Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 15
   4 SUBLEVEL = 0
   5 EXTRAVERSION =
   6 NAME = Fearless Coyote
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.o targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Use make M=dir to specify directory of external module to build
 180 # Old syntax make ... SUBDIRS=$PWD is still supported
 181 # Setting the environment variable KBUILD_EXTMOD take precedence
 182 ifdef SUBDIRS
 183   KBUILD_EXTMOD ?= $(SUBDIRS)
 184 endif
 185
 186 ifeq ("$(origin M)", "command line")
 187   KBUILD_EXTMOD := $(M)
 188 endif
 189
 190 ifeq ($(KBUILD_SRC),)
 191         # building in the source tree
 192         srctree := .
 193 else
 194         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 195                 # building in a subdirectory of the source tree
 196                 srctree := ..
 197         else
 198                 srctree := $(KBUILD_SRC)
 199         endif
 200 endif
 201
 202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 203
 204 objtree         := .
 205 src             := $(srctree)
 206 obj             := $(objtree)
 207
 208 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 209
 210 export srctree objtree VPATH
 211
 212 # To make sure we do not include .config for any of the *config targets
 213 # catch them early, and hand them over to scripts/kconfig/Makefile
 214 # It is allowed to specify more targets when calling make, including
 215 # mixing *config targets and build targets.
 216 # For example 'make oldconfig all'.
 217 # Detect when mixed targets is specified, and make a second invocation
 218 # of make so .config is not included in this case either (for *config).
 219
 220 version_h := include/generated/uapi/linux/version.h
 221 old_version_h := include/linux/version.h
 222
 223 no-dot-config-targets := clean mrproper distclean \
 224                          cscope gtags TAGS tags help% %docs check% coccicheck \
 225                          $(version_h) headers_% archheaders archscripts \
 226                          kernelversion %src-pkg
 227
 228 config-targets := 0
 229 mixed-targets  := 0
 230 dot-config     := 1
 231
 232 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 233         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 234                 dot-config := 0
 235         endif
 236 endif
 237
 238 ifeq ($(KBUILD_EXTMOD),)
 239         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 240                 config-targets := 1
 241                 ifneq ($(words $(MAKECMDGOALS)),1)
 242                         mixed-targets := 1
 243                 endif
 244         endif
 245 endif
 246 # install and modules_install need also be processed one by one
 247 ifneq ($(filter install,$(MAKECMDGOALS)),)
 248         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 249                 mixed-targets := 1
 250         endif
 251 endif
 252
 253 ifeq ($(mixed-targets),1)
 254 # ===========================================================================
 255 # We're called with mixed targets (*config and build targets).
 256 # Handle them one by one.
 257
 258 PHONY += $(MAKECMDGOALS) __build_one_by_one
 259
 260 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 261         @:
 262
 263 __build_one_by_one:
 264         $(Q)set -e; \
 265         for i in $(MAKECMDGOALS); do \
 266                 $(MAKE) -f $(srctree)/Makefile $$i; \
 267         done
 268
 269 else
 270
 271 # We need some generic definitions (do not try to remake the file).
 272 scripts/Kbuild.include: ;
 273 include scripts/Kbuild.include
 274
 275 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 276 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 277 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 278 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 279
 280 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 281 # first, and if a usermode build is happening, the "ARCH=um" on the command
 282 # line overrides the setting of ARCH below.  If a native build is happening,
 283 # then ARCH is assigned, getting whatever value it gets normally, and
 284 # SUBARCH is subsequently ignored.
 285
 286 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 287                                   -e s/sun4u/sparc64/ \
 288                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 289                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 290                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 291                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
 292                                   -e s/riscv.*/riscv/)
 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 KCONFIG_CONFIG  ?= .config
 351 export KCONFIG_CONFIG
 352
 353 # SHELL used by kbuild
 354 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 355           else if [ -x /bin/bash ]; then echo /bin/bash; \
 356           else echo sh; fi ; fi)
 357
 358 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
 359 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
 360 HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
 361
 362 HOSTCC       = gcc
 363 HOSTCXX      = g++
 364 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 365                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 366 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 367 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 368 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 369
 370 # Make variables (CC, etc...)
 371 AS              = $(CROSS_COMPILE)as
 372 LD              = $(CROSS_COMPILE)ld
 373 CC              = $(CROSS_COMPILE)gcc
 374 CPP             = $(CC) -E
 375 AR              = $(CROSS_COMPILE)ar
 376 NM              = $(CROSS_COMPILE)nm
 377 STRIP           = $(CROSS_COMPILE)strip
 378 OBJCOPY         = $(CROSS_COMPILE)objcopy
 379 OBJDUMP         = $(CROSS_COMPILE)objdump
 380 AWK             = awk
 381 GENKSYMS        = scripts/genksyms/genksyms
 382 INSTALLKERNEL  := installkernel
 383 DEPMOD          = /sbin/depmod
 384 PERL            = perl
 385 PYTHON          = python
 386 CHECK           = sparse
 387
 388 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 389                   -Wbitwise -Wno-return-void $(CF)
 390 NOSTDINC_FLAGS  =
 391 CFLAGS_MODULE   =
 392 AFLAGS_MODULE   =
 393 LDFLAGS_MODULE  =
 394 CFLAGS_KERNEL   =
 395 AFLAGS_KERNEL   =
 396 LDFLAGS_vmlinux =
 397
 398 # Prefer linux-backports-modules
 399 ifneq ($(KBUILD_SRC),)
 400 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
 401 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
 402 endif
 403 endif
 404
 405 # Use USERINCLUDE when you must reference the UAPI directories only.
