Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 16
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc5
   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.a targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Use make M=dir to specify directory of external module to build
 180 # Old syntax make ... SUBDIRS=$PWD is still supported
 181 # Setting the environment variable KBUILD_EXTMOD take precedence
 182 ifdef SUBDIRS
 183   KBUILD_EXTMOD ?= $(SUBDIRS)
 184 endif
 185
 186 ifeq ("$(origin M)", "command line")
 187   KBUILD_EXTMOD := $(M)
 188 endif
 189
 190 ifeq ($(KBUILD_SRC),)
 191         # building in the source tree
 192         srctree := .
 193 else
 194         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 195                 # building in a subdirectory of the source tree
 196                 srctree := ..
 197         else
 198                 srctree := $(KBUILD_SRC)
 199         endif
 200 endif
 201
 202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 203
 204 objtree         := .
 205 src             := $(srctree)
 206 obj             := $(objtree)
 207
 208 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 209
 210 export srctree objtree VPATH
 211
 212 # To make sure we do not include .config for any of the *config targets
 213 # catch them early, and hand them over to scripts/kconfig/Makefile
 214 # It is allowed to specify more targets when calling make, including
 215 # mixing *config targets and build targets.
 216 # For example 'make oldconfig all'.
 217 # Detect when mixed targets is specified, and make a second invocation
 218 # of make so .config is not included in this case either (for *config).
 219
 220 version_h := include/generated/uapi/linux/version.h
 221 old_version_h := include/linux/version.h
 222
 223 clean-targets := %clean mrproper cleandocs
 224 no-dot-config-targets := $(clean-targets) \
 225                          cscope gtags TAGS tags help% %docs check% coccicheck \
 226                          $(version_h) headers_% archheaders archscripts \
 227                          kernelversion %src-pkg
 228
 229 config-targets := 0
 230 mixed-targets  := 0
 231 dot-config     := 1
 232
 233 ifneq ($(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 $(MAKECMDGOALS)),1)
 243                         mixed-targets := 1
 244                 endif
 245         endif
 246 endif
 247
 248 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 249 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 250         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 251                 mixed-targets := 1
 252         endif
 253 endif
 254
 255 # install and modules_install need also be processed one by one
 256 ifneq ($(filter install,$(MAKECMDGOALS)),)
 257         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 258                 mixed-targets := 1
 259         endif
 260 endif
 261
 262 ifeq ($(mixed-targets),1)
 263 # ===========================================================================
 264 # We're called with mixed targets (*config and build targets).
 265 # Handle them one by one.
 266
 267 PHONY += $(MAKECMDGOALS) __build_one_by_one
 268
 269 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 270         @:
 271
 272 __build_one_by_one:
 273         $(Q)set -e; \
 274         for i in $(MAKECMDGOALS); do \
 275                 $(MAKE) -f $(srctree)/Makefile $$i; \
 276         done
 277
 278 else
 279
 280 # We need some generic definitions (do not try to remake the file).
 281 scripts/Kbuild.include: ;
 282 include scripts/Kbuild.include
 283
 284 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 285 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 286 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 287 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 288
 289 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 290 # first, and if a usermode build is happening, the "ARCH=um" on the command
 291 # line overrides the setting of ARCH below.  If a native build is happening,
 292 # then ARCH is assigned, getting whatever value it gets normally, and
 293 # SUBARCH is subsequently ignored.
 294
 295 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 296                                   -e s/sun4u/sparc64/ \
 297                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 298                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 299                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 300                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
 301                                   -e s/riscv.*/riscv/)
 302
 303 # Cross compiling and selecting different set of gcc/bin-utils
 304 # ---------------------------------------------------------------------------
 305 #
 306 # When performing cross compilation for other architectures ARCH shall be set
 307 # to the target architecture. (See arch/* for the possibilities).
 308 # ARCH can be set during invocation of make:
 309 # make ARCH=ia64
 310 # Another way is to have ARCH set in the environment.
 311 # The default ARCH is the host where make is executed.
 312
 313 # CROSS_COMPILE specify the prefix used for all executables used
 314 # during compilation. Only gcc and related bin-utils executables
 315 # are prefixed with $(CROSS_COMPILE).
 316 # CROSS_COMPILE can be set on the command line
 317 # make CROSS_COMPILE=ia64-linux-
 318 # Alternatively CROSS_COMPILE can be set in the environment.
 319 # A third alternative is to store a setting in .config so that plain
 320 # "make" in the configured kernel build directory always uses that.
 321 # Default value for CROSS_COMPILE is not to prefix executables
 322 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 323 ARCH            ?= $(SUBARCH)
 324 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 325
 326 # Architecture as present in compile.h
 327 UTS_MACHINE     := $(ARCH)
 328 SRCARCH         := $(ARCH)
 329
 330 # Additional ARCH settings for x86
 331 ifeq ($(ARCH),i386)
 332         SRCARCH := x86
 333 endif
 334 ifeq ($(ARCH),x86_64)
 335         SRCARCH := x86
 336 endif
 337
 338 # Additional ARCH settings for sparc
 339 ifeq ($(ARCH),sparc32)
 340        SRCARCH := sparc
 341 endif
 342 ifeq ($(ARCH),sparc64)
 343        SRCARCH := sparc
 344 endif
 345
 346 # Additional ARCH settings for sh
 347 ifeq ($(ARCH),sh64)
 348        SRCARCH := sh
 349 endif
 350
 351 # Additional ARCH settings for tile
 352 ifeq ($(ARCH),tilepro)
 353        SRCARCH := tile
 354 endif
 355 ifeq ($(ARCH),tilegx)
 356        SRCARCH := tile
 357 endif
 358
 359 KCONFIG_CONFIG  ?= .config
 360 export KCONFIG_CONFIG
 361
 362 # SHELL used by kbuild
 363 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 364           else if [ -x /bin/bash ]; then echo /bin/bash; \
 365           else echo sh; fi ; fi)
 366
 367 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
 368 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
 369 HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
 370
 371 HOSTCC       = gcc
 372 HOSTCXX      = g++
 373 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 374                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 375 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 376 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 377 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 378
 379 # Make variables (CC, etc...)
