Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 6
   3 PATCHLEVEL = 8
   4 SUBLEVEL = 0
   5 EXTRAVERSION =
   6 NAME = Hurr durr I'ma ninja sloth
   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 ifeq ($(filter undefine,$(.FEATURES)),)
  15 $(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
  16 endif
  17
  18 $(if $(filter __%, $(MAKECMDGOALS)), \
  19         $(error targets prefixed with '__' are only for internal use))
  20
  21 # That's our default target when none is given on the command line
  22 PHONY := __all
  23 __all:
  24
  25 # We are using a recursive build, so we need to do a little thinking
  26 # to get the ordering right.
  27 #
  28 # Most importantly: sub-Makefiles should only ever modify files in
  29 # their own directory. If in some directory we have a dependency on
  30 # a file in another dir (which doesn't happen often, but it's often
  31 # unavoidable when linking the built-in.a targets which finally
  32 # turn into vmlinux), we will call a sub make in that other dir, and
  33 # after that we are sure that everything which is in that other dir
  34 # is now up to date.
  35 #
  36 # The only cases where we need to modify files which have global
  37 # effects are thus separated out and done before the recursive
  38 # descending is started. They are now explicitly listed as the
  39 # prepare rule.
  40
  41 this-makefile := $(lastword $(MAKEFILE_LIST))
  42 export abs_srctree := $(realpath $(dir $(this-makefile)))
  43 export abs_objtree := $(CURDIR)
  44
  45 ifneq ($(sub_make_done),1)
  46
  47 # Do not use make's built-in rules and variables
  48 # (this increases performance and avoids hard-to-debug behaviour)
  49 MAKEFLAGS += -rR
  50
  51 # Avoid funny character set dependencies
  52 unexport LC_ALL
  53 LC_COLLATE=C
  54 LC_NUMERIC=C
  55 export LC_COLLATE LC_NUMERIC
  56
  57 # Avoid interference with shell env settings
  58 unexport GREP_OPTIONS
  59
  60 # Beautify output
  61 # ---------------------------------------------------------------------------
  62 #
  63 # Most of build commands in Kbuild start with "cmd_". You can optionally define
  64 # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
  65 # that command is printed by default.
  66 #
  67 # e.g.)
  68 #    quiet_cmd_depmod = DEPMOD  $(MODLIB)
  69 #          cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
  70 #
  71 # A simple variant is to prefix commands with $(Q) - that's useful
  72 # for commands that shall be hidden in non-verbose mode.
  73 #
  74 #    $(Q)$(MAKE) $(build)=scripts/basic
  75 #
  76 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
  77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
  78 #
  79 # To put more focus on warnings, be less verbose as default
  80 # Use 'make V=1' to see the full commands
  81
  82 ifeq ("$(origin V)", "command line")
  83   KBUILD_VERBOSE = $(V)
  84 endif
  85
  86 quiet = quiet_
  87 Q = @
  88
  89 ifneq ($(findstring 1, $(KBUILD_VERBOSE)),)
  90   quiet =
  91   Q =
  92 endif
  93
  94 # If the user is running make -s (silent mode), suppress echoing of
  95 # commands
  96 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
  97
  98 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
  99 short-opts := $(firstword -$(MAKEFLAGS))
 100 else
 101 short-opts := $(filter-out --%,$(MAKEFLAGS))
 102 endif
 103
 104 ifneq ($(findstring s,$(short-opts)),)
 105 quiet=silent_
 106 override KBUILD_VERBOSE :=
 107 endif
 108
 109 export quiet Q KBUILD_VERBOSE
 110
 111 # Call a source code checker (by default, "sparse") as part of the
 112 # C compilation.
 113 #
 114 # Use 'make C=1' to enable checking of only re-compiled files.
 115 # Use 'make C=2' to enable checking of *all* source files, regardless
 116 # of whether they are re-compiled or not.
 117 #
 118 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 119 # including where to get the "sparse" utility.
 120
 121 ifeq ("$(origin C)", "command line")
 122   KBUILD_CHECKSRC = $(C)
 123 endif
 124 ifndef KBUILD_CHECKSRC
 125   KBUILD_CHECKSRC = 0
 126 endif
 127
 128 export KBUILD_CHECKSRC
 129
 130 # Enable "clippy" (a linter) as part of the Rust compilation.
 131 #
 132 # Use 'make CLIPPY=1' to enable it.
 133 ifeq ("$(origin CLIPPY)", "command line")
 134   KBUILD_CLIPPY := $(CLIPPY)
 135 endif
 136
 137 export KBUILD_CLIPPY
 138
 139 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 140 # directory of external module to build. Setting M= takes precedence.
 141 ifeq ("$(origin M)", "command line")
 142   KBUILD_EXTMOD := $(M)
 143 endif
 144
 145 $(if $(word 2, $(KBUILD_EXTMOD)), \
 146         $(error building multiple external modules is not supported))
 147
 148 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
 149         $(error module directory path cannot contain '$x')))
 150
 151 # Remove trailing slashes
 152 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
 153 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
 154 endif
 155
 156 export KBUILD_EXTMOD
 157
 158 # backward compatibility
 159 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
 160
 161 ifeq ("$(origin W)", "command line")
 162   KBUILD_EXTRA_WARN := $(W)
 163 endif
 164
 165 export KBUILD_EXTRA_WARN
 166
 167 # Kbuild will save output files in the current working directory.
 168 # This does not need to match to the root of the kernel source tree.
 169 #
 170 # For example, you can do this:
 171 #
 172 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 173 #
 174 # If you want to save output files in a different location, there are
 175 # two syntaxes to specify it.
 176 #
 177 # 1) O=
 178 # Use "make O=dir/to/store/output/files/"
 179 #
 180 # 2) Set KBUILD_OUTPUT
 181 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 182 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 183 #
 184 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 185 # variable.
 186
 187 # Do we want to change the working directory?
 188 ifeq ("$(origin O)", "command line")
 189   KBUILD_OUTPUT := $(O)
 190 endif
 191
 192 ifneq ($(KBUILD_OUTPUT),)
 193 # $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
 194 $(shell mkdir -p "$(KBUILD_OUTPUT)")
 195 # $(realpath ...) resolves symlinks
 196 abs_objtree := $(realpath $(KBUILD_OUTPUT))
 197 $(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)"))
 198 endif # ifneq ($(KBUILD_OUTPUT),)
 199
 200 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 201 $(error source directory cannot contain spaces or colons)
 202 endif
 203
 204 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 205 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 206 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 207 need-sub-make := 1
 208 # Cancel implicit rules for this Makefile.
 209 $(this-makefile): ;
 210 endif
 211
 212 export sub_make_done := 1
 213
 214 endif # sub_make_done
 215
 216 ifeq ($(abs_objtree),$(CURDIR))
 217 # Suppress "Entering directory ..." if we are at the final work directory.
 218 no-print-directory := --no-print-directory
 219 else
 220 # Recursion to show "Entering directory ..."
 221 need-sub-make := 1
 222 endif
 223
 224 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
 225 # If --no-print-directory is unset, recurse once again to set it.
 226 # You may end up recursing into __sub-make twice. This is needed due to the
 227 # behavior change in GNU Make 4.4.1.
 228 need-sub-make := 1
 229 endif
 230
 231 ifeq ($(need-sub-make),1)
 232
 233 PHONY += $(MAKECMDGOALS) __sub-make
 234
 235 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 236         @:
 237
 238 # Invoke a second make in the output directory, passing relevant variables
 239 __sub-make:
 240         $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
 241         -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 242
 243 else # need-sub-make
 244
 245 # We process the rest of the Makefile if this is the final invocation of make
 246
 247 ifeq ($(abs_srctree),$(abs_objtree))
 248         # building in the source tree
 249         srctree := .
 250         building_out_of_srctree :=
 251 else
 252         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 253                 # building in a subdirectory of the source tree
 254                 srctree := ..
 255         else
 256                 srctree := $(abs_srctree)
 257         endif
 258         building_out_of_srctree := 1
 259 endif
 260
 261 ifneq ($(KBUILD_ABS_SRCTREE),)
 262 srctree := $(abs_srctree)
 263 endif
 264
 265 objtree         := .
