Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 6
   3 PATCHLEVEL = 11
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc1
   6 NAME = Baby Opossum Posse
   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 ($(filter output-sync,$(.FEATURES)),)
  15 $(error GNU Make >= 4.0 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 abs_srctree := $(realpath $(dir $(this-makefile)))
  43 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, $(KBUILD_VERBOSE)),)
  90   quiet =
  91   Q =
  92 endif
  93
  94 # If the user is running make -s (silent mode), suppress echoing of
  95 # commands
  96 ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),)
  97 quiet=silent_
  98 override KBUILD_VERBOSE :=
  99 endif
 100
 101 export quiet Q KBUILD_VERBOSE
 102
 103 # Call a source code checker (by default, "sparse") as part of the
 104 # C compilation.
 105 #
 106 # Use 'make C=1' to enable checking of only re-compiled files.
 107 # Use 'make C=2' to enable checking of *all* source files, regardless
 108 # of whether they are re-compiled or not.
 109 #
 110 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 111 # including where to get the "sparse" utility.
 112
 113 ifeq ("$(origin C)", "command line")
 114   KBUILD_CHECKSRC = $(C)
 115 endif
 116 ifndef KBUILD_CHECKSRC
 117   KBUILD_CHECKSRC = 0
 118 endif
 119
 120 export KBUILD_CHECKSRC
 121
 122 # Enable "clippy" (a linter) as part of the Rust compilation.
 123 #
 124 # Use 'make CLIPPY=1' to enable it.
 125 ifeq ("$(origin CLIPPY)", "command line")
 126   KBUILD_CLIPPY := $(CLIPPY)
 127 endif
 128
 129 export KBUILD_CLIPPY
 130
 131 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 132 # directory of external module to build. Setting M= takes precedence.
 133 ifeq ("$(origin M)", "command line")
 134   KBUILD_EXTMOD := $(M)
 135 endif
 136
 137 $(if $(word 2, $(KBUILD_EXTMOD)), \
 138         $(error building multiple external modules is not supported))
 139
 140 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
 141         $(error module directory path cannot contain '$x')))
 142
 143 # Remove trailing slashes
 144 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
 145 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
 146 endif
 147
 148 export KBUILD_EXTMOD
 149
 150 # backward compatibility
 151 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
 152
 153 ifeq ("$(origin W)", "command line")
 154   KBUILD_EXTRA_WARN := $(W)
 155 endif
 156
 157 export KBUILD_EXTRA_WARN
 158
 159 # Kbuild will save output files in the current working directory.
 160 # This does not need to match to the root of the kernel source tree.
 161 #
 162 # For example, you can do this:
 163 #
 164 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 165 #
 166 # If you want to save output files in a different location, there are
 167 # two syntaxes to specify it.
 168 #
 169 # 1) O=
 170 # Use "make O=dir/to/store/output/files/"
 171 #
 172 # 2) Set KBUILD_OUTPUT
 173 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 174 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 175 #
 176 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 177 # variable.
 178
 179 # Do we want to change the working directory?
 180 ifeq ("$(origin O)", "command line")
 181   KBUILD_OUTPUT := $(O)
 182 endif
 183
 184 ifneq ($(KBUILD_OUTPUT),)
 185 # $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
 186 $(shell mkdir -p "$(KBUILD_OUTPUT)")
 187 # $(realpath ...) resolves symlinks
 188 abs_objtree := $(realpath $(KBUILD_OUTPUT))
 189 $(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)"))
 190 endif # ifneq ($(KBUILD_OUTPUT),)
 191
 192 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 193 $(error source directory cannot contain spaces or colons)
 194 endif
 195
 196 export sub_make_done := 1
 197
 198 endif # sub_make_done
 199
 200 ifeq ($(abs_objtree),$(CURDIR))
 201 # Suppress "Entering directory ..." if we are at the final work directory.
 202 no-print-directory := --no-print-directory
 203 else
 204 # Recursion to show "Entering directory ..."
 205 need-sub-make := 1
 206 endif
 207
 208 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
 209 # If --no-print-directory is unset, recurse once again to set it.
 210 # You may end up recursing into __sub-make twice. This is needed due to the
 211 # behavior change in GNU Make 4.4.1.
