Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 19
   4 SUBLEVEL = 169
   5 EXTRAVERSION =
   6 NAME = "People's Front"
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.a targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Use make M=dir to specify directory of external module to build
 180 # Old syntax make ... SUBDIRS=$PWD is still supported
 181 # Setting the environment variable KBUILD_EXTMOD take precedence
 182 ifdef SUBDIRS
 183   KBUILD_EXTMOD ?= $(SUBDIRS)
 184 endif
 185
 186 ifeq ("$(origin M)", "command line")
 187   KBUILD_EXTMOD := $(M)
 188 endif
 189
 190 ifeq ($(KBUILD_SRC),)
 191         # building in the source tree
 192         srctree := .
 193 else
 194         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 195                 # building in a subdirectory of the source tree
 196                 srctree := ..
 197         else
 198                 srctree := $(KBUILD_SRC)
 199         endif
 200 endif
 201
 202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 203
 204 objtree         := .
 205 src             := $(srctree)
 206 obj             := $(objtree)
 207
 208 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 209
 210 export srctree objtree VPATH
 211
 212 # To make sure we do not include .config for any of the *config targets
 213 # catch them early, and hand them over to scripts/kconfig/Makefile
 214 # It is allowed to specify more targets when calling make, including
 215 # mixing *config targets and build targets.
 216 # For example 'make oldconfig all'.
 217 # Detect when mixed targets is specified, and make a second invocation
 218 # of make so .config is not included in this case either (for *config).
 219
 220 version_h := include/generated/uapi/linux/version.h
 221 old_version_h := include/linux/version.h
 222
 223 clean-targets := %clean mrproper cleandocs
 224 no-dot-config-targets := $(clean-targets) \
 225                          cscope gtags TAGS tags help% %docs check% coccicheck \
 226                          $(version_h) headers_% archheaders archscripts \
 227                          %asm-generic kernelversion %src-pkg
 228 no-sync-config-targets := $(no-dot-config-targets) install %install \
 229                            kernelrelease
 230
 231 config-targets  := 0
 232 mixed-targets   := 0
 233 dot-config      := 1
 234 may-sync-config := 1
 235
 236 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 237         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 238                 dot-config := 0
 239         endif
 240 endif
 241
 242 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 243         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 244                 may-sync-config := 0
 245         endif
 246 endif
 247
 248 ifneq ($(KBUILD_EXTMOD),)
 249         may-sync-config := 0
 250 endif
 251
 252 ifeq ($(KBUILD_EXTMOD),)
 253         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 254                 config-targets := 1
 255                 ifneq ($(words $(MAKECMDGOALS)),1)
 256                         mixed-targets := 1
 257                 endif
 258         endif
 259 endif
 260
 261 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 262 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 263         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 264                 mixed-targets := 1
 265         endif
 266 endif
 267
 268 # install and modules_install need also be processed one by one
 269 ifneq ($(filter install,$(MAKECMDGOALS)),)
 270         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 271                 mixed-targets := 1
 272         endif
 273 endif
 274
 275 ifeq ($(mixed-targets),1)
 276 # ===========================================================================
 277 # We're called with mixed targets (*config and build targets).
 278 # Handle them one by one.
 279
 280 PHONY += $(MAKECMDGOALS) __build_one_by_one
 281
 282 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 283         @:
 284
 285 __build_one_by_one:
 286         $(Q)set -e; \
 287         for i in $(MAKECMDGOALS); do \
 288                 $(MAKE) -f $(srctree)/Makefile $$i; \
 289         done
 290
 291 else
 292
 293 # We need some generic definitions (do not try to remake the file).
 294 scripts/Kbuild.include: ;
 295 include scripts/Kbuild.include
 296
 297 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 298 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 299 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 300 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 301
 302 include scripts/subarch.include
 303
 304 # Cross compiling and selecting different set of gcc/bin-utils
 305 # ---------------------------------------------------------------------------
 306 #
 307 # When performing cross compilation for other architectures ARCH shall be set
 308 # to the target architecture. (See arch/* for the possibilities).
 309 # ARCH can be set during invocation of make:
 310 # make ARCH=ia64
 311 # Another way is to have ARCH set in the environment.
 312 # The default ARCH is the host where make is executed.
 313
 314 # CROSS_COMPILE specify the prefix used for all executables used
 315 # during compilation. Only gcc and related bin-utils executables
 316 # are prefixed with $(CROSS_COMPILE).
 317 # CROSS_COMPILE can be set on the command line
 318 # make CROSS_COMPILE=ia64-linux-
 319 # Alternatively CROSS_COMPILE can be set in the environment.
 320 # Default value for CROSS_COMPILE is not to prefix executables
 321 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 322 ARCH            ?= $(SUBARCH)
 323
 324 # Architecture as present in compile.h
 325 UTS_MACHINE     := $(ARCH)
 326 SRCARCH         := $(ARCH)
 327
 328 # Additional ARCH settings for x86
 329 ifeq ($(ARCH),i386)
 330         SRCARCH := x86
 331 endif
 332 ifeq ($(ARCH),x86_64)
 333         SRCARCH := x86
 334 endif
 335
 336 # Additional ARCH settings for sparc
 337 ifeq ($(ARCH),sparc32)
 338        SRCARCH := sparc
 339 endif
 340 ifeq ($(ARCH),sparc64)
 341        SRCARCH := sparc
 342 endif
 343
 344 # Additional ARCH settings for sh
 345 ifeq ($(ARCH),sh64)
 346        SRCARCH := sh
 347 endif
 348
 349 KCONFIG_CONFIG  ?= .config
 350 export KCONFIG_CONFIG
 351
 352 # SHELL used by kbuild
 353 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 354           else if [ -x /bin/bash ]; then echo /bin/bash; \
 355           else echo sh; fi ; fi)
 356
 357 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 358 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 359 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 360
 361 ifneq ($(LLVM),)
 362 HOSTCC  = clang
 363 HOSTCXX = clang++
 364 else
 365 HOSTCC  = gcc
 366 HOSTCXX = g++
 367 endif
 368 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 369                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 370                 $(HOSTCFLAGS)
 371 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 372 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 373 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 374
 375 # Make variables (CC, etc...)