 380 AS              = $(CROSS_COMPILE)as
 381 LD              = $(CROSS_COMPILE)ld
 382 CC              = $(CROSS_COMPILE)gcc
 383 CPP             = $(CC) -E
 384 AR              = $(CROSS_COMPILE)ar
 385 NM              = $(CROSS_COMPILE)nm
 386 STRIP           = $(CROSS_COMPILE)strip
 387 OBJCOPY         = $(CROSS_COMPILE)objcopy
 388 OBJDUMP         = $(CROSS_COMPILE)objdump
 389 LEX             = flex
 390 YACC            = bison
 391 AWK             = awk
 392 GENKSYMS        = scripts/genksyms/genksyms
 393 INSTALLKERNEL  := installkernel
 394 DEPMOD          = /sbin/depmod
 395 PERL            = perl
 396 PYTHON          = python
 397 CHECK           = sparse
 398
 399 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 400                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 401 NOSTDINC_FLAGS  =
 402 CFLAGS_MODULE   =
 403 AFLAGS_MODULE   =
 404 LDFLAGS_MODULE  =
 405 CFLAGS_KERNEL   =
 406 AFLAGS_KERNEL   =
 407 LDFLAGS_vmlinux =
 408
 409 # Use USERINCLUDE when you must reference the UAPI directories only.
 410 USERINCLUDE    := \
 411                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 412                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 413                 -I$(srctree)/include/uapi \
 414                 -I$(objtree)/include/generated/uapi \
 415                 -include $(srctree)/include/linux/kconfig.h
 416
 417 # Use LINUXINCLUDE when you must reference the include/ directory.
 418 # Needed to be compatible with the O= option
 419 LINUXINCLUDE    := \
 420                 -I$(srctree)/arch/$(SRCARCH)/include \
 421                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 422                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 423                 -I$(objtree)/include \
 424                 $(USERINCLUDE)
 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 LDFLAGS :=
 439 GCC_PLUGINS_CFLAGS :=
 440
 441 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 442 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 443 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 444 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 445
 446 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 447 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 448 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 449 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 450 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 451 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 452 export KBUILD_ARFLAGS
 453
 454 # When compiling out-of-tree modules, put MODVERDIR in the module
 455 # tree rather than in the kernel tree. The kernel tree might
 456 # even be read-only.
 457 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 458
 459 # Files to ignore in find ... statements
 460
 461 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 462                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 463                           -prune -o
 464 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 465                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 466
 467 # ===========================================================================
 468 # Rules shared between *config targets and build targets
 469
 470 # Basic helpers built in scripts/basic/
 471 PHONY += scripts_basic
 472 scripts_basic:
 473         $(Q)$(MAKE) $(build)=scripts/basic
 474         $(Q)rm -f .tmp_quiet_recordmcount
 475
 476 # To avoid any implicit rule to kick in, define an empty command.
 477 scripts/basic/%: scripts_basic ;
 478
 479 PHONY += outputmakefile
 480 # outputmakefile generates a Makefile in the output directory, if using a
 481 # separate output directory. This allows convenient use of make in the
 482 # output directory.
 483 outputmakefile:
 484 ifneq ($(KBUILD_SRC),)
 485         $(Q)ln -fsn $(srctree) source
 486         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 487             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 488 endif
 489
 490 ifeq ($(cc-name),clang)
 491 ifneq ($(CROSS_COMPILE),)
 492 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 493 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 494 endif
 495 ifneq ($(GCC_TOOLCHAIN),)
 496 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 497 endif
 498 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 499 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 500 endif
 501
 502 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 503 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 504 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 505 export RETPOLINE_CFLAGS
 506
 507 ifeq ($(config-targets),1)
 508 # ===========================================================================
 509 # *config targets only - make sure prerequisites are updated, and descend
 510 # in scripts/kconfig to make the *config target
 511
 512 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 513 # KBUILD_DEFCONFIG may point out an alternative default configuration
 514 # used for 'make defconfig'
 515 include arch/$(SRCARCH)/Makefile
 516 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 517
 518 config: scripts_basic outputmakefile FORCE
 519         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 520
 521 %config: scripts_basic outputmakefile FORCE
 522         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 523
 524 else
 525 # ===========================================================================
 526 # Build targets only - this includes vmlinux, arch specific targets, clean
 527 # targets and others. In general all targets except *config targets.
 528
 529 # If building an external module we do not care about the all: rule
 530 # but instead _all depend on modules
 531 PHONY += all
 532 ifeq ($(KBUILD_EXTMOD),)
 533 _all: all
 534 else
 535 _all: modules
 536 endif
 537
 538 # Decide whether to build built-in, modular, or both.
 539 # Normally, just do built-in.
 540
 541 KBUILD_MODULES :=
 542 KBUILD_BUILTIN := 1
 543
 544 # If we have only "make modules", don't compile built-in objects.
 545 # When we're building modules with modversions, we need to consider
 546 # the built-in objects during the descend as well, in order to
 547 # make sure the checksums are up to date before we record them.
 548
 549 ifeq ($(MAKECMDGOALS),modules)
 550   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 551 endif
 552
 553 # If we have "make <whatever> modules", compile modules
 554 # in addition to whatever we do anyway.
 555 # Just "make" or "make all" shall build modules as well
 556
 557 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 558   KBUILD_MODULES := 1
 559 endif
 560
 561 ifeq ($(MAKECMDGOALS),)
 562   KBUILD_MODULES := 1
 563 endif
 564
 565 export KBUILD_MODULES KBUILD_BUILTIN
 566
 567 ifeq ($(KBUILD_EXTMOD),)
 568 # Objects we will link into vmlinux / subdirs we need to visit
 569 init-y          := init/
 570 drivers-y       := drivers/ sound/ firmware/
 571 net-y           := net/
 572 libs-y          := lib/
 573 core-y          := usr/
 574 virt-y          := virt/
 575 endif # KBUILD_EXTMOD
 576
 577 ifeq ($(dot-config),1)
 578 # Read in config
 579 -include include/config/auto.conf
 580
 581 ifeq ($(KBUILD_EXTMOD),)
 582 # Read in dependencies to all Kconfig* files, make sure to run
 583 # oldconfig if changes are detected.
