Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 1
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc1
   6 NAME = Shy Crocodile
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # We are using a recursive build, so we need to do a little thinking
  19 # to get the ordering right.
  20 #
  21 # Most importantly: sub-Makefiles should only ever modify files in
  22 # their own directory. If in some directory we have a dependency on
  23 # a file in another dir (which doesn't happen often, but it's often
  24 # unavoidable when linking the built-in.a targets which finally
  25 # turn into vmlinux), we will call a sub make in that other dir, and
  26 # after that we are sure that everything which is in that other dir
  27 # is now up to date.
  28 #
  29 # The only cases where we need to modify files which have global
  30 # effects are thus separated out and done before the recursive
  31 # descending is started. They are now explicitly listed as the
  32 # prepare rule.
  33
  34 # Ugly workaround for Debian make-kpkg:
  35 # make-kpkg directly includes the top Makefile of Linux kernel. In such a case,
  36 # skip sub-make to support debian_* targets in ruleset/kernel_version.mk, but
  37 # displays warning to discourage such abusage.
  38 ifneq ($(word 2, $(MAKEFILE_LIST)),)
  39 $(warning Do not include top Makefile of Linux Kernel)
  40 sub-make-done := 1
  41 MAKEFLAGS += -rR
  42 endif
  43
  44 ifneq ($(sub-make-done),1)
  45
  46 # Do not use make's built-in rules and variables
  47 # (this increases performance and avoids hard-to-debug behaviour)
  48 MAKEFLAGS += -rR
  49
  50 # 'MAKEFLAGS += -rR' does not become immediately effective for old
  51 # GNU Make versions. Cancel implicit rules for this Makefile.
  52 $(lastword $(MAKEFILE_LIST)): ;
  53
  54 # Avoid funny character set dependencies
  55 unexport LC_ALL
  56 LC_COLLATE=C
  57 LC_NUMERIC=C
  58 export LC_COLLATE LC_NUMERIC
  59
  60 # Avoid interference with shell env settings
  61 unexport GREP_OPTIONS
  62
  63 # Beautify output
  64 # ---------------------------------------------------------------------------
  65 #
  66 # Normally, we echo the whole command before executing it. By making
  67 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  68 # $(quiet) to choose other forms of output instead, e.g.
  69 #
  70 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  71 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  72 #
  73 # If $(quiet) is empty, the whole command will be printed.
  74 # If it is set to "quiet_", only the short version will be printed.
  75 # If it is set to "silent_", nothing will be printed at all, since
  76 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  77 #
  78 # A simple variant is to prefix commands with $(Q) - that's useful
  79 # for commands that shall be hidden in non-verbose mode.
  80 #
  81 #       $(Q)ln $@ :<
  82 #
  83 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  84 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  85 #
  86 # To put more focus on warnings, be less verbose as default
  87 # Use 'make V=1' to see the full commands
  88
  89 ifeq ("$(origin V)", "command line")
  90   KBUILD_VERBOSE = $(V)
  91 endif
  92 ifndef KBUILD_VERBOSE
  93   KBUILD_VERBOSE = 0
  94 endif
  95
  96 ifeq ($(KBUILD_VERBOSE),1)
  97   quiet =
  98   Q =
  99 else
 100   quiet=quiet_
 101   Q = @
 102 endif
 103
 104 # If the user is running make -s (silent mode), suppress echoing of
 105 # commands
 106
 107 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
 108   quiet=silent_
 109 endif
 110
 111 export quiet Q KBUILD_VERBOSE
 112
 113 # kbuild supports saving output files in a separate directory.
 114 # To locate output files in a separate directory two syntaxes are supported.
 115 # In both cases the working directory must be the root of the kernel src.
 116 # 1) O=
 117 # Use "make O=dir/to/store/output/files/"
 118 #
 119 # 2) Set KBUILD_OUTPUT
 120 # Set the environment variable KBUILD_OUTPUT to point to the directory
 121 # where the output files shall be placed.
 122 # export KBUILD_OUTPUT=dir/to/store/output/files/
 123 # make
 124 #
 125 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 126 # variable.
 127
 128 # KBUILD_SRC is not intended to be used by the regular user (for now),
 129 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 130
 131 # OK, Make called in directory where kernel src resides
 132 # Do we want to locate output files in a separate directory?
 133 ifeq ("$(origin O)", "command line")
 134   KBUILD_OUTPUT := $(O)
 135 endif
 136
 137 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 138   $(error main directory cannot contain spaces nor colons)
 139 endif
 140
 141 ifneq ($(KBUILD_OUTPUT),)
 142 # check that the output directory actually exists
 143 saved-output := $(KBUILD_OUTPUT)
 144 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 145                                                                 && pwd)
 146 $(if $(KBUILD_OUTPUT),, \
 147      $(error failed to create output directory "$(saved-output)"))
 148
 149 # Look for make include files relative to root of kernel src
 150 #
 151 # This does not become effective immediately because MAKEFLAGS is re-parsed
 152 # once after the Makefile is read.  It is OK since we are going to invoke
 153 # 'sub-make' below.
 154 MAKEFLAGS += --include-dir=$(CURDIR)
 155
 156 else
 157
 158 # Do not print "Entering directory ..." at all for in-tree build.
 159 MAKEFLAGS += --no-print-directory
 160
 161 endif # ifneq ($(KBUILD_OUTPUT),)
 162
 163 PHONY += $(MAKECMDGOALS) sub-make
 164
 165 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 166         @:
 167
 168 # Invoke a second make in the output directory, passing relevant variables
 169 sub-make:
 170         $(Q)$(MAKE) sub-make-done=1 \
 171         $(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \
 172         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 173
 174 else # sub-make-done
 175 # We process the rest of the Makefile if this is the final invocation of make
 176
 177 # Do not print "Entering directory ...",
 178 # but we want to display it when entering to the output directory
 179 # so that IDEs/editors are able to understand relative filenames.
 180 MAKEFLAGS += --no-print-directory
 181
 182 # Call a source code checker (by default, "sparse") as part of the
 183 # C compilation.
 184 #
 185 # Use 'make C=1' to enable checking of only re-compiled files.
 186 # Use 'make C=2' to enable checking of *all* source files, regardless
 187 # of whether they are re-compiled or not.
 188 #
 189 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 190 # including where to get the "sparse" utility.
