Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 14
   4 SUBLEVEL = 105
   5 EXTRAVERSION =
   6 NAME = Petit Gorille
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.o targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && /bin/pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 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
 293 # Cross compiling and selecting different set of gcc/bin-utils
 294 # ---------------------------------------------------------------------------
 295 #
 296 # When performing cross compilation for other architectures ARCH shall be set
 297 # to the target architecture. (See arch/* for the possibilities).
 298 # ARCH can be set during invocation of make:
 299 # make ARCH=ia64
 300 # Another way is to have ARCH set in the environment.
 301 # The default ARCH is the host where make is executed.
 302
 303 # CROSS_COMPILE specify the prefix used for all executables used
 304 # during compilation. Only gcc and related bin-utils executables
 305 # are prefixed with $(CROSS_COMPILE).
 306 # CROSS_COMPILE can be set on the command line
 307 # make CROSS_COMPILE=ia64-linux-
 308 # Alternatively CROSS_COMPILE can be set in the environment.
 309 # A third alternative is to store a setting in .config so that plain
 310 # "make" in the configured kernel build directory always uses that.
 311 # Default value for CROSS_COMPILE is not to prefix executables
 312 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 313 ARCH            ?= $(SUBARCH)
 314 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 315
 316 # Architecture as present in compile.h
 317 UTS_MACHINE     := $(ARCH)
 318 SRCARCH         := $(ARCH)
 319
 320 # Additional ARCH settings for x86
 321 ifeq ($(ARCH),i386)
 322         SRCARCH := x86
 323 endif
 324 ifeq ($(ARCH),x86_64)
 325         SRCARCH := x86
 326 endif
 327
 328 # Additional ARCH settings for sparc
 329 ifeq ($(ARCH),sparc32)
 330        SRCARCH := sparc
 331 endif
 332 ifeq ($(ARCH),sparc64)
 333        SRCARCH := sparc
 334 endif
 335
 336 # Additional ARCH settings for sh
 337 ifeq ($(ARCH),sh64)
 338        SRCARCH := sh
 339 endif
 340
 341 # Additional ARCH settings for tile
 342 ifeq ($(ARCH),tilepro)
 343        SRCARCH := tile
 344 endif
 345 ifeq ($(ARCH),tilegx)
 346        SRCARCH := tile
 347 endif
 348
 349 # Where to locate arch specific headers
 350 hdr-arch  := $(SRCARCH)
 351
 352 KCONFIG_CONFIG  ?= .config
 353 export KCONFIG_CONFIG
 354
 355 # SHELL used by kbuild
 356 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 357           else if [ -x /bin/bash ]; then echo /bin/bash; \
 358           else echo sh; fi ; fi)
 359
 360 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 361 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 362 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 363
 364 HOSTCC       = gcc
 365 HOSTCXX      = g++
 366 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 367                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 368 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 369 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 370 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 371
 372 # Make variables (CC, etc...)
 373 AS              = $(CROSS_COMPILE)as
 374 LD              = $(CROSS_COMPILE)ld
 375 CC              = $(CROSS_COMPILE)gcc
 376 CPP             = $(CC) -E
 377 AR              = $(CROSS_COMPILE)ar
 378 NM              = $(CROSS_COMPILE)nm
 379 STRIP           = $(CROSS_COMPILE)strip
 380 OBJCOPY         = $(CROSS_COMPILE)objcopy
 381 OBJDUMP         = $(CROSS_COMPILE)objdump
 382 AWK             = awk
 383 GENKSYMS        = scripts/genksyms/genksyms
 384 INSTALLKERNEL  := installkernel
 385 DEPMOD          = /sbin/depmod
 386 PERL            = perl
 387 PYTHON          = python
 388 CHECK           = sparse
 389
 390 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 391                   -Wbitwise -Wno-return-void $(CF)
 392 NOSTDINC_FLAGS  =
 393 CFLAGS_MODULE   =
 394 AFLAGS_MODULE   =
 395 LDFLAGS_MODULE  =
 396 CFLAGS_KERNEL   =
 397 AFLAGS_KERNEL   =
 398 LDFLAGS_vmlinux =
 399
 400 # Use USERINCLUDE when you must reference the UAPI directories only.
 401 USERINCLUDE    := \
 402                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 403                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 404                 -I$(srctree)/include/uapi \
 405                 -I$(objtree)/include/generated/uapi \
 406                 -include $(srctree)/include/linux/kconfig.h
 407
 408 # Use LINUXINCLUDE when you must reference the include/ directory.
 409 # Needed to be compatible with the O= option
 410 LINUXINCLUDE    := \
 411                 -I$(srctree)/arch/$(hdr-arch)/include \
 412                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 413                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 414                 -I$(objtree)/include \
 415                 $(USERINCLUDE)
 416
 417 KBUILD_AFLAGS   := -D__ASSEMBLY__
 418 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 419                    -fno-strict-aliasing -fno-common -fshort-wchar \
 420                    -Werror-implicit-function-declaration \
 421                    -Wno-format-security \
 422                    -std=gnu89
 423 KBUILD_CPPFLAGS := -D__KERNEL__
 424 KBUILD_AFLAGS_KERNEL :=
 425 KBUILD_CFLAGS_KERNEL :=
 426 KBUILD_AFLAGS_MODULE  := -DMODULE
 427 KBUILD_CFLAGS_MODULE  := -DMODULE
 428 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 429 GCC_PLUGINS_CFLAGS :=
 430
 431 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 432 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 433 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 434 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 435
 436 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 437 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 438 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 439 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 440 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 441 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 442 export KBUILD_ARFLAGS
 443
 444 # When compiling out-of-tree modules, put MODVERDIR in the module
 445 # tree rather than in the kernel tree. The kernel tree might
 446 # even be read-only.