 266 VPATH           := $(srctree)
 267
 268 export building_out_of_srctree srctree objtree VPATH
 269
 270 # To make sure we do not include .config for any of the *config targets
 271 # catch them early, and hand them over to scripts/kconfig/Makefile
 272 # It is allowed to specify more targets when calling make, including
 273 # mixing *config targets and build targets.
 274 # For example 'make oldconfig all'.
 275 # Detect when mixed targets is specified, and make a second invocation
 276 # of make so .config is not included in this case either (for *config).
 277
 278 version_h := include/generated/uapi/linux/version.h
 279
 280 clean-targets := %clean mrproper cleandocs
 281 no-dot-config-targets := $(clean-targets) \
 282                          cscope gtags TAGS tags help% %docs check% coccicheck \
 283                          $(version_h) headers headers_% archheaders archscripts \
 284                          %asm-generic kernelversion %src-pkg dt_binding_check \
 285                          outputmakefile rustavailable rustfmt rustfmtcheck
 286 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
 287                           image_name
 288 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
 289
 290 config-build    :=
 291 mixed-build     :=
 292 need-config     := 1
 293 may-sync-config := 1
 294 single-build    :=
 295
 296 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 297     ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 298                 need-config :=
 299     endif
 300 endif
 301
 302 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 303     ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 304                 may-sync-config :=
 305     endif
 306 endif
 307
 308 need-compiler := $(may-sync-config)
 309
 310 ifneq ($(KBUILD_EXTMOD),)
 311         may-sync-config :=
 312 endif
 313
 314 ifeq ($(KBUILD_EXTMOD),)
 315         ifneq ($(filter %config,$(MAKECMDGOALS)),)
 316                 config-build := 1
 317                 ifneq ($(words $(MAKECMDGOALS)),1)
 318                         mixed-build := 1
 319                 endif
 320         endif
 321 endif
 322
 323 # We cannot build single targets and the others at the same time
 324 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 325         single-build := 1
 326     ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 327                 mixed-build := 1
 328     endif
 329 endif
 330
 331 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 332 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 333         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 334                 mixed-build := 1
 335         endif
 336 endif
 337
 338 # install and modules_install need also be processed one by one
 339 ifneq ($(filter install,$(MAKECMDGOALS)),)
 340         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 341                 mixed-build := 1
 342         endif
 343 endif
 344
 345 ifdef mixed-build
 346 # ===========================================================================
 347 # We're called with mixed targets (*config and build targets).
 348 # Handle them one by one.
 349
 350 PHONY += $(MAKECMDGOALS) __build_one_by_one
 351
 352 $(MAKECMDGOALS): __build_one_by_one
 353         @:
 354
 355 __build_one_by_one:
 356         $(Q)set -e; \
 357         for i in $(MAKECMDGOALS); do \
 358                 $(MAKE) -f $(srctree)/Makefile $$i; \
 359         done
 360
 361 else # !mixed-build
 362
 363 include $(srctree)/scripts/Kbuild.include
 364
 365 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 366 KERNELRELEASE = $(call read-file, include/config/kernel.release)
 367 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 368 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 369
 370 include $(srctree)/scripts/subarch.include
 371
 372 # Cross compiling and selecting different set of gcc/bin-utils
 373 # ---------------------------------------------------------------------------
 374 #
 375 # When performing cross compilation for other architectures ARCH shall be set
 376 # to the target architecture. (See arch/* for the possibilities).
 377 # ARCH can be set during invocation of make:
 378 # make ARCH=arm64
 379 # Another way is to have ARCH set in the environment.
 380 # The default ARCH is the host where make is executed.
 381
 382 # CROSS_COMPILE specify the prefix used for all executables used
 383 # during compilation. Only gcc and related bin-utils executables
 384 # are prefixed with $(CROSS_COMPILE).
 385 # CROSS_COMPILE can be set on the command line
 386 # make CROSS_COMPILE=aarch64-linux-gnu-
 387 # Alternatively CROSS_COMPILE can be set in the environment.
 388 # Default value for CROSS_COMPILE is not to prefix executables
 389 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 390 ARCH            ?= $(SUBARCH)
 391
 392 # Architecture as present in compile.h
 393 UTS_MACHINE     := $(ARCH)
 394 SRCARCH         := $(ARCH)
 395
 396 # Additional ARCH settings for x86
 397 ifeq ($(ARCH),i386)
 398         SRCARCH := x86
 399 endif
 400 ifeq ($(ARCH),x86_64)
 401         SRCARCH := x86
 402 endif
 403
 404 # Additional ARCH settings for sparc
 405 ifeq ($(ARCH),sparc32)
 406        SRCARCH := sparc
 407 endif
 408 ifeq ($(ARCH),sparc64)
 409        SRCARCH := sparc
 410 endif
 411
 412 # Additional ARCH settings for parisc
 413 ifeq ($(ARCH),parisc64)
 414        SRCARCH := parisc
 415 endif
 416
 417 export cross_compiling :=
 418 ifneq ($(SRCARCH),$(SUBARCH))
 419 cross_compiling := 1
 420 endif
 421
 422 KCONFIG_CONFIG  ?= .config
 423 export KCONFIG_CONFIG
 424
 425 # SHELL used by kbuild
 426 CONFIG_SHELL := sh
 427
 428 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 429 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 430 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 431
 432 ifneq ($(LLVM),)
 433 ifneq ($(filter %/,$(LLVM)),)
 434 LLVM_PREFIX := $(LLVM)
 435 else ifneq ($(filter -%,$(LLVM)),)
 436 LLVM_SUFFIX := $(LLVM)
 437 endif
 438
 439 HOSTCC  = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 440 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
 441 else
 442 HOSTCC  = gcc
 443 HOSTCXX = g++
 444 endif
 445 HOSTRUSTC = rustc
 446 HOSTPKG_CONFIG  = pkg-config
 447
 448 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 449                          -O2 -fomit-frame-pointer -std=gnu11
 450 KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
 451 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
 452
 453 # These flags apply to all Rust code in the tree, including the kernel and
 454 # host programs.
 455 export rust_common_flags := --edition=2021 \
 456                             -Zbinary_dep_depinfo=y \
 457                             -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
 458                             -Dunreachable_pub -Dnon_ascii_idents \
 459                             -Wmissing_docs \
 460                             -Drustdoc::missing_crate_level_docs \
 461                             -Dclippy::correctness -Dclippy::style \
 462                             -Dclippy::suspicious -Dclippy::complexity \
 463                             -Dclippy::perf \
 464                             -Dclippy::let_unit_value -Dclippy::mut_mut \
 465                             -Dclippy::needless_bitwise_bool \
 466                             -Dclippy::needless_continue \
 467                             -Dclippy::no_mangle_with_rust_abi \
 468                             -Wclippy::dbg_macro
 469
 470 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
 471 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 472 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
 473                         -Zallow-features= $(HOSTRUSTFLAGS)
 474 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 475 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 476
 477 # Make variables (CC, etc...)
 478 CPP             = $(CC) -E
 479 ifneq ($(LLVM),)
 480 CC              = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 481 LD              = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
 482 AR              = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
 483 NM              = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
 484 OBJCOPY         = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
 485 OBJDUMP         = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
 486 READELF         = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
 487 STRIP           = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
 488 else
 489 CC              = $(CROSS_COMPILE)gcc
 490 LD              = $(CROSS_COMPILE)ld
 491 AR              = $(CROSS_COMPILE)ar
 492 NM              = $(CROSS_COMPILE)nm
 493 OBJCOPY         = $(CROSS_COMPILE)objcopy
 494 OBJDUMP         = $(CROSS_COMPILE)objdump
 495 READELF         = $(CROSS_COMPILE)readelf
 496 STRIP           = $(CROSS_COMPILE)strip
 497 endif
 498 RUSTC           = rustc
 499 RUSTDOC         = rustdoc
 500 RUSTFMT         = rustfmt
 501 CLIPPY_DRIVER   = clippy-driver
 502 BINDGEN         = bindgen
 503 CARGO           = cargo
 504 PAHOLE          = pahole
 505 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 506 LEX             = flex
 507 YACC            = bison
 508 AWK             = awk
 509 INSTALLKERNEL  := installkernel
 510 PERL            = perl
 511 PYTHON3         = python3
 512 CHECK           = sparse
 513 BASH            = bash
 514 KGZIP           = gzip
 515 KBZIP2          = bzip2
 516 KLZOP           = lzop
 517 LZMA            = lzma
 518 LZ4             = lz4c
 519 XZ              = xz
 520 ZSTD            = zstd
 521
 522 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 523                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 524 NOSTDINC_FLAGS :=
 525 CFLAGS_MODULE   =
 526 RUSTFLAGS_MODULE =
 527 AFLAGS_MODULE   =
 528 LDFLAGS_MODULE  =
 529 CFLAGS_KERNEL   =
 530 RUSTFLAGS_KERNEL =
 531 AFLAGS_KERNEL   =
 532 LDFLAGS_vmlinux =
 533
 534 # Use USERINCLUDE when you must reference the UAPI directories only.