 191
 192 ifeq ("$(origin C)", "command line")
 193   KBUILD_CHECKSRC = $(C)
 194 endif
 195 ifndef KBUILD_CHECKSRC
 196   KBUILD_CHECKSRC = 0
 197 endif
 198
 199 # Use make M=dir to specify directory of external module to build
 200 # Old syntax make ... SUBDIRS=$PWD is still supported
 201 # Setting the environment variable KBUILD_EXTMOD take precedence
 202 ifdef SUBDIRS
 203   $(warning ================= WARNING ================)
 204   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 205   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 206   $(warning ==========================================)
 207   KBUILD_EXTMOD ?= $(SUBDIRS)
 208 endif
 209
 210 ifeq ("$(origin M)", "command line")
 211   KBUILD_EXTMOD := $(M)
 212 endif
 213
 214 ifeq ($(KBUILD_SRC),)
 215         # building in the source tree
 216         srctree := .
 217 else
 218         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 219                 # building in a subdirectory of the source tree
 220                 srctree := ..
 221         else
 222                 srctree := $(KBUILD_SRC)
 223         endif
 224 endif
 225
 226 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 227
 228 objtree         := .
 229 src             := $(srctree)
 230 obj             := $(objtree)
 231
 232 VPATH           := $(srctree)
 233
 234 export srctree objtree VPATH
 235
 236 # To make sure we do not include .config for any of the *config targets
 237 # catch them early, and hand them over to scripts/kconfig/Makefile
 238 # It is allowed to specify more targets when calling make, including
 239 # mixing *config targets and build targets.
 240 # For example 'make oldconfig all'.
 241 # Detect when mixed targets is specified, and make a second invocation
 242 # of make so .config is not included in this case either (for *config).
 243
 244 version_h := include/generated/uapi/linux/version.h
 245 old_version_h := include/linux/version.h
 246
 247 clean-targets := %clean mrproper cleandocs
 248 no-dot-config-targets := $(clean-targets) \
 249                          cscope gtags TAGS tags help% %docs check% coccicheck \
 250                          $(version_h) headers_% archheaders archscripts \
 251                          %asm-generic kernelversion %src-pkg
 252 no-sync-config-targets := $(no-dot-config-targets) install %install \
 253                            kernelrelease
 254
 255 config-targets  := 0
 256 mixed-targets   := 0
 257 dot-config      := 1
 258 may-sync-config := 1
 259
 260 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 261         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 262                 dot-config := 0
 263         endif
 264 endif
 265
 266 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 267         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 268                 may-sync-config := 0
 269         endif
 270 endif
 271
 272 ifneq ($(KBUILD_EXTMOD),)
 273         may-sync-config := 0
 274 endif
 275
 276 ifeq ($(KBUILD_EXTMOD),)
 277         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 278                 config-targets := 1
 279                 ifneq ($(words $(MAKECMDGOALS)),1)
 280                         mixed-targets := 1
 281                 endif
 282         endif
 283 endif
 284
 285 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 286 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 287         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 288                 mixed-targets := 1
 289         endif
 290 endif
 291
 292 # install and modules_install need also be processed one by one
 293 ifneq ($(filter install,$(MAKECMDGOALS)),)
 294         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 295                 mixed-targets := 1
 296         endif
 297 endif
 298
 299 ifeq ($(mixed-targets),1)
 300 # ===========================================================================
 301 # We're called with mixed targets (*config and build targets).
 302 # Handle them one by one.
 303
 304 PHONY += $(MAKECMDGOALS) __build_one_by_one
 305
 306 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 307         @:
 308
 309 __build_one_by_one:
 310         $(Q)set -e; \
 311         for i in $(MAKECMDGOALS); do \
 312                 $(MAKE) -f $(srctree)/Makefile $$i; \
 313         done
 314
 315 else
 316
 317 include scripts/Kbuild.include
 318
 319 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 320 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 321 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 322 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 323
 324 include scripts/subarch.include
 325
 326 # Cross compiling and selecting different set of gcc/bin-utils
 327 # ---------------------------------------------------------------------------
 328 #
 329 # When performing cross compilation for other architectures ARCH shall be set
 330 # to the target architecture. (See arch/* for the possibilities).
 331 # ARCH can be set during invocation of make:
 332 # make ARCH=ia64
 333 # Another way is to have ARCH set in the environment.
 334 # The default ARCH is the host where make is executed.
 335
 336 # CROSS_COMPILE specify the prefix used for all executables used
 337 # during compilation. Only gcc and related bin-utils executables
 338 # are prefixed with $(CROSS_COMPILE).
 339 # CROSS_COMPILE can be set on the command line
 340 # make CROSS_COMPILE=ia64-linux-
 341 # Alternatively CROSS_COMPILE can be set in the environment.
 342 # Default value for CROSS_COMPILE is not to prefix executables
 343 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 344 ARCH            ?= $(SUBARCH)
 345
 346 # Architecture as present in compile.h
 347 UTS_MACHINE     := $(ARCH)
 348 SRCARCH         := $(ARCH)
 349
 350 # Additional ARCH settings for x86
 351 ifeq ($(ARCH),i386)
 352         SRCARCH := x86
 353 endif
 354 ifeq ($(ARCH),x86_64)
 355         SRCARCH := x86
 356 endif
 357
 358 # Additional ARCH settings for sparc
 359 ifeq ($(ARCH),sparc32)
 360        SRCARCH := sparc
 361 endif
 362 ifeq ($(ARCH),sparc64)
 363        SRCARCH := sparc
 364 endif
 365
 366 # Additional ARCH settings for sh
 367 ifeq ($(ARCH),sh64)
 368        SRCARCH := sh
 369 endif
 370
 371 KCONFIG_CONFIG  ?= .config
 372 export KCONFIG_CONFIG
 373
 374 # SHELL used by kbuild
 375 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 376           else if [ -x /bin/bash ]; then echo /bin/bash; \
 377           else echo sh; fi ; fi)
 378
 379 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 380 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 381 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 382
 383 HOSTCC       = gcc
 384 HOSTCXX      = g++
 385 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 386                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 387                 $(HOSTCFLAGS)
 388 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 389 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 390 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 391
 392 # Make variables (CC, etc...)
 393 AS              = $(CROSS_COMPILE)as
 394 LD              = $(CROSS_COMPILE)ld
 395 CC              = $(CROSS_COMPILE)gcc
 396 CPP             = $(CC) -E
 397 AR              = $(CROSS_COMPILE)ar
 398 NM              = $(CROSS_COMPILE)nm
 399 STRIP           = $(CROSS_COMPILE)strip
 400 OBJCOPY         = $(CROSS_COMPILE)objcopy
 401 OBJDUMP         = $(CROSS_COMPILE)objdump
 402 LEX             = flex
 403 YACC            = bison
 404 AWK             = awk
 405 INSTALLKERNEL  := installkernel
 406 DEPMOD          = /sbin/depmod
 407 PERL            = perl
 408 PYTHON          = python
 409 PYTHON2         = python2
 410 PYTHON3         = python3
 411 CHECK           = sparse
 412
 413 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 414                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 415 NOSTDINC_FLAGS :=
 416 CFLAGS_MODULE   =
 417 AFLAGS_MODULE   =
 418 LDFLAGS_MODULE  =
 419 CFLAGS_KERNEL   =
 420 AFLAGS_KERNEL   =
 421 LDFLAGS_vmlinux =
 422
 423 # Use USERINCLUDE when you must reference the UAPI directories only.