 447 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 448
 449 # Files to ignore in find ... statements
 450
 451 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 452                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 453                           -prune -o
 454 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 455                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 456
 457 # ===========================================================================
 458 # Rules shared between *config targets and build targets
 459
 460 # Basic helpers built in scripts/basic/
 461 PHONY += scripts_basic
 462 scripts_basic:
 463         $(Q)$(MAKE) $(build)=scripts/basic
 464         $(Q)rm -f .tmp_quiet_recordmcount
 465
 466 # To avoid any implicit rule to kick in, define an empty command.
 467 scripts/basic/%: scripts_basic ;
 468
 469 PHONY += outputmakefile
 470 # outputmakefile generates a Makefile in the output directory, if using a
 471 # separate output directory. This allows convenient use of make in the
 472 # output directory.
 473 outputmakefile:
 474 ifneq ($(KBUILD_SRC),)
 475         $(Q)ln -fsn $(srctree) source
 476         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 477             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 478 endif
 479
 480 ifeq ($(cc-name),clang)
 481 ifneq ($(CROSS_COMPILE),)
 482 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 483 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
 484 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 485 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 486 endif
 487 ifneq ($(GCC_TOOLCHAIN),)
 488 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 489 endif
 490 CLANG_FLAGS     += -no-integrated-as
 491 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 492 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 493 export CLANG_FLAGS
 494 endif
 495
 496 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 497 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 498 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 499 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 500 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 501 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 502 export RETPOLINE_CFLAGS
 503 export RETPOLINE_VDSO_CFLAGS
 504
 505 ifeq ($(config-targets),1)
 506 # ===========================================================================
 507 # *config targets only - make sure prerequisites are updated, and descend
 508 # in scripts/kconfig to make the *config target
 509
 510 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 511 # KBUILD_DEFCONFIG may point out an alternative default configuration
 512 # used for 'make defconfig'
 513 include arch/$(SRCARCH)/Makefile
 514 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 515
 516 config: scripts_basic outputmakefile FORCE
 517         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 518
 519 %config: scripts_basic outputmakefile FORCE
 520         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 521
 522 else
 523 # ===========================================================================
 524 # Build targets only - this includes vmlinux, arch specific targets, clean
 525 # targets and others. In general all targets except *config targets.
 526
 527 # If building an external module we do not care about the all: rule
 528 # but instead _all depend on modules
 529 PHONY += all
 530 ifeq ($(KBUILD_EXTMOD),)
 531 _all: all
 532 else
 533 _all: modules
 534 endif
 535
 536 # Decide whether to build built-in, modular, or both.
 537 # Normally, just do built-in.
 538
 539 KBUILD_MODULES :=
 540 KBUILD_BUILTIN := 1
 541
 542 # If we have only "make modules", don't compile built-in objects.
 543 # When we're building modules with modversions, we need to consider
 544 # the built-in objects during the descend as well, in order to
 545 # make sure the checksums are up to date before we record them.
 546
 547 ifeq ($(MAKECMDGOALS),modules)
 548   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 549 endif
 550
 551 # If we have "make <whatever> modules", compile modules
 552 # in addition to whatever we do anyway.
 553 # Just "make" or "make all" shall build modules as well
 554
 555 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 556   KBUILD_MODULES := 1
 557 endif
 558
 559 ifeq ($(MAKECMDGOALS),)
 560   KBUILD_MODULES := 1
 561 endif
 562
 563 export KBUILD_MODULES KBUILD_BUILTIN
 564
 565 ifeq ($(KBUILD_EXTMOD),)
 566 # Additional helpers built in scripts/
 567 # Carefully list dependencies so we do not try to build scripts twice
 568 # in parallel
 569 PHONY += scripts
 570 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 571          asm-generic gcc-plugins
 572         $(Q)$(MAKE) $(build)=$(@)
 573
 574 # Objects we will link into vmlinux / subdirs we need to visit
 575 init-y          := init/
 576 drivers-y       := drivers/ sound/ firmware/
 577 net-y           := net/
 578 libs-y          := lib/
 579 core-y          := usr/
 580 virt-y          := virt/
 581 endif # KBUILD_EXTMOD
 582
 583 ifeq ($(dot-config),1)
 584 # Read in config
 585 -include include/config/auto.conf
 586
 587 ifeq ($(KBUILD_EXTMOD),)
 588 # Read in dependencies to all Kconfig* files, make sure to run
 589 # oldconfig if changes are detected.
 590 -include include/config/auto.conf.cmd
 591
 592 # To avoid any implicit rule to kick in, define an empty command
 593 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 594
 595 # If .config is newer than include/config/auto.conf, someone tinkered
 596 # with it and forgot to run make oldconfig.
 597 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 598 # we execute the config step to be sure to catch updated Kconfig files
 599 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 600         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 601 else
 602 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 603 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 604 PHONY += include/config/auto.conf
 605
 606 include/config/auto.conf:
 607         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 608         echo >&2;                                                       \
 609         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 610         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 611         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 612         echo >&2 ;                                                      \
 613         /bin/false)
 614
 615 endif # KBUILD_EXTMOD
 616
 617 else
 618 # Dummy target needed, because used as prerequisite
 619 include/config/auto.conf: ;
 620 endif # $(dot-config)
 621
 622 # For the kernel to actually contain only the needed exported symbols,
 623 # we have to build modules as well to determine what those symbols are.