 535 USERINCLUDE    := \
 536                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 537                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 538                 -I$(srctree)/include/uapi \
 539                 -I$(objtree)/include/generated/uapi \
 540                 -include $(srctree)/include/linux/compiler-version.h \
 541                 -include $(srctree)/include/linux/kconfig.h
 542
 543 # Use LINUXINCLUDE when you must reference the include/ directory.
 544 # Needed to be compatible with the O= option
 545 LINUXINCLUDE    := \
 546                 -I$(srctree)/arch/$(SRCARCH)/include \
 547                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 548                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 549                 -I$(objtree)/include \
 550                 $(USERINCLUDE)
 551
 552 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 553
 554 KBUILD_CFLAGS :=
 555 KBUILD_CFLAGS += -std=gnu11
 556 KBUILD_CFLAGS += -fshort-wchar
 557 KBUILD_CFLAGS += -funsigned-char
 558 KBUILD_CFLAGS += -fno-common
 559 KBUILD_CFLAGS += -fno-PIE
 560 KBUILD_CFLAGS += -fno-strict-aliasing
 561
 562 KBUILD_CPPFLAGS := -D__KERNEL__
 563 KBUILD_RUSTFLAGS := $(rust_common_flags) \
 564                     -Cpanic=abort -Cembed-bitcode=n -Clto=n \
 565                     -Cforce-unwind-tables=n -Ccodegen-units=1 \
 566                     -Csymbol-mangling-version=v0 \
 567                     -Crelocation-model=static \
 568                     -Zfunction-sections=n \
 569                     -Dclippy::float_arithmetic
 570
 571 KBUILD_AFLAGS_KERNEL :=
 572 KBUILD_CFLAGS_KERNEL :=
 573 KBUILD_RUSTFLAGS_KERNEL :=
 574 KBUILD_AFLAGS_MODULE  := -DMODULE
 575 KBUILD_CFLAGS_MODULE  := -DMODULE
 576 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
 577 KBUILD_LDFLAGS_MODULE :=
 578 KBUILD_LDFLAGS :=
 579 CLANG_FLAGS :=
 580
 581 ifeq ($(KBUILD_CLIPPY),1)
 582         RUSTC_OR_CLIPPY_QUIET := CLIPPY
 583         RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
 584 else
 585         RUSTC_OR_CLIPPY_QUIET := RUSTC
 586         RUSTC_OR_CLIPPY = $(RUSTC)
 587 endif
 588
 589 ifdef RUST_LIB_SRC
 590         export RUST_LIB_SRC
 591 endif
 592
 593 # Allows the usage of unstable features in stable compilers.
 594 export RUSTC_BOOTSTRAP := 1
 595
 596 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
 597 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
 598 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
 599 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 600 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 601 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 602 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 603 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
 604
 605 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 606 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 607 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
 608 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 609 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 610 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
 611
 612 # Files to ignore in find ... statements
 613
 614 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 615                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 616                           -prune -o
 617
 618 # ===========================================================================
 619 # Rules shared between *config targets and build targets
 620
 621 # Basic helpers built in scripts/basic/
 622 PHONY += scripts_basic
 623 scripts_basic:
 624         $(Q)$(MAKE) $(build)=scripts/basic
 625
 626 PHONY += outputmakefile
 627 ifdef building_out_of_srctree
 628 # Before starting out-of-tree build, make sure the source tree is clean.
 629 # outputmakefile generates a Makefile in the output directory, if using a
 630 # separate output directory. This allows convenient use of make in the
 631 # output directory.
 632 # At the same time when output Makefile generated, generate .gitignore to
 633 # ignore whole output directory
 634
 635 quiet_cmd_makefile = GEN     Makefile
 636       cmd_makefile = { \
 637         echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
 638         echo "include $(srctree)/Makefile"; \
 639         } > Makefile
 640
 641 outputmakefile:
 642         @if [ -f $(srctree)/.config -o \
 643                  -d $(srctree)/include/config -o \
 644                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 645                 echo >&2 "***"; \
 646                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 647                 echo >&2 "*** in $(abs_srctree)";\
 648                 echo >&2 "***"; \
 649                 false; \
 650         fi
 651         $(Q)ln -fsn $(srctree) source
 652         $(call cmd,makefile)
 653         $(Q)test -e .gitignore || \
 654         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 655 endif
 656
 657 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 658 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 659 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 660 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 661 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
 662
 663 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 664 include $(srctree)/scripts/Makefile.clang
 665 endif
 666
 667 # Include this also for config targets because some architectures need
 668 # cc-cross-prefix to determine CROSS_COMPILE.
 669 ifdef need-compiler
 670 include $(srctree)/scripts/Makefile.compiler
 671 endif
 672
 673 ifdef config-build
 674 # ===========================================================================
 675 # *config targets only - make sure prerequisites are updated, and descend
 676 # in scripts/kconfig to make the *config target
 677
 678 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
 679 # KBUILD_DEFCONFIG may point out an alternative default configuration
 680 # used for 'make defconfig'
 681 include $(srctree)/arch/$(SRCARCH)/Makefile
 682 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 683
 684 config: outputmakefile scripts_basic FORCE
 685         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 686
 687 %config: outputmakefile scripts_basic FORCE
 688         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 689
 690 else #!config-build
 691 # ===========================================================================
 692 # Build targets only - this includes vmlinux, arch-specific targets, clean
 693 # targets and others. In general all targets except *config targets.
 694
 695 # If building an external module we do not care about the all: rule
 696 # but instead __all depend on modules
 697 PHONY += all
 698 ifeq ($(KBUILD_EXTMOD),)
 699 __all: all
 700 else
 701 __all: modules
 702 endif
 703
 704 targets :=
 705
 706 # Decide whether to build built-in, modular, or both.
 707 # Normally, just do built-in.
 708
 709 KBUILD_MODULES :=
 710 KBUILD_BUILTIN := 1
 711
 712 # If we have only "make modules", don't compile built-in objects.
 713 ifeq ($(MAKECMDGOALS),modules)
 714   KBUILD_BUILTIN :=
 715 endif
 716
 717 # If we have "make <whatever> modules", compile modules
 718 # in addition to whatever we do anyway.
 719 # Just "make" or "make all" shall build modules as well
 720
 721 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
 722   KBUILD_MODULES := 1
 723 endif
 724
 725 ifeq ($(MAKECMDGOALS),)
 726   KBUILD_MODULES := 1
 727 endif
 728
 729 export KBUILD_MODULES KBUILD_BUILTIN
 730
 731 ifdef need-config
 732 include include/config/auto.conf
 733 endif
 734
 735 ifeq ($(KBUILD_EXTMOD),)
 736 # Objects we will link into vmlinux / subdirs we need to visit
 737 core-y          :=
 738 drivers-y       :=
 739 libs-y          := lib/
 740 endif # KBUILD_EXTMOD
 741
 742 # The all: target is the default when no target is given on the
 743 # command line.
 744 # This allow a user to issue only 'make' to build a kernel including modules
 745 # Defaults to vmlinux, but the arch makefile usually adds further targets
 746 all: vmlinux
 747
 748 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage
 749 ifdef CONFIG_CC_IS_GCC
 750 CFLAGS_GCOV     += -fno-tree-loop-im
 751 endif
 752 export CFLAGS_GCOV
 753
 754 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 755 ifdef CONFIG_FUNCTION_TRACER
 756   CC_FLAGS_FTRACE := -pg
 757 endif
 758
 759 include $(srctree)/arch/$(SRCARCH)/Makefile
 760
 761 ifdef need-config
 762 ifdef may-sync-config
 763 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 764 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 765 # because some architectures define CROSS_COMPILE there.