 424 USERINCLUDE    := \
 425                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 426                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 427                 -I$(srctree)/include/uapi \
 428                 -I$(objtree)/include/generated/uapi \
 429                 -include $(srctree)/include/linux/kconfig.h
 430
 431 # Use LINUXINCLUDE when you must reference the include/ directory.
 432 # Needed to be compatible with the O= option
 433 LINUXINCLUDE    := \
 434                 -I$(srctree)/arch/$(SRCARCH)/include \
 435                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 436                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 437                 -I$(objtree)/include \
 438                 $(USERINCLUDE)
 439
 440 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 441 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 442                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 443                    -Werror=implicit-function-declaration -Werror=implicit-int \
 444                    -Wno-format-security \
 445                    -std=gnu89
 446 KBUILD_CPPFLAGS := -D__KERNEL__
 447 KBUILD_AFLAGS_KERNEL :=
 448 KBUILD_CFLAGS_KERNEL :=
 449 KBUILD_AFLAGS_MODULE  := -DMODULE
 450 KBUILD_CFLAGS_MODULE  := -DMODULE
 451 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 452 KBUILD_LDFLAGS :=
 453 GCC_PLUGINS_CFLAGS :=
 454
 455 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 456 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 457 export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 458 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 459
 460 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 461 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 462 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 463 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 464 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 465 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 466 export KBUILD_ARFLAGS
 467
 468 # When compiling out-of-tree modules, put MODVERDIR in the module
 469 # tree rather than in the kernel tree. The kernel tree might
 470 # even be read-only.
 471 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 472
 473 # Files to ignore in find ... statements
 474
 475 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 476                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 477                           -prune -o
 478 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 479                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 480
 481 # ===========================================================================
 482 # Rules shared between *config targets and build targets
 483
 484 # Basic helpers built in scripts/basic/
 485 PHONY += scripts_basic
 486 scripts_basic:
 487         $(Q)$(MAKE) $(build)=scripts/basic
 488         $(Q)rm -f .tmp_quiet_recordmcount
 489
 490 PHONY += outputmakefile
 491 # outputmakefile generates a Makefile in the output directory, if using a
 492 # separate output directory. This allows convenient use of make in the
 493 # output directory.
 494 # At the same time when output Makefile generated, generate .gitignore to
 495 # ignore whole output directory
 496 outputmakefile:
 497 ifneq ($(KBUILD_SRC),)
 498         $(Q)ln -fsn $(srctree) source
 499         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 500         $(Q){ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 501 endif
 502
 503 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 504 ifneq ($(CROSS_COMPILE),)
 505 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 506 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 507 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 508 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 509 endif
 510 ifneq ($(GCC_TOOLCHAIN),)
 511 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 512 endif
 513 CLANG_FLAGS     += -no-integrated-as
 514 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 515 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 516 export CLANG_FLAGS
 517 endif
 518
 519 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 520 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 521 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 522 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 523 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 524 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 525 export RETPOLINE_CFLAGS
 526 export RETPOLINE_VDSO_CFLAGS
 527
 528 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 529 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 530 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 531 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 532 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 533
 534 ifeq ($(config-targets),1)
 535 # ===========================================================================
 536 # *config targets only - make sure prerequisites are updated, and descend
 537 # in scripts/kconfig to make the *config target
 538
 539 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 540 # KBUILD_DEFCONFIG may point out an alternative default configuration
 541 # used for 'make defconfig'
 542 include arch/$(SRCARCH)/Makefile
 543 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 544
 545 config: scripts_basic outputmakefile FORCE
 546         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 547
 548 %config: scripts_basic outputmakefile FORCE
 549         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 550
 551 else
 552 # ===========================================================================
 553 # Build targets only - this includes vmlinux, arch specific targets, clean
 554 # targets and others. In general all targets except *config targets.
 555
 556 # If building an external module we do not care about the all: rule
 557 # but instead _all depend on modules
 558 PHONY += all
 559 ifeq ($(KBUILD_EXTMOD),)
 560 _all: all
 561 else
 562 _all: modules
 563 endif
 564
 565 # Decide whether to build built-in, modular, or both.
 566 # Normally, just do built-in.
 567
 568 KBUILD_MODULES :=
 569 KBUILD_BUILTIN := 1
 570
 571 # If we have only "make modules", don't compile built-in objects.
 572 # When we're building modules with modversions, we need to consider
 573 # the built-in objects during the descend as well, in order to
 574 # make sure the checksums are up to date before we record them.
 575
 576 ifeq ($(MAKECMDGOALS),modules)
 577   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 578 endif
 579
 580 # If we have "make <whatever> modules", compile modules
 581 # in addition to whatever we do anyway.
 582 # Just "make" or "make all" shall build modules as well
 583
 584 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 585   KBUILD_MODULES := 1
 586 endif
 587
 588 ifeq ($(MAKECMDGOALS),)
 589   KBUILD_MODULES := 1
 590 endif
 591
 592 export KBUILD_MODULES KBUILD_BUILTIN
 593
 594 ifeq ($(KBUILD_EXTMOD),)
 595 # Objects we will link into vmlinux / subdirs we need to visit
 596 init-y          := init/
 597 drivers-y       := drivers/ sound/
 598 net-y           := net/
 599 libs-y          := lib/
 600 core-y          := usr/
 601 virt-y          := virt/
 602 endif # KBUILD_EXTMOD
 603
 604 ifeq ($(dot-config),1)
 605 include include/config/auto.conf
 606 endif
 607
 608 # The all: target is the default when no target is given on the
 609 # command line.
 610 # This allow a user to issue only 'make' to build a kernel including modules
 611 # Defaults to vmlinux, but the arch makefile usually adds further targets
 612 all: vmlinux
 613
 614 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 615         $(call cc-option,-fno-tree-loop-im) \
 616         $(call cc-disable-warning,maybe-uninitialized,)
 617 export CFLAGS_GCOV
 618
 619 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 620 ifdef CONFIG_FUNCTION_TRACER
 621   CC_FLAGS_FTRACE := -pg
 622 endif
 623
 624 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 625 # values of the respective KBUILD_* variables
 626 ARCH_CPPFLAGS :=
 627 ARCH_AFLAGS :=
 628 ARCH_CFLAGS :=
 629 include arch/$(SRCARCH)/Makefile
 630
 631 ifeq ($(dot-config),1)
 632 ifeq ($(may-sync-config),1)
 633 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 634 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 635 # because some architectures define CROSS_COMPILE there.