 624 # (this can be evaluated only once include/config/auto.conf has been included)
 625 ifdef CONFIG_TRIM_UNUSED_KSYMS
 626   KBUILD_MODULES := 1
 627 endif
 628
 629 # The all: target is the default when no target is given on the
 630 # command line.
 631 # This allow a user to issue only 'make' to build a kernel including modules
 632 # Defaults to vmlinux, but the arch makefile usually adds further targets
 633 all: vmlinux
 634
 635 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 636 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 637 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 638 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 639 export CFLAGS_GCOV CFLAGS_KCOV
 640
 641 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 642 # values of the respective KBUILD_* variables
 643 ARCH_CPPFLAGS :=
 644 ARCH_AFLAGS :=
 645 ARCH_CFLAGS :=
 646 include arch/$(SRCARCH)/Makefile
 647
 648 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 649 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 650 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 651 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 652 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 653 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 654
 655 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 656 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 657 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 658 else
 659 ifdef CONFIG_PROFILE_ALL_BRANCHES
 660 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 661 else
 662 KBUILD_CFLAGS   += -O2
 663 endif
 664 endif
 665
 666 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 667                         $(call cc-disable-warning,maybe-uninitialized,))
 668
 669 # Tell gcc to never replace conditional load with a non-conditional one
 670 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 671
 672 # check for 'asm goto'
 673 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 674         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 675         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 676 endif
 677
 678 include scripts/Makefile.gcc-plugins
 679
 680 ifdef CONFIG_READABLE_ASM
 681 # Disable optimizations that make assembler listings hard to read.
 682 # reorder blocks reorders the control in the function
 683 # ipa clone creates specialized cloned functions
 684 # partial inlining inlines only parts of functions
 685 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 686                  $(call cc-option,-fno-ipa-cp-clone,) \
 687                  $(call cc-option,-fno-partial-inlining)
 688 endif
 689
 690 ifneq ($(CONFIG_FRAME_WARN),0)
 691 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 692 endif
 693
 694 # This selects the stack protector compiler flag. Testing it is delayed
 695 # until after .config has been reprocessed, in the prepare-compiler-check
 696 # target.
 697 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 698   stackp-flag := -fstack-protector
 699   stackp-name := REGULAR
 700 else
 701 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 702   stackp-flag := -fstack-protector-strong
 703   stackp-name := STRONG
 704 else
 705   # Force off for distro compilers that enable stack protector by default.
 706   stackp-flag := $(call cc-option, -fno-stack-protector)
 707 endif
 708 endif
 709 # Find arch-specific stack protector compiler sanity-checking script.
 710 ifdef CONFIG_CC_STACKPROTECTOR
 711   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 712   stackp-check := $(wildcard $(stackp-path))
 713 endif
 714 KBUILD_CFLAGS += $(stackp-flag)
 715
 716 ifeq ($(cc-name),clang)
 717 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 718 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 719 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 720 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 721 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 722 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 723 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 724 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 725 # See modpost pattern 2
 726 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 727 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 728 else
 729
 730 # These warnings generated too much noise in a regular build.
 731 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 732 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 733 endif
 734
 735 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 736 ifdef CONFIG_FRAME_POINTER
 737 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 738 else
 739 # Some targets (ARM with Thumb2, for example), can't be built with frame
 740 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 741 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 742 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 743 # -fomit-frame-pointer with FUNCTION_TRACER.
 744 ifndef CONFIG_FUNCTION_TRACER
 745 KBUILD_CFLAGS   += -fomit-frame-pointer
 746 endif
 747 endif
 748
 749 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 750
 751 ifdef CONFIG_DEBUG_INFO
 752 ifdef CONFIG_DEBUG_INFO_SPLIT
 753 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 754 else
 755 KBUILD_CFLAGS   += -g
 756 endif
 757 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 758 endif
 759 ifdef CONFIG_DEBUG_INFO_DWARF4
 760 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 761 endif
 762
 763 ifdef CONFIG_DEBUG_INFO_REDUCED
 764 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 765                    $(call cc-option,-fno-var-tracking)
 766 endif
 767
 768 ifdef CONFIG_FUNCTION_TRACER
 769 ifndef CC_FLAGS_FTRACE
 770 CC_FLAGS_FTRACE := -pg
 771 endif
 772 export CC_FLAGS_FTRACE
 773 ifdef CONFIG_HAVE_FENTRY
 774 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 775 endif
 776 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 777 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 778 ifdef CONFIG_DYNAMIC_FTRACE
 779         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 780                 BUILD_C_RECORDMCOUNT := y
 781                 export BUILD_C_RECORDMCOUNT
 782         endif
 783 endif
 784 endif
 785
 786 # We trigger additional mismatches with less inlining
 787 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 788 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 789 endif
 790
 791 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 792 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 793 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 794 endif
 795
 796 # arch Makefile may override CC so keep this after arch Makefile is included
 797 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 798 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 799
 800 # warn about C99 declaration after statement
 801 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 802
 803 # disable pointer signed / unsigned warnings in gcc 4.0
 804 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 805
 806 # disable stringop warnings in gcc 8+
 807 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 808
 809 # disable invalid "can't wrap" optimizations for signed / pointers
 810 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 811
 812 # clang sets -fmerge-all-constants by default as optimization, but this
 813 # is non-conforming behavior for C and in fact breaks the kernel, so we
 814 # need to disable it here generally.
 815 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 816
 817 # for gcc -fno-merge-all-constants disables everything, but it is fine
 818 # to have actual conforming behavior enabled.