 766 include include/config/auto.conf.cmd
 767
 768 $(KCONFIG_CONFIG):
 769         @echo >&2 '***'
 770         @echo >&2 '*** Configuration file "$@" not found!'
 771         @echo >&2 '***'
 772         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 773         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 774         @echo >&2 '***'
 775         @/bin/false
 776
 777 # The actual configuration files used during the build are stored in
 778 # include/generated/ and include/config/. Update them if .config is newer than
 779 # include/config/auto.conf (which mirrors .config).
 780 #
 781 # This exploits the 'multi-target pattern rule' trick.
 782 # The syncconfig should be executed only once to make all the targets.
 783 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 784 #
 785 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
 786 # so you cannot notice that Kconfig is waiting for the user input.
 787 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
 788         $(Q)$(kecho) "  SYNC    $@"
 789         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 790 else # !may-sync-config
 791 # External modules and some install targets need include/generated/autoconf.h
 792 # and include/config/auto.conf but do not care if they are up-to-date.
 793 # Use auto.conf to trigger the test
 794 PHONY += include/config/auto.conf
 795
 796 include/config/auto.conf:
 797         @test -e include/generated/autoconf.h -a -e $@ || (             \
 798         echo >&2;                                                       \
 799         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 800         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 801         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 802         echo >&2 ;                                                      \
 803         /bin/false)
 804
 805 endif # may-sync-config
 806 endif # need-config
 807
 808 KBUILD_CFLAGS   += -fno-delete-null-pointer-checks
 809
 810 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 811 KBUILD_CFLAGS += -O2
 812 KBUILD_RUSTFLAGS += -Copt-level=2
 813 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 814 KBUILD_CFLAGS += -Os
 815 KBUILD_RUSTFLAGS += -Copt-level=s
 816 endif
 817
 818 # Always set `debug-assertions` and `overflow-checks` because their default
 819 # depends on `opt-level` and `debug-assertions`, respectively.
 820 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
 821 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
 822
 823 # Tell gcc to never replace conditional load with a non-conditional one
 824 ifdef CONFIG_CC_IS_GCC
 825 # gcc-10 renamed --param=allow-store-data-races=0 to
 826 # -fno-allow-store-data-races.
 827 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 828 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 829 endif
 830
 831 ifdef CONFIG_READABLE_ASM
 832 # Disable optimizations that make assembler listings hard to read.
 833 # reorder blocks reorders the control in the function
 834 # ipa clone creates specialized cloned functions
 835 # partial inlining inlines only parts of functions
 836 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
 837 endif
 838
 839 stackp-flags-y                                    := -fno-stack-protector
 840 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 841 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 842
 843 KBUILD_CFLAGS += $(stackp-flags-y)
 844
 845 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
 846 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
 847
 848 ifdef CONFIG_FRAME_POINTER
 849 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 850 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
 851 else
 852 # Some targets (ARM with Thumb2, for example), can't be built with frame
 853 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 854 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 855 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 856 # -fomit-frame-pointer with FUNCTION_TRACER.
 857 # In the Rust target specification, "frame-pointer" is set explicitly
 858 # to "may-omit".
 859 ifndef CONFIG_FUNCTION_TRACER
 860 KBUILD_CFLAGS   += -fomit-frame-pointer
 861 endif
 862 endif
 863
 864 # Initialize all stack variables with a 0xAA pattern.
 865 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 866 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 867 endif
 868
 869 # Initialize all stack variables with a zero value.
 870 ifdef CONFIG_INIT_STACK_ALL_ZERO
 871 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 872 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
 873 # https://github.com/llvm/llvm-project/issues/44842
 874 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 875 export CC_AUTO_VAR_INIT_ZERO_ENABLER
 876 KBUILD_CFLAGS   += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
 877 endif
 878 endif
 879
 880 # While VLAs have been removed, GCC produces unreachable stack probes
 881 # for the randomize_kstack_offset feature. Disable it for all compilers.
 882 KBUILD_CFLAGS   += $(call cc-option, -fno-stack-clash-protection)
 883
 884 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
 885 ifdef CONFIG_ZERO_CALL_USED_REGS
 886 KBUILD_CFLAGS   += -fzero-call-used-regs=used-gpr
 887 endif
 888
 889 ifdef CONFIG_FUNCTION_TRACER
 890 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 891   CC_FLAGS_FTRACE       += -mrecord-mcount
 892   ifdef CONFIG_HAVE_NOP_MCOUNT
 893     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 894       CC_FLAGS_FTRACE   += -mnop-mcount
 895       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 896     endif
 897   endif
 898 endif
 899 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 900   ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
 901     CC_FLAGS_USING      += -DCC_USING_NOP_MCOUNT
 902   endif
 903 endif
 904 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 905   ifdef CONFIG_HAVE_C_RECORDMCOUNT
 906     BUILD_C_RECORDMCOUNT := y
 907     export BUILD_C_RECORDMCOUNT
 908   endif
 909 endif
 910 ifdef CONFIG_HAVE_FENTRY
 911   # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
 912   ifeq ($(call cc-option-yn, -mfentry),y)
 913     CC_FLAGS_FTRACE     += -mfentry
 914     CC_FLAGS_USING      += -DCC_USING_FENTRY
 915   endif
 916 endif
 917 export CC_FLAGS_FTRACE
 918 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 919 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 920 endif
 921
 922 # We trigger additional mismatches with less inlining
 923 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 924 KBUILD_CFLAGS += -fno-inline-functions-called-once
 925 endif
 926
 927 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
 928 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 929 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 930 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
 931 LDFLAGS_vmlinux += --gc-sections
 932 endif
 933
 934 ifdef CONFIG_SHADOW_CALL_STACK
 935 ifndef CONFIG_DYNAMIC_SCS
 936 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 937 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 938 endif
 939 export CC_FLAGS_SCS
 940 endif
 941
 942 ifdef CONFIG_LTO_CLANG
 943 ifdef CONFIG_LTO_CLANG_THIN
 944 CC_FLAGS_LTO    := -flto=thin -fsplit-lto-unit
 945 KBUILD_LDFLAGS  += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
 946 else
 947 CC_FLAGS_LTO    := -flto
 948 endif
 949 CC_FLAGS_LTO    += -fvisibility=hidden
 950
 951 # Limit inlining across translation units to reduce binary size
 952 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
 953 endif
 954
 955 ifdef CONFIG_LTO
 956 KBUILD_CFLAGS   += -fno-lto $(CC_FLAGS_LTO)
 957 KBUILD_AFLAGS   += -fno-lto
 958 export CC_FLAGS_LTO
 959 endif
 960
 961 ifdef CONFIG_CFI_CLANG
 962 CC_FLAGS_CFI    := -fsanitize=kcfi
 963 KBUILD_CFLAGS   += $(CC_FLAGS_CFI)
 964 export CC_FLAGS_CFI
 965 endif
 966
 967 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
 968 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
 969 endif
 970
 971 # arch Makefile may override CC so keep this after arch Makefile is included
 972 NOSTDINC_FLAGS += -nostdinc
 973
 974 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
 975 # the kernel uses only C99 flexible arrays for dynamically sized trailing
 976 # arrays. Enforce this for everything that may examine structure sizes and
 977 # perform bounds checking.
 978 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
 979
 980 #Currently, disable -Wstringop-overflow for GCC 11, globally.
 981 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
 982 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow)
 983
 984 # disable invalid "can't wrap" optimizations for signed / pointers
 985 KBUILD_CFLAGS   += -fno-strict-overflow
 986
 987 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 988 KBUILD_CFLAGS  += -fno-stack-check
 989
 990 # conserve stack if available
 991 ifdef CONFIG_CC_IS_GCC
 992 KBUILD_CFLAGS   += -fconserve-stack
 993 endif
 994
 995 # change __FILE__ to the relative path from the srctree
 996 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 997
 998 # include additional Makefiles when needed
 999 include-y                       := scripts/Makefile.extrawarn
1000 include-$(CONFIG_DEBUG_INFO)    += scripts/Makefile.debug
1001 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1002 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
1003 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
1004 include-$(CONFIG_KMSAN)         += scripts/Makefile.kmsan
1005 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
1006 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
1007 include-$(CONFIG_RANDSTRUCT)    += scripts/Makefile.randstruct
1008 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
1009
1010 include $(addprefix $(srctree)/, $(include-y))
1011
1012 # scripts/Makefile.gcc-plugins is intentionally included last.