 406 USERINCLUDE    := \
 407                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 408                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 409                 -I$(srctree)/include/uapi \
 410                 -I$(objtree)/include/generated/uapi \
 411                 -include $(srctree)/include/linux/kconfig.h
 412
 413 # Use LINUXINCLUDE when you must reference the include/ directory.
 414 # Needed to be compatible with the O= option
 415 LINUXINCLUDE    := \
 416                 $(UBUNTUINCLUDE) \
 417                 -I$(srctree)/arch/$(SRCARCH)/include \
 418                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 419                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 420                 -I$(objtree)/include \
 421                 $(USERINCLUDE)
 422
 423 # UBUNTU: Include our third party driver stuff too
 424 LINUXINCLUDE   += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
 425
 426 KBUILD_AFLAGS   := -D__ASSEMBLY__
 427 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 428                    -fno-strict-aliasing -fno-common -fshort-wchar \
 429                    -Werror-implicit-function-declaration \
 430                    -Wno-format-security \
 431                    -std=gnu89
 432 KBUILD_CPPFLAGS := -D__KERNEL__
 433 KBUILD_AFLAGS_KERNEL :=
 434 KBUILD_CFLAGS_KERNEL :=
 435 KBUILD_AFLAGS_MODULE  := -DMODULE
 436 KBUILD_CFLAGS_MODULE  := -DMODULE
 437 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 438 GCC_PLUGINS_CFLAGS :=
 439
 440 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 441 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 442 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 443 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 444
 445 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 446 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_KASAN 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 ($(CROSS_COMPILE),)
 490 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 491 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 492 endif
 493 ifneq ($(GCC_TOOLCHAIN),)
 494 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 495 endif
 496 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 497 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 498 endif
 499
 500 ifeq ($(config-targets),1)
 501 # ===========================================================================
 502 # *config targets only - make sure prerequisites are updated, and descend
 503 # in scripts/kconfig to make the *config target
 504
 505 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 506 # KBUILD_DEFCONFIG may point out an alternative default configuration
 507 # used for 'make defconfig'
 508 include arch/$(SRCARCH)/Makefile
 509 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 510
 511 config: scripts_basic outputmakefile FORCE
 512         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 513
 514 %config: scripts_basic outputmakefile FORCE
 515         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 516
 517 else
 518 # ===========================================================================
 519 # Build targets only - this includes vmlinux, arch specific targets, clean
 520 # targets and others. In general all targets except *config targets.
 521
 522 # If building an external module we do not care about the all: rule
 523 # but instead _all depend on modules
 524 PHONY += all
 525 ifeq ($(KBUILD_EXTMOD),)
 526 _all: all
 527 else
 528 _all: modules
 529 endif
 530
 531 # Decide whether to build built-in, modular, or both.
 532 # Normally, just do built-in.
 533
 534 KBUILD_MODULES :=
 535 KBUILD_BUILTIN := 1
 536
 537 # If we have only "make modules", don't compile built-in objects.
 538 # When we're building modules with modversions, we need to consider
 539 # the built-in objects during the descend as well, in order to
 540 # make sure the checksums are up to date before we record them.
 541
 542 ifeq ($(MAKECMDGOALS),modules)
 543   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 544 endif
 545
 546 # If we have "make <whatever> modules", compile modules
 547 # in addition to whatever we do anyway.
 548 # Just "make" or "make all" shall build modules as well
 549
 550 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 551   KBUILD_MODULES := 1
 552 endif
 553
 554 ifeq ($(MAKECMDGOALS),)
 555   KBUILD_MODULES := 1
 556 endif
 557
 558 export KBUILD_MODULES KBUILD_BUILTIN
 559
 560 ifeq ($(KBUILD_EXTMOD),)
 561 # Additional helpers built in scripts/
 562 # Carefully list dependencies so we do not try to build scripts twice
 563 # in parallel
 564 PHONY += scripts
 565 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 566          asm-generic gcc-plugins
 567         $(Q)$(MAKE) $(build)=$(@)
 568
 569 # Objects we will link into vmlinux / subdirs we need to visit
 570 init-y          := init/
 571 drivers-y       := drivers/ sound/ firmware/ ubuntu/
 572 net-y           := net/
 573 libs-y          := lib/
 574 core-y          := usr/
 575 virt-y          := virt/
 576 endif # KBUILD_EXTMOD
 577
 578 ifeq ($(dot-config),1)
 579 # Read in config
 580 -include include/config/auto.conf
 581
 582 ifeq ($(KBUILD_EXTMOD),)
 583 # Read in dependencies to all Kconfig* files, make sure to run
 584 # oldconfig if changes are detected.
 585 -include include/config/auto.conf.cmd
 586
 587 # To avoid any implicit rule to kick in, define an empty command
 588 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 589
 590 # If .config is newer than include/config/auto.conf, someone tinkered
 591 # with it and forgot to run make oldconfig.
 592 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 593 # we execute the config step to be sure to catch updated Kconfig files
 594 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 595         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 596 else
 597 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 598 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 599 PHONY += include/config/auto.conf
 600
 601 include/config/auto.conf:
 602         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 603         echo >&2;                                                       \
 604         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 605         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 606         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 607         echo >&2 ;                                                      \
 608         /bin/false)
 609
 610 endif # KBUILD_EXTMOD
 611
 612 else
 613 # Dummy target needed, because used as prerequisite
 614 include/config/auto.conf: ;
 615 endif # $(dot-config)
 616
 617 # For the kernel to actually contain only the needed exported symbols,
 618 # we have to build modules as well to determine what those symbols are.