 636 -include include/config/auto.conf.cmd
 637
 638 $(KCONFIG_CONFIG):
 639         @echo >&2 '***'
 640         @echo >&2 '*** Configuration file "$@" not found!'
 641         @echo >&2 '***'
 642         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 643         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 644         @echo >&2 '***'
 645         @/bin/false
 646
 647 # The actual configuration files used during the build are stored in
 648 # include/generated/ and include/config/. Update them if .config is newer than
 649 # include/config/auto.conf (which mirrors .config).
 650 #
 651 # This exploits the 'multi-target pattern rule' trick.
 652 # The syncconfig should be executed only once to make all the targets.
 653 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 654         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 655 else
 656 # External modules and some install targets need include/generated/autoconf.h
 657 # and include/config/auto.conf but do not care if they are up-to-date.
 658 # Use auto.conf to trigger the test
 659 PHONY += include/config/auto.conf
 660
 661 include/config/auto.conf:
 662         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 663         echo >&2;                                                       \
 664         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 665         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 666         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 667         echo >&2 ;                                                      \
 668         /bin/false)
 669
 670 endif # may-sync-config
 671 endif # $(dot-config)
 672
 673 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 674 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 675 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 676 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 677 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 678
 679 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 680 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 681 else
 682 KBUILD_CFLAGS   += -O2
 683 endif
 684
 685 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 686 KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 687 endif
 688
 689 # Tell gcc to never replace conditional load with a non-conditional one
 690 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 691
 692 include scripts/Makefile.kcov
 693 include scripts/Makefile.gcc-plugins
 694
 695 ifdef CONFIG_READABLE_ASM
 696 # Disable optimizations that make assembler listings hard to read.
 697 # reorder blocks reorders the control in the function
 698 # ipa clone creates specialized cloned functions
 699 # partial inlining inlines only parts of functions
 700 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 701                  $(call cc-option,-fno-ipa-cp-clone,) \
 702                  $(call cc-option,-fno-partial-inlining)
 703 endif
 704
 705 ifneq ($(CONFIG_FRAME_WARN),0)
 706 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 707 endif
 708
 709 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 710 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 711 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 712
 713 KBUILD_CFLAGS += $(stackp-flags-y)
 714
 715 ifdef CONFIG_CC_IS_CLANG
 716 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 717 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 718 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 719 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 720 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 721 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 722 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 723 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 724 # See modpost pattern 2
 725 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 726 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 727 else
 728
 729 # These warnings generated too much noise in a regular build.
 730 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 731 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 732 endif
 733
 734 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 735 ifdef CONFIG_FRAME_POINTER
 736 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 737 else
 738 # Some targets (ARM with Thumb2, for example), can't be built with frame
 739 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 740 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 741 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 742 # -fomit-frame-pointer with FUNCTION_TRACER.
 743 ifndef CONFIG_FUNCTION_TRACER
 744 KBUILD_CFLAGS   += -fomit-frame-pointer
 745 endif
 746 endif
 747
 748 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 749
 750 ifdef CONFIG_DEBUG_INFO
 751 ifdef CONFIG_DEBUG_INFO_SPLIT
 752 DEBUG_CFLAGS    += -gsplit-dwarf
 753 else
 754 DEBUG_CFLAGS    += -g
 755 endif
 756 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 757 endif
 758 ifdef CONFIG_DEBUG_INFO_DWARF4
 759 DEBUG_CFLAGS    += -gdwarf-4
 760 endif
 761
 762 ifdef CONFIG_DEBUG_INFO_REDUCED
 763 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 764                    $(call cc-option,-fno-var-tracking)
 765 endif
 766
 767 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 768 export DEBUG_CFLAGS
 769
 770 ifdef CONFIG_FUNCTION_TRACER
 771 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 772   # gcc 5 supports generating the mcount tables directly
 773   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 774     CC_FLAGS_FTRACE     += -mrecord-mcount
 775     export CC_USING_RECORD_MCOUNT := 1
 776   endif
 777   ifdef CONFIG_HAVE_NOP_MCOUNT
 778     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 779       CC_FLAGS_FTRACE   += -mnop-mcount
 780       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 781     endif
 782   endif
 783 endif
 784 ifdef CONFIG_HAVE_FENTRY
 785   ifeq ($(call cc-option-yn, -mfentry),y)
 786     CC_FLAGS_FTRACE     += -mfentry
 787     CC_FLAGS_USING      += -DCC_USING_FENTRY
 788   endif
 789 endif
 790 export CC_FLAGS_FTRACE
 791 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 792 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 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_KERNEL += -ffunction-sections -fdata-sections
 808 LDFLAGS_vmlinux += --gc-sections
 809 endif
 810
 811 # arch Makefile may override CC so keep this after arch Makefile is included
 812 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 813
 814 # warn about C99 declaration after statement
 815 KBUILD_CFLAGS += -Wdeclaration-after-statement
 816
 817 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 818 KBUILD_CFLAGS += $(call cc-option,-Wvla)
 819
 820 # disable pointer signed / unsigned warnings in gcc 4.0
 821 KBUILD_CFLAGS += -Wno-pointer-sign
 822
 823 # disable stringop warnings in gcc 8+
 824 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 825
 826 # disable invalid "can't wrap" optimizations for signed / pointers
 827 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 828
 829 # clang sets -fmerge-all-constants by default as optimization, but this
 830 # is non-conforming behavior for C and in fact breaks the kernel, so we
 831 # need to disable it here generally.
 832 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 833
 834 # for gcc -fno-merge-all-constants disables everything, but it is fine
 835 # to have actual conforming behavior enabled.
 836 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 837
 838 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 839 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 840
 841 # conserve stack if available
 842 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 843
 844 # Prohibit date/time macros, which would make the build non-deterministic
 845 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 846
 847 # enforce correct pointer usage
 848 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 849
 850 # Require designated initializers for all marked structures
 851 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 852
 853 # change __FILE__ to the relative path from the srctree
 854 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 855
 856 # use the deterministic mode of AR if available
 857 KBUILD_ARFLAGS := $(call ar-option,D)
 858
 859 include scripts/Makefile.kasan
 860 include scripts/Makefile.extrawarn
 861 include scripts/Makefile.ubsan
 862
 863 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 864 # last assignments
 865 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 866 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 867 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 868
 869 # Use --build-id when available.
 870 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 871 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 872 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 873
 874 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 875 LDFLAGS_vmlinux += $(call ld-option, -X,)
 876 endif
 877
 878 # insure the checker run with the right endianness
 879 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 880
 881 # the checker needs the correct machine size
 882 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 883
 884 # Default kernel image to build when no specific target is given.