 376 CPP             = $(CC) -E
 377 ifneq ($(LLVM),)
 378 CC              = clang
 379 LD              = ld.lld
 380 AR              = llvm-ar
 381 NM              = llvm-nm
 382 OBJCOPY         = llvm-objcopy
 383 OBJDUMP         = llvm-objdump
 384 READELF         = llvm-readelf
 385 OBJSIZE         = llvm-size
 386 STRIP           = llvm-strip
 387 else
 388 CC              = $(CROSS_COMPILE)gcc
 389 LD              = $(CROSS_COMPILE)ld
 390 AR              = $(CROSS_COMPILE)ar
 391 NM              = $(CROSS_COMPILE)nm
 392 OBJCOPY         = $(CROSS_COMPILE)objcopy
 393 OBJDUMP         = $(CROSS_COMPILE)objdump
 394 READELF         = $(CROSS_COMPILE)readelf
 395 OBJSIZE         = $(CROSS_COMPILE)size
 396 STRIP           = $(CROSS_COMPILE)strip
 397 endif
 398 LEX             = flex
 399 YACC            = bison
 400 AWK             = awk
 401 GENKSYMS        = scripts/genksyms/genksyms
 402 INSTALLKERNEL  := installkernel
 403 DEPMOD          = depmod
 404 PERL            = perl
 405 PYTHON          = python
 406 PYTHON2         = python2
 407 PYTHON3         = python3
 408 CHECK           = sparse
 409
 410 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 411                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 412 NOSTDINC_FLAGS  =
 413 CFLAGS_MODULE   =
 414 AFLAGS_MODULE   =
 415 LDFLAGS_MODULE  =
 416 CFLAGS_KERNEL   =
 417 AFLAGS_KERNEL   =
 418 LDFLAGS_vmlinux =
 419
 420 # Use USERINCLUDE when you must reference the UAPI directories only.
 421 USERINCLUDE    := \
 422                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 423                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 424                 -I$(srctree)/include/uapi \
 425                 -I$(objtree)/include/generated/uapi \
 426                 -include $(srctree)/include/linux/kconfig.h
 427
 428 # Use LINUXINCLUDE when you must reference the include/ directory.
 429 # Needed to be compatible with the O= option
 430 LINUXINCLUDE    := \
 431                 -I$(srctree)/arch/$(SRCARCH)/include \
 432                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 433                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 434                 -I$(objtree)/include \
 435                 $(USERINCLUDE)
 436
 437 KBUILD_AFLAGS   := -D__ASSEMBLY__
 438 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 439                    -fno-strict-aliasing -fno-common -fshort-wchar \
 440                    -Werror-implicit-function-declaration \
 441                    -Werror=return-type -Wno-format-security \
 442                    -std=gnu89
 443 KBUILD_CPPFLAGS := -D__KERNEL__
 444 KBUILD_AFLAGS_KERNEL :=
 445 KBUILD_CFLAGS_KERNEL :=
 446 KBUILD_AFLAGS_MODULE  := -DMODULE
 447 KBUILD_CFLAGS_MODULE  := -DMODULE
 448 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 449 KBUILD_LDFLAGS :=
 450 GCC_PLUGINS_CFLAGS :=
 451 CLANG_FLAGS :=
 452
 453 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
 454 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 455 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 456 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 457
 458 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 459 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 460 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 461 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 462 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 463 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 464 export KBUILD_ARFLAGS
 465
 466 # When compiling out-of-tree modules, put MODVERDIR in the module
 467 # tree rather than in the kernel tree. The kernel tree might
 468 # even be read-only.
 469 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 470
 471 # Files to ignore in find ... statements
 472
 473 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 474                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 475                           -prune -o
 476 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 477                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 478
 479 # ===========================================================================
 480 # Rules shared between *config targets and build targets
 481
 482 # Basic helpers built in scripts/basic/
 483 PHONY += scripts_basic
 484 scripts_basic:
 485         $(Q)$(MAKE) $(build)=scripts/basic
 486         $(Q)rm -f .tmp_quiet_recordmcount
 487
 488 # To avoid any implicit rule to kick in, define an empty command.
 489 scripts/basic/%: scripts_basic ;
 490
 491 PHONY += outputmakefile
 492 # outputmakefile generates a Makefile in the output directory, if using a
 493 # separate output directory. This allows convenient use of make in the
 494 # output directory.
 495 outputmakefile:
 496 ifneq ($(KBUILD_SRC),)
 497         $(Q)ln -fsn $(srctree) source
 498         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 499             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 500 endif
 501
 502 ifeq ($(cc-name),clang)
 503 ifneq ($(CROSS_COMPILE),)
 504 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 505 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 506 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
 507 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 508 endif
 509 ifneq ($(GCC_TOOLCHAIN),)
 510 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 511 endif
 512 ifneq ($(LLVM_IAS),1)
 513 CLANG_FLAGS     += -no-integrated-as
 514 endif
 515 CLANG_FLAGS     += -Werror=unknown-warning-option
 516 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 517 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 518 export CLANG_FLAGS
 519 endif
 520
 521 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 522 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 523 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 524 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 525 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 526 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 527 export RETPOLINE_CFLAGS
 528 export RETPOLINE_VDSO_CFLAGS
 529
 530 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 531 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 532
 533 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 534 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 535 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 536 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 537 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 538
 539 ifeq ($(config-targets),1)
 540 # ===========================================================================
 541 # *config targets only - make sure prerequisites are updated, and descend
 542 # in scripts/kconfig to make the *config target
 543
 544 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 545 # KBUILD_DEFCONFIG may point out an alternative default configuration
 546 # used for 'make defconfig'
 547 include arch/$(SRCARCH)/Makefile
 548 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 549
 550 config: scripts_basic outputmakefile FORCE
 551         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 552
 553 %config: scripts_basic outputmakefile FORCE
 554         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 555
 556 else
 557 # ===========================================================================
 558 # Build targets only - this includes vmlinux, arch specific targets, clean
 559 # targets and others. In general all targets except *config targets.