1013 # Do not add $(call cc-option,...) below this line. When you build the kernel
1014 # from the clean source tree, the GCC plugins do not exist at this point.
1015
1016 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1017 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1018 KBUILD_AFLAGS   += $(KAFLAGS)
1019 KBUILD_CFLAGS   += $(KCFLAGS)
1020 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1021
1022 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1023 LDFLAGS_vmlinux += --build-id=sha1
1024
1025 KBUILD_LDFLAGS  += -z noexecstack
1026 ifeq ($(CONFIG_LD_IS_BFD),y)
1027 KBUILD_LDFLAGS  += $(call ld-option,--no-warn-rwx-segments)
1028 endif
1029
1030 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1031 LDFLAGS_vmlinux += -X
1032 endif
1033
1034 ifeq ($(CONFIG_RELR),y)
1035 # ld.lld before 15 did not support -z pack-relative-relocs.
1036 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1037 endif
1038
1039 # We never want expected sections to be placed heuristically by the
1040 # linker. All sections should be explicitly named in the linker script.
1041 ifdef CONFIG_LD_ORPHAN_WARN
1042 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1043 endif
1044
1045 # Align the bit size of userspace programs with the kernel
1046 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1047 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1048
1049 # make the checker run with the right architecture
1050 CHECKFLAGS += --arch=$(ARCH)
1051
1052 # insure the checker run with the right endianness
1053 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1054
1055 # the checker needs the correct machine size
1056 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1057
1058 # Default kernel image to build when no specific target is given.
1059 # KBUILD_IMAGE may be overruled on the command line or
1060 # set in the environment
1061 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1062 # this default value
1063 export KBUILD_IMAGE ?= vmlinux
1064
1065 #
1066 # INSTALL_PATH specifies where to place the updated kernel and system map
1067 # images. Default is /boot, but you can set it to other values
1068 export  INSTALL_PATH ?= /boot
1069
1070 #
1071 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1072 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1073 # an argument if needed. Otherwise it defaults to the kernel install path
1074 #
1075 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1076
1077 #
1078 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1079 # relocations required by build roots.  This is not defined in the
1080 # makefile but the argument can be passed to make if needed.
1081 #
1082
1083 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1084 export MODLIB
1085
1086 PHONY += prepare0
1087
1088 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1089 export MODORDER := $(extmod_prefix)modules.order
1090 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1091
1092 ifeq ($(KBUILD_EXTMOD),)
1093
1094 build-dir       := .
1095 clean-dirs      := $(sort . Documentation \
1096                      $(patsubst %/,%,$(filter %/, $(core-) \
1097                         $(drivers-) $(libs-))))
1098
1099 export ARCH_CORE        := $(core-y)
1100 export ARCH_LIB         := $(filter %/, $(libs-y))
1101 export ARCH_DRIVERS     := $(drivers-y) $(drivers-m)
1102 # Externally visible symbols (used by link-vmlinux.sh)
1103
1104 KBUILD_VMLINUX_OBJS := ./built-in.a
1105 ifdef CONFIG_MODULES
1106 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1107 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1108 else
1109 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1110 endif
1111
1112 export KBUILD_VMLINUX_LIBS
1113 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1114
1115 ifdef CONFIG_TRIM_UNUSED_KSYMS
1116 # For the kernel to actually contain only the needed exported symbols,
1117 # we have to build modules as well to determine what those symbols are.
1118 KBUILD_MODULES := 1
1119 endif
1120
1121 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1122 quiet_cmd_ar_vmlinux.a = AR      $@
1123       cmd_ar_vmlinux.a = \
1124         rm -f $@; \
1125         $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1126         $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1127
1128 targets += vmlinux.a
1129 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1130         $(call if_changed,ar_vmlinux.a)
1131
1132 PHONY += vmlinux_o
1133 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1134         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1135
1136 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1137         @:
1138
1139 PHONY += vmlinux
1140 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1141 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1142 # unrelated; the decompressors just happen to have the same base name,
1143 # arch/*/boot/compressed/vmlinux.
1144 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1145 #
1146 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1147 #   https://savannah.gnu.org/bugs/?61463
1148 # For Make > 4.4, the following simple code will work:
1149 #  vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1150 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1151 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1152 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1153         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1154
1155 # The actual objects are generated when descending,
1156 # make sure no implicit rule kicks in
1157 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1158
1159 ifeq ($(origin KERNELRELEASE),file)
1160 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1161 else
1162 filechk_kernel.release = echo $(KERNELRELEASE)
1163 endif
1164
1165 # Store (new) KERNELRELEASE string in include/config/kernel.release
1166 include/config/kernel.release: FORCE
1167         $(call filechk,kernel.release)
1168
1169 # Additional helpers built in scripts/
1170 # Carefully list dependencies so we do not try to build scripts twice
1171 # in parallel
1172 PHONY += scripts
1173 scripts: scripts_basic scripts_dtc
1174         $(Q)$(MAKE) $(build)=$(@)
1175
1176 # Things we need to do before we recursively start building the kernel
1177 # or the modules are listed in "prepare".
1178 # A multi level approach is used. prepareN is processed before prepareN-1.
1179 # archprepare is used in arch Makefiles and when processed asm symlink,
1180 # version.h and scripts_basic is processed / created.
1181
1182 PHONY += prepare archprepare
1183
1184 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1185         asm-generic $(version_h) include/generated/utsrelease.h \
1186         include/generated/compile.h include/generated/autoconf.h remove-stale-files
1187
1188 prepare0: archprepare
1189         $(Q)$(MAKE) $(build)=scripts/mod
1190         $(Q)$(MAKE) $(build)=. prepare
1191
1192 # All the preparing..
1193 prepare: prepare0
1194 ifdef CONFIG_RUST
1195         +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1196         $(Q)$(MAKE) $(build)=rust
1197 endif
1198
1199 PHONY += remove-stale-files
1200 remove-stale-files:
1201         $(Q)$(srctree)/scripts/remove-stale-files
1202
1203 # Support for using generic headers in asm-generic
1204 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1205
1206 PHONY += asm-generic uapi-asm-generic
1207 asm-generic: uapi-asm-generic
1208         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1209         generic=include/asm-generic
1210 uapi-asm-generic:
1211         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1212         generic=include/uapi/asm-generic
1213
1214 # Generate some files
1215 # ---------------------------------------------------------------------------
1216
1217 # KERNELRELEASE can change from a few different places, meaning version.h
1218 # needs to be updated, so this check is forced on all builds
1219
1220 uts_len := 64
1221 define filechk_utsrelease.h
1222         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1223           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1224           exit 1;                                                         \
1225         fi;                                                               \
1226         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1227 endef
1228
1229 define filechk_version.h
1230         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1231                 echo \#define LINUX_VERSION_CODE $(shell                 \
1232                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1233         else                                                             \
1234                 echo \#define LINUX_VERSION_CODE $(shell                 \
1235                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1236         fi;                                                              \
1237         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1238         ((c) > 255 ? 255 : (c)))';                                       \
1239         echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1240         echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1241         echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1242 endef
1243
1244 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1245 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1246 $(version_h): FORCE
1247         $(call filechk,version.h)
1248
1249 include/generated/utsrelease.h: include/config/kernel.release FORCE
1250         $(call filechk,utsrelease.h)
1251
1252 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1253         "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1254
1255 include/generated/compile.h: FORCE
1256         $(call filechk,compile.h)
1257
1258 PHONY += headerdep
1259 headerdep:
1260         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1261         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1262
1263 # ---------------------------------------------------------------------------
1264 # Kernel headers
1265
1266 #Default location for installed headers
1267 export INSTALL_HDR_PATH = $(objtree)/usr
1268
1269 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1270       cmd_headers_install = \
1271         mkdir -p $(INSTALL_HDR_PATH); \
1272         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1273         usr/include $(INSTALL_HDR_PATH)
1274
1275 PHONY += headers_install
1276 headers_install: headers
1277         $(call cmd,headers_install)
1278
1279 PHONY += archheaders archscripts
1280
1281 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1282
1283 PHONY += headers
1284 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1285         $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1286         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1287         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1288
1289 ifdef CONFIG_HEADERS_INSTALL
1290 prepare: headers
1291 endif
1292
1293 PHONY += scripts_unifdef
1294 scripts_unifdef: scripts_basic
1295         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1296
1297 # ---------------------------------------------------------------------------
1298 # Install
1299
1300 # Many distributions have the custom install script, /sbin/installkernel.