 885 # KBUILD_IMAGE may be overruled on the command line or
 886 # set in the environment
 887 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 888 # this default value
 889 export KBUILD_IMAGE ?= vmlinux
 890
 891 #
 892 # INSTALL_PATH specifies where to place the updated kernel and system map
 893 # images. Default is /boot, but you can set it to other values
 894 export  INSTALL_PATH ?= /boot
 895
 896 #
 897 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 898 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 899 # an argument if needed. Otherwise it defaults to the kernel install path
 900 #
 901 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 902
 903 #
 904 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 905 # relocations required by build roots.  This is not defined in the
 906 # makefile but the argument can be passed to make if needed.
 907 #
 908
 909 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 910 export MODLIB
 911
 912 #
 913 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 914 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 915 # the default option --strip-debug will be used.  Otherwise,
 916 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 917
 918 ifdef INSTALL_MOD_STRIP
 919 ifeq ($(INSTALL_MOD_STRIP),1)
 920 mod_strip_cmd = $(STRIP) --strip-debug
 921 else
 922 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 923 endif # INSTALL_MOD_STRIP=1
 924 else
 925 mod_strip_cmd = true
 926 endif # INSTALL_MOD_STRIP
 927 export mod_strip_cmd
 928
 929 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 930 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 931 # or CONFIG_MODULE_COMPRESS_XZ.
 932
 933 mod_compress_cmd = true
 934 ifdef CONFIG_MODULE_COMPRESS
 935   ifdef CONFIG_MODULE_COMPRESS_GZIP
 936     mod_compress_cmd = gzip -n -f
 937   endif # CONFIG_MODULE_COMPRESS_GZIP
 938   ifdef CONFIG_MODULE_COMPRESS_XZ
 939     mod_compress_cmd = xz -f
 940   endif # CONFIG_MODULE_COMPRESS_XZ
 941 endif # CONFIG_MODULE_COMPRESS
 942 export mod_compress_cmd
 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     SKIP_STACK_VALIDATION := 1
 960     export SKIP_STACK_VALIDATION
 961   endif
 962 endif
 963
 964 PHONY += prepare0
 965
 966 ifeq ($(KBUILD_EXTMOD),)
 967 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 968
 969 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 970                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 971                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 972
 973 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 974                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 975
 976 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 977 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 978 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 979 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 980 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 981 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 982 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 983
 984 # Externally visible symbols (used by link-vmlinux.sh)
 985 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
 986                               $(drivers-y) $(net-y) $(virt-y)
 987 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 988 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 989 export LDFLAGS_vmlinux
 990 # used by scripts/package/Makefile
 991 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 992
 993 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
 994
 995 # Recurse until adjust_autoksyms.sh is satisfied
 996 PHONY += autoksyms_recursive
 997 autoksyms_recursive: $(vmlinux-deps)
 998 ifdef CONFIG_TRIM_UNUSED_KSYMS
 999         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1000           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1001 endif
1002
1003 # For the kernel to actually contain only the needed exported symbols,
1004 # we have to build modules as well to determine what those symbols are.
1005 # (this can be evaluated only once include/config/auto.conf has been included)
1006 ifdef CONFIG_TRIM_UNUSED_KSYMS
1007   KBUILD_MODULES := 1
1008 endif
1009
1010 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1011
1012 $(autoksyms_h):
1013         $(Q)mkdir -p $(dir $@)
1014         $(Q)touch $@
1015
1016 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1017
1018 # Final link of vmlinux with optional arch pass after final link
1019 cmd_link-vmlinux =                                                 \
1020         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1021         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1022
1023 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1024         +$(call if_changed,link-vmlinux)
1025
1026 targets := vmlinux
1027
1028 # Build samples along the rest of the kernel. This needs headers_install.
1029 ifdef CONFIG_SAMPLES
1030 vmlinux-dirs += samples
1031 samples: headers_install
1032 endif
1033
1034 # The actual objects are generated when descending,
1035 # make sure no implicit rule kicks in
1036 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1037
1038 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1039 # Preset locale variables to speed up the build process. Limit locale
1040 # tweaks to this spot to avoid wrong language settings when running
1041 # make menuconfig etc.
1042 # Error messages still appears in the original language
1043
1044 PHONY += $(vmlinux-dirs)
1045 $(vmlinux-dirs): prepare
1046         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1047
1048 filechk_kernel.release = \
1049         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1050
1051 # Store (new) KERNELRELEASE string in include/config/kernel.release
1052 include/config/kernel.release: $(srctree)/Makefile FORCE
1053         $(call filechk,kernel.release)
1054
1055 # Additional helpers built in scripts/
1056 # Carefully list dependencies so we do not try to build scripts twice
1057 # in parallel
1058 PHONY += scripts
1059 scripts: scripts_basic scripts_dtc
1060         $(Q)$(MAKE) $(build)=$(@)
1061
1062 # Things we need to do before we recursively start building the kernel
1063 # or the modules are listed in "prepare".
1064 # A multi level approach is used. prepareN is processed before prepareN-1.
1065 # archprepare is used in arch Makefiles and when processed asm symlink,
1066 # version.h and scripts_basic is processed / created.
1067
1068 PHONY += prepare archprepare prepare1 prepare3
1069
1070 # prepare3 is used to check if we are building in a separate output directory,
1071 # and if so do:
1072 # 1) Check that make has not been executed in the kernel src $(srctree)
1073 prepare3: include/config/kernel.release
1074 ifneq ($(KBUILD_SRC),)
1075         @$(kecho) '  Using $(srctree) as source for kernel'
1076         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1077                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1078                 echo >&2 "  in the '$(srctree)' directory.";\
1079                 /bin/false; \
1080         fi;
1081 endif
1082
1083 prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
1084                                                 include/generated/utsrelease.h
1085         $(cmd_crmodverdir)
1086
1087 archprepare: archheaders archscripts prepare1 scripts
1088
1089 prepare0: archprepare
1090         $(Q)$(MAKE) $(build)=scripts/mod
1091         $(Q)$(MAKE) $(build)=.
1092
1093 # All the preparing..