 560
 561 # If building an external module we do not care about the all: rule
 562 # but instead _all depend on modules
 563 PHONY += all
 564 ifeq ($(KBUILD_EXTMOD),)
 565 _all: all
 566 else
 567 _all: modules
 568 endif
 569
 570 # Decide whether to build built-in, modular, or both.
 571 # Normally, just do built-in.
 572
 573 KBUILD_MODULES :=
 574 KBUILD_BUILTIN := 1
 575
 576 # If we have only "make modules", don't compile built-in objects.
 577 ifeq ($(MAKECMDGOALS),modules)
 578   KBUILD_BUILTIN :=
 579 endif
 580
 581 # If we have "make <whatever> modules", compile modules
 582 # in addition to whatever we do anyway.
 583 # Just "make" or "make all" shall build modules as well
 584
 585 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 586   KBUILD_MODULES := 1
 587 endif
 588
 589 ifeq ($(MAKECMDGOALS),)
 590   KBUILD_MODULES := 1
 591 endif
 592
 593 export KBUILD_MODULES KBUILD_BUILTIN
 594
 595 ifeq ($(KBUILD_EXTMOD),)
 596 # Objects we will link into vmlinux / subdirs we need to visit
 597 init-y          := init/
 598 drivers-y       := drivers/ sound/ firmware/
 599 net-y           := net/
 600 libs-y          := lib/
 601 core-y          := usr/
 602 virt-y          := virt/
 603 endif # KBUILD_EXTMOD
 604
 605 ifeq ($(dot-config),1)
 606 include include/config/auto.conf
 607 endif
 608
 609 # The all: target is the default when no target is given on the
 610 # command line.
 611 # This allow a user to issue only 'make' to build a kernel including modules
 612 # Defaults to vmlinux, but the arch makefile usually adds further targets
 613 all: vmlinux
 614
 615 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 616         $(call cc-option,-fno-tree-loop-im) \
 617         $(call cc-disable-warning,maybe-uninitialized,)
 618 export CFLAGS_GCOV
 619
 620 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 621 ifdef CONFIG_FUNCTION_TRACER
 622   CC_FLAGS_FTRACE := -pg
 623 endif
 624
 625 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 626 # values of the respective KBUILD_* variables
 627 ARCH_CPPFLAGS :=
 628 ARCH_AFLAGS :=
 629 ARCH_CFLAGS :=
 630 include arch/$(SRCARCH)/Makefile
 631
 632 ifeq ($(dot-config),1)
 633 ifeq ($(may-sync-config),1)
 634 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 635 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 636 # because some architectures define CROSS_COMPILE there.
 637 include include/config/auto.conf.cmd
 638
 639 # To avoid any implicit rule to kick in, define an empty command
 640 $(KCONFIG_CONFIG): ;
 641
 642 # The actual configuration files used during the build are stored in
 643 # include/generated/ and include/config/. Update them if .config is newer than
 644 # include/config/auto.conf (which mirrors .config).
 645 #
 646 # This exploits the 'multi-target pattern rule' trick.
 647 # The syncconfig should be executed only once to make all the targets.
 648 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 649         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 650 else
 651 # External modules and some install targets need include/generated/autoconf.h
 652 # and include/config/auto.conf but do not care if they are up-to-date.
 653 # Use auto.conf to trigger the test
 654 PHONY += include/config/auto.conf
 655
 656 include/config/auto.conf:
 657         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 658         echo >&2;                                                       \
 659         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 660         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 661         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 662         echo >&2 ;                                                      \
 663         /bin/false)
 664
 665 endif # may-sync-config
 666 endif # $(dot-config)
 667
 668 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 669 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 670 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 671 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 672 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 673 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 674
 675 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 676 KBUILD_CFLAGS   += -Os
 677 else
 678 KBUILD_CFLAGS   += -O2
 679 endif
 680
 681 # Tell gcc to never replace conditional load with a non-conditional one
 682 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 683 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 684
 685 include scripts/Makefile.kcov
 686 include scripts/Makefile.gcc-plugins
 687
 688 ifdef CONFIG_READABLE_ASM
 689 # Disable optimizations that make assembler listings hard to read.
 690 # reorder blocks reorders the control in the function
 691 # ipa clone creates specialized cloned functions
 692 # partial inlining inlines only parts of functions
 693 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 694                  $(call cc-option,-fno-ipa-cp-clone,) \
 695                  $(call cc-option,-fno-partial-inlining)
 696 endif
 697
 698 ifneq ($(CONFIG_FRAME_WARN),0)
 699 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 700 endif
 701
 702 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 703 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 704 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 705
 706 KBUILD_CFLAGS += $(stackp-flags-y)
 707
 708 ifeq ($(cc-name),clang)
 709 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 710 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 711 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 712 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 713 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 714 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 715 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 716 # See modpost pattern 2
 717 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 718 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 719 else
 720
 721 # These warnings generated too much noise in a regular build.
 722 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 723 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 724 endif
 725
 726 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 727 ifdef CONFIG_FRAME_POINTER
 728 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 729 else
 730 # Some targets (ARM with Thumb2, for example), can't be built with frame
 731 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 732 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 733 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 734 # -fomit-frame-pointer with FUNCTION_TRACER.