 212 need-sub-make := 1
 213 endif
 214
 215 ifeq ($(need-sub-make),1)
 216
 217 PHONY += $(MAKECMDGOALS) __sub-make
 218
 219 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 220         @:
 221
 222 # Invoke a second make in the output directory, passing relevant variables
 223 __sub-make:
 224         $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
 225         -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 226
 227 else # need-sub-make
 228
 229 # We process the rest of the Makefile if this is the final invocation of make
 230
 231 ifeq ($(abs_srctree),$(abs_objtree))
 232         # building in the source tree
 233         srctree := .
 234         building_out_of_srctree :=
 235 else
 236         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 237                 # building in a subdirectory of the source tree
 238                 srctree := ..
 239         else
 240                 srctree := $(abs_srctree)
 241         endif
 242         building_out_of_srctree := 1
 243 endif
 244
 245 ifneq ($(KBUILD_ABS_SRCTREE),)
 246 srctree := $(abs_srctree)
 247 endif
 248
 249 objtree         := .
 250
 251 VPATH           :=
 252
 253 ifeq ($(KBUILD_EXTMOD),)
 254 ifdef building_out_of_srctree
 255 VPATH           := $(srctree)
 256 endif
 257 endif
 258
 259 export building_out_of_srctree srctree objtree VPATH
 260
 261 # To make sure we do not include .config for any of the *config targets
 262 # catch them early, and hand them over to scripts/kconfig/Makefile
 263 # It is allowed to specify more targets when calling make, including
 264 # mixing *config targets and build targets.
 265 # For example 'make oldconfig all'.
 266 # Detect when mixed targets is specified, and make a second invocation
 267 # of make so .config is not included in this case either (for *config).
 268
 269 version_h := include/generated/uapi/linux/version.h
 270
 271 clean-targets := %clean mrproper cleandocs
 272 no-dot-config-targets := $(clean-targets) \
 273                          cscope gtags TAGS tags help% %docs check% coccicheck \
 274                          $(version_h) headers headers_% archheaders archscripts \
 275                          %asm-generic kernelversion %src-pkg dt_binding_check \
 276                          outputmakefile rustavailable rustfmt rustfmtcheck
 277 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
 278                           image_name
 279 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
 280
 281 config-build    :=
 282 mixed-build     :=
 283 need-config     := 1
 284 may-sync-config := 1
 285 single-build    :=
 286
 287 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 288     ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 289         need-config :=
 290     endif
 291 endif
 292
 293 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 294     ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 295         may-sync-config :=
 296     endif
 297 endif
 298
 299 need-compiler := $(may-sync-config)
 300
 301 ifneq ($(KBUILD_EXTMOD),)
 302     may-sync-config :=
 303 endif
 304
 305 ifeq ($(KBUILD_EXTMOD),)
 306     ifneq ($(filter %config,$(MAKECMDGOALS)),)
 307         config-build := 1
 308         ifneq ($(words $(MAKECMDGOALS)),1)
 309             mixed-build := 1
 310         endif
 311     endif
 312 endif
 313
 314 # We cannot build single targets and the others at the same time
 315 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 316     single-build := 1
 317     ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 318         mixed-build := 1
 319     endif
 320 endif
 321
 322 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 323 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 324     ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 325         mixed-build := 1
 326     endif
 327 endif
 328
 329 # install and modules_install need also be processed one by one
 330 ifneq ($(filter install,$(MAKECMDGOALS)),)
 331     ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 332         mixed-build := 1
 333     endif
 334 endif
 335
 336 ifdef mixed-build
 337 # ===========================================================================
 338 # We're called with mixed targets (*config and build targets).
 339 # Handle them one by one.
 340
 341 PHONY += $(MAKECMDGOALS) __build_one_by_one
 342
 343 $(MAKECMDGOALS): __build_one_by_one
 344         @:
 345
 346 __build_one_by_one:
 347         $(Q)set -e; \
 348         for i in $(MAKECMDGOALS); do \
 349                 $(MAKE) -f $(srctree)/Makefile $$i; \
 350         done
 351
 352 else # !mixed-build
 353
 354 include $(srctree)/scripts/Kbuild.include
 355
 356 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 357 KERNELRELEASE = $(call read-file, include/config/kernel.release)
 358 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 359 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 360
 361 include $(srctree)/scripts/subarch.include
 362
 363 # Cross compiling and selecting different set of gcc/bin-utils
 364 # ---------------------------------------------------------------------------
 365 #
 366 # When performing cross compilation for other architectures ARCH shall be set
 367 # to the target architecture. (See arch/* for the possibilities).