 619 # (this can be evaluated only once include/config/auto.conf has been included)
 620 ifdef CONFIG_TRIM_UNUSED_KSYMS
 621   KBUILD_MODULES := 1
 622 endif
 623
 624 # The all: target is the default when no target is given on the
 625 # command line.
 626 # This allow a user to issue only 'make' to build a kernel including modules
 627 # Defaults to vmlinux, but the arch makefile usually adds further targets
 628 all: vmlinux
 629
 630 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 631 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 632 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 633 export CFLAGS_GCOV CFLAGS_KCOV
 634
 635 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 636 # values of the respective KBUILD_* variables
 637 ARCH_CPPFLAGS :=
 638 ARCH_AFLAGS :=
 639 ARCH_CFLAGS :=
 640 include arch/$(SRCARCH)/Makefile
 641
 642 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 643 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 644 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 645 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 646 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 647
 648 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 649 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 650 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 651 else
 652 ifdef CONFIG_PROFILE_ALL_BRANCHES
 653 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 654 else
 655 KBUILD_CFLAGS   += -O2
 656 endif
 657 endif
 658
 659 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 660                         $(call cc-disable-warning,maybe-uninitialized,))
 661
 662 # Tell gcc to never replace conditional load with a non-conditional one
 663 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 664
 665 # check for 'asm goto'
 666 ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 667         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 668         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 669 endif
 670
 671 include scripts/Makefile.kcov
 672 include scripts/Makefile.gcc-plugins
 673
 674 ifdef CONFIG_READABLE_ASM
 675 # Disable optimizations that make assembler listings hard to read.
 676 # reorder blocks reorders the control in the function
 677 # ipa clone creates specialized cloned functions
 678 # partial inlining inlines only parts of functions
 679 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 680                  $(call cc-option,-fno-ipa-cp-clone,) \
 681                  $(call cc-option,-fno-partial-inlining)
 682 endif
 683
 684 ifneq ($(CONFIG_FRAME_WARN),0)
 685 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 686 endif
 687
 688 # This selects the stack protector compiler flag. Testing it is delayed
 689 # until after .config has been reprocessed, in the prepare-compiler-check
 690 # target.
 691 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 692   stackp-flag := -fstack-protector
 693   stackp-name := REGULAR
 694 else
 695 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 696   stackp-flag := -fstack-protector-strong
 697   stackp-name := STRONG
 698 else
 699   # Force off for distro compilers that enable stack protector by default.
 700   stackp-flag := $(call cc-option, -fno-stack-protector)
 701 endif
 702 endif
 703 # Find arch-specific stack protector compiler sanity-checking script.
 704 ifdef CONFIG_CC_STACKPROTECTOR
 705   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 706   stackp-check := $(wildcard $(stackp-path))
 707 endif
 708 KBUILD_CFLAGS += $(stackp-flag)
 709
 710 ifeq ($(cc-name),clang)
 711 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 712 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 713 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 714 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 715 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 716 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 717 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 718 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 719 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 720 # See modpost pattern 2
 721 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 722 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 723 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 724 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 725 else
 726
 727 # These warnings generated too much noise in a regular build.
 728 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 729 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 730 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 731 endif
 732
 733 ifdef CONFIG_FRAME_POINTER
 734 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 735 else
 736 # Some targets (ARM with Thumb2, for example), can't be built with frame
 737 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 738 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 739 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 740 # -fomit-frame-pointer with FUNCTION_TRACER.
 741 ifndef CONFIG_FUNCTION_TRACER
 742 KBUILD_CFLAGS   += -fomit-frame-pointer
 743 endif
 744 endif
 745
 746 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 747
 748 ifdef CONFIG_DEBUG_INFO
 749 ifdef CONFIG_DEBUG_INFO_SPLIT
 750 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 751 else
 752 KBUILD_CFLAGS   += -g
 753 endif
 754 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 755 endif
 756 ifdef CONFIG_DEBUG_INFO_DWARF4
 757 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 758 endif
 759
 760 ifdef CONFIG_DEBUG_INFO_REDUCED
 761 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 762                    $(call cc-option,-fno-var-tracking)
 763 endif
 764
 765 ifdef CONFIG_FUNCTION_TRACER
 766 ifndef CC_FLAGS_FTRACE
 767 CC_FLAGS_FTRACE := -pg
 768 endif
 769 export CC_FLAGS_FTRACE
 770 ifdef CONFIG_HAVE_FENTRY
 771 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 772 endif
 773 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 774 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 775 ifdef CONFIG_DYNAMIC_FTRACE
 776         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 777                 BUILD_C_RECORDMCOUNT := y
 778                 export BUILD_C_RECORDMCOUNT
 779         endif
 780 endif
 781 endif
 782
 783 # We trigger additional mismatches with less inlining
 784 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 785 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 786 endif
 787
 788 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 789 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 790 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 791 endif
 792
 793 # arch Makefile may override CC so keep this after arch Makefile is included
 794 NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
 795 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 796
 797 # warn about C99 declaration after statement
 798 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 799
 800 # disable pointer signed / unsigned warnings in gcc 4.0
 801 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 802
 803 # disable invalid "can't wrap" optimizations for signed / pointers
 804 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 805
 806 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 807 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 808
 809 # conserve stack if available
 810 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 811
 812 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 813 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 814
 815 # require functions to have arguments in prototypes, not empty 'int foo()'
 816 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 817
 818 # Prohibit date/time macros, which would make the build non-deterministic
 819 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 820
 821 # enforce correct pointer usage
 822 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 823
 824 # Require designated initializers for all marked structures
 825 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 826
 827 # use the deterministic mode of AR if available
 828 KBUILD_ARFLAGS := $(call ar-option,D)
 829
 830 include scripts/Makefile.kasan
 831 include scripts/Makefile.extrawarn
 832 include scripts/Makefile.ubsan
 833
 834 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 835 # last assignments
 836 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 837 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 838 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 839
 840 # Use --build-id when available.