 735 ifndef CONFIG_FUNCTION_TRACER
 736 KBUILD_CFLAGS   += -fomit-frame-pointer
 737 endif
 738 endif
 739
 740 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 741
 742 ifdef CONFIG_DEBUG_INFO
 743 ifdef CONFIG_DEBUG_INFO_SPLIT
 744 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 745 else
 746 KBUILD_CFLAGS   += -g
 747 endif
 748 ifneq ($(LLVM_IAS),1)
 749 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 750 endif
 751 endif
 752
 753 ifdef CONFIG_DEBUG_INFO_DWARF4
 754 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 755 endif
 756
 757 ifdef CONFIG_DEBUG_INFO_REDUCED
 758 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 759                    $(call cc-option,-fno-var-tracking)
 760 endif
 761
 762 ifdef CONFIG_FUNCTION_TRACER
 763 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 764   # gcc 5 supports generating the mcount tables directly
 765   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 766     CC_FLAGS_FTRACE     += -mrecord-mcount
 767     export CC_USING_RECORD_MCOUNT := 1
 768   endif
 769   ifdef CONFIG_HAVE_NOP_MCOUNT
 770     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 771       CC_FLAGS_FTRACE   += -mnop-mcount
 772       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 773     endif
 774   endif
 775 endif
 776 ifdef CONFIG_HAVE_FENTRY
 777   ifeq ($(call cc-option-yn, -mfentry),y)
 778     CC_FLAGS_FTRACE     += -mfentry
 779     CC_FLAGS_USING      += -DCC_USING_FENTRY
 780   endif
 781 endif
 782 export CC_FLAGS_FTRACE
 783 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 784 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 785 ifdef CONFIG_DYNAMIC_FTRACE
 786         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 787                 BUILD_C_RECORDMCOUNT := y
 788                 export BUILD_C_RECORDMCOUNT
 789         endif
 790 endif
 791 endif
 792
 793 # We trigger additional mismatches with less inlining
 794 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 795 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 796 endif
 797
 798 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 799 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 800 LDFLAGS_vmlinux += --gc-sections
 801 endif
 802
 803 # arch Makefile may override CC so keep this after arch Makefile is included
 804 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 805
 806 # warn about C99 declaration after statement
 807 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 808
 809 # disable pointer signed / unsigned warnings in gcc 4.0
 810 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 811
 812 # disable stringop warnings in gcc 8+
 813 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 814
 815 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 816 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 817 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 818 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 819
 820 # Another good warning that we'll want to enable eventually
 821 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 822
 823 # Enabled with W=2, disabled by default as noisy
 824 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 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 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 845 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 846
 847 # require functions to have arguments in prototypes, not empty 'int foo()'
 848 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 849
 850 # Prohibit date/time macros, which would make the build non-deterministic
 851 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 852
 853 # enforce correct pointer usage
 854 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 855
 856 # Require designated initializers for all marked structures
 857 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 858
 859 # change __FILE__ to the relative path from the srctree
 860 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 861
 862 # ensure -fcf-protection is disabled when using retpoline as it is
 863 # incompatible with -mindirect-branch=thunk-extern
 864 ifdef CONFIG_RETPOLINE
 865 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 866 endif
 867
 868 # use the deterministic mode of AR if available
 869 KBUILD_ARFLAGS := $(call ar-option,D)
 870
 871 include scripts/Makefile.kasan
 872 include scripts/Makefile.extrawarn
 873 include scripts/Makefile.ubsan
 874
 875 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 876 # last assignments
 877 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 878 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 879 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 880
 881 # Use --build-id when available.
 882 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 883 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 884 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 885
 886 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 887 LDFLAGS_vmlinux += $(call ld-option, -X,)
 888 endif
 889
 890 # insure the checker run with the right endianness
 891 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 892
 893 # the checker needs the correct machine size
 894 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 895
 896 # Default kernel image to build when no specific target is given.
 897 # KBUILD_IMAGE may be overruled on the command line or
 898 # set in the environment
 899 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 900 # this default value
 901 export KBUILD_IMAGE ?= vmlinux
 902
 903 #
 904 # INSTALL_PATH specifies where to place the updated kernel and system map
 905 # images. Default is /boot, but you can set it to other values
 906 export  INSTALL_PATH ?= /boot
 907
 908 #
 909 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 910 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 911 # an argument if needed. Otherwise it defaults to the kernel install path
 912 #
 913 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 914
 915 #
 916 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 917 # relocations required by build roots.  This is not defined in the
 918 # makefile but the argument can be passed to make if needed.
 919 #
 920
 921 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 922 export MODLIB
 923
 924 #
 925 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 926 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 927 # the default option --strip-debug will be used.  Otherwise,
 928 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 929
 930 ifdef INSTALL_MOD_STRIP
 931 ifeq ($(INSTALL_MOD_STRIP),1)
 932 mod_strip_cmd = $(STRIP) --strip-debug
 933 else
 934 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 935 endif # INSTALL_MOD_STRIP=1
 936 else
 937 mod_strip_cmd = true
 938 endif # INSTALL_MOD_STRIP
 939 export mod_strip_cmd
 940
 941 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 942 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 943 # or CONFIG_MODULE_COMPRESS_XZ.
 944
 945 mod_compress_cmd = true
 946 ifdef CONFIG_MODULE_COMPRESS
 947   ifdef CONFIG_MODULE_COMPRESS_GZIP
 948     mod_compress_cmd = gzip -n -f
 949   endif # CONFIG_MODULE_COMPRESS_GZIP
 950   ifdef CONFIG_MODULE_COMPRESS_XZ
 951     mod_compress_cmd = xz -f
 952   endif # CONFIG_MODULE_COMPRESS_XZ
 953 endif # CONFIG_MODULE_COMPRESS
 954 export mod_compress_cmd
 955
 956 # Select initial ramdisk compression format, default is gzip(1).
 957 # This shall be used by the dracut(8) tool while creating an initramfs image.
 958 #
 959 INITRD_COMPRESS-y                  := gzip
 960 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 961 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 962 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 963 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 964 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 965 # do not export INITRD_COMPRESS, since we didn't actually
 966 # choose a sane default compression above.