1301 # If DKMS is installed, 'make install' will eventually recurse back
1302 # to this Makefile to build and install external modules.
1303 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1304
1305 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1306       cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1307
1308 # ---------------------------------------------------------------------------
1309 # vDSO install
1310
1311 PHONY += vdso_install
1312 vdso_install: export INSTALL_FILES = $(vdso-install-y)
1313 vdso_install:
1314         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
1315
1316 # ---------------------------------------------------------------------------
1317 # Tools
1318
1319 ifdef CONFIG_OBJTOOL
1320 prepare: tools/objtool
1321 endif
1322
1323 ifdef CONFIG_BPF
1324 ifdef CONFIG_DEBUG_INFO_BTF
1325 prepare: tools/bpf/resolve_btfids
1326 endif
1327 endif
1328
1329 PHONY += resolve_btfids_clean
1330
1331 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1332
1333 # tools/bpf/resolve_btfids directory might not exist
1334 # in output directory, skip its clean in that case
1335 resolve_btfids_clean:
1336 ifneq ($(wildcard $(resolve_btfids_O)),)
1337         $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1338 endif
1339
1340 # Clear a bunch of variables before executing the submake
1341 ifeq ($(quiet),silent_)
1342 tools_silent=s
1343 endif
1344
1345 tools/: FORCE
1346         $(Q)mkdir -p $(objtree)/tools
1347         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1348
1349 tools/%: FORCE
1350         $(Q)mkdir -p $(objtree)/tools
1351         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1352
1353 # ---------------------------------------------------------------------------
1354 # Kernel selftest
1355
1356 PHONY += kselftest
1357 kselftest: headers
1358         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1359
1360 kselftest-%: headers FORCE
1361         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1362
1363 PHONY += kselftest-merge
1364 kselftest-merge:
1365         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1366         $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1367                 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1368         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1369
1370 # ---------------------------------------------------------------------------
1371 # Devicetree files
1372
1373 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1374 dtstree := arch/$(SRCARCH)/boot/dts
1375 endif
1376
1377 ifneq ($(dtstree),)
1378
1379 %.dtb: dtbs_prepare
1380         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1381
1382 %.dtbo: dtbs_prepare
1383         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1384
1385 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1386 dtbs: dtbs_prepare
1387         $(Q)$(MAKE) $(build)=$(dtstree)
1388
1389 # include/config/kernel.release is actually needed when installing DTBs because
1390 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1391 # dtbs_install depend on it as dtbs_install may run as root.
1392 dtbs_prepare: include/config/kernel.release scripts_dtc
1393
1394 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1395 export CHECK_DTBS=y
1396 endif
1397
1398 ifneq ($(CHECK_DTBS),)
1399 dtbs_prepare: dt_binding_check
1400 endif
1401
1402 dtbs_check: dtbs
1403
1404 dtbs_install:
1405         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1406
1407 ifdef CONFIG_OF_EARLY_FLATTREE
1408 all: dtbs
1409 endif
1410
1411 endif
1412
1413 PHONY += scripts_dtc
1414 scripts_dtc: scripts_basic
1415         $(Q)$(MAKE) $(build)=scripts/dtc
1416
1417 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1418 export CHECK_DT_BINDING=y
1419 endif
1420
1421 PHONY += dt_binding_check
1422 dt_binding_check: scripts_dtc
1423         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1424
1425 PHONY += dt_compatible_check
1426 dt_compatible_check: dt_binding_check
1427         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1428
1429 # ---------------------------------------------------------------------------
1430 # Modules
1431
1432 ifdef CONFIG_MODULES
1433
1434 # By default, build modules as well
1435
1436 all: modules
1437
1438 # When we're building modules with modversions, we need to consider
1439 # the built-in objects during the descend as well, in order to
1440 # make sure the checksums are up to date before we record them.
1441 ifdef CONFIG_MODVERSIONS
1442   KBUILD_BUILTIN := 1
1443 endif
1444
1445 # Build modules
1446 #
1447
1448 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1449 # is an exception.
1450 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1451 KBUILD_BUILTIN := 1
1452 modules: vmlinux
1453 endif
1454
1455 modules: modules_prepare
1456
1457 # Target to prepare building external modules
1458 modules_prepare: prepare
1459         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1460
1461 endif # CONFIG_MODULES
1462
1463 ###
1464 # Cleaning is done on three levels.
1465 # make clean     Delete most generated files
1466 #                Leave enough to build external modules
1467 # make mrproper  Delete the current configuration, and all generated files
1468 # make distclean Remove editor backup files, patch leftover files and the like
1469
1470 # Directories & files removed with 'make clean'
1471 CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1472                modules.builtin modules.builtin.modinfo modules.nsdeps \
1473                compile_commands.json .thinlto-cache rust/test \
1474                rust-project.json .vmlinux.objs .vmlinux.export.c
1475
1476 # Directories & files removed with 'make mrproper'
1477 MRPROPER_FILES += include/config include/generated          \
1478                   arch/$(SRCARCH)/include/generated .objdiff \
1479                   debian snap tar-install \
1480                   .config .config.old .version \
1481                   Module.symvers \
1482                   certs/signing_key.pem \
1483                   certs/x509.genkey \
1484                   vmlinux-gdb.py \
1485                   rpmbuild \
1486                   rust/libmacros.so
1487
1488 # clean - Delete most, but leave enough to build external modules
1489 #
1490 clean: rm-files := $(CLEAN_FILES)
1491
1492 PHONY += archclean vmlinuxclean
1493
1494 vmlinuxclean:
1495         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1496         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1497
1498 clean: archclean vmlinuxclean resolve_btfids_clean
1499
1500 # mrproper - Delete all generated files, including .config
1501 #
1502 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1503 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1504
1505 PHONY += $(mrproper-dirs) mrproper
1506 $(mrproper-dirs):
1507         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1508
1509 mrproper: clean $(mrproper-dirs)
1510         $(call cmd,rmfiles)
1511         @find . $(RCS_FIND_IGNORE) \
1512                 \( -name '*.rmeta' \) \
1513                 -type f -print | xargs rm -f
1514
1515 # distclean
1516 #
1517 PHONY += distclean
1518
1519 distclean: mrproper
1520         @find . $(RCS_FIND_IGNORE) \
1521                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1522                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1523                 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1524                 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1525                 -type f -print | xargs rm -f
1526
1527
1528 # Packaging of the kernel to various formats
1529 # ---------------------------------------------------------------------------
1530
1531 %src-pkg: FORCE
1532         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1533 %pkg: include/config/kernel.release FORCE
1534         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1535
1536 # Brief documentation of the typical targets used
1537 # ---------------------------------------------------------------------------
1538
1539 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1540 boards := $(sort $(notdir $(boards)))
1541 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1542 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1543
1544 PHONY += help
1545 help:
1546         @echo  'Cleaning targets:'
1547         @echo  '  clean           - Remove most generated files but keep the config and'
1548         @echo  '                    enough build support to build external modules'
1549         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1550         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1551         @echo  ''
1552         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1553         @echo  ''
1554         @echo  'Other generic targets:'
1555         @echo  '  all             - Build all targets marked with [*]'
1556         @echo  '* vmlinux         - Build the bare kernel'
1557         @echo  '* modules         - Build all modules'
1558         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1559         @echo  '  vdso_install    - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1560         @echo  '  dir/            - Build all files in dir and below'
1561         @echo  '  dir/file.[ois]  - Build specified target only'
1562         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1563         @echo  '                    (requires compiler support for LLVM assembly generation)'
1564         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1565         @echo  '                    (requires a recent binutils and recent build (System.map))'
1566         @echo  '  dir/file.ko     - Build module including final link'
1567         @echo  '  modules_prepare - Set up for building external modules'
1568         @echo  '  tags/TAGS       - Generate tags file for editors'
1569         @echo  '  cscope          - Generate cscope index'
1570         @echo  '  gtags           - Generate GNU GLOBAL index'
1571         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1572         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1573         @echo  '  image_name      - Output the image name (use with make -s)'
1574         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1575          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1576          echo  ''
1577         @echo  'Static analysers:'
1578         @echo  '  checkstack      - Generate a list of stack hogs and consider all functions'
1579         @echo  '                    with a stack size larger than MINSTACKSIZE (default: 100)'
1580         @echo  '  versioncheck    - Sanity check on version.h usage'
1581         @echo  '  includecheck    - Check for duplicate included header files'
1582         @echo  '  export_report   - List the usages of all exported symbols'
1583         @echo  '  headerdep       - Detect inclusion cycles in headers'
1584         @echo  '  coccicheck      - Check with Coccinelle'
1585         @echo  '  clang-analyzer  - Check with clang static analyzer'
1586         @echo  '  clang-tidy      - Check with clang-tidy'
1587         @echo  ''
1588         @echo  'Tools:'
1589         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1590         @echo  ''
1591         @echo  'Kernel selftest:'
1592         @echo  '  kselftest         - Build and run kernel selftest'
1593         @echo  '                      Build, install, and boot kernel before'
1594         @echo  '                      running kselftest on it'
1595         @echo  '                      Run as root for full coverage'
1596         @echo  '  kselftest-all     - Build kernel selftest'
1597         @echo  '  kselftest-install - Build and install kernel selftest'
1598         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1599         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1600         @echo  '                      kselftest to existing .config.'