 819 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 820
 821 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 822 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 823
 824 # conserve stack if available
 825 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 826
 827 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 828 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 829
 830 # require functions to have arguments in prototypes, not empty 'int foo()'
 831 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 832
 833 # Prohibit date/time macros, which would make the build non-deterministic
 834 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 835
 836 # enforce correct pointer usage
 837 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 838
 839 # Require designated initializers for all marked structures
 840 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 841
 842 # use the deterministic mode of AR if available
 843 KBUILD_ARFLAGS := $(call ar-option,D)
 844
 845 include scripts/Makefile.kasan
 846 include scripts/Makefile.extrawarn
 847 include scripts/Makefile.ubsan
 848
 849 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 850 # last assignments
 851 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 852 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 853 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 854
 855 # Use --build-id when available.
 856 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 857                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 858 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 859 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 860
 861 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 862 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 863 endif
 864
 865 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 866 LDFLAGS_vmlinux += $(call ld-option, -X,)
 867 endif
 868
 869 # Default kernel image to build when no specific target is given.
 870 # KBUILD_IMAGE may be overruled on the command line or
 871 # set in the environment
 872 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 873 # this default value
 874 export KBUILD_IMAGE ?= vmlinux
 875
 876 #
 877 # INSTALL_PATH specifies where to place the updated kernel and system map
 878 # images. Default is /boot, but you can set it to other values
 879 export  INSTALL_PATH ?= /boot
 880
 881 #
 882 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 883 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 884 # an argument if needed. Otherwise it defaults to the kernel install path
 885 #
 886 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 887
 888 #
 889 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 890 # relocations required by build roots.  This is not defined in the
 891 # makefile but the argument can be passed to make if needed.
 892 #
 893
 894 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 895 export MODLIB
 896
 897 #
 898 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 899 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 900 # the default option --strip-debug will be used.  Otherwise,
 901 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 902
 903 ifdef INSTALL_MOD_STRIP
 904 ifeq ($(INSTALL_MOD_STRIP),1)
 905 mod_strip_cmd = $(STRIP) --strip-debug
 906 else
 907 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 908 endif # INSTALL_MOD_STRIP=1
 909 else
 910 mod_strip_cmd = true
 911 endif # INSTALL_MOD_STRIP
 912 export mod_strip_cmd
 913
 914 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 915 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 916 # or CONFIG_MODULE_COMPRESS_XZ.
 917
 918 mod_compress_cmd = true
 919 ifdef CONFIG_MODULE_COMPRESS
 920   ifdef CONFIG_MODULE_COMPRESS_GZIP
 921     mod_compress_cmd = gzip -n -f
 922   endif # CONFIG_MODULE_COMPRESS_GZIP
 923   ifdef CONFIG_MODULE_COMPRESS_XZ
 924     mod_compress_cmd = xz -f
 925   endif # CONFIG_MODULE_COMPRESS_XZ
 926 endif # CONFIG_MODULE_COMPRESS
 927 export mod_compress_cmd
 928
 929 # Select initial ramdisk compression format, default is gzip(1).
 930 # This shall be used by the dracut(8) tool while creating an initramfs image.
 931 #
 932 INITRD_COMPRESS-y                  := gzip
 933 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 934 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 935 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 936 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 937 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 938 # do not export INITRD_COMPRESS, since we didn't actually
 939 # choose a sane default compression above.
 940 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 941
 942 ifdef CONFIG_MODULE_SIG_ALL
 943 $(eval $(call config_filename,MODULE_SIG_KEY))
 944
 945 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 946 else
 947 mod_sign_cmd = true
 948 endif
 949 export mod_sign_cmd
 950
 951 ifdef CONFIG_STACK_VALIDATION
 952   has_libelf := $(call try-run,\
 953                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 954   ifeq ($(has_libelf),1)
 955     objtool_target := tools/objtool FORCE
 956   else
 957     SKIP_STACK_VALIDATION := 1
 958     export SKIP_STACK_VALIDATION
 959   endif
 960 endif
 961
 962
 963 ifeq ($(KBUILD_EXTMOD),)
 964 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 965
 966 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 967                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 968                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 969
 970 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 971                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 972
 973 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 974 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 975 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 976 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 977 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 978 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
 979 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 980
 981 # Externally visible symbols (used by link-vmlinux.sh)
 982 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 983 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 984 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 985 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 986 export LDFLAGS_vmlinux
 987 # used by scripts/package/Makefile
 988 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 989
 990 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 991
 992 # Include targets which we want to execute sequentially if the rest of the
 993 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 994 # evaluated more than once.
 995 PHONY += vmlinux_prereq
 996 vmlinux_prereq: $(vmlinux-deps) FORCE
 997 ifdef CONFIG_HEADERS_CHECK
 998         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 999 endif
1000 ifdef CONFIG_GDB_SCRIPTS
1001         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1002 endif
1003 ifdef CONFIG_TRIM_UNUSED_KSYMS
1004         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1005           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1006 endif
1007
1008 # standalone target for easier testing
1009 include/generated/autoksyms.h: FORCE
1010         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1011
1012 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1013
1014 # Final link of vmlinux with optional arch pass after final link
1015 cmd_link-vmlinux =                                                 \
1016         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1017         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1018
1019 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1020         +$(call if_changed,link-vmlinux)
1021
1022 # Build samples along the rest of the kernel
1023 ifdef CONFIG_SAMPLES
1024 vmlinux-dirs += samples
1025 endif
1026
1027 # The actual objects are generated when descending,
1028 # make sure no implicit rule kicks in
1029 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1030
1031 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1032 # Preset locale variables to speed up the build process. Limit locale
1033 # tweaks to this spot to avoid wrong language settings when running
1034 # make menuconfig etc.