 967 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 968
 969 ifdef CONFIG_MODULE_SIG_ALL
 970 $(eval $(call config_filename,MODULE_SIG_KEY))
 971
 972 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 973 else
 974 mod_sign_cmd = true
 975 endif
 976 export mod_sign_cmd
 977
 978 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 979
 980 ifdef CONFIG_STACK_VALIDATION
 981   has_libelf := $(call try-run,\
 982                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 983   ifeq ($(has_libelf),1)
 984     objtool_target := tools/objtool FORCE
 985   else
 986     SKIP_STACK_VALIDATION := 1
 987     export SKIP_STACK_VALIDATION
 988   endif
 989 endif
 990
 991 PHONY += prepare0
 992
 993 ifeq ($(KBUILD_EXTMOD),)
 994 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 995
 996 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 997                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 998                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 999
1000 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
1001                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1002
1003 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1004 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1005 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1006 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1007 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1008 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1009 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1010
1011 # Externally visible symbols (used by link-vmlinux.sh)
1012 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1013 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1014 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1015 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1016 export LDFLAGS_vmlinux
1017 # used by scripts/package/Makefile
1018 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1019
1020 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1021
1022 # Recurse until adjust_autoksyms.sh is satisfied
1023 PHONY += autoksyms_recursive
1024 autoksyms_recursive: $(vmlinux-deps)
1025 ifdef CONFIG_TRIM_UNUSED_KSYMS
1026         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1027           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1028 endif
1029
1030 # For the kernel to actually contain only the needed exported symbols,
1031 # we have to build modules as well to determine what those symbols are.
1032 # (this can be evaluated only once include/config/auto.conf has been included)
1033 ifdef CONFIG_TRIM_UNUSED_KSYMS
1034   KBUILD_MODULES := 1
1035 endif
1036
1037 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1038
1039 $(autoksyms_h):
1040         $(Q)mkdir -p $(dir $@)
1041         $(Q)touch $@
1042
1043 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1044
1045 # Final link of vmlinux with optional arch pass after final link
1046 cmd_link-vmlinux =                                                 \
1047         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1048         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1049
1050 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1051 ifdef CONFIG_HEADERS_CHECK
1052         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1053 endif
1054 ifdef CONFIG_GDB_SCRIPTS
1055         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1056 endif
1057         +$(call if_changed,link-vmlinux)
1058
1059 # Build samples along the rest of the kernel. This needs headers_install.
1060 ifdef CONFIG_SAMPLES
1061 vmlinux-dirs += samples
1062 samples: headers_install
1063 endif
1064
1065 # The actual objects are generated when descending,
1066 # make sure no implicit rule kicks in
1067 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1068
1069 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1070 # Preset locale variables to speed up the build process. Limit locale
1071 # tweaks to this spot to avoid wrong language settings when running
1072 # make menuconfig etc.
1073 # Error messages still appears in the original language
1074
1075 PHONY += $(vmlinux-dirs)
1076 $(vmlinux-dirs): prepare scripts
1077         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1078
1079 define filechk_kernel.release
1080         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1081 endef
1082
1083 # Store (new) KERNELRELEASE string in include/config/kernel.release
1084 include/config/kernel.release: $(srctree)/Makefile FORCE
1085         $(call filechk,kernel.release)
1086
1087 # Additional helpers built in scripts/
1088 # Carefully list dependencies so we do not try to build scripts twice
1089 # in parallel
1090 PHONY += scripts
1091 scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h)
1092         $(Q)$(MAKE) $(build)=$(@)
1093
1094 # Things we need to do before we recursively start building the kernel
1095 # or the modules are listed in "prepare".
1096 # A multi level approach is used. prepareN is processed before prepareN-1.
1097 # archprepare is used in arch Makefiles and when processed asm symlink,
1098 # version.h and scripts_basic is processed / created.
1099
1100 PHONY += prepare archprepare prepare1 prepare2 prepare3
1101
1102 # prepare3 is used to check if we are building in a separate output directory,
1103 # and if so do:
1104 # 1) Check that make has not been executed in the kernel src $(srctree)
1105 prepare3: include/config/kernel.release
1106 ifneq ($(KBUILD_SRC),)
1107         @$(kecho) '  Using $(srctree) as source for kernel'
1108         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1109                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1110                 echo >&2 "  in the '$(srctree)' directory.";\
1111                 /bin/false; \
1112         fi;
1113 endif
1114
1115 # prepare2 creates a makefile if using a separate output directory.
1116 # From this point forward, .config has been reprocessed, so any rules
1117 # that need to depend on updated CONFIG_* values can be checked here.
1118 prepare2: prepare3 outputmakefile asm-generic
1119
1120 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1121         $(cmd_crmodverdir)
1122
1123 archprepare: archheaders archscripts prepare1 scripts_basic
1124
1125 prepare0: archprepare gcc-plugins
1126         $(Q)$(MAKE) $(build)=.
1127
1128 # All the preparing..
1129 prepare: prepare0 prepare-objtool
1130
1131 # Support for using generic headers in asm-generic
1132 PHONY += asm-generic uapi-asm-generic
1133 asm-generic: uapi-asm-generic
1134         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1135                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1136 uapi-asm-generic:
1137         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1138                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1139
1140 PHONY += prepare-objtool
1141 prepare-objtool: $(objtool_target)
1142 ifeq ($(SKIP_STACK_VALIDATION),1)
1143 ifdef CONFIG_UNWINDER_ORC
1144         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1145         @false
1146 else
1147         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1148 endif
1149 endif
1150
1151 # Generate some files
1152 # ---------------------------------------------------------------------------
1153
1154 # KERNELRELEASE can change from a few different places, meaning version.h
1155 # needs to be updated, so this check is forced on all builds
1156
1157 uts_len := 64
1158 define filechk_utsrelease.h
1159         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1160           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1161           exit 1;                                                         \
1162         fi;                                                               \
1163         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1164 endef
1165
1166 define filechk_version.h
1167         (echo \#define LINUX_VERSION_CODE $(shell                         \
1168         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1169         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1170 endef
1171
1172 $(version_h): FORCE
1173         $(call filechk,version.h)
1174         $(Q)rm -f $(old_version_h)
1175
1176 include/generated/utsrelease.h: include/config/kernel.release FORCE
1177         $(call filechk,utsrelease.h)
1178
1179 PHONY += headerdep
1180 headerdep:
1181         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1182         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1183
1184 # ---------------------------------------------------------------------------
1185 # Kernel headers
1186
1187 #Default location for installed headers
1188 export INSTALL_HDR_PATH = $(objtree)/usr
1189
1190 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1191 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1192
1193 PHONY += archheaders
1194 archheaders:
1195
1196 PHONY += archscripts
1197 archscripts:
1198
1199 PHONY += __headers
1200 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1201         $(Q)$(MAKE) $(build)=scripts build_unifdef
1202
1203 PHONY += headers_install_all
1204 headers_install_all:
1205         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1206
1207 PHONY += headers_install
1208 headers_install: __headers
1209         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1210           $(error Headers not exportable for the $(SRCARCH) architecture))
1211         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1212         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1213
1214 PHONY += headers_check_all
1215 headers_check_all: headers_install_all
1216         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1217
1218 PHONY += headers_check
1219 headers_check: headers_install
1220         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1221         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1222
1223 # ---------------------------------------------------------------------------
1224 # Kernel selftest
1225
1226 PHONY += kselftest
1227 kselftest:
1228         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1229
1230 PHONY += kselftest-clean
1231 kselftest-clean:
1232         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1233
1234 PHONY += kselftest-merge
1235 kselftest-merge:
1236         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1237         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1238                 -m $(objtree)/.config \
1239                 $(srctree)/tools/testing/selftests/*/config
1240         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1241
1242 # ---------------------------------------------------------------------------
1243 # Modules
1244
1245 ifdef CONFIG_MODULES
1246
1247 # By default, build modules as well
1248
1249 all: modules
1250
1251 # When we're building modules with modversions, we need to consider
1252 # the built-in objects during the descend as well, in order to
1253 # make sure the checksums are up to date before we record them.