 368 # ARCH can be set during invocation of make:
 369 # make ARCH=arm64
 370 # Another way is to have ARCH set in the environment.
 371 # The default ARCH is the host where make is executed.
 372
 373 # CROSS_COMPILE specify the prefix used for all executables used
 374 # during compilation. Only gcc and related bin-utils executables
 375 # are prefixed with $(CROSS_COMPILE).
 376 # CROSS_COMPILE can be set on the command line
 377 # make CROSS_COMPILE=aarch64-linux-gnu-
 378 # Alternatively CROSS_COMPILE can be set in the environment.
 379 # Default value for CROSS_COMPILE is not to prefix executables
 380 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 381 ARCH            ?= $(SUBARCH)
 382
 383 # Architecture as present in compile.h
 384 UTS_MACHINE     := $(ARCH)
 385 SRCARCH         := $(ARCH)
 386
 387 # Additional ARCH settings for x86
 388 ifeq ($(ARCH),i386)
 389         SRCARCH := x86
 390 endif
 391 ifeq ($(ARCH),x86_64)
 392         SRCARCH := x86
 393 endif
 394
 395 # Additional ARCH settings for sparc
 396 ifeq ($(ARCH),sparc32)
 397        SRCARCH := sparc
 398 endif
 399 ifeq ($(ARCH),sparc64)
 400        SRCARCH := sparc
 401 endif
 402
 403 # Additional ARCH settings for parisc
 404 ifeq ($(ARCH),parisc64)
 405        SRCARCH := parisc
 406 endif
 407
 408 export cross_compiling :=
 409 ifneq ($(SRCARCH),$(SUBARCH))
 410 cross_compiling := 1
 411 endif
 412
 413 KCONFIG_CONFIG  ?= .config
 414 export KCONFIG_CONFIG
 415
 416 # SHELL used by kbuild
 417 CONFIG_SHELL := sh
 418
 419 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 420 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 421 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 422
 423 ifneq ($(LLVM),)
 424 ifneq ($(filter %/,$(LLVM)),)
 425 LLVM_PREFIX := $(LLVM)
 426 else ifneq ($(filter -%,$(LLVM)),)
 427 LLVM_SUFFIX := $(LLVM)
 428 endif
 429
 430 HOSTCC  = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 431 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
 432 else
 433 HOSTCC  = gcc
 434 HOSTCXX = g++
 435 endif
 436 HOSTRUSTC = rustc
 437 HOSTPKG_CONFIG  = pkg-config
 438
 439 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 440                          -O2 -fomit-frame-pointer -std=gnu11
 441 KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
 442 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
 443
 444 # These flags apply to all Rust code in the tree, including the kernel and
 445 # host programs.
 446 export rust_common_flags := --edition=2021 \
 447                             -Zbinary_dep_depinfo=y \
 448                             -Dunsafe_op_in_unsafe_fn \
 449                             -Dnon_ascii_idents \
 450                             -Wrust_2018_idioms \
 451                             -Wunreachable_pub \
 452                             -Wmissing_docs \
 453                             -Wrustdoc::missing_crate_level_docs \
 454                             -Wclippy::all \
 455                             -Wclippy::mut_mut \
 456                             -Wclippy::needless_bitwise_bool \
 457                             -Wclippy::needless_continue \
 458                             -Wclippy::no_mangle_with_rust_abi \
 459                             -Wclippy::dbg_macro
 460
 461 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \
 462                        $(HOSTCFLAGS) -I $(srctree)/scripts/include
 463 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \
 464                        -I $(srctree)/scripts/include
 465 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
 466                         -Zallow-features= $(HOSTRUSTFLAGS)
 467 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 468 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 469
 470 # Make variables (CC, etc...)