1035 # Error messages still appears in the original language
1036
1037 PHONY += $(vmlinux-dirs)
1038 $(vmlinux-dirs): prepare scripts
1039         $(Q)$(MAKE) $(build)=$@
1040
1041 define filechk_kernel.release
1042         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1043 endef
1044
1045 # Store (new) KERNELRELEASE string in include/config/kernel.release
1046 include/config/kernel.release: include/config/auto.conf FORCE
1047         $(call filechk,kernel.release)
1048
1049
1050 # Things we need to do before we recursively start building the kernel
1051 # or the modules are listed in "prepare".
1052 # A multi level approach is used. prepareN is processed before prepareN-1.
1053 # archprepare is used in arch Makefiles and when processed asm symlink,
1054 # version.h and scripts_basic is processed / created.
1055
1056 # Listed in dependency order
1057 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1058
1059 # prepare3 is used to check if we are building in a separate output directory,
1060 # and if so do:
1061 # 1) Check that make has not been executed in the kernel src $(srctree)
1062 prepare3: include/config/kernel.release
1063 ifneq ($(KBUILD_SRC),)
1064         @$(kecho) '  Using $(srctree) as source for kernel'
1065         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1066                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1067                 echo >&2 "  in the '$(srctree)' directory.";\
1068                 /bin/false; \
1069         fi;
1070 endif
1071
1072 # prepare2 creates a makefile if using a separate output directory.
1073 # From this point forward, .config has been reprocessed, so any rules
1074 # that need to depend on updated CONFIG_* values can be checked here.
1075 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1076
1077 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1078                    include/config/auto.conf
1079         $(cmd_crmodverdir)
1080
1081 archprepare: archheaders archscripts prepare1 scripts_basic
1082
1083 prepare0: archprepare gcc-plugins
1084         $(Q)$(MAKE) $(build)=.
1085
1086 # All the preparing..
1087 prepare: prepare0 prepare-objtool
1088
1089 # Support for using generic headers in asm-generic
1090 PHONY += asm-generic uapi-asm-generic
1091 asm-generic: uapi-asm-generic
1092         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1093                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1094 uapi-asm-generic:
1095         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1096                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1097
1098 PHONY += prepare-objtool
1099 prepare-objtool: $(objtool_target)
1100 ifeq ($(SKIP_STACK_VALIDATION),1)
1101 ifdef CONFIG_UNWINDER_ORC
1102         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1103         @false
1104 else
1105         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1106 endif
1107 endif
1108
1109 # Check for CONFIG flags that require compiler support. Abort the build
1110 # after .config has been processed, but before the kernel build starts.
1111 #
1112 # For security-sensitive CONFIG options, we don't want to fallback and/or
1113 # silently change which compiler flags will be used, since that leads to
1114 # producing kernels with different security feature characteristics
1115 # depending on the compiler used. (For example, "But I selected
1116 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1117 PHONY += prepare-compiler-check
1118 prepare-compiler-check: FORCE
1119 # Make sure compiler supports requested stack protector flag.
1120 ifdef stackp-name
1121   ifeq ($(call cc-option, $(stackp-flag)),)
1122         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1123                   $(stackp-flag) not supported by compiler >&2 && exit 1
1124   endif
1125 endif
1126 # Make sure compiler does not have buggy stack-protector support.
1127 ifdef stackp-check
1128   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1129         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1130                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1131   endif
1132 endif
1133         @:
1134
1135 # Generate some files
1136 # ---------------------------------------------------------------------------
1137
1138 # KERNELRELEASE can change from a few different places, meaning version.h
1139 # needs to be updated, so this check is forced on all builds
1140
1141 uts_len := 64
1142 define filechk_utsrelease.h
1143         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1144           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1145           exit 1;                                                         \
1146         fi;                                                               \
1147         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1148 endef
1149
1150 define filechk_version.h
1151         (echo \#define LINUX_VERSION_CODE $(shell                         \
1152         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1153         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1154 endef
1155
1156 $(version_h): $(srctree)/Makefile FORCE
1157         $(call filechk,version.h)
1158         $(Q)rm -f $(old_version_h)
1159
1160 include/generated/utsrelease.h: include/config/kernel.release FORCE
1161         $(call filechk,utsrelease.h)
1162
1163 PHONY += headerdep
1164 headerdep:
1165         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1166         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1167
1168 # ---------------------------------------------------------------------------
1169 # Kernel headers
1170
1171 #Default location for installed headers
1172 export INSTALL_HDR_PATH = $(objtree)/usr
1173
1174 # If we do an all arch process set dst to include/arch-$(hdr-arch)
1175 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
1176
1177 PHONY += archheaders
1178 archheaders:
1179
1180 PHONY += archscripts
1181 archscripts:
1182
1183 PHONY += __headers
1184 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1185         $(Q)$(MAKE) $(build)=scripts build_unifdef
1186
1187 PHONY += headers_install_all
1188 headers_install_all:
1189         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1190
1191 PHONY += headers_install
1192 headers_install: __headers
1193         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1194           $(error Headers not exportable for the $(SRCARCH) architecture))
1195         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1196         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
1197
1198 PHONY += headers_check_all
1199 headers_check_all: headers_install_all
1200         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1201
1202 PHONY += headers_check
1203 headers_check: headers_install
1204         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1205         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
1206
1207 # ---------------------------------------------------------------------------
1208 # Kernel selftest
1209
1210 PHONY += kselftest
1211 kselftest:
1212         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1213
1214 PHONY += kselftest-clean
1215 kselftest-clean:
1216         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1217
1218 PHONY += kselftest-merge
1219 kselftest-merge:
1220         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1221         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1222                 -m $(objtree)/.config \
1223                 $(srctree)/tools/testing/selftests/*/config
1224         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1225
1226 # ---------------------------------------------------------------------------
1227 # Modules
1228
1229 ifdef CONFIG_MODULES
1230
1231 # By default, build modules as well
1232
1233 all: modules
1234
1235 # Build modules
1236 #
1237 # A module can be listed more than once in obj-m resulting in
1238 # duplicate lines in modules.order files.  Those are removed
1239 # using awk while concatenating to the final file.