 584 -include include/config/auto.conf.cmd
 585
 586 # To avoid any implicit rule to kick in, define an empty command
 587 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 588
 589 # The actual configuration files used during the build are stored in
 590 # include/generated/ and include/config/. Update them if .config is newer than
 591 # include/config/auto.conf (which mirrors .config).
 592 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 593         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 594 else
 595 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 596 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 597 PHONY += include/config/auto.conf
 598
 599 include/config/auto.conf:
 600         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 601         echo >&2;                                                       \
 602         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 603         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 604         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 605         echo >&2 ;                                                      \
 606         /bin/false)
 607
 608 endif # KBUILD_EXTMOD
 609
 610 else
 611 # Dummy target needed, because used as prerequisite
 612 include/config/auto.conf: ;
 613 endif # $(dot-config)
 614
 615 # The all: target is the default when no target is given on the
 616 # command line.
 617 # This allow a user to issue only 'make' to build a kernel including modules
 618 # Defaults to vmlinux, but the arch makefile usually adds further targets
 619 all: vmlinux
 620
 621 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 622 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 623 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 624 export CFLAGS_GCOV CFLAGS_KCOV
 625
 626 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 627 # values of the respective KBUILD_* variables
 628 ARCH_CPPFLAGS :=
 629 ARCH_AFLAGS :=
 630 ARCH_CFLAGS :=
 631 include arch/$(SRCARCH)/Makefile
 632
 633 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 634 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 635 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 636 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 637 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 638
 639 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 640 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 641 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 642 else
 643 ifdef CONFIG_PROFILE_ALL_BRANCHES
 644 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 645 else
 646 KBUILD_CFLAGS   += -O2
 647 endif
 648 endif
 649
 650 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 651                         $(call cc-disable-warning,maybe-uninitialized,))
 652
 653 # Tell gcc to never replace conditional load with a non-conditional one
 654 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 655
 656 # check for 'asm goto'
 657 ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 658         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 659         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 660 endif
 661
 662 include scripts/Makefile.kcov
 663 include scripts/Makefile.gcc-plugins
 664
 665 ifdef CONFIG_READABLE_ASM
 666 # Disable optimizations that make assembler listings hard to read.
 667 # reorder blocks reorders the control in the function
 668 # ipa clone creates specialized cloned functions
 669 # partial inlining inlines only parts of functions
 670 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 671                  $(call cc-option,-fno-ipa-cp-clone,) \
 672                  $(call cc-option,-fno-partial-inlining)
 673 endif
 674
 675 ifneq ($(CONFIG_FRAME_WARN),0)
 676 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 677 endif
 678
 679 # This selects the stack protector compiler flag. Testing it is delayed
 680 # until after .config has been reprocessed, in the prepare-compiler-check
 681 # target.
 682 ifdef CONFIG_CC_STACKPROTECTOR_AUTO
 683   stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector))
 684   stackp-name := AUTO
 685 else
 686 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 687   stackp-flag := -fstack-protector
 688   stackp-name := REGULAR
 689 else
 690 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 691   stackp-flag := -fstack-protector-strong
 692   stackp-name := STRONG
 693 else
 694   # If either there is no stack protector for this architecture or
 695   # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name)
 696   # is empty, skipping all remaining stack protector tests.
 697   #
 698   # Force off for distro compilers that enable stack protector by default.
 699   KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 700 endif
 701 endif
 702 endif
 703 # Find arch-specific stack protector compiler sanity-checking script.
 704 ifdef stackp-name
 705 ifneq ($(stackp-flag),)
 706   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 707   stackp-check := $(wildcard $(stackp-path))
 708   # If the wildcard test matches a test script, run it to check functionality.
 709   ifdef stackp-check
 710     ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
 711       stackp-broken := y
 712     endif
 713   endif
 714   ifndef stackp-broken
 715     # If the stack protector is functional, enable code that depends on it.
 716     KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR
 717     # Either we've already detected the flag (for AUTO) or we'll fail the
 718     # build in the prepare-compiler-check rule (for specific flag).
 719     KBUILD_CFLAGS += $(stackp-flag)
 720   else
 721     # We have to make sure stack protector is unconditionally disabled if
 722     # the compiler is broken (in case we're going to continue the build in
 723     # AUTO mode).
 724     KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 725   endif
 726 endif
 727 endif
 728
 729 ifeq ($(cc-name),clang)
 730 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 731 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 732 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 733 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 734 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 735 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 736 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 737 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 738 # See modpost pattern 2
 739 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 740 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 741 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 742 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 743 else
 744
 745 # These warnings generated too much noise in a regular build.
 746 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 747 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 748 endif
 749
 750 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 751 ifdef CONFIG_FRAME_POINTER
 752 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 753 else
 754 # Some targets (ARM with Thumb2, for example), can't be built with frame
 755 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 756 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 757 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 758 # -fomit-frame-pointer with FUNCTION_TRACER.