1254 ifdef CONFIG_MODVERSIONS
1255   KBUILD_BUILTIN := 1
1256 endif
1257
1258 # Build modules
1259 #
1260 # A module can be listed more than once in obj-m resulting in
1261 # duplicate lines in modules.order files.  Those are removed
1262 # using awk while concatenating to the final file.
1263
1264 PHONY += modules
1265 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1266         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1267         @$(kecho) '  Building modules, stage 2.';
1268         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1269
1270 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1271         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1272
1273 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1274         $(Q)$(MAKE) $(modbuiltin)=$*
1275
1276
1277 # Target to prepare building external modules
1278 PHONY += modules_prepare
1279 modules_prepare: prepare scripts
1280
1281 # Target to install modules
1282 PHONY += modules_install
1283 modules_install: _modinst_ _modinst_post
1284
1285 PHONY += _modinst_
1286 _modinst_:
1287         @rm -rf $(MODLIB)/kernel
1288         @rm -f $(MODLIB)/source
1289         @mkdir -p $(MODLIB)/kernel
1290         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1291         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1292                 rm -f $(MODLIB)/build ; \
1293                 ln -s $(CURDIR) $(MODLIB)/build ; \
1294         fi
1295         @cp -f $(objtree)/modules.order $(MODLIB)/
1296         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1297         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1298
1299 # This depmod is only for convenience to give the initial
1300 # boot a modules.dep even before / is mounted read-write.  However the
1301 # boot script depmod is the master version.
1302 PHONY += _modinst_post
1303 _modinst_post: _modinst_
1304         $(call cmd,depmod)
1305
1306 ifeq ($(CONFIG_MODULE_SIG), y)
1307 PHONY += modules_sign
1308 modules_sign:
1309         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1310 endif
1311
1312 else # CONFIG_MODULES
1313
1314 # Modules not configured
1315 # ---------------------------------------------------------------------------
1316
1317 PHONY += modules modules_install
1318 modules modules_install:
1319         @echo >&2
1320         @echo >&2 "The present kernel configuration has modules disabled."
1321         @echo >&2 "Type 'make config' and enable loadable module support."
1322         @echo >&2 "Then build a kernel with module support enabled."
1323         @echo >&2
1324         @exit 1
1325
1326 endif # CONFIG_MODULES
1327
1328 ###
1329 # Cleaning is done on three levels.
1330 # make clean     Delete most generated files
1331 #                Leave enough to build external modules
1332 # make mrproper  Delete the current configuration, and all generated files
1333 # make distclean Remove editor backup files, patch leftover files and the like
1334
1335 # Directories & files removed with 'make clean'
1336 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1337
1338 # Directories & files removed with 'make mrproper'
1339 MRPROPER_DIRS  += include/config usr/include include/generated          \
1340                   arch/*/include/generated .tmp_objdiff
1341 MRPROPER_FILES += .config .config.old .version \
1342                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1343                   signing_key.pem signing_key.priv signing_key.x509     \
1344                   x509.genkey extra_certificates signing_key.x509.keyid \
1345                   signing_key.x509.signer vmlinux-gdb.py
1346
1347 # clean - Delete most, but leave enough to build external modules
1348 #
1349 clean: rm-dirs  := $(CLEAN_DIRS)
1350 clean: rm-files := $(CLEAN_FILES)
1351 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1352
1353 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1354 $(clean-dirs):
1355         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1356
1357 vmlinuxclean:
1358         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1359         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1360
1361 clean: archclean vmlinuxclean
1362
1363 # mrproper - Delete all generated files, including .config
1364 #
1365 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1366 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1367 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1368
1369 PHONY += $(mrproper-dirs) mrproper archmrproper
1370 $(mrproper-dirs):
1371         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1372
1373 mrproper: clean archmrproper $(mrproper-dirs)
1374         $(call cmd,rmdirs)
1375         $(call cmd,rmfiles)
1376
1377 # distclean
1378 #
1379 PHONY += distclean
1380
1381 distclean: mrproper
1382         @find $(srctree) $(RCS_FIND_IGNORE) \
1383                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1384                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1385                 -o -name 'core' \) \
1386                 -type f -print | xargs rm -f
1387
1388
1389 # Packaging of the kernel to various formats
1390 # ---------------------------------------------------------------------------
1391 package-dir     := scripts/package
1392
1393 %src-pkg: FORCE
1394         $(Q)$(MAKE) $(build)=$(package-dir) $@
1395 %pkg: include/config/kernel.release FORCE
1396         $(Q)$(MAKE) $(build)=$(package-dir) $@
1397
1398
1399 # Brief documentation of the typical targets used
1400 # ---------------------------------------------------------------------------
1401
1402 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1403 boards := $(sort $(notdir $(boards)))
1404 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1405 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1406
1407 PHONY += help
1408 help:
1409         @echo  'Cleaning targets:'
1410         @echo  '  clean           - Remove most generated files but keep the config and'
1411         @echo  '                    enough build support to build external modules'
1412         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1413         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1414         @echo  ''
1415         @echo  'Configuration targets:'
1416         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1417         @echo  ''
1418         @echo  'Other generic targets:'
1419         @echo  '  all             - Build all targets marked with [*]'
1420         @echo  '* vmlinux         - Build the bare kernel'
1421         @echo  '* modules         - Build all modules'
1422         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1423         @echo  '  dir/            - Build all files in dir and below'
1424         @echo  '  dir/file.[ois]  - Build specified target only'
1425         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1426         @echo  '                    (requires compiler support for LLVM assembly generation)'
1427         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1428         @echo  '                    (requires a recent binutils and recent build (System.map))'