 841 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 842                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 843 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 844 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 845
 846 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 847 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 848 endif
 849
 850 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 851 LDFLAGS_vmlinux += $(call ld-option, -X,)
 852 endif
 853
 854 # Default kernel image to build when no specific target is given.
 855 # KBUILD_IMAGE may be overruled on the command line or
 856 # set in the environment
 857 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 858 # this default value
 859 export KBUILD_IMAGE ?= vmlinux
 860
 861 #
 862 # INSTALL_PATH specifies where to place the updated kernel and system map
 863 # images. Default is /boot, but you can set it to other values
 864 export  INSTALL_PATH ?= /boot
 865
 866 #
 867 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 868 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 869 # an argument if needed. Otherwise it defaults to the kernel install path
 870 #
 871 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 872
 873 #
 874 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 875 # relocations required by build roots.  This is not defined in the
 876 # makefile but the argument can be passed to make if needed.
 877 #
 878
 879 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 880 export MODLIB
 881
 882 #
 883 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 884 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 885 # the default option --strip-debug will be used.  Otherwise,
 886 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 887
 888 ifdef INSTALL_MOD_STRIP
 889 ifeq ($(INSTALL_MOD_STRIP),1)
 890 mod_strip_cmd = $(STRIP) --strip-debug
 891 else
 892 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 893 endif # INSTALL_MOD_STRIP=1
 894 else
 895 mod_strip_cmd = true
 896 endif # INSTALL_MOD_STRIP
 897 export mod_strip_cmd
 898
 899 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 900 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 901 # or CONFIG_MODULE_COMPRESS_XZ.
 902
 903 mod_compress_cmd = true
 904 ifdef CONFIG_MODULE_COMPRESS
 905   ifdef CONFIG_MODULE_COMPRESS_GZIP
 906     mod_compress_cmd = gzip -n -f
 907   endif # CONFIG_MODULE_COMPRESS_GZIP
 908   ifdef CONFIG_MODULE_COMPRESS_XZ
 909     mod_compress_cmd = xz -f
 910   endif # CONFIG_MODULE_COMPRESS_XZ
 911 endif # CONFIG_MODULE_COMPRESS
 912 export mod_compress_cmd
 913
 914 # Select initial ramdisk compression format, default is gzip(1).
 915 # This shall be used by the dracut(8) tool while creating an initramfs image.
 916 #
 917 INITRD_COMPRESS-y                  := gzip
 918 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 919 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 920 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 921 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 922 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 923 # do not export INITRD_COMPRESS, since we didn't actually
 924 # choose a sane default compression above.
 925 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 926
 927 ifdef CONFIG_MODULE_SIG_ALL
 928 $(eval $(call config_filename,MODULE_SIG_KEY))
 929
 930 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 931 else
 932 mod_sign_cmd = true
 933 endif
 934 export mod_sign_cmd
 935
 936 ifdef CONFIG_STACK_VALIDATION
 937   has_libelf := $(call try-run,\
 938                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 939   ifeq ($(has_libelf),1)
 940     objtool_target := tools/objtool FORCE
 941   else
 942     ifdef CONFIG_UNWINDER_ORC
 943       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 944     else
 945       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 946     endif
 947     SKIP_STACK_VALIDATION := 1
 948     export SKIP_STACK_VALIDATION
 949   endif
 950 endif
 951
 952
 953 ifeq ($(KBUILD_EXTMOD),)
 954 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 955
 956 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 957                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 958                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 959
 960 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 961                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 962
 963 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 964 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 965 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 966 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 967 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 968 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
 969 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 970
 971 # Externally visible symbols (used by link-vmlinux.sh)
 972 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 973 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 974 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 975 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 976 export LDFLAGS_vmlinux
 977 # used by scripts/package/Makefile
 978 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 979
 980 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 981
 982 # Include targets which we want to execute sequentially if the rest of the
 983 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 984 # evaluated more than once.
 985 PHONY += vmlinux_prereq
 986 vmlinux_prereq: $(vmlinux-deps) FORCE
 987 ifdef CONFIG_HEADERS_CHECK
 988         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 989 endif
 990 ifdef CONFIG_GDB_SCRIPTS
 991         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
 992 endif
 993 ifdef CONFIG_TRIM_UNUSED_KSYMS
 994         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 995           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 996 endif
 997
 998 # standalone target for easier testing
 999 include/generated/autoksyms.h: FORCE
1000         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1001
1002 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1003
1004 # Final link of vmlinux with optional arch pass after final link
1005 cmd_link-vmlinux =                                                 \
1006         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1007         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1008
1009 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1010         +$(call if_changed,link-vmlinux)
1011
1012 # Build samples along the rest of the kernel
1013 ifdef CONFIG_SAMPLES
1014 vmlinux-dirs += samples
1015 endif
1016
1017 # The actual objects are generated when descending,
1018 # make sure no implicit rule kicks in
1019 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1020
1021 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1022 # Preset locale variables to speed up the build process. Limit locale
1023 # tweaks to this spot to avoid wrong language settings when running
1024 # make menuconfig etc.