 471 CPP             = $(CC) -E
 472 ifneq ($(LLVM),)
 473 CC              = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 474 LD              = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
 475 AR              = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
 476 NM              = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
 477 OBJCOPY         = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
 478 OBJDUMP         = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
 479 READELF         = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
 480 STRIP           = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
 481 else
 482 CC              = $(CROSS_COMPILE)gcc
 483 LD              = $(CROSS_COMPILE)ld
 484 AR              = $(CROSS_COMPILE)ar
 485 NM              = $(CROSS_COMPILE)nm
 486 OBJCOPY         = $(CROSS_COMPILE)objcopy
 487 OBJDUMP         = $(CROSS_COMPILE)objdump
 488 READELF         = $(CROSS_COMPILE)readelf
 489 STRIP           = $(CROSS_COMPILE)strip
 490 endif
 491 RUSTC           = rustc
 492 RUSTDOC         = rustdoc
 493 RUSTFMT         = rustfmt
 494 CLIPPY_DRIVER   = clippy-driver
 495 BINDGEN         = bindgen
 496 PAHOLE          = pahole
 497 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 498 LEX             = flex
 499 YACC            = bison
 500 AWK             = awk
 501 INSTALLKERNEL  := installkernel
 502 PERL            = perl
 503 PYTHON3         = python3
 504 CHECK           = sparse
 505 BASH            = bash
 506 KGZIP           = gzip
 507 KBZIP2          = bzip2
 508 KLZOP           = lzop
 509 LZMA            = lzma
 510 LZ4             = lz4c
 511 XZ              = xz
 512 ZSTD            = zstd
 513
 514 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 515                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 516 NOSTDINC_FLAGS :=
 517 CFLAGS_MODULE   =
 518 RUSTFLAGS_MODULE =
 519 AFLAGS_MODULE   =
 520 LDFLAGS_MODULE  =
 521 CFLAGS_KERNEL   =
 522 RUSTFLAGS_KERNEL =
 523 AFLAGS_KERNEL   =
 524 LDFLAGS_vmlinux =
 525
 526 # Use USERINCLUDE when you must reference the UAPI directories only.
 527 USERINCLUDE    := \
 528                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 529                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 530                 -I$(srctree)/include/uapi \
 531                 -I$(objtree)/include/generated/uapi \
 532                 -include $(srctree)/include/linux/compiler-version.h \
 533                 -include $(srctree)/include/linux/kconfig.h
 534
 535 # Use LINUXINCLUDE when you must reference the include/ directory.
 536 # Needed to be compatible with the O= option
 537 LINUXINCLUDE    := \
 538                 -I$(srctree)/arch/$(SRCARCH)/include \
 539                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 540                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 541                 -I$(objtree)/include \
 542                 $(USERINCLUDE)
 543
 544 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 545
 546 KBUILD_CFLAGS :=
 547 KBUILD_CFLAGS += -std=gnu11
 548 KBUILD_CFLAGS += -fshort-wchar
 549 KBUILD_CFLAGS += -funsigned-char
 550 KBUILD_CFLAGS += -fno-common
 551 KBUILD_CFLAGS += -fno-PIE
 552 KBUILD_CFLAGS += -fno-strict-aliasing
 553
 554 KBUILD_CPPFLAGS := -D__KERNEL__
 555 KBUILD_RUSTFLAGS := $(rust_common_flags) \
 556                     -Cpanic=abort -Cembed-bitcode=n -Clto=n \
 557                     -Cforce-unwind-tables=n -Ccodegen-units=1 \
 558                     -Csymbol-mangling-version=v0 \
 559                     -Crelocation-model=static \
 560                     -Zfunction-sections=n \
 561                     -Wclippy::float_arithmetic
 562
 563 KBUILD_AFLAGS_KERNEL :=
 564 KBUILD_CFLAGS_KERNEL :=
 565 KBUILD_RUSTFLAGS_KERNEL :=
 566 KBUILD_AFLAGS_MODULE  := -DMODULE
 567 KBUILD_CFLAGS_MODULE  := -DMODULE
 568 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
 569 KBUILD_LDFLAGS_MODULE :=
 570 KBUILD_LDFLAGS :=
 571 CLANG_FLAGS :=
 572
 573 ifeq ($(KBUILD_CLIPPY),1)
 574         RUSTC_OR_CLIPPY_QUIET := CLIPPY
 575         RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
 576 else
 577         RUSTC_OR_CLIPPY_QUIET := RUSTC
 578         RUSTC_OR_CLIPPY = $(RUSTC)
 579 endif
 580
 581 ifdef RUST_LIB_SRC
 582         export RUST_LIB_SRC
 583 endif
 584
 585 # Allows the usage of unstable features in stable compilers.