1094 prepare: prepare0 prepare-objtool
1095
1096 # Support for using generic headers in asm-generic
1097 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1098
1099 PHONY += asm-generic uapi-asm-generic
1100 asm-generic: uapi-asm-generic
1101         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1102         generic=include/asm-generic
1103 uapi-asm-generic:
1104         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1105         generic=include/uapi/asm-generic
1106
1107 PHONY += prepare-objtool
1108 prepare-objtool: $(objtool_target)
1109 ifeq ($(SKIP_STACK_VALIDATION),1)
1110 ifdef CONFIG_UNWINDER_ORC
1111         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1112         @false
1113 else
1114         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1115 endif
1116 endif
1117
1118 # Generate some files
1119 # ---------------------------------------------------------------------------
1120
1121 # KERNELRELEASE can change from a few different places, meaning version.h
1122 # needs to be updated, so this check is forced on all builds
1123
1124 uts_len := 64
1125 define filechk_utsrelease.h
1126         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1127           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1128           exit 1;                                                         \
1129         fi;                                                               \
1130         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1131 endef
1132
1133 define filechk_version.h
1134         echo \#define LINUX_VERSION_CODE $(shell                         \
1135         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1136         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1137 endef
1138
1139 $(version_h): FORCE
1140         $(call filechk,version.h)
1141         $(Q)rm -f $(old_version_h)
1142
1143 include/generated/utsrelease.h: include/config/kernel.release FORCE
1144         $(call filechk,utsrelease.h)
1145
1146 PHONY += headerdep
1147 headerdep:
1148         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1149         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1150
1151 # ---------------------------------------------------------------------------
1152 # Kernel headers
1153
1154 #Default location for installed headers
1155 export INSTALL_HDR_PATH = $(objtree)/usr
1156
1157 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1158 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1159
1160 PHONY += archheaders archscripts
1161
1162 PHONY += __headers
1163 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1164         $(Q)$(MAKE) $(build)=scripts build_unifdef
1165
1166 PHONY += headers_install_all
1167 headers_install_all:
1168         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1169
1170 PHONY += headers_install
1171 headers_install: __headers
1172         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1173           $(error Headers not exportable for the $(SRCARCH) architecture))
1174         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1175         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1176
1177 PHONY += headers_check_all
1178 headers_check_all: headers_install_all
1179         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1180
1181 PHONY += headers_check
1182 headers_check: headers_install
1183         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1184         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1185
1186 ifdef CONFIG_HEADERS_CHECK
1187 all: headers_check
1188 endif
1189
1190 # ---------------------------------------------------------------------------
1191 # Kernel selftest
1192
1193 PHONY += kselftest
1194 kselftest:
1195         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1196
1197 PHONY += kselftest-clean
1198 kselftest-clean:
1199         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1200
1201 PHONY += kselftest-merge
1202 kselftest-merge:
1203         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1204         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1205                 -m $(objtree)/.config \
1206                 $(srctree)/tools/testing/selftests/*/config
1207         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1208
1209 # ---------------------------------------------------------------------------
1210 # Devicetree files
1211
1212 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1213 dtstree := arch/$(SRCARCH)/boot/dts
1214 endif
1215
1216 ifneq ($(dtstree),)
1217
1218 %.dtb: prepare3 scripts_dtc
1219         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1220
1221 PHONY += dtbs dtbs_install dt_binding_check
1222 dtbs dtbs_check: prepare3 scripts_dtc
1223         $(Q)$(MAKE) $(build)=$(dtstree)
1224
1225 dtbs_check: export CHECK_DTBS=1
1226 dtbs_check: dt_binding_check
1227
1228 dtbs_install:
1229         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1230
1231 ifdef CONFIG_OF_EARLY_FLATTREE
1232 all: dtbs
1233 endif
1234
1235 endif
1236
1237 PHONY += scripts_dtc
1238 scripts_dtc: scripts_basic
1239         $(Q)$(MAKE) $(build)=scripts/dtc
1240
1241 dt_binding_check: scripts_dtc
1242         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1243
1244 # ---------------------------------------------------------------------------
1245 # Modules
1246
1247 ifdef CONFIG_MODULES
1248
1249 # By default, build modules as well
1250
1251 all: modules
1252
1253 # Build modules
1254 #
1255 # A module can be listed more than once in obj-m resulting in
1256 # duplicate lines in modules.order files.  Those are removed
1257 # using awk while concatenating to the final file.
1258
1259 PHONY += modules
1260 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1261         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1262         @$(kecho) '  Building modules, stage 2.';
1263         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1264
1265 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1266         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1267
1268 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1269         $(Q)$(MAKE) $(modbuiltin)=$*
1270
1271
1272 # Target to prepare building external modules
1273 PHONY += modules_prepare
1274 modules_prepare: prepare
1275
1276 # Target to install modules
1277 PHONY += modules_install
1278 modules_install: _modinst_ _modinst_post
1279
1280 PHONY += _modinst_
1281 _modinst_:
1282         @rm -rf $(MODLIB)/kernel
1283         @rm -f $(MODLIB)/source
1284         @mkdir -p $(MODLIB)/kernel
1285         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1286         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1287                 rm -f $(MODLIB)/build ; \
1288                 ln -s $(CURDIR) $(MODLIB)/build ; \
1289         fi
1290         @cp -f $(objtree)/modules.order $(MODLIB)/
1291         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1292         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1293
1294 # This depmod is only for convenience to give the initial
1295 # boot a modules.dep even before / is mounted read-write.  However the
1296 # boot script depmod is the master version.
1297 PHONY += _modinst_post
1298 _modinst_post: _modinst_
1299         $(call cmd,depmod)
1300
1301 ifeq ($(CONFIG_MODULE_SIG), y)
1302 PHONY += modules_sign
1303 modules_sign:
1304         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1305 endif
1306
1307 else # CONFIG_MODULES
1308
1309 # Modules not configured
1310 # ---------------------------------------------------------------------------
1311
1312 PHONY += modules modules_install
1313 modules modules_install:
1314         @echo >&2
1315         @echo >&2 "The present kernel configuration has modules disabled."
1316         @echo >&2 "Type 'make config' and enable loadable module support."
1317         @echo >&2 "Then build a kernel with module support enabled."
1318         @echo >&2
1319         @exit 1
1320
1321 endif # CONFIG_MODULES
1322
1323 ###
1324 # Cleaning is done on three levels.