1429         @echo  '  dir/file.ko     - Build module including final link'
1430         @echo  '  modules_prepare - Set up for building external modules'
1431         @echo  '  tags/TAGS       - Generate tags file for editors'
1432         @echo  '  cscope          - Generate cscope index'
1433         @echo  '  gtags           - Generate GNU GLOBAL index'
1434         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1435         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1436         @echo  '  image_name      - Output the image name (use with make -s)'
1437         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1438          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1439          echo  ''
1440         @echo  'Static analysers:'
1441         @echo  '  checkstack      - Generate a list of stack hogs'
1442         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1443         @echo  '  versioncheck    - Sanity check on version.h usage'
1444         @echo  '  includecheck    - Check for duplicate included header files'
1445         @echo  '  export_report   - List the usages of all exported symbols'
1446         @echo  '  headers_check   - Sanity check on exported headers'
1447         @echo  '  headerdep       - Detect inclusion cycles in headers'
1448         @echo  '  coccicheck      - Check with Coccinelle'
1449         @echo  ''
1450         @echo  'Kernel selftest:'
1451         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1452         @echo  '                    Build, install, and boot kernel before'
1453         @echo  '                    running kselftest on it'
1454         @echo  '  kselftest-clean - Remove all generated kselftest files'
1455         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1456         @echo  '                    .config.'
1457         @echo  ''
1458         @echo 'Userspace tools targets:'
1459         @echo '  use "make tools/help"'
1460         @echo '  or  "cd tools; make help"'
1461         @echo  ''
1462         @echo  'Kernel packaging:'
1463         @$(MAKE) $(build)=$(package-dir) help
1464         @echo  ''
1465         @echo  'Documentation targets:'
1466         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1467         @echo  ''
1468         @echo  'Architecture specific targets ($(SRCARCH)):'
1469         @$(if $(archhelp),$(archhelp),\
1470                 echo '  No architecture specific help defined for $(SRCARCH)')
1471         @echo  ''
1472         @$(if $(boards), \
1473                 $(foreach b, $(boards), \
1474                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1475                 echo '')
1476         @$(if $(board-dirs), \
1477                 $(foreach b, $(board-dirs), \
1478                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1479                 printf "  %-16s - Show all of the above\\n" help-boards; \
1480                 echo '')
1481
1482         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1483         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1484         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1485         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1486         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1487         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1488         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1489         @echo  '                1: warnings which may be relevant and do not occur too often'
1490         @echo  '                2: warnings which occur quite often but may still be relevant'
1491         @echo  '                3: more obscure warnings, can most likely be ignored'
1492         @echo  '                Multiple levels can be combined with W=12 or W=123'
1493         @echo  ''
1494         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1495         @echo  'For further info see the ./README file'
1496
1497
1498 help-board-dirs := $(addprefix help-,$(board-dirs))
1499
1500 help-boards: $(help-board-dirs)
1501
1502 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1503
1504 $(help-board-dirs): help-%:
1505         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1506         @$(if $(boards-per-dir), \
1507                 $(foreach b, $(boards-per-dir), \
1508                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1509                 echo '')
1510
1511
1512 # Documentation targets
1513 # ---------------------------------------------------------------------------
1514 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1515                linkcheckdocs dochelp refcheckdocs
1516 PHONY += $(DOC_TARGETS)
1517 $(DOC_TARGETS): scripts_basic FORCE
1518         $(Q)$(MAKE) $(build)=Documentation $@
1519
1520 else # KBUILD_EXTMOD
1521
1522 ###
1523 # External module support.
1524 # When building external modules the kernel used as basis is considered
1525 # read-only, and no consistency checks are made and the make
1526 # system is not used on the basis kernel. If updates are required
1527 # in the basis kernel ordinary make commands (without M=...) must
1528 # be used.
1529 #
1530 # The following are the only valid targets when building external
1531 # modules.
1532 # make M=dir clean     Delete all automatically generated files
1533 # make M=dir modules   Make all modules in specified dir
1534 # make M=dir           Same as 'make M=dir modules'
1535 # make M=dir modules_install
1536 #                      Install the modules built in the module directory
1537 #                      Assumes install directory is already created
1538
1539 # We are always building modules
1540 KBUILD_MODULES := 1
1541
1542 PHONY += $(objtree)/Module.symvers
1543 $(objtree)/Module.symvers:
1544         @test -e $(objtree)/Module.symvers || ( \
1545         echo; \
1546         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1547         echo "           is missing; modules will have no dependencies and modversions."; \
1548         echo )
1549
1550 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1551 PHONY += $(module-dirs) modules
1552 $(module-dirs): prepare $(objtree)/Module.symvers
1553         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1554
1555 modules: $(module-dirs)
1556         @$(kecho) '  Building modules, stage 2.';
1557         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1558
1559 PHONY += modules_install
1560 modules_install: _emodinst_ _emodinst_post
1561
1562 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1563 PHONY += _emodinst_
1564 _emodinst_:
1565         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1566         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1567
1568 PHONY += _emodinst_post
1569 _emodinst_post: _emodinst_
1570         $(call cmd,depmod)
1571
1572 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1573
1574 PHONY += $(clean-dirs) clean
1575 $(clean-dirs):
1576         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1577
1578 clean:  rm-dirs := $(MODVERDIR)
1579 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1580
1581 PHONY += help
1582 help:
1583         @echo  '  Building external modules.'