1601         @echo  ''
1602         @echo  'Rust targets:'
1603         @echo  '  rustavailable   - Checks whether the Rust toolchain is'
1604         @echo  '                    available and, if not, explains why.'
1605         @echo  '  rustfmt         - Reformat all the Rust code in the kernel'
1606         @echo  '  rustfmtcheck    - Checks if all the Rust code in the kernel'
1607         @echo  '                    is formatted, printing a diff otherwise.'
1608         @echo  '  rustdoc         - Generate Rust documentation'
1609         @echo  '                    (requires kernel .config)'
1610         @echo  '  rusttest        - Runs the Rust tests'
1611         @echo  '                    (requires kernel .config; downloads external repos)'
1612         @echo  '  rust-analyzer   - Generate rust-project.json rust-analyzer support file'
1613         @echo  '                    (requires kernel .config)'
1614         @echo  '  dir/file.[os]   - Build specified target only'
1615         @echo  '  dir/file.rsi    - Build macro expanded source, similar to C preprocessing.'
1616         @echo  '                    Run with RUSTFMT=n to skip reformatting if needed.'
1617         @echo  '                    The output is not intended to be compilable.'
1618         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1619         @echo  ''
1620         @$(if $(dtstree), \
1621                 echo 'Devicetree:'; \
1622                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1623                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1624                 echo '  dt_binding_check - Validate device tree binding documents'; \
1625                 echo '  dtbs_check       - Validate device tree source files';\
1626                 echo '')
1627
1628         @echo 'Userspace tools targets:'
1629         @echo '  use "make tools/help"'
1630         @echo '  or  "cd tools; make help"'
1631         @echo  ''
1632         @echo  'Kernel packaging:'
1633         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1634         @echo  ''
1635         @echo  'Documentation targets:'
1636         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1637         @echo  ''
1638         @echo  'Architecture-specific targets ($(SRCARCH)):'
1639         @$(or $(archhelp),\
1640                 echo '  No architecture-specific help defined for $(SRCARCH)')
1641         @echo  ''
1642         @$(if $(boards), \
1643                 $(foreach b, $(boards), \
1644                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1645                 echo '')
1646         @$(if $(board-dirs), \
1647                 $(foreach b, $(board-dirs), \
1648                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1649                 printf "  %-16s - Show all of the above\\n" help-boards; \
1650                 echo '')
1651
1652         @echo  '  make V=n   [targets] 1: verbose build'
1653         @echo  '                       2: give reason for rebuild of target'
1654         @echo  '                       V=1 and V=2 can be combined with V=12'
1655         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1656         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1657         @echo  '                       (sparse by default)'
1658         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1659         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1660         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3,c,e where'
1661         @echo  '                1: warnings which may be relevant and do not occur too often'
1662         @echo  '                2: warnings which occur quite often but may still be relevant'
1663         @echo  '                3: more obscure warnings, can most likely be ignored'
1664         @echo  '                c: extra checks in the configuration stage (Kconfig)'
1665         @echo  '                e: warnings are being treated as errors'
1666         @echo  '                Multiple levels can be combined with W=12 or W=123'
1667         @$(if $(dtstree), \
1668                 echo '  make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1669                 echo '         This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1670                 )
1671         @echo  ''
1672         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1673         @echo  'For further info see the ./README file'
1674
1675
1676 help-board-dirs := $(addprefix help-,$(board-dirs))
1677
1678 help-boards: $(help-board-dirs)
1679
1680 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1681
1682 $(help-board-dirs): help-%:
1683         @echo  'Architecture-specific targets ($(SRCARCH) $*):'
1684         @$(if $(boards-per-dir), \
1685                 $(foreach b, $(boards-per-dir), \
1686                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1687                 echo '')
1688
1689
1690 # Documentation targets
1691 # ---------------------------------------------------------------------------
1692 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1693                linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1694 PHONY += $(DOC_TARGETS)
1695 $(DOC_TARGETS):
1696         $(Q)$(MAKE) $(build)=Documentation $@
1697
1698
1699 # Rust targets
1700 # ---------------------------------------------------------------------------
1701
1702 # "Is Rust available?" target
1703 PHONY += rustavailable
1704 rustavailable:
1705         +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1706
1707 # Documentation target
1708 #
1709 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1710 PHONY += rustdoc
1711 rustdoc: prepare
1712         $(Q)$(MAKE) $(build)=rust $@
1713
1714 # Testing target
1715 PHONY += rusttest
1716 rusttest: prepare
1717         $(Q)$(MAKE) $(build)=rust $@
1718
1719 # Formatting targets
1720 PHONY += rustfmt rustfmtcheck
1721
1722 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1723 #
1724 # We match using absolute paths since `find` does not resolve them
1725 # when matching, which is a problem when e.g. `srctree` is `..`.
1726 # We `grep` afterwards in order to remove the directory entry itself.
1727 rustfmt:
1728         $(Q)find $(abs_srctree) -type f -name '*.rs' \
1729                 -o -path $(abs_srctree)/rust/alloc -prune \
1730                 -o -path $(abs_objtree)/rust/test -prune \
1731                 | grep -Fv $(abs_srctree)/rust/alloc \
1732                 | grep -Fv $(abs_objtree)/rust/test \
1733                 | grep -Fv generated \
1734                 | xargs $(RUSTFMT) $(rustfmt_flags)
1735
1736 rustfmtcheck: rustfmt_flags = --check
1737 rustfmtcheck: rustfmt
1738
1739 # Misc
1740 # ---------------------------------------------------------------------------
1741
1742 PHONY += misc-check
1743 misc-check:
1744         $(Q)$(srctree)/scripts/misc-check
1745
1746 all: misc-check
1747
1748 PHONY += scripts_gdb
1749 scripts_gdb: prepare0
1750         $(Q)$(MAKE) $(build)=scripts/gdb
1751         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1752
1753 ifdef CONFIG_GDB_SCRIPTS
1754 all: scripts_gdb
1755 endif
1756
1757 else # KBUILD_EXTMOD
1758
1759 filechk_kernel.release = echo $(KERNELRELEASE)
1760
1761 ###
1762 # External module support.
1763 # When building external modules the kernel used as basis is considered
1764 # read-only, and no consistency checks are made and the make
1765 # system is not used on the basis kernel. If updates are required
1766 # in the basis kernel ordinary make commands (without M=...) must be used.
1767
1768 # We are always building only modules.