1025 # Error messages still appears in the original language
1026
1027 PHONY += $(vmlinux-dirs)
1028 $(vmlinux-dirs): prepare scripts
1029         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1030
1031 define filechk_kernel.release
1032         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1033 endef
1034
1035 # Store (new) KERNELRELEASE string in include/config/kernel.release
1036 include/config/kernel.release: include/config/auto.conf FORCE
1037         $(call filechk,kernel.release)
1038
1039
1040 # Things we need to do before we recursively start building the kernel
1041 # or the modules are listed in "prepare".
1042 # A multi level approach is used. prepareN is processed before prepareN-1.
1043 # archprepare is used in arch Makefiles and when processed asm symlink,
1044 # version.h and scripts_basic is processed / created.
1045
1046 # Listed in dependency order
1047 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1048
1049 # prepare3 is used to check if we are building in a separate output directory,
1050 # and if so do:
1051 # 1) Check that make has not been executed in the kernel src $(srctree)
1052 prepare3: include/config/kernel.release
1053 ifneq ($(KBUILD_SRC),)
1054         @$(kecho) '  Using $(srctree) as source for kernel'
1055         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1056                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1057                 echo >&2 "  in the '$(srctree)' directory.";\
1058                 /bin/false; \
1059         fi;
1060 endif
1061
1062 # prepare2 creates a makefile if using a separate output directory.
1063 # From this point forward, .config has been reprocessed, so any rules
1064 # that need to depend on updated CONFIG_* values can be checked here.
1065 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1066
1067 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1068                    include/config/auto.conf
1069         $(cmd_crmodverdir)
1070
1071 archprepare: archheaders archscripts prepare1 scripts_basic
1072
1073 prepare0: archprepare gcc-plugins
1074         $(Q)$(MAKE) $(build)=.
1075
1076 # All the preparing..
1077 prepare: prepare0 prepare-objtool
1078
1079 # Support for using generic headers in asm-generic
1080 PHONY += asm-generic uapi-asm-generic
1081 asm-generic: uapi-asm-generic
1082         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1083                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1084 uapi-asm-generic:
1085         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1086                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1087
1088 PHONY += prepare-objtool
1089 prepare-objtool: $(objtool_target)
1090
1091 # Check for CONFIG flags that require compiler support. Abort the build
1092 # after .config has been processed, but before the kernel build starts.
1093 #
1094 # For security-sensitive CONFIG options, we don't want to fallback and/or
1095 # silently change which compiler flags will be used, since that leads to
1096 # producing kernels with different security feature characteristics
1097 # depending on the compiler used. (For example, "But I selected
1098 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1099 PHONY += prepare-compiler-check
1100 prepare-compiler-check: FORCE
1101 # Make sure compiler supports requested stack protector flag.
1102 ifdef stackp-name
1103   ifeq ($(call cc-option, $(stackp-flag)),)
1104         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1105                   $(stackp-flag) not supported by compiler >&2 && exit 1
1106   endif
1107 endif
1108 # Make sure compiler does not have buggy stack-protector support.
1109 ifdef stackp-check
1110   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1111         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1112                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1113   endif
1114 endif
1115         @:
1116
1117 # Generate some files
1118 # ---------------------------------------------------------------------------
1119
1120 # KERNELRELEASE can change from a few different places, meaning version.h
1121 # needs to be updated, so this check is forced on all builds
1122
1123 uts_len := 64
1124 define filechk_utsrelease.h
1125         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1126           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1127           exit 1;                                                         \
1128         fi;                                                               \
1129         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1130 endef
1131
1132 define filechk_version.h
1133         (echo \#define LINUX_VERSION_CODE $(shell                         \
1134         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1135         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1136 endef
1137
1138 $(version_h): $(srctree)/Makefile FORCE
1139         $(call filechk,version.h)
1140         $(Q)rm -f $(old_version_h)
1141
1142 include/generated/utsrelease.h: include/config/kernel.release FORCE
1143         $(call filechk,utsrelease.h)
1144
1145 PHONY += headerdep
1146 headerdep:
1147         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1148         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1149
1150 # ---------------------------------------------------------------------------
1151 # Kernel headers
1152
1153 #Default location for installed headers
1154 export INSTALL_HDR_PATH = $(objtree)/usr
1155
1156 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1157 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1158
1159 PHONY += archheaders
1160 archheaders:
1161
1162 PHONY += archscripts
1163 archscripts:
1164
1165 PHONY += __headers
1166 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1167         $(Q)$(MAKE) $(build)=scripts build_unifdef
1168
1169 PHONY += headers_install_all
1170 headers_install_all:
1171         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1172
1173 PHONY += headers_install
1174 headers_install: __headers
1175         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1176           $(error Headers not exportable for the $(SRCARCH) architecture))
1177         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1178         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1179
1180 PHONY += headers_check_all
1181 headers_check_all: headers_install_all
1182         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1183
1184 PHONY += headers_check
1185 headers_check: headers_install
1186         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1187         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1188
1189 # ---------------------------------------------------------------------------
1190 # Kernel selftest
1191
1192 PHONY += kselftest
1193 kselftest:
1194         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1195
1196 PHONY += kselftest-clean
1197 kselftest-clean:
1198         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1199
1200 PHONY += kselftest-merge
1201 kselftest-merge:
1202         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1203         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1204                 -m $(objtree)/.config \
1205                 $(srctree)/tools/testing/selftests/*/config
1206         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1207
1208 # ---------------------------------------------------------------------------
1209 # Modules
1210
1211 ifdef CONFIG_MODULES
1212
1213 # By default, build modules as well
1214
1215 all: modules
1216
1217 # Build modules
1218 #
1219 # A module can be listed more than once in obj-m resulting in
1220 # duplicate lines in modules.order files.  Those are removed
1221 # using awk while concatenating to the final file.