 759 ifndef CONFIG_FUNCTION_TRACER
 760 KBUILD_CFLAGS   += -fomit-frame-pointer
 761 endif
 762 endif
 763
 764 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 765
 766 ifdef CONFIG_DEBUG_INFO
 767 ifdef CONFIG_DEBUG_INFO_SPLIT
 768 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 769 else
 770 KBUILD_CFLAGS   += -g
 771 endif
 772 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 773 endif
 774 ifdef CONFIG_DEBUG_INFO_DWARF4
 775 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 776 endif
 777
 778 ifdef CONFIG_DEBUG_INFO_REDUCED
 779 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 780                    $(call cc-option,-fno-var-tracking)
 781 endif
 782
 783 ifdef CONFIG_FUNCTION_TRACER
 784 ifndef CC_FLAGS_FTRACE
 785 CC_FLAGS_FTRACE := -pg
 786 endif
 787 export CC_FLAGS_FTRACE
 788 ifdef CONFIG_HAVE_FENTRY
 789 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 790 endif
 791 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 792 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 793 ifdef CONFIG_DYNAMIC_FTRACE
 794         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 795                 BUILD_C_RECORDMCOUNT := y
 796                 export BUILD_C_RECORDMCOUNT
 797         endif
 798 endif
 799 endif
 800
 801 # We trigger additional mismatches with less inlining
 802 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 803 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 804 endif
 805
 806 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 807 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 808 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 809 endif
 810
 811 # arch Makefile may override CC so keep this after arch Makefile is included
 812 NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
 813 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 814
 815 # warn about C99 declaration after statement
 816 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 817
 818 # disable pointer signed / unsigned warnings in gcc 4.0
 819 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 820
 821 # disable invalid "can't wrap" optimizations for signed / pointers
 822 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 823
 824 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 825 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 826
 827 # conserve stack if available
 828 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 829
 830 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 831 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 832
 833 # require functions to have arguments in prototypes, not empty 'int foo()'
 834 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 835
 836 # Prohibit date/time macros, which would make the build non-deterministic
 837 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 838
 839 # enforce correct pointer usage
 840 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 841
 842 # Require designated initializers for all marked structures
 843 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 844
 845 # use the deterministic mode of AR if available
 846 KBUILD_ARFLAGS := $(call ar-option,D)
 847
 848 include scripts/Makefile.kasan
 849 include scripts/Makefile.extrawarn
 850 include scripts/Makefile.ubsan
 851
 852 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 853 # last assignments
 854 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 855 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 856 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 857
 858 # Use --build-id when available.
 859 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 860 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 861 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 862
 863 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 864 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 865 endif
 866
 867 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 868 LDFLAGS_vmlinux += $(call ld-option, -X,)
 869 endif
 870
 871 # Default kernel image to build when no specific target is given.
 872 # KBUILD_IMAGE may be overruled on the command line or
 873 # set in the environment
 874 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 875 # this default value
 876 export KBUILD_IMAGE ?= vmlinux
 877
 878 #
 879 # INSTALL_PATH specifies where to place the updated kernel and system map
 880 # images. Default is /boot, but you can set it to other values
 881 export  INSTALL_PATH ?= /boot
 882
 883 #
 884 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 885 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 886 # an argument if needed. Otherwise it defaults to the kernel install path
 887 #
 888 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 889
 890 #
 891 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 892 # relocations required by build roots.  This is not defined in the
 893 # makefile but the argument can be passed to make if needed.
 894 #
 895
 896 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 897 export MODLIB
 898
 899 #
 900 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 901 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 902 # the default option --strip-debug will be used.  Otherwise,
 903 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 904
 905 ifdef INSTALL_MOD_STRIP
 906 ifeq ($(INSTALL_MOD_STRIP),1)
 907 mod_strip_cmd = $(STRIP) --strip-debug
 908 else
 909 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 910 endif # INSTALL_MOD_STRIP=1
 911 else
 912 mod_strip_cmd = true
 913 endif # INSTALL_MOD_STRIP
 914 export mod_strip_cmd
 915
 916 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 917 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 918 # or CONFIG_MODULE_COMPRESS_XZ.
 919
 920 mod_compress_cmd = true
 921 ifdef CONFIG_MODULE_COMPRESS
 922   ifdef CONFIG_MODULE_COMPRESS_GZIP
 923     mod_compress_cmd = gzip -n -f
 924   endif # CONFIG_MODULE_COMPRESS_GZIP
 925   ifdef CONFIG_MODULE_COMPRESS_XZ
 926     mod_compress_cmd = xz -f
 927   endif # CONFIG_MODULE_COMPRESS_XZ
 928 endif # CONFIG_MODULE_COMPRESS
 929 export mod_compress_cmd
 930
 931 # Select initial ramdisk compression format, default is gzip(1).
 932 # This shall be used by the dracut(8) tool while creating an initramfs image.
 933 #
 934 INITRD_COMPRESS-y                  := gzip
 935 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 936 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 937 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 938 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 939 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 940 # do not export INITRD_COMPRESS, since we didn't actually
 941 # choose a sane default compression above.
 942 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 943
 944 ifdef CONFIG_MODULE_SIG_ALL
 945 $(eval $(call config_filename,MODULE_SIG_KEY))
 946
 947 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 948 else
 949 mod_sign_cmd = true
 950 endif
 951 export mod_sign_cmd
 952
 953 ifdef CONFIG_STACK_VALIDATION
 954   has_libelf := $(call try-run,\
 955                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 956   ifeq ($(has_libelf),1)
 957     objtool_target := tools/objtool FORCE
 958   else
 959     ifdef CONFIG_UNWINDER_ORC
 960       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 961     else
 962       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 963     endif
 964     SKIP_STACK_VALIDATION := 1
 965     export SKIP_STACK_VALIDATION
 966   endif
 967 endif
 968
 969
 970 ifeq ($(KBUILD_EXTMOD),)
 971 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 972
 973 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 974                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 975                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 976
 977 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 978                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 979
 980 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 981 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 982 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 983 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 984 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 985 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 986 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 987
 988 # Externally visible symbols (used by link-vmlinux.sh)
 989 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 990 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 991 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 992 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 993 export LDFLAGS_vmlinux
 994 # used by scripts/package/Makefile
 995 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 996
 997 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 998
 999 # Include targets which we want to execute sequentially if the rest of the
1000 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1001 # evaluated more than once.
1002 PHONY += vmlinux_prereq
1003 vmlinux_prereq: $(vmlinux-deps) FORCE
1004 ifdef CONFIG_HEADERS_CHECK
1005         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1006 endif
1007 ifdef CONFIG_GDB_SCRIPTS
1008         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1009 endif
1010 ifdef CONFIG_TRIM_UNUSED_KSYMS
1011         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1012           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1013 endif
1014
1015 # For the kernel to actually contain only the needed exported symbols,
1016 # we have to build modules as well to determine what those symbols are.