1240
1241 PHONY += modules
1242 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1243         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1244         @$(kecho) '  Building modules, stage 2.';
1245         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1246
1247 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1248         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1249
1250 %/modules.builtin: include/config/auto.conf
1251         $(Q)$(MAKE) $(modbuiltin)=$*
1252
1253
1254 # Target to prepare building external modules
1255 PHONY += modules_prepare
1256 modules_prepare: prepare scripts
1257
1258 # Target to install modules
1259 PHONY += modules_install
1260 modules_install: _modinst_ _modinst_post
1261
1262 PHONY += _modinst_
1263 _modinst_:
1264         @rm -rf $(MODLIB)/kernel
1265         @rm -f $(MODLIB)/source
1266         @mkdir -p $(MODLIB)/kernel
1267         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1268         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1269                 rm -f $(MODLIB)/build ; \
1270                 ln -s $(CURDIR) $(MODLIB)/build ; \
1271         fi
1272         @cp -f $(objtree)/modules.order $(MODLIB)/
1273         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1274         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1275
1276 # This depmod is only for convenience to give the initial
1277 # boot a modules.dep even before / is mounted read-write.  However the
1278 # boot script depmod is the master version.
1279 PHONY += _modinst_post
1280 _modinst_post: _modinst_
1281         $(call cmd,depmod)
1282
1283 ifeq ($(CONFIG_MODULE_SIG), y)
1284 PHONY += modules_sign
1285 modules_sign:
1286         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1287 endif
1288
1289 else # CONFIG_MODULES
1290
1291 # Modules not configured
1292 # ---------------------------------------------------------------------------
1293
1294 PHONY += modules modules_install
1295 modules modules_install:
1296         @echo >&2
1297         @echo >&2 "The present kernel configuration has modules disabled."
1298         @echo >&2 "Type 'make config' and enable loadable module support."
1299         @echo >&2 "Then build a kernel with module support enabled."
1300         @echo >&2
1301         @exit 1
1302
1303 endif # CONFIG_MODULES
1304
1305 ###
1306 # Cleaning is done on three levels.
1307 # make clean     Delete most generated files
1308 #                Leave enough to build external modules
1309 # make mrproper  Delete the current configuration, and all generated files
1310 # make distclean Remove editor backup files, patch leftover files and the like
1311
1312 # Directories & files removed with 'make clean'
1313 CLEAN_DIRS  += $(MODVERDIR)
1314
1315 # Directories & files removed with 'make mrproper'
1316 MRPROPER_DIRS  += include/config usr/include include/generated          \
1317                   arch/*/include/generated .tmp_objdiff
1318 MRPROPER_FILES += .config .config.old .version .old_version \
1319                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1320                   signing_key.pem signing_key.priv signing_key.x509     \
1321                   x509.genkey extra_certificates signing_key.x509.keyid \
1322                   signing_key.x509.signer vmlinux-gdb.py
1323
1324 # clean - Delete most, but leave enough to build external modules
1325 #
1326 clean: rm-dirs  := $(CLEAN_DIRS)
1327 clean: rm-files := $(CLEAN_FILES)
1328 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1329
1330 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1331 $(clean-dirs):
1332         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1333
1334 vmlinuxclean:
1335         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1336         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1337
1338 clean: archclean vmlinuxclean
1339
1340 # mrproper - Delete all generated files, including .config
1341 #
1342 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1343 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1344 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1345
1346 PHONY += $(mrproper-dirs) mrproper archmrproper
1347 $(mrproper-dirs):
1348         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1349
1350 mrproper: clean archmrproper $(mrproper-dirs)
1351         $(call cmd,rmdirs)
1352         $(call cmd,rmfiles)
1353
1354 # distclean
1355 #
1356 PHONY += distclean
1357
1358 distclean: mrproper
1359         @find $(srctree) $(RCS_FIND_IGNORE) \
1360                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1361                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1362                 -o -name 'core' \) \
1363                 -type f -print | xargs rm -f
1364
1365
1366 # Packaging of the kernel to various formats
1367 # ---------------------------------------------------------------------------
1368 # rpm target kept for backward compatibility
1369 package-dir     := scripts/package
1370
1371 %src-pkg: FORCE
1372         $(Q)$(MAKE) $(build)=$(package-dir) $@
1373 %pkg: include/config/kernel.release FORCE
1374         $(Q)$(MAKE) $(build)=$(package-dir) $@
1375 rpm: include/config/kernel.release FORCE
1376         $(Q)$(MAKE) $(build)=$(package-dir) $@
1377
1378
1379 # Brief documentation of the typical targets used
1380 # ---------------------------------------------------------------------------
1381
1382 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1383 boards := $(sort $(notdir $(boards)))
1384 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1385 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1386
1387 PHONY += help
1388 help:
1389         @echo  'Cleaning targets:'
1390         @echo  '  clean           - Remove most generated files but keep the config and'
1391         @echo  '                    enough build support to build external modules'
1392         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1393         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1394         @echo  ''
1395         @echo  'Configuration targets:'
1396         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1397         @echo  ''
1398         @echo  'Other generic targets:'
1399         @echo  '  all             - Build all targets marked with [*]'
1400         @echo  '* vmlinux         - Build the bare kernel'
1401         @echo  '* modules         - Build all modules'
1402         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1403         @echo  '  dir/            - Build all files in dir and below'
1404         @echo  '  dir/file.[ois]  - Build specified target only'
1405         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1406         @echo  '                    (requires compiler support for LLVM assembly generation)'
1407         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1408         @echo  '                    (requires a recent binutils and recent build (System.map))'
1409         @echo  '  dir/file.ko     - Build module including final link'
1410         @echo  '  modules_prepare - Set up for building external modules'
1411         @echo  '  tags/TAGS       - Generate tags file for editors'
1412         @echo  '  cscope          - Generate cscope index'
1413         @echo  '  gtags           - Generate GNU GLOBAL index'
1414         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1415         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1416         @echo  '  image_name      - Output the image name (use with make -s)'
1417         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1418          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1419          echo  ''
1420         @echo  'Static analysers:'
1421         @echo  '  checkstack      - Generate a list of stack hogs'
1422         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1423         @echo  '  versioncheck    - Sanity check on version.h usage'
1424         @echo  '  includecheck    - Check for duplicate included header files'
1425         @echo  '  export_report   - List the usages of all exported symbols'
1426         @echo  '  headers_check   - Sanity check on exported headers'
1427         @echo  '  headerdep       - Detect inclusion cycles in headers'
1428         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1429         @echo  ''
1430         @echo  'Kernel selftest:'
1431         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1432         @echo  '                    Build, install, and boot kernel before'
1433         @echo  '                    running kselftest on it'
1434         @echo  '  kselftest-clean - Remove all generated kselftest files'
1435         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1436         @echo  '                    .config.'