1769 KBUILD_BUILTIN :=
1770 KBUILD_MODULES := 1
1771
1772 build-dir := $(KBUILD_EXTMOD)
1773
1774 compile_commands.json: $(extmod_prefix)compile_commands.json
1775 PHONY += compile_commands.json
1776
1777 clean-dirs := $(KBUILD_EXTMOD)
1778 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1779         $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1780
1781 PHONY += prepare
1782 # now expand this into a simple variable to reduce the cost of shell evaluations
1783 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1784 prepare:
1785         @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1786                 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1787                 echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1788                 echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1789         fi
1790
1791 PHONY += help
1792 help:
1793         @echo  '  Building external modules.'
1794         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1795         @echo  ''
1796         @echo  '  modules         - default target, build the module(s)'
1797         @echo  '  modules_install - install the module'
1798         @echo  '  clean           - remove generated files in module directory only'
1799         @echo  '  rust-analyzer   - generate rust-project.json rust-analyzer support file'
1800         @echo  ''
1801
1802 ifndef CONFIG_MODULES
1803 modules modules_install: __external_modules_error
1804 __external_modules_error:
1805         @echo >&2 '***'
1806         @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1807         @echo >&2 '*** You cannot build or install external modules.'
1808         @echo >&2 '***'
1809         @false
1810 endif
1811
1812 endif # KBUILD_EXTMOD
1813
1814 # ---------------------------------------------------------------------------
1815 # Modules
1816
1817 PHONY += modules modules_install modules_sign modules_prepare
1818
1819 modules_install:
1820         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1821         sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1822
1823 ifeq ($(CONFIG_MODULE_SIG),y)
1824 # modules_sign is a subset of modules_install.
1825 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1826 modules_sign: modules_install
1827         @:
1828 else
1829 modules_sign:
1830         @echo >&2 '***'
1831         @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1832         @echo >&2 '***'
1833         @false
1834 endif
1835
1836 ifdef CONFIG_MODULES
1837
1838 $(MODORDER): $(build-dir)
1839         @:
1840
1841 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1842 # This is solely useful to speed up test compiles.
1843 modules: modpost
1844 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1845         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1846 endif
1847
1848 PHONY += modules_check
1849 modules_check: $(MODORDER)
1850         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1851
1852 else # CONFIG_MODULES
1853
1854 modules:
1855         @:
1856
1857 KBUILD_MODULES :=
1858
1859 endif # CONFIG_MODULES
1860
1861 PHONY += modpost
1862 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1863          $(if $(KBUILD_MODULES), modules_check)
1864         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1865
1866 # Single targets
1867 # ---------------------------------------------------------------------------
1868 # To build individual files in subdirectories, you can do like this:
1869 #
1870 #   make foo/bar/baz.s
1871 #
1872 # The supported suffixes for single-target are listed in 'single-targets'
1873 #
1874 # To build only under specific subdirectories, you can do like this:
1875 #
1876 #   make foo/bar/baz/
1877
1878 ifdef single-build
1879
1880 # .ko is special because modpost is needed
1881 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1882 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1883                 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1884
1885 $(single-ko): single_modules
1886         @:
1887 $(single-no-ko): $(build-dir)
1888         @:
1889
1890 # Remove MODORDER when done because it is not the real one.
1891 PHONY += single_modules
1892 single_modules: $(single-no-ko) modules_prepare
1893         $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
1894         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1895 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1896         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1897 endif
1898         $(Q)rm -f $(MODORDER)
1899
1900 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1901
1902 KBUILD_MODULES := 1
1903
1904 endif
1905
1906 # Preset locale variables to speed up the build process. Limit locale
1907 # tweaks to this spot to avoid wrong language settings when running
1908 # make menuconfig etc.
1909 # Error messages still appears in the original language
1910 PHONY += $(build-dir)
1911 $(build-dir): prepare
1912         $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
1913
1914 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1915 PHONY += $(clean-dirs) clean
1916 $(clean-dirs):
1917         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1918
1919 clean: $(clean-dirs)
1920         $(call cmd,rmfiles)
1921         @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1922                 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
1923                 -o -name '*.ko.*' \
1924                 -o -name '*.dtb' -o -name '*.dtbo' \
1925                 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
1926                 -o -name '*.dt.yaml' \
1927                 -o -name '*.dwo' -o -name '*.lst' \
1928                 -o -name '*.su' -o -name '*.mod' \
1929                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1930                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1931                 -o -name '*.asn1.[ch]' \
1932                 -o -name '*.symtypes' -o -name 'modules.order' \
1933                 -o -name '*.c.[012]*.*' \
1934                 -o -name '*.ll' \
1935                 -o -name '*.gcno' \
1936                 -o -name '*.*.symversions' \) -type f -print \
1937                 -o -name '.tmp_*' -print \
1938                 | xargs rm -rf
1939
1940 # Generate tags for editors
1941 # ---------------------------------------------------------------------------
1942 quiet_cmd_tags = GEN     $@
1943       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1944
1945 tags TAGS cscope gtags: FORCE
1946         $(call cmd,tags)
1947
1948 # IDE support targets
1949 PHONY += rust-analyzer
1950 rust-analyzer:
1951         $(Q)$(MAKE) $(build)=rust $@
1952
1953 # Script to generate missing namespace dependencies
1954 # ---------------------------------------------------------------------------
1955
1956 PHONY += nsdeps
1957 nsdeps: export KBUILD_NSDEPS=1
1958 nsdeps: modules
1959         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1960
1961 # Clang Tooling
1962 # ---------------------------------------------------------------------------
1963
1964 quiet_cmd_gen_compile_commands = GEN     $@
1965       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1966
1967 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1968         $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
1969         $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1970         $(call if_changed,gen_compile_commands)
1971
1972 targets += $(extmod_prefix)compile_commands.json
1973
1974 PHONY += clang-tidy clang-analyzer
1975
1976 ifdef CONFIG_CC_IS_CLANG
1977 quiet_cmd_clang_tools = CHECK   $<
1978       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1979
1980 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1981         $(call cmd,clang_tools)
1982 else
1983 clang-tidy clang-analyzer:
1984         @echo "$@ requires CC=clang" >&2
1985         @false
1986 endif
1987
1988 # Scripts to check various things for consistency
1989 # ---------------------------------------------------------------------------
1990
1991 PHONY += includecheck versioncheck coccicheck export_report
1992
1993 includecheck:
1994         find $(srctree)/* $(RCS_FIND_IGNORE) \
1995                 -name '*.[hcS]' -type f -print | sort \
1996                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1997
1998 versioncheck:
1999         find $(srctree)/* $(RCS_FIND_IGNORE) \
2000                 -name '*.[hcS]' -type f -print | sort \
2001                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2002
2003 coccicheck:
2004         $(Q)$(BASH) $(srctree)/scripts/$@
2005
2006 export_report:
2007         $(PERL) $(srctree)/scripts/export_report.pl
2008
2009 PHONY += checkstack kernelrelease kernelversion image_name
2010
2011 # UML needs a little special treatment here.  It wants to use the host
2012 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
2013 # else wants $(ARCH), including people doing cross-builds, which means
2014 # that $(SUBARCH) doesn't work here.
2015 ifeq ($(ARCH), um)
2016 CHECKSTACK_ARCH := $(SUBARCH)
2017 else
2018 CHECKSTACK_ARCH := $(ARCH)
2019 endif
2020 MINSTACKSIZE    ?= 100
2021 checkstack:
2022         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2023         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE)
2024
2025 kernelrelease:
2026         @$(filechk_kernel.release)
2027
2028 kernelversion:
2029         @echo $(KERNELVERSION)
2030
2031 image_name:
2032         @echo $(KBUILD_IMAGE)
2033
2034 PHONY += run-command
2035 run-command:
2036         $(Q)$(KBUILD_RUN_COMMAND)
2037
2038 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
2039       cmd_rmfiles = rm -rf $(rm-files)
2040
2041 # read saved command lines for existing targets
2042 existing-targets := $(wildcard $(sort $(targets)))
2043
2044 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2045
2046 endif # config-build
2047 endif # mixed-build
2048 endif # need-sub-make
2049
2050 PHONY += FORCE
2051 FORCE:
2052
2053 # Declare the contents of the PHONY variable as phony.  We keep that
2054 # information in a variable so we can use it in if_changed and friends.
2055 .PHONY: $(PHONY)