1017 # (this can be evaluated only once include/config/auto.conf has been included)
1018 ifdef CONFIG_TRIM_UNUSED_KSYMS
1019   KBUILD_MODULES := 1
1020 endif
1021
1022 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1023
1024 $(autoksyms_h):
1025         $(Q)mkdir -p $(dir $@)
1026         $(Q)touch $@
1027
1028 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1029
1030 # Final link of vmlinux with optional arch pass after final link
1031 cmd_link-vmlinux =                                                 \
1032         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1033         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1034
1035 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1036         +$(call if_changed,link-vmlinux)
1037
1038 # Build samples along the rest of the kernel
1039 ifdef CONFIG_SAMPLES
1040 vmlinux-dirs += samples
1041 endif
1042
1043 # The actual objects are generated when descending,
1044 # make sure no implicit rule kicks in
1045 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1046
1047 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1048 # Preset locale variables to speed up the build process. Limit locale
1049 # tweaks to this spot to avoid wrong language settings when running
1050 # make menuconfig etc.
1051 # Error messages still appears in the original language
1052
1053 PHONY += $(vmlinux-dirs)
1054 $(vmlinux-dirs): prepare scripts
1055         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1056
1057 define filechk_kernel.release
1058         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1059 endef
1060
1061 # Store (new) KERNELRELEASE string in include/config/kernel.release
1062 include/config/kernel.release: include/config/auto.conf FORCE
1063         $(call filechk,kernel.release)
1064
1065 # Additional helpers built in scripts/
1066 # Carefully list dependencies so we do not try to build scripts twice
1067 # in parallel
1068 PHONY += scripts
1069 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
1070          asm-generic gcc-plugins $(autoksyms_h)
1071         $(Q)$(MAKE) $(build)=$(@)
1072
1073 # Things we need to do before we recursively start building the kernel
1074 # or the modules are listed in "prepare".
1075 # A multi level approach is used. prepareN is processed before prepareN-1.
1076 # archprepare is used in arch Makefiles and when processed asm symlink,
1077 # version.h and scripts_basic is processed / created.
1078
1079 # Listed in dependency order
1080 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1081
1082 # prepare3 is used to check if we are building in a separate output directory,
1083 # and if so do:
1084 # 1) Check that make has not been executed in the kernel src $(srctree)
1085 prepare3: include/config/kernel.release
1086 ifneq ($(KBUILD_SRC),)
1087         @$(kecho) '  Using $(srctree) as source for kernel'
1088         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1089                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1090                 echo >&2 "  in the '$(srctree)' directory.";\
1091                 /bin/false; \
1092         fi;
1093 endif
1094
1095 # prepare2 creates a makefile if using a separate output directory.
1096 # From this point forward, .config has been reprocessed, so any rules
1097 # that need to depend on updated CONFIG_* values can be checked here.
1098 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1099
1100 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1101                    include/config/auto.conf
1102         $(cmd_crmodverdir)
1103
1104 archprepare: archheaders archscripts prepare1 scripts_basic
1105
1106 prepare0: archprepare gcc-plugins
1107         $(Q)$(MAKE) $(build)=.
1108
1109 # All the preparing..
1110 prepare: prepare0 prepare-objtool
1111
1112 # Support for using generic headers in asm-generic
1113 PHONY += asm-generic uapi-asm-generic
1114 asm-generic: uapi-asm-generic
1115         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1116                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1117 uapi-asm-generic:
1118         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1119                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1120
1121 PHONY += prepare-objtool
1122 prepare-objtool: $(objtool_target)
1123
1124 # Check for CONFIG flags that require compiler support. Abort the build
1125 # after .config has been processed, but before the kernel build starts.
1126 #
1127 # For security-sensitive CONFIG options, we don't want to fallback and/or
1128 # silently change which compiler flags will be used, since that leads to
1129 # producing kernels with different security feature characteristics
1130 # depending on the compiler used. (For example, "But I selected
1131 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1132 PHONY += prepare-compiler-check
1133 prepare-compiler-check: FORCE
1134 # Make sure compiler supports requested stack protector flag.
1135 ifdef stackp-name
1136   # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
1137   ifeq ($(stackp-flag),)
1138         @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1139                   Compiler does not support any known stack-protector >&2
1140   else
1141   # Fail if specifically requested stack protector is missing.
1142   ifeq ($(call cc-option, $(stackp-flag)),)
1143         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1144                   $(stackp-flag) not supported by compiler >&2 && exit 1
1145   endif
1146   endif
1147 endif
1148 # Make sure compiler does not have buggy stack-protector support. If a
1149 # specific stack-protector was requested, fail the build, otherwise warn.
