod is executable
1823 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1824       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1825                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1826
1827 # Create temporary dir for module support files
1828 # clean it up only when building all modules
1829 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1830                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1831
1832 # read all saved command lines
1833
1834 targets := $(wildcard $(sort $(targets)))
1835 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1836
1837 ifneq ($(cmd_files),)
1838   $(cmd_files): ;       # Do not try to update included dependency files
1839   include $(cmd_files)
1840 endif
1841
1842 endif   # skip-makefile
1843
1844 PHONY += FORCE
1845 FORCE:
1846
1847 # Declare the contents of the .PHONY variable as phony.  We keep that
1848 # information in a variable so we can use it in if_changed and friends.
1849 .PHONY: $(PHONY)