1584         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1585         @echo  ''
1586         @echo  '  modules         - default target, build the module(s)'
1587         @echo  '  modules_install - install the module'
1588         @echo  '  clean           - remove generated files in module directory only'
1589         @echo  ''
1590
1591 # Dummies...
1592 PHONY += prepare scripts
1593 prepare:
1594         $(cmd_crmodverdir)
1595 scripts: ;
1596 endif # KBUILD_EXTMOD
1597
1598 clean: $(clean-dirs)
1599         $(call cmd,rmdirs)
1600         $(call cmd,rmfiles)
1601         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1602                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1603                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1604                 -o -name '*.dwo' -o -name '*.lst' \
1605                 -o -name '*.su'  \
1606                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1607                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1608                 -o -name '*.asn1.[ch]' \
1609                 -o -name '*.symtypes' -o -name 'modules.order' \
1610                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1611                 -o -name '*.c.[012]*.*' \
1612                 -o -name '*.ll' \
1613                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1614
1615 # Generate tags for editors
1616 # ---------------------------------------------------------------------------
1617 quiet_cmd_tags = GEN     $@
1618       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1619
1620 tags TAGS cscope gtags: FORCE
1621         $(call cmd,tags)
1622
1623 # Scripts to check various things for consistency
1624 # ---------------------------------------------------------------------------
1625
1626 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1627
1628 includecheck:
1629         find $(srctree)/* $(RCS_FIND_IGNORE) \
1630                 -name '*.[hcS]' -type f -print | sort \
1631                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1632
1633 versioncheck:
1634         find $(srctree)/* $(RCS_FIND_IGNORE) \
1635                 -name '*.[hcS]' -type f -print | sort \
1636                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1637
1638 coccicheck:
1639         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1640
1641 namespacecheck:
1642         $(PERL) $(srctree)/scripts/namespace.pl
1643
1644 export_report:
1645         $(PERL) $(srctree)/scripts/export_report.pl
1646
1647 endif #ifeq ($(config-targets),1)
1648 endif #ifeq ($(mixed-targets),1)
1649
1650 PHONY += checkstack kernelrelease kernelversion image_name
1651
1652 # UML needs a little special treatment here.  It wants to use the host
1653 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1654 # else wants $(ARCH), including people doing cross-builds, which means
1655 # that $(SUBARCH) doesn't work here.
1656 ifeq ($(ARCH), um)
1657 CHECKSTACK_ARCH := $(SUBARCH)
1658 else
1659 CHECKSTACK_ARCH := $(ARCH)
1660 endif
1661 checkstack:
1662         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1663         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1664
1665 kernelrelease:
1666         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1667
1668 kernelversion:
1669         @echo $(KERNELVERSION)
1670
1671 image_name:
1672         @echo $(KBUILD_IMAGE)
1673
1674 # Clear a bunch of variables before executing the submake
1675 tools/: FORCE
1676         $(Q)mkdir -p $(objtree)/tools
1677         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1678
1679 tools/%: FORCE
1680         $(Q)mkdir -p $(objtree)/tools
1681         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1682
1683 # Single targets
1684 # ---------------------------------------------------------------------------
1685 # Single targets are compatible with:
1686 # - build with mixed source and output
1687 # - build with separate output dir 'make O=...'
1688 # - external modules
1689 #
1690 #  target-dir => where to store outputfile
1691 #  build-dir  => directory in kernel source tree to use
1692
1693 ifeq ($(KBUILD_EXTMOD),)
1694         build-dir  = $(patsubst %/,%,$(dir $@))
1695         target-dir = $(dir $@)
1696 else
1697         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1698         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1699         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1700 endif
1701
1702 %.s: %.c prepare scripts FORCE
1703         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1704 %.i: %.c prepare scripts FORCE
1705         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1706 %.o: %.c prepare scripts FORCE
1707         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1708 %.lst: %.c prepare scripts FORCE
1709         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1710 %.s: %.S prepare scripts FORCE
1711         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1712 %.o: %.S prepare scripts FORCE
1713         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1714 %.symtypes: %.c prepare scripts FORCE
1715         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1716 %.ll: %.c prepare scripts FORCE
1717         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1718
1719 # Modules
1720 /: prepare scripts FORCE
1721         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1722         $(build)=$(build-dir)
1723 # Make sure the latest headers are built for Documentation
1724 Documentation/ samples/: headers_install
1725 %/: prepare scripts FORCE
1726         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1727         $(build)=$(build-dir)
1728 %.ko: prepare scripts FORCE
1729         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1730         $(build)=$(build-dir) $(@:.ko=.o)
1731         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1732
1733 # FIXME Should go into a make.lib or something
1734 # ===========================================================================
1735
1736 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1737       cmd_rmdirs = rm -rf $(rm-dirs)
1738
1739 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1740       cmd_rmfiles = rm -f $(rm-files)
1741
1742 # Run depmod only if we have System.map and depmod is executable
1743 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1744       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1745                    $(KERNELRELEASE)
1746
1747 # Create temporary dir for module support files
1748 # clean it up only when building all modules
1749 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1750                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1751
1752 # read all saved command lines
1753
1754 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1755
1756 ifneq ($(cmd_files),)
1757   $(cmd_files): ;       # Do not try to update included dependency files
1758   include $(cmd_files)
1759 endif
1760
1761 endif   # skip-makefile
1762
1763 PHONY += FORCE
1764 FORCE:
1765
1766 # Declare the contents of the PHONY variable as phony.  We keep that
1767 # information in a variable so we can use it in if_changed and friends.
1768 .PHONY: $(PHONY)