1222
1223 PHONY += modules
1224 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1225         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1226         @$(kecho) '  Building modules, stage 2.';
1227         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1228
1229 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1230         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1231
1232 %/modules.builtin: include/config/auto.conf
1233         $(Q)$(MAKE) $(modbuiltin)=$*
1234
1235
1236 # Target to prepare building external modules
1237 PHONY += modules_prepare
1238 modules_prepare: prepare scripts
1239
1240 # Target to install modules
1241 PHONY += modules_install
1242 modules_install: _modinst_ _modinst_post
1243
1244 PHONY += _modinst_
1245 _modinst_:
1246         @rm -rf $(MODLIB)/kernel
1247         @rm -f $(MODLIB)/source
1248         @mkdir -p $(MODLIB)/kernel
1249         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1250         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1251                 rm -f $(MODLIB)/build ; \
1252                 ln -s $(CURDIR) $(MODLIB)/build ; \
1253         fi
1254         @cp -f $(objtree)/modules.order $(MODLIB)/
1255         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1256         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1257
1258 # This depmod is only for convenience to give the initial
1259 # boot a modules.dep even before / is mounted read-write.  However the
1260 # boot script depmod is the master version.
1261 PHONY += _modinst_post
1262 _modinst_post: _modinst_
1263         $(call cmd,depmod)
1264
1265 ifeq ($(CONFIG_MODULE_SIG), y)
1266 PHONY += modules_sign
1267 modules_sign:
1268         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1269 endif
1270
1271 else # CONFIG_MODULES
1272
1273 # Modules not configured
1274 # ---------------------------------------------------------------------------
1275
1276 PHONY += modules modules_install
1277 modules modules_install:
1278         @echo >&2
1279         @echo >&2 "The present kernel configuration has modules disabled."
1280         @echo >&2 "Type 'make config' and enable loadable module support."
1281         @echo >&2 "Then build a kernel with module support enabled."
1282         @echo >&2
1283         @exit 1
1284
1285 endif # CONFIG_MODULES
1286
1287 ###
1288 # Cleaning is done on three levels.
1289 # make clean     Delete most generated files
1290 #                Leave enough to build external modules
1291 # make mrproper  Delete the current configuration, and all generated files
1292 # make distclean Remove editor backup files, patch leftover files and the like
1293
1294 # Directories & files removed with 'make clean'
1295 CLEAN_DIRS  += $(MODVERDIR)
1296
1297 # Directories & files removed with 'make mrproper'
1298 MRPROPER_DIRS  += include/config usr/include include/generated          \
1299                   arch/*/include/generated .tmp_objdiff
1300 MRPROPER_FILES += .config .config.old .version \
1301                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1302                   signing_key.pem signing_key.priv signing_key.x509     \
1303                   x509.genkey extra_certificates signing_key.x509.keyid \
1304                   signing_key.x509.signer vmlinux-gdb.py
1305
1306 # clean - Delete most, but leave enough to build external modules
1307 #
1308 clean: rm-dirs  := $(CLEAN_DIRS)
1309 clean: rm-files := $(CLEAN_FILES)
1310 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1311
1312 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1313 $(clean-dirs):
1314         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1315
1316 vmlinuxclean:
1317         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1318         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1319
1320 clean: archclean vmlinuxclean
1321
1322 # mrproper - Delete all generated files, including .config
1323 #
1324 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1325 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1326 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1327
1328 PHONY += $(mrproper-dirs) mrproper archmrproper
1329 $(mrproper-dirs):
1330         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1331
1332 mrproper: clean archmrproper $(mrproper-dirs)
1333         $(call cmd,rmdirs)
1334         $(call cmd,rmfiles)
1335
1336 # distclean
1337 #
1338 PHONY += distclean
1339
1340 distclean: mrproper
1341         @find $(srctree) $(RCS_FIND_IGNORE) \
1342                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1343                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1344                 -o -name 'core' \) \
1345                 -type f -print | xargs rm -f
1346
1347
1348 # Packaging of the kernel to various formats
1349 # ---------------------------------------------------------------------------
1350 # rpm target kept for backward compatibility
1351 package-dir     := scripts/package
1352
1353 %src-pkg: FORCE
1354         $(Q)$(MAKE) $(build)=$(package-dir) $@
1355 %pkg: include/config/kernel.release FORCE
1356         $(Q)$(MAKE) $(build)=$(package-dir) $@
1357 rpm: rpm-pkg
1358         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1359         @echo "           Please use \"rpm-pkg\" instead."