1437         @echo  ''
1438         @echo 'Userspace tools targets:'
1439         @echo '  use "make tools/help"'
1440         @echo '  or  "cd tools; make help"'
1441         @echo  ''
1442         @echo  'Kernel packaging:'
1443         @$(MAKE) $(build)=$(package-dir) help
1444         @echo  ''
1445         @echo  'Documentation targets:'
1446         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1447         @echo  ''
1448         @echo  'Architecture specific targets ($(SRCARCH)):'
1449         @$(if $(archhelp),$(archhelp),\
1450                 echo '  No architecture specific help defined for $(SRCARCH)')
1451         @echo  ''
1452         @$(if $(boards), \
1453                 $(foreach b, $(boards), \
1454                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1455                 echo '')
1456         @$(if $(board-dirs), \
1457                 $(foreach b, $(board-dirs), \
1458                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1459                 printf "  %-16s - Show all of the above\\n" help-boards; \
1460                 echo '')
1461
1462         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1463         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1464         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1465         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1466         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1467         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1468         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1469         @echo  '                1: warnings which may be relevant and do not occur too often'
1470         @echo  '                2: warnings which occur quite often but may still be relevant'
1471         @echo  '                3: more obscure warnings, can most likely be ignored'
1472         @echo  '                Multiple levels can be combined with W=12 or W=123'
1473         @echo  ''
1474         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1475         @echo  'For further info see the ./README file'
1476
1477
1478 help-board-dirs := $(addprefix help-,$(board-dirs))
1479
1480 help-boards: $(help-board-dirs)
1481
1482 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1483
1484 $(help-board-dirs): help-%:
1485         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1486         @$(if $(boards-per-dir), \
1487                 $(foreach b, $(boards-per-dir), \
1488                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1489                 echo '')
1490
1491
1492 # Documentation targets
1493 # ---------------------------------------------------------------------------
1494 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
1495 PHONY += $(DOC_TARGETS)
1496 $(DOC_TARGETS): scripts_basic FORCE
1497         $(Q)$(MAKE) $(build)=Documentation $@
1498
1499 else # KBUILD_EXTMOD
1500
1501 ###
1502 # External module support.
1503 # When building external modules the kernel used as basis is considered
1504 # read-only, and no consistency checks are made and the make
1505 # system is not used on the basis kernel. If updates are required
1506 # in the basis kernel ordinary make commands (without M=...) must
1507 # be used.
1508 #
1509 # The following are the only valid targets when building external
1510 # modules.
1511 # make M=dir clean     Delete all automatically generated files
1512 # make M=dir modules   Make all modules in specified dir
1513 # make M=dir           Same as 'make M=dir modules'
1514 # make M=dir modules_install
1515 #                      Install the modules built in the module directory
1516 #                      Assumes install directory is already created
1517
1518 # We are always building modules
1519 KBUILD_MODULES := 1
1520 PHONY += crmodverdir
1521 crmodverdir:
1522         $(cmd_crmodverdir)
1523
1524 PHONY += $(objtree)/Module.symvers
1525 $(objtree)/Module.symvers:
1526         @test -e $(objtree)/Module.symvers || ( \
1527         echo; \
1528         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1529         echo "           is missing; modules will have no dependencies and modversions."; \
1530         echo )
1531
1532 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1533 PHONY += $(module-dirs) modules
1534 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1535         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1536
1537 modules: $(module-dirs)
1538         @$(kecho) '  Building modules, stage 2.';
1539         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1540
1541 PHONY += modules_install
1542 modules_install: _emodinst_ _emodinst_post
1543
1544 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1545 PHONY += _emodinst_
1546 _emodinst_:
1547         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1548         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1549
1550 PHONY += _emodinst_post
1551 _emodinst_post: _emodinst_
1552         $(call cmd,depmod)
1553
1554 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1555
1556 PHONY += $(clean-dirs) clean
1557 $(clean-dirs):
1558         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1559
1560 clean:  rm-dirs := $(MODVERDIR)
1561 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1562
1563 PHONY += help
1564 help:
1565         @echo  '  Building external modules.'