1150 ifdef stackp-broken
1151   ifeq ($(stackp-name),AUTO)
1152         @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1153                   $(stackp-flag) available but compiler is broken: disabling >&2
1154   else
1155         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1156                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1157   endif
1158 endif
1159         @:
1160
1161 # Generate some files
1162 # ---------------------------------------------------------------------------
1163
1164 # KERNELRELEASE can change from a few different places, meaning version.h
1165 # needs to be updated, so this check is forced on all builds
1166
1167 uts_len := 64
1168 define filechk_utsrelease.h
1169         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1170           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1171           exit 1;                                                         \
1172         fi;                                                               \
1173         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1174 endef
1175
1176 define filechk_version.h
1177         (echo \#define LINUX_VERSION_CODE $(shell                         \
1178         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1179         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1180 endef
1181
1182 $(version_h): $(srctree)/Makefile FORCE
1183         $(call filechk,version.h)
1184         $(Q)rm -f $(old_version_h)
1185
1186 include/generated/utsrelease.h: include/config/kernel.release FORCE
1187         $(call filechk,utsrelease.h)
1188
1189 PHONY += headerdep
1190 headerdep:
1191         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1192         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1193
1194 # ---------------------------------------------------------------------------
1195 # Kernel headers
1196
1197 #Default location for installed headers
1198 export INSTALL_HDR_PATH = $(objtree)/usr
1199
1200 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1201 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1202
1203 PHONY += archheaders
1204 archheaders:
1205
1206 PHONY += archscripts
1207 archscripts:
1208
1209 PHONY += __headers
1210 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1211         $(Q)$(MAKE) $(build)=scripts build_unifdef
1212
1213 PHONY += headers_install_all
1214 headers_install_all:
1215         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1216
1217 PHONY += headers_install
1218 headers_install: __headers
1219         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1220           $(error Headers not exportable for the $(SRCARCH) architecture))
1221         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1222         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1223
1224 PHONY += headers_check_all
1225 headers_check_all: headers_install_all
1226         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1227
1228 PHONY += headers_check
1229 headers_check: headers_install
1230         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1231         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1232
1233 # ---------------------------------------------------------------------------
1234 # Kernel selftest
1235
1236 PHONY += kselftest
1237 kselftest:
1238         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1239
1240 PHONY += kselftest-clean
1241 kselftest-clean:
1242         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1243
1244 PHONY += kselftest-merge
1245 kselftest-merge:
1246         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1247         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1248                 -m $(objtree)/.config \
1249                 $(srctree)/tools/testing/selftests/*/config
1250         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1251
1252 # ---------------------------------------------------------------------------
1253 # Modules
1254
1255 ifdef CONFIG_MODULES
1256
1257 # By default, build modules as well
1258
1259 all: modules
1260
1261 # Build modules
1262 #
1263 # A module can be listed more than once in obj-m resulting in
1264 # duplicate lines in modules.order files.  Those are removed
1265 # using awk while concatenating to the final file.
1266
1267 PHONY += modules
1268 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1269         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1270         @$(kecho) '  Building modules, stage 2.';
1271         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1272
1273 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1274         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1275
1276 %/modules.builtin: include/config/auto.conf
1277         $(Q)$(MAKE) $(modbuiltin)=$*
1278
1279
1280 # Target to prepare building external modules
1281 PHONY += modules_prepare
1282 modules_prepare: prepare scripts
1283
1284 # Target to install modules
1285 PHONY += modules_install
1286 modules_install: _modinst_ _modinst_post
1287
1288 PHONY += _modinst_
1289 _modinst_:
1290         @rm -rf $(MODLIB)/kernel
1291         @rm -f $(MODLIB)/source
1292         @mkdir -p $(MODLIB)/kernel
1293         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1294         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1295                 rm -f $(MODLIB)/build ; \
1296                 ln -s $(CURDIR) $(MODLIB)/build ; \
1297         fi
1298         @cp -f $(objtree)/modules.order $(MODLIB)/
1299         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1300         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1301
1302 # This depmod is only for convenience to give the initial
1303 # boot a modules.dep even before / is mounted read-write.  However the
1304 # boot script depmod is the master version.
1305 PHONY += _modinst_post
1306 _modinst_post: _modinst_
1307         $(call cmd,depmod)
1308
1309 ifeq ($(CONFIG_MODULE_SIG), y)
1310 PHONY += modules_sign
1311 modules_sign:
1312         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1313 endif
1314
1315 else # CONFIG_MODULES
1316
1317 # Modules not configured
1318 # ---------------------------------------------------------------------------
1319
1320 PHONY += modules modules_install
1321 modules modules_install:
1322         @echo >&2
1323         @echo >&2 "The present kernel configuration has modules disabled."
1324         @echo >&2 "Type 'make config' and enable loadable module support."
1325         @echo >&2 "Then build a kernel with module support enabled."
1326         @echo >&2
1327         @exit 1
1328
1329 endif # CONFIG_MODULES
1330
1331 ###
1332 # Cleaning is done on three levels.
1333 # make clean     Delete most generated files
1334 #                Leave enough to build external modules
1335 # make mrproper  Delete the current configuration, and all generated files
1336 # make distclean Remove editor backup files, patch leftover files and the like
1337
1338 # Directories & files removed with 'make clean'
1339 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1340
1341 # Directories & files removed with 'make mrproper'
1342 MRPROPER_DIRS  += include/config usr/include include/generated          \
1343                   arch/*/include/generated .tmp_objdiff
1344 MRPROPER_FILES += .config .config.old .version \
1345                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1346                   signing_key.pem signing_key.priv signing_key.x509     \
1347                   x509.genkey extra_certificates signing_key.x509.keyid \
1348                   signing_key.x509.signer vmlinux-gdb.py
1349
1350 # clean - Delete most, but leave enough to build external modules
1351 #
1352 clean: rm-dirs  := $(CLEAN_DIRS)
1353 clean: rm-files := $(CLEAN_FILES)
1354 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1355
1356 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1357 $(clean-dirs):
1358         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1359
1360 vmlinuxclean:
1361         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1362         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1363
1364 clean: archclean vmlinuxclean
1365
1366 # mrproper - Delete all generated files, including .config
1367 #
1368 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1369 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1370 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1371
1372 PHONY += $(mrproper-dirs) mrproper archmrproper
1373 $(mrproper-dirs):
1374         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1375
1376 mrproper: clean archmrproper $(mrproper-dirs)
1377         $(call cmd,rmdirs)
1378         $(call cmd,rmfiles)
1379
1380 # distclean
1381 #
1382 PHONY += distclean
1383
1384 distclean: mrproper
1385         @find $(srctree) $(RCS_FIND_IGNORE) \
1386                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1387                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1388                 -o -name 'core' \) \
1389                 -type f -print | xargs rm -f
1390
1391
1392 # Packaging of the kernel to various formats
1393 # ---------------------------------------------------------------------------
1394 # rpm target kept for backward compatibility
1395 package-dir     := scripts/package
1396
1397 %src-pkg: FORCE
1398         $(Q)$(MAKE) $(build)=$(package-dir) $@
1399 %pkg: include/config/kernel.release FORCE
1400         $(Q)$(MAKE) $(build)=$(package-dir) $@
1401 rpm: rpm-pkg
1402         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1403         @echo "           Please use \"rpm-pkg\" instead."