1325 # make clean     Delete most generated files
1326 #                Leave enough to build external modules
1327 # make mrproper  Delete the current configuration, and all generated files
1328 # make distclean Remove editor backup files, patch leftover files and the like
1329
1330 # Directories & files removed with 'make clean'
1331 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1332
1333 # Directories & files removed with 'make mrproper'
1334 MRPROPER_DIRS  += include/config usr/include include/generated          \
1335                   arch/*/include/generated .tmp_objdiff
1336 MRPROPER_FILES += .config .config.old .version \
1337                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1338                   signing_key.pem signing_key.priv signing_key.x509     \
1339                   x509.genkey extra_certificates signing_key.x509.keyid \
1340                   signing_key.x509.signer vmlinux-gdb.py
1341
1342 # clean - Delete most, but leave enough to build external modules
1343 #
1344 clean: rm-dirs  := $(CLEAN_DIRS)
1345 clean: rm-files := $(CLEAN_FILES)
1346 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1347
1348 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1349 $(clean-dirs):
1350         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1351
1352 vmlinuxclean:
1353         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1354         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1355
1356 clean: archclean vmlinuxclean
1357
1358 # mrproper - Delete all generated files, including .config
1359 #
1360 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1361 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1362 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1363
1364 PHONY += $(mrproper-dirs) mrproper
1365 $(mrproper-dirs):
1366         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1367
1368 mrproper: clean $(mrproper-dirs)
1369         $(call cmd,rmdirs)
1370         $(call cmd,rmfiles)
1371
1372 # distclean
1373 #
1374 PHONY += distclean
1375
1376 distclean: mrproper
1377         @find $(srctree) $(RCS_FIND_IGNORE) \
1378                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1379                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1380                 -o -name 'core' \) \
1381                 -type f -print | xargs rm -f
1382
1383
1384 # Packaging of the kernel to various formats
1385 # ---------------------------------------------------------------------------
1386 package-dir     := scripts/package
1387
1388 %src-pkg: FORCE
1389         $(Q)$(MAKE) $(build)=$(package-dir) $@
1390 %pkg: include/config/kernel.release FORCE
1391         $(Q)$(MAKE) $(build)=$(package-dir) $@
1392
1393
1394 # Brief documentation of the typical targets used
1395 # ---------------------------------------------------------------------------
1396
1397 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1398 boards := $(sort $(notdir $(boards)))
1399 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1400 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1401
1402 PHONY += help
1403 help:
1404         @echo  'Cleaning targets:'
1405         @echo  '  clean           - Remove most generated files but keep the config and'
1406         @echo  '                    enough build support to build external modules'
1407         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1408         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1409         @echo  ''
1410         @echo  'Configuration targets:'
1411         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1412         @echo  ''
1413         @echo  'Other generic targets:'
1414         @echo  '  all             - Build all targets marked with [*]'
1415         @echo  '* vmlinux         - Build the bare kernel'
1416         @echo  '* modules         - Build all modules'
1417         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1418         @echo  '  dir/            - Build all files in dir and below'
1419         @echo  '  dir/file.[ois]  - Build specified target only'
1420         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1421         @echo  '                    (requires compiler support for LLVM assembly generation)'
1422         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1423         @echo  '                    (requires a recent binutils and recent build (System.map))'
1424         @echo  '  dir/file.ko     - Build module including final link'
1425         @echo  '  modules_prepare - Set up for building external modules'
1426         @echo  '  tags/TAGS       - Generate tags file for editors'
1427         @echo  '  cscope          - Generate cscope index'
1428         @echo  '  gtags           - Generate GNU GLOBAL index'
1429         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1430         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1431         @echo  '  image_name      - Output the image name (use with make -s)'
1432         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1433          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1434          echo  ''
1435         @echo  'Static analysers:'
1436         @echo  '  checkstack      - Generate a list of stack hogs'
1437         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1438         @echo  '  versioncheck    - Sanity check on version.h usage'
1439         @echo  '  includecheck    - Check for duplicate included header files'
1440         @echo  '  export_report   - List the usages of all exported symbols'
1441         @echo  '  headers_check   - Sanity check on exported headers'
1442         @echo  '  headerdep       - Detect inclusion cycles in headers'
1443         @echo  '  coccicheck      - Check with Coccinelle'
1444         @echo  ''
1445         @echo  'Kernel selftest:'
1446         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1447         @echo  '                    Build, install, and boot kernel before'
1448         @echo  '                    running kselftest on it'
1449         @echo  '  kselftest-clean - Remove all generated kselftest files'
1450         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1451         @echo  '                    .config.'
1452         @echo  ''
1453         @$(if $(dtstree), \
1454                 echo 'Devicetree:'; \
1455                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1456                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1457                 echo '')
1458
1459         @echo 'Userspace tools targets:'
1460         @echo '  use "make tools/help"'
1461         @echo '  or  "cd tools; make help"'
1462         @echo  ''
1463         @echo  'Kernel packaging:'
1464         @$(MAKE) $(build)=$(package-dir) help
1465         @echo  ''
1466         @echo  'Documentation targets:'
1467         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1468         @echo  ''
1469         @echo  'Architecture specific targets ($(SRCARCH)):'
1470         @$(if $(archhelp),$(archhelp),\
1471                 echo '  No architecture specific help defined for $(SRCARCH)')
1472         @echo  ''
1473         @$(if $(boards), \
1474                 $(foreach b, $(boards), \
1475                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1476                 echo '')
1477         @$(if $(board-dirs), \
1478                 $(foreach b, $(board-dirs), \
1479                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1480                 printf "  %-16s - Show all of the above\\n" help-boards; \
1481                 echo '')
1482
1483         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1484         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1485         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1486         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1487         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1488         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1489         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1490         @echo  '                1: warnings which may be relevant and do not occur too often'
1491         @echo  '                2: warnings which occur quite often but may still be relevant'
1492         @echo  '                3: more obscure warnings, can most likely be ignored'
1493         @echo  '                Multiple levels can be combined with W=12 or W=123'
1494         @echo  ''
1495         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1496         @echo  'For further info see the ./README file'
1497
1498
1499 help-board-dirs := $(addprefix help-,$(board-dirs))
1500
1501 help-boards: $(help-board-dirs)
1502
1503 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1504
1505 $(help-board-dirs): help-%:
1506         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1507         @$(if $(boards-per-dir), \
1508                 $(foreach b, $(boards-per-dir), \
1509                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1510                 echo '')
1511
1512
1513 # Documentation targets
1514 # ---------------------------------------------------------------------------
1515 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1516                linkcheckdocs dochelp refcheckdocs
1517 PHONY += $(DOC_TARGETS)
1518 $(DOC_TARGETS): scripts_basic FORCE
1519         $(Q)$(MAKE) $(build)=Documentation $@
1520
1521 # Misc
1522 # ---------------------------------------------------------------------------
1523
1524 PHONY += scripts_gdb
1525 scripts_gdb: prepare
1526         $(Q)$(MAKE) $(build)=scripts/gdb
1527         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1528
1529 ifdef CONFIG_GDB_SCRIPTS
1530 all: scripts_gdb
1531 endif
1532
1533 else # KBUILD_EXTMOD
1534
1535 ###
1536 # External module support.
1537 # When building external modules the kernel used as basis is considered
1538 # read-only, and no consistency checks are made and the make
1539 # system is not used on the basis kernel. If updates are required
1540 # in the basis kernel ordinary make commands (without M=...) must
1541 # be used.