1566         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1567         @echo  ''
1568         @echo  '  modules         - default target, build the module(s)'
1569         @echo  '  modules_install - install the module'
1570         @echo  '  clean           - remove generated files in module directory only'
1571         @echo  ''
1572
1573 # Dummies...
1574 PHONY += prepare scripts
1575 prepare: ;
1576 scripts: ;
1577 endif # KBUILD_EXTMOD
1578
1579 clean: $(clean-dirs)
1580         $(call cmd,rmdirs)
1581         $(call cmd,rmfiles)
1582         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1583                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1584                 -o -name '*.ko.*' \
1585                 -o -name '*.dwo'  \
1586                 -o -name '*.su'  \
1587                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1588                 -o -name '*.symtypes' -o -name 'modules.order' \
1589                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1590                 -o -name '*.c.[012]*.*' \
1591                 -o -name '*.ll' \
1592                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1593
1594 # Generate tags for editors
1595 # ---------------------------------------------------------------------------
1596 quiet_cmd_tags = GEN     $@
1597       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1598
1599 tags TAGS cscope gtags: FORCE
1600         $(call cmd,tags)
1601
1602 # Scripts to check various things for consistency
1603 # ---------------------------------------------------------------------------
1604
1605 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1606
1607 includecheck:
1608         find $(srctree)/* $(RCS_FIND_IGNORE) \
1609                 -name '*.[hcS]' -type f -print | sort \
1610                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1611
1612 versioncheck:
1613         find $(srctree)/* $(RCS_FIND_IGNORE) \
1614                 -name '*.[hcS]' -type f -print | sort \
1615                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1616
1617 coccicheck:
1618         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1619
1620 namespacecheck:
1621         $(PERL) $(srctree)/scripts/namespace.pl
1622
1623 export_report:
1624         $(PERL) $(srctree)/scripts/export_report.pl
1625
1626 endif #ifeq ($(config-targets),1)
1627 endif #ifeq ($(mixed-targets),1)
1628
1629 PHONY += checkstack kernelrelease kernelversion image_name
1630
1631 # UML needs a little special treatment here.  It wants to use the host
1632 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1633 # else wants $(ARCH), including people doing cross-builds, which means
1634 # that $(SUBARCH) doesn't work here.
1635 ifeq ($(ARCH), um)
1636 CHECKSTACK_ARCH := $(SUBARCH)
1637 else
1638 CHECKSTACK_ARCH := $(ARCH)
1639 endif
1640 checkstack:
1641         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1642         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1643
1644 kernelrelease:
1645         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1646
1647 kernelversion:
1648         @echo $(KERNELVERSION)
1649
1650 image_name:
1651         @echo $(KBUILD_IMAGE)
1652
1653 # Clear a bunch of variables before executing the submake
1654 tools/: FORCE
1655         $(Q)mkdir -p $(objtree)/tools
1656         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1657
1658 tools/%: FORCE
1659         $(Q)mkdir -p $(objtree)/tools
1660         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1661
1662 # Single targets
1663 # ---------------------------------------------------------------------------
1664 # Single targets are compatible with:
1665 # - build with mixed source and output
1666 # - build with separate output dir 'make O=...'
1667 # - external modules
1668 #
1669 #  target-dir => where to store outputfile
1670 #  build-dir  => directory in kernel source tree to use
1671
1672 ifeq ($(KBUILD_EXTMOD),)
1673         build-dir  = $(patsubst %/,%,$(dir $@))
1674         target-dir = $(dir $@)
1675 else
1676         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1677         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1678         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1679 endif
1680
1681 %.s: %.c prepare scripts FORCE
1682         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1683 %.i: %.c prepare scripts FORCE
1684         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1685 %.o: %.c prepare scripts FORCE
1686         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1687 %.lst: %.c prepare scripts FORCE
1688         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1689 %.s: %.S prepare scripts FORCE
1690         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1691 %.o: %.S prepare scripts FORCE
1692         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1693 %.symtypes: %.c prepare scripts FORCE
1694         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1695 %.ll: %.c prepare scripts FORCE
1696         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1697
1698 # Modules
1699 /: prepare scripts FORCE
1700         $(cmd_crmodverdir)
1701         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1702         $(build)=$(build-dir)
1703 # Make sure the latest headers are built for Documentation
1704 Documentation/ samples/: headers_install
1705 %/: prepare scripts FORCE
1706         $(cmd_crmodverdir)
1707         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1708         $(build)=$(build-dir)
1709 %.ko: prepare scripts FORCE
1710         $(cmd_crmodverdir)
1711         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1712         $(build)=$(build-dir) $(@:.ko=.o)
1713         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1714
1715 # FIXME Should go into a make.lib or something
1716 # ===========================================================================
1717
1718 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1719       cmd_rmdirs = rm -rf $(rm-dirs)
1720
1721 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1722       cmd_rmfiles = rm -f $(rm-files)
1723
1724 # Run depmod only if we have System.map and depmod is executable
1725 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1726       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1727                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1728
1729 # Create temporary dir for module support files
1730 # clean it up only when building all modules
1731 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1732                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1733
1734 # read all saved command lines
1735
1736 targets := $(wildcard $(sort $(targets)))
1737 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1738
1739 ifneq ($(cmd_files),)
1740   $(cmd_files): ;       # Do not try to update included dependency files
1741   include $(cmd_files)
1742 endif
1743
1744 endif   # skip-makefile
1745
1746 PHONY += FORCE
1747 FORCE:
1748
1749 # Declare the contents of the .PHONY variable as phony.  We keep that
1750 # information in a variable so we can use it in if_changed and friends.
1751 .PHONY: $(PHONY)