1404
1405
1406 # Brief documentation of the typical targets used
1407 # ---------------------------------------------------------------------------
1408
1409 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1410 boards := $(sort $(notdir $(boards)))
1411 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1412 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1413
1414 PHONY += help
1415 help:
1416         @echo  'Cleaning targets:'
1417         @echo  '  clean           - Remove most generated files but keep the config and'
1418         @echo  '                    enough build support to build external modules'
1419         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1420         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1421         @echo  ''
1422         @echo  'Configuration targets:'
1423         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1424         @echo  ''
1425         @echo  'Other generic targets:'
1426         @echo  '  all             - Build all targets marked with [*]'
1427         @echo  '* vmlinux         - Build the bare kernel'
1428         @echo  '* modules         - Build all modules'
1429         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1430         @echo  '  dir/            - Build all files in dir and below'
1431         @echo  '  dir/file.[ois]  - Build specified target only'
1432         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1433         @echo  '                    (requires compiler support for LLVM assembly generation)'
1434         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1435         @echo  '                    (requires a recent binutils and recent build (System.map))'
1436         @echo  '  dir/file.ko     - Build module including final link'
1437         @echo  '  modules_prepare - Set up for building external modules'
1438         @echo  '  tags/TAGS       - Generate tags file for editors'
1439         @echo  '  cscope          - Generate cscope index'
1440         @echo  '  gtags           - Generate GNU GLOBAL index'
1441         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1442         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1443         @echo  '  image_name      - Output the image name (use with make -s)'
1444         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1445          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1446          echo  ''
1447         @echo  'Static analysers:'
1448         @echo  '  checkstack      - Generate a list of stack hogs'
1449         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1450         @echo  '  versioncheck    - Sanity check on version.h usage'
1451         @echo  '  includecheck    - Check for duplicate included header files'
1452         @echo  '  export_report   - List the usages of all exported symbols'
1453         @echo  '  headers_check   - Sanity check on exported headers'
1454         @echo  '  headerdep       - Detect inclusion cycles in headers'
1455         @echo  '  coccicheck      - Check with Coccinelle'
1456         @echo  ''
1457         @echo  'Kernel selftest:'
1458         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1459         @echo  '                    Build, install, and boot kernel before'
1460         @echo  '                    running kselftest on it'
1461         @echo  '  kselftest-clean - Remove all generated kselftest files'
1462         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1463         @echo  '                    .config.'
1464         @echo  ''
1465         @echo 'Userspace tools targets:'
1466         @echo '  use "make tools/help"'
1467         @echo '  or  "cd tools; make help"'
1468         @echo  ''
1469         @echo  'Kernel packaging:'
1470         @$(MAKE) $(build)=$(package-dir) help
1471         @echo  ''
1472         @echo  'Documentation targets:'
1473         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1474         @echo  ''
1475         @echo  'Architecture specific targets ($(SRCARCH)):'
1476         @$(if $(archhelp),$(archhelp),\
1477                 echo '  No architecture specific help defined for $(SRCARCH)')
1478         @echo  ''
1479         @$(if $(boards), \
1480                 $(foreach b, $(boards), \
1481                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1482                 echo '')
1483         @$(if $(board-dirs), \
1484                 $(foreach b, $(board-dirs), \
1485                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1486                 printf "  %-16s - Show all of the above\\n" help-boards; \
1487                 echo '')
1488
1489         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1490         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1491         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1492         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1493         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1494         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1495         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1496         @echo  '                1: warnings which may be relevant and do not occur too often'
1497         @echo  '                2: warnings which occur quite often but may still be relevant'
1498         @echo  '                3: more obscure warnings, can most likely be ignored'
1499         @echo  '                Multiple levels can be combined with W=12 or W=123'
1500         @echo  ''
1501         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1502         @echo  'For further info see the ./README file'
1503
1504
1505 help-board-dirs := $(addprefix help-,$(board-dirs))
1506
1507 help-boards: $(help-board-dirs)
1508
1509 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1510
1511 $(help-board-dirs): help-%:
1512         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1513         @$(if $(boards-per-dir), \
1514                 $(foreach b, $(boards-per-dir), \
1515                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1516                 echo '')
1517
1518
1519 # Documentation targets
1520 # ---------------------------------------------------------------------------
1521 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1522                linkcheckdocs dochelp refcheckdocs
1523 PHONY += $(DOC_TARGETS)
1524 $(DOC_TARGETS): scripts_basic FORCE
1525         $(Q)$(MAKE) $(build)=Documentation $@
1526
1527 else # KBUILD_EXTMOD
1528
1529 ###
1530 # External module support.
1531 # When building external modules the kernel used as basis is considered
1532 # read-only, and no consistency checks are made and the make
1533 # system is not used on the basis kernel. If updates are required
1534 # in the basis kernel ordinary make commands (without M=...) must
1535 # be used.
1536 #
1537 # The following are the only valid targets when building external
1538 # modules.
1539 # make M=dir clean     Delete all automatically generated files
1540 # make M=dir modules   Make all modules in specified dir
1541 # make M=dir           Same as 'make M=dir modules'
1542 # make M=dir modules_install
1543 #                      Install the modules built in the module directory
1544 #                      Assumes install directory is already created
1545
1546 # We are always building modules
1547 KBUILD_MODULES := 1
1548 PHONY += crmodverdir
1549 crmodverdir:
1550         $(cmd_crmodverdir)
1551
1552 PHONY += $(objtree)/Module.symvers
1553 $(objtree)/Module.symvers:
1554         @test -e $(objtree)/Module.symvers || ( \
1555         echo; \
1556         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1557         echo "           is missing; modules will have no dependencies and modversions."; \
1558         echo )
1559
1560 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1561 PHONY += $(module-dirs) modules
1562 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1563         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1564
1565 modules: $(module-dirs)
1566         @$(kecho) '  Building modules, stage 2.';
1567         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1568
1569 PHONY += modules_install
1570 modules_install: _emodinst_ _emodinst_post
1571
1572 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1573 PHONY += _emodinst_
1574 _emodinst_:
1575         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1576         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1577
1578 PHONY += _emodinst_post
1579 _emodinst_post: _emodinst_
1580         $(call cmd,depmod)
1581
1582 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1583
1584 PHONY += $(clean-dirs) clean
1585 $(clean-dirs):
1586         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1587
1588 clean:  rm-dirs := $(MODVERDIR)
1589 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1590
1591 PHONY += help
1592 help:
1593         @echo  '  Building external modules.'