1360
1361
1362 # Brief documentation of the typical targets used
1363 # ---------------------------------------------------------------------------
1364
1365 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1366 boards := $(sort $(notdir $(boards)))
1367 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1368 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1369
1370 PHONY += help
1371 help:
1372         @echo  'Cleaning targets:'
1373         @echo  '  clean           - Remove most generated files but keep the config and'
1374         @echo  '                    enough build support to build external modules'
1375         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1376         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1377         @echo  ''
1378         @echo  'Configuration targets:'
1379         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1380         @echo  ''
1381         @echo  'Other generic targets:'
1382         @echo  '  all             - Build all targets marked with [*]'
1383         @echo  '* vmlinux         - Build the bare kernel'
1384         @echo  '* modules         - Build all modules'
1385         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1386         @echo  '  dir/            - Build all files in dir and below'
1387         @echo  '  dir/file.[ois]  - Build specified target only'
1388         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1389         @echo  '                    (requires compiler support for LLVM assembly generation)'
1390         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1391         @echo  '                    (requires a recent binutils and recent build (System.map))'
1392         @echo  '  dir/file.ko     - Build module including final link'
1393         @echo  '  modules_prepare - Set up for building external modules'
1394         @echo  '  tags/TAGS       - Generate tags file for editors'
1395         @echo  '  cscope          - Generate cscope index'
1396         @echo  '  gtags           - Generate GNU GLOBAL index'
1397         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1398         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1399         @echo  '  image_name      - Output the image name (use with make -s)'
1400         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1401          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1402          echo  ''
1403         @echo  'Static analysers:'
1404         @echo  '  checkstack      - Generate a list of stack hogs'
1405         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1406         @echo  '  versioncheck    - Sanity check on version.h usage'
1407         @echo  '  includecheck    - Check for duplicate included header files'
1408         @echo  '  export_report   - List the usages of all exported symbols'
1409         @echo  '  headers_check   - Sanity check on exported headers'
1410         @echo  '  headerdep       - Detect inclusion cycles in headers'
1411         @echo  '  coccicheck      - Check with Coccinelle'
1412         @echo  ''
1413         @echo  'Kernel selftest:'
1414         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1415         @echo  '                    Build, install, and boot kernel before'
1416         @echo  '                    running kselftest on it'
1417         @echo  '  kselftest-clean - Remove all generated kselftest files'
1418         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1419         @echo  '                    .config.'
1420         @echo  ''
1421         @echo 'Userspace tools targets:'
1422         @echo '  use "make tools/help"'
1423         @echo '  or  "cd tools; make help"'
1424         @echo  ''
1425         @echo  'Kernel packaging:'
1426         @$(MAKE) $(build)=$(package-dir) help
1427         @echo  ''
1428         @echo  'Documentation targets:'
1429         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1430         @echo  ''
1431         @echo  'Architecture specific targets ($(SRCARCH)):'
1432         @$(if $(archhelp),$(archhelp),\
1433                 echo '  No architecture specific help defined for $(SRCARCH)')
1434         @echo  ''
1435         @$(if $(boards), \
1436                 $(foreach b, $(boards), \
1437                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1438                 echo '')
1439         @$(if $(board-dirs), \
1440                 $(foreach b, $(board-dirs), \
1441                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1442                 printf "  %-16s - Show all of the above\\n" help-boards; \
1443                 echo '')
1444
1445         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1446         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1447         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1448         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1449         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1450         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1451         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1452         @echo  '                1: warnings which may be relevant and do not occur too often'
1453         @echo  '                2: warnings which occur quite often but may still be relevant'
1454         @echo  '                3: more obscure warnings, can most likely be ignored'
1455         @echo  '                Multiple levels can be combined with W=12 or W=123'
1456         @echo  ''
1457         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1458         @echo  'For further info see the ./README file'
1459
1460
1461 help-board-dirs := $(addprefix help-,$(board-dirs))
1462
1463 help-boards: $(help-board-dirs)
1464
1465 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1466
1467 $(help-board-dirs): help-%:
1468         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1469         @$(if $(boards-per-dir), \
1470                 $(foreach b, $(boards-per-dir), \
1471                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1472                 echo '')
1473
1474
1475 # Documentation targets
1476 # ---------------------------------------------------------------------------
1477 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1478                linkcheckdocs dochelp refcheckdocs
1479 PHONY += $(DOC_TARGETS)
1480 $(DOC_TARGETS): scripts_basic FORCE
1481         $(Q)$(MAKE) $(build)=Documentation $@
1482
1483 else # KBUILD_EXTMOD
1484
1485 ###
1486 # External module support.
1487 # When building external modules the kernel used as basis is considered
1488 # read-only, and no consistency checks are made and the make
1489 # system is not used on the basis kernel. If updates are required
1490 # in the basis kernel ordinary make commands (without M=...) must
1491 # be used.
1492 #
1493 # The following are the only valid targets when building external
1494 # modules.
1495 # make M=dir clean     Delete all automatically generated files
1496 # make M=dir modules   Make all modules in specified dir
1497 # make M=dir           Same as 'make M=dir modules'
1498 # make M=dir modules_install
1499 #                      Install the modules built in the module directory
1500 #                      Assumes install directory is already created
1501
1502 # We are always building modules
1503 KBUILD_MODULES := 1
1504 PHONY += crmodverdir
1505 crmodverdir:
1506         $(cmd_crmodverdir)
1507
1508 PHONY += $(objtree)/Module.symvers
1509 $(objtree)/Module.symvers:
1510         @test -e $(objtree)/Module.symvers || ( \
1511         echo; \
1512         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1513         echo "           is missing; modules will have no dependencies and modversions."; \
1514         echo )
1515
1516 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1517 PHONY += $(module-dirs) modules
1518 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1519         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1520
1521 modules: $(module-dirs)
1522         @$(kecho) '  Building modules, stage 2.';
1523         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1524
1525 PHONY += modules_install
1526 modules_install: _emodinst_ _emodinst_post
1527
1528 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1529 PHONY += _emodinst_
1530 _emodinst_:
1531         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1532         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1533
1534 PHONY += _emodinst_post
1535 _emodinst_post: _emodinst_
1536         $(call cmd,depmod)
1537
1538 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1539
1540 PHONY += $(clean-dirs) clean
1541 $(clean-dirs):
1542         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1543
1544 clean:  rm-dirs := $(MODVERDIR)
1545 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1546
1547 PHONY += help
1548 help:
1549         @echo  '  Building external modules.'