1542 #
1543 # The following are the only valid targets when building external
1544 # modules.
1545 # make M=dir clean     Delete all automatically generated files
1546 # make M=dir modules   Make all modules in specified dir
1547 # make M=dir           Same as 'make M=dir modules'
1548 # make M=dir modules_install
1549 #                      Install the modules built in the module directory
1550 #                      Assumes install directory is already created
1551
1552 # We are always building modules
1553 KBUILD_MODULES := 1
1554
1555 PHONY += $(objtree)/Module.symvers
1556 $(objtree)/Module.symvers:
1557         @test -e $(objtree)/Module.symvers || ( \
1558         echo; \
1559         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1560         echo "           is missing; modules will have no dependencies and modversions."; \
1561         echo )
1562
1563 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1564 PHONY += $(module-dirs) modules
1565 $(module-dirs): prepare $(objtree)/Module.symvers
1566         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1567
1568 modules: $(module-dirs)
1569         @$(kecho) '  Building modules, stage 2.';
1570         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1571
1572 PHONY += modules_install
1573 modules_install: _emodinst_ _emodinst_post
1574
1575 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1576 PHONY += _emodinst_
1577 _emodinst_:
1578         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1579         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1580
1581 PHONY += _emodinst_post
1582 _emodinst_post: _emodinst_
1583         $(call cmd,depmod)
1584
1585 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1586
1587 PHONY += $(clean-dirs) clean
1588 $(clean-dirs):
1589         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1590
1591 clean:  rm-dirs := $(MODVERDIR)
1592 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1593
1594 PHONY += help
1595 help:
1596         @echo  '  Building external modules.'
1597         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1598         @echo  ''
1599         @echo  '  modules         - default target, build the module(s)'
1600         @echo  '  modules_install - install the module'
1601         @echo  '  clean           - remove generated files in module directory only'
1602         @echo  ''
1603
1604 PHONY += prepare
1605 prepare:
1606         $(cmd_crmodverdir)
1607 endif # KBUILD_EXTMOD
1608
1609 clean: $(clean-dirs)
1610         $(call cmd,rmdirs)
1611         $(call cmd,rmfiles)
1612         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1613                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1614                 -o -name '*.ko.*' \
1615                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1616                 -o -name '*.dwo' -o -name '*.lst' \
1617                 -o -name '*.su'  \
1618                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1619                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1620                 -o -name '*.asn1.[ch]' \
1621                 -o -name '*.symtypes' -o -name 'modules.order' \
1622                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1623                 -o -name '*.c.[012]*.*' \
1624                 -o -name '*.ll' \
1625                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1626
1627 # Generate tags for editors
1628 # ---------------------------------------------------------------------------
1629 quiet_cmd_tags = GEN     $@
1630       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1631
1632 tags TAGS cscope gtags: FORCE
1633         $(call cmd,tags)
1634
1635 # Scripts to check various things for consistency
1636 # ---------------------------------------------------------------------------
1637
1638 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1639
1640 includecheck:
1641         find $(srctree)/* $(RCS_FIND_IGNORE) \
1642                 -name '*.[hcS]' -type f -print | sort \
1643                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1644
1645 versioncheck:
1646         find $(srctree)/* $(RCS_FIND_IGNORE) \
1647                 -name '*.[hcS]' -type f -print | sort \
1648                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1649
1650 coccicheck:
1651         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1652
1653 namespacecheck:
1654         $(PERL) $(srctree)/scripts/namespace.pl
1655
1656 export_report:
1657         $(PERL) $(srctree)/scripts/export_report.pl
1658
1659 PHONY += checkstack kernelrelease kernelversion image_name
1660
1661 # UML needs a little special treatment here.  It wants to use the host
1662 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1663 # else wants $(ARCH), including people doing cross-builds, which means
1664 # that $(SUBARCH) doesn't work here.
1665 ifeq ($(ARCH), um)
1666 CHECKSTACK_ARCH := $(SUBARCH)
1667 else
1668 CHECKSTACK_ARCH := $(ARCH)
1669 endif
1670 checkstack:
1671         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1672         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1673
1674 kernelrelease:
1675         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1676
1677 kernelversion:
1678         @echo $(KERNELVERSION)
1679
1680 image_name:
1681         @echo $(KBUILD_IMAGE)
1682
1683 # Clear a bunch of variables before executing the submake
1684
1685 ifeq ($(quiet),silent_)
1686 tools_silent=s
1687 endif
1688
1689 tools/: FORCE
1690         $(Q)mkdir -p $(objtree)/tools
1691         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1692
1693 tools/%: FORCE
1694         $(Q)mkdir -p $(objtree)/tools
1695         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1696
1697 # Single targets
1698 # ---------------------------------------------------------------------------
1699 # Single targets are compatible with:
1700 # - build with mixed source and output
1701 # - build with separate output dir 'make O=...'
1702 # - external modules
1703 #
1704 #  target-dir => where to store outputfile
1705 #  build-dir  => directory in kernel source tree to use
1706
1707 build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1708 build-dir = $(patsubst %/,%,$(dir $(build-target)))
1709
1710 %.i: prepare FORCE
1711         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1712 %.ll: prepare FORCE
1713         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1714 %.lst: prepare FORCE
1715         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1716 %.o: prepare FORCE
1717         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1718 %.s: prepare FORCE
1719         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1720 %.symtypes: prepare FORCE
1721         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1722 %.ko: %.o
1723         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1724
1725 # Modules
1726 PHONY += /
1727 /: ./
1728
1729 # Make sure the latest headers are built for Documentation
1730 Documentation/ samples/: headers_install
1731 %/: prepare FORCE
1732         $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)
1733
1734 # FIXME Should go into a make.lib or something
1735 # ===========================================================================
1736
1737 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1738       cmd_rmdirs = rm -rf $(rm-dirs)
1739
1740 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1741       cmd_rmfiles = rm -f $(rm-files)
1742
1743 # Run depmod only if we have System.map and depmod is executable
1744 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1745       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1746                    $(KERNELRELEASE)
1747
1748 # Create temporary dir for module support files
1749 # clean it up only when building all modules
1750 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1751                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1752
1753 # read saved command lines for existing targets
1754 existing-targets := $(wildcard $(sort $(targets)))
1755
1756 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1757
1758 endif   # ifeq ($(config-targets),1)
1759 endif   # ifeq ($(mixed-targets),1)
1760 endif   # sub-make-done
1761
1762 PHONY += FORCE
1763 FORCE:
1764
1765 # Declare the contents of the PHONY variable as phony.  We keep that
1766 # information in a variable so we can use it in if_changed and friends.
1767 .PHONY: $(PHONY)