1594         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1595         @echo  ''
1596         @echo  '  modules         - default target, build the module(s)'
1597         @echo  '  modules_install - install the module'
1598         @echo  '  clean           - remove generated files in module directory only'
1599         @echo  ''
1600
1601 # Dummies...
1602 PHONY += prepare scripts
1603 prepare: ;
1604 scripts: ;
1605 endif # KBUILD_EXTMOD
1606
1607 clean: $(clean-dirs)
1608         $(call cmd,rmdirs)
1609         $(call cmd,rmfiles)
1610         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1611                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1612                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1613                 -o -name '*.dwo' -o -name '*.lst' \
1614                 -o -name '*.su'  \
1615                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1616                 -o -name '*.symtypes' -o -name 'modules.order' \
1617                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1618                 -o -name .cache.mk \
1619                 -o -name '*.c.[012]*.*' \
1620                 -o -name '*.ll' \
1621                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1622
1623 # Generate tags for editors
1624 # ---------------------------------------------------------------------------
1625 quiet_cmd_tags = GEN     $@
1626       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1627
1628 tags TAGS cscope gtags: FORCE
1629         $(call cmd,tags)
1630
1631 # Scripts to check various things for consistency
1632 # ---------------------------------------------------------------------------
1633
1634 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1635
1636 includecheck:
1637         find $(srctree)/* $(RCS_FIND_IGNORE) \
1638                 -name '*.[hcS]' -type f -print | sort \
1639                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1640
1641 versioncheck:
1642         find $(srctree)/* $(RCS_FIND_IGNORE) \
1643                 -name '*.[hcS]' -type f -print | sort \
1644                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1645
1646 coccicheck:
1647         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1648
1649 namespacecheck:
1650         $(PERL) $(srctree)/scripts/namespace.pl
1651
1652 export_report:
1653         $(PERL) $(srctree)/scripts/export_report.pl
1654
1655 endif #ifeq ($(config-targets),1)
1656 endif #ifeq ($(mixed-targets),1)
1657
1658 PHONY += checkstack kernelrelease kernelversion image_name
1659
1660 # UML needs a little special treatment here.  It wants to use the host
1661 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1662 # else wants $(ARCH), including people doing cross-builds, which means
1663 # that $(SUBARCH) doesn't work here.
1664 ifeq ($(ARCH), um)
1665 CHECKSTACK_ARCH := $(SUBARCH)
1666 else
1667 CHECKSTACK_ARCH := $(ARCH)
1668 endif
1669 checkstack:
1670         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1671         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1672
1673 kernelrelease:
1674         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1675
1676 kernelversion:
1677         @echo $(KERNELVERSION)
1678
1679 image_name:
1680         @echo $(KBUILD_IMAGE)
1681
1682 # Clear a bunch of variables before executing the submake
1683 tools/: FORCE
1684         $(Q)mkdir -p $(objtree)/tools
1685         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1686
1687 tools/%: FORCE
1688         $(Q)mkdir -p $(objtree)/tools
1689         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1690
1691 # Single targets
1692 # ---------------------------------------------------------------------------
1693 # Single targets are compatible with:
1694 # - build with mixed source and output
1695 # - build with separate output dir 'make O=...'
1696 # - external modules
1697 #
1698 #  target-dir => where to store outputfile
1699 #  build-dir  => directory in kernel source tree to use
1700
1701 ifeq ($(KBUILD_EXTMOD),)
1702         build-dir  = $(patsubst %/,%,$(dir $@))
1703         target-dir = $(dir $@)
1704 else
1705         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1706         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1707         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1708 endif
1709
1710 %.s: %.c prepare scripts FORCE
1711         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1712 %.i: %.c prepare scripts FORCE
1713         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1714 %.o: %.c prepare scripts FORCE
1715         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1716 %.lst: %.c prepare scripts FORCE
1717         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1718 %.s: %.S prepare scripts FORCE
1719         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1720 %.o: %.S prepare scripts FORCE
1721         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1722 %.symtypes: %.c prepare scripts FORCE
1723         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1724 %.ll: %.c prepare scripts FORCE
1725         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1726
1727 # Modules
1728 /: prepare scripts FORCE
1729         $(cmd_crmodverdir)
1730         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1731         $(build)=$(build-dir)
1732 # Make sure the latest headers are built for Documentation
1733 Documentation/ samples/: headers_install
1734 %/: prepare scripts FORCE
1735         $(cmd_crmodverdir)
1736         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1737         $(build)=$(build-dir)
1738 %.ko: prepare scripts FORCE
1739         $(cmd_crmodverdir)
1740         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1741         $(build)=$(build-dir) $(@:.ko=.o)
1742         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1743
1744 # FIXME Should go into a make.lib or something
1745 # ===========================================================================
1746
1747 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1748       cmd_rmdirs = rm -rf $(rm-dirs)
1749
1750 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1751       cmd_rmfiles = rm -f $(rm-files)
1752
1753 # Run depmod only if we have System.map and depmod is executable
1754 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1755       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1756                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1757
1758 # Create temporary dir for module support files
1759 # clean it up only when building all modules
1760 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1761                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1762
1763 # read all saved command lines
1764
1765 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1766
1767 ifneq ($(cmd_files),)
1768   $(cmd_files): ;       # Do not try to update included dependency files
1769   include $(cmd_files)
1770 endif
1771
1772 endif   # skip-makefile
1773
1774 PHONY += FORCE
1775 FORCE:
1776
1777 # Declare the contents of the .PHONY variable as phony.  We keep that
1778 # information in a variable so we can use it in if_changed and friends.
1779 .PHONY: $(PHONY)