1550         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1551         @echo  ''
1552         @echo  '  modules         - default target, build the module(s)'
1553         @echo  '  modules_install - install the module'
1554         @echo  '  clean           - remove generated files in module directory only'
1555         @echo  ''
1556
1557 # Dummies...
1558 PHONY += prepare scripts
1559 prepare: ;
1560 scripts: ;
1561 endif # KBUILD_EXTMOD
1562
1563 clean: $(clean-dirs)
1564         $(call cmd,rmdirs)
1565         $(call cmd,rmfiles)
1566         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1567                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1568                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1569                 -o -name '*.dwo' -o -name '*.lst' \
1570                 -o -name '*.su'  \
1571                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1572                 -o -name '*.symtypes' -o -name 'modules.order' \
1573                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1574                 -o -name .cache.mk \
1575                 -o -name '*.c.[012]*.*' \
1576                 -o -name '*.ll' \
1577                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1578
1579 # Generate tags for editors
1580 # ---------------------------------------------------------------------------
1581 quiet_cmd_tags = GEN     $@
1582       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1583
1584 tags TAGS cscope gtags: FORCE
1585         $(call cmd,tags)
1586
1587 # Scripts to check various things for consistency
1588 # ---------------------------------------------------------------------------
1589
1590 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1591
1592 includecheck:
1593         find $(srctree)/* $(RCS_FIND_IGNORE) \
1594                 -name '*.[hcS]' -type f -print | sort \
1595                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1596
1597 versioncheck:
1598         find $(srctree)/* $(RCS_FIND_IGNORE) \
1599                 -name '*.[hcS]' -type f -print | sort \
1600                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1601
1602 coccicheck:
1603         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1604
1605 namespacecheck:
1606         $(PERL) $(srctree)/scripts/namespace.pl
1607
1608 export_report:
1609         $(PERL) $(srctree)/scripts/export_report.pl
1610
1611 endif #ifeq ($(config-targets),1)
1612 endif #ifeq ($(mixed-targets),1)
1613
1614 PHONY += checkstack kernelrelease kernelversion image_name
1615
1616 # UML needs a little special treatment here.  It wants to use the host
1617 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1618 # else wants $(ARCH), including people doing cross-builds, which means
1619 # that $(SUBARCH) doesn't work here.
1620 ifeq ($(ARCH), um)
1621 CHECKSTACK_ARCH := $(SUBARCH)
1622 else
1623 CHECKSTACK_ARCH := $(ARCH)
1624 endif
1625 checkstack:
1626         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1627         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1628
1629 kernelrelease:
1630         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1631
1632 kernelversion:
1633         @echo $(KERNELVERSION)
1634
1635 image_name:
1636         @echo $(KBUILD_IMAGE)
1637
1638 # Clear a bunch of variables before executing the submake
1639 tools/: FORCE
1640         $(Q)mkdir -p $(objtree)/tools
1641         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1642
1643 tools/%: FORCE
1644         $(Q)mkdir -p $(objtree)/tools
1645         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1646
1647 # Single targets
1648 # ---------------------------------------------------------------------------
1649 # Single targets are compatible with:
1650 # - build with mixed source and output
1651 # - build with separate output dir 'make O=...'
1652 # - external modules
1653 #
1654 #  target-dir => where to store outputfile
1655 #  build-dir  => directory in kernel source tree to use
1656
1657 ifeq ($(KBUILD_EXTMOD),)
1658         build-dir  = $(patsubst %/,%,$(dir $@))
1659         target-dir = $(dir $@)
1660 else
1661         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1662         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1663         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1664 endif
1665
1666 %.s: %.c prepare scripts FORCE
1667         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1668 %.i: %.c prepare scripts FORCE
1669         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1670 %.o: %.c prepare scripts FORCE
1671         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1672 %.lst: %.c prepare scripts FORCE
1673         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1674 %.s: %.S prepare scripts FORCE
1675         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1676 %.o: %.S prepare scripts FORCE
1677         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1678 %.symtypes: %.c prepare scripts FORCE
1679         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1680 %.ll: %.c prepare scripts FORCE
1681         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1682
1683 # Modules
1684 /: prepare scripts FORCE
1685         $(cmd_crmodverdir)
1686         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1687         $(build)=$(build-dir)
1688 # Make sure the latest headers are built for Documentation
1689 Documentation/ samples/: headers_install
1690 %/: prepare scripts FORCE
1691         $(cmd_crmodverdir)
1692         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1693         $(build)=$(build-dir)
1694 %.ko: prepare scripts FORCE
1695         $(cmd_crmodverdir)
1696         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1697         $(build)=$(build-dir) $(@:.ko=.o)
1698         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1699
1700 # FIXME Should go into a make.lib or something
1701 # ===========================================================================
1702
1703 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1704       cmd_rmdirs = rm -rf $(rm-dirs)
1705
1706 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1707       cmd_rmfiles = rm -f $(rm-files)
1708
1709 # Run depmod only if we have System.map and depmod is executable
1710 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1711       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1712                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1713
1714 # Create temporary dir for module support files
1715 # clean it up only when building all modules
1716 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1717                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1718
1719 # read all saved command lines
1720
1721 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1722
1723 ifneq ($(cmd_files),)
1724   $(cmd_files): ;       # Do not try to update included dependency files
1725   include $(cmd_files)
1726 endif
1727
1728 endif   # skip-makefile
1729
1730 PHONY += FORCE
1731 FORCE:
1732
1733 # Declare the contents of the .PHONY variable as phony.  We keep that
1734 # information in a variable so we can use it in if_changed and friends.
1735 .PHONY: $(PHONY)