 586 export RUSTC_BOOTSTRAP := 1
 587
 588 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
 589 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN
 590 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
 591 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 592 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 593 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 594 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 595 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
 596
 597 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 598 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 599 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
 600 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 601 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 602 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
 603
 604 # Files to ignore in find ... statements
 605
 606 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 607                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 608                           -prune -o
 609
 610 # ===========================================================================
 611 # Rules shared between *config targets and build targets
 612
 613 # Basic helpers built in scripts/basic/
 614 PHONY += scripts_basic
 615 scripts_basic:
 616         $(Q)$(MAKE) $(build)=scripts/basic
 617
 618 PHONY += outputmakefile
 619 ifdef building_out_of_srctree
 620 # Before starting out-of-tree build, make sure the source tree is clean.
 621 # outputmakefile generates a Makefile in the output directory, if using a
 622 # separate output directory. This allows convenient use of make in the
 623 # output directory.
 624 # At the same time when output Makefile generated, generate .gitignore to
 625 # ignore whole output directory
 626
 627 quiet_cmd_makefile = GEN     Makefile
 628       cmd_makefile = { \
 629         echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
 630         echo "include $(srctree)/Makefile"; \
 631         } > Makefile
 632
 633 outputmakefile:
 634         @if [ -f $(srctree)/.config -o \
 635                  -d $(srctree)/include/config -o \
 636                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 637                 echo >&2 "***"; \
 638                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 639                 echo >&2 "*** in $(abs_srctree)";\
 640                 echo >&2 "***"; \
 641                 false; \
 642         fi
 643         $(Q)ln -fsn $(srctree) source
 644         $(call cmd,makefile)
 645         $(Q)test -e .gitignore || \
 646         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 647 endif
 648
 649 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 650 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 651 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 652 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 653 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
 654
 655 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 656 include $(srctree)/scripts/Makefile.clang
 657 endif
 658
 659 # Include this also for config targets because some architectures need
 660 # cc-cross-prefix to determine CROSS_COMPILE.
 661 ifdef need-compiler
 662 include $(srctree)/scripts/Makefile.compiler
 663 endif
 664
 665 ifdef config-build
 666 # ===========================================================================
 667 # *config targets only - make sure prerequisites are updated, and descend
 668 # in scripts/kconfig to make the *config target
 669
 670 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
 671 # KBUILD_DEFCONFIG may point out an alternative default configuration
 672 # used for 'make defconfig'
 673 include $(srctree)/arch/$(SRCARCH)/Makefile
 674 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 675
 676 config: outputmakefile scripts_basic FORCE
 677         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 678
 679 %config: outputmakefile scripts_basic FORCE
 680         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 681
 682 else #!config-build
 683 # ===========================================================================
 684 # Build targets only - this includes vmlinux, arch-specific targets, clean
 685 # targets and others. In general all targets except *config targets.
 686
 687 # If building an external module we do not care about the all: rule
 688 # but instead __all depend on modules
 689 PHONY += all
 690 ifeq ($(KBUILD_EXTMOD),)
 691 __all: all
 692 else
 693 __all: modules
 694 endif
 695
 696 targets :=
 697
 698 # Decide whether to build built-in, modular, or both.
 699 # Normally, just do built-in.
 700
 701 KBUILD_MODULES :=
 702 KBUILD_BUILTIN := 1
 703
 704 # If we have only "make modules", don't compile built-in objects.
 705 ifeq ($(MAKECMDGOALS),modules)
 706   KBUILD_BUILTIN :=
 707 endif
 708
 709 # If we have "make <whatever> modules", compile modules
 710 # in addition to whatever we do anyway.
 711 # Just "make" or "make all" shall build modules as well
 712
 713 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
 714   KBUILD_MODULES := 1
 715 endif
 716
 717 ifeq ($(MAKECMDGOALS),)
 718   KBUILD_MODULES := 1
 719 endif
 720
 721 export KBUILD_MODULES KBUILD_BUILTIN
 722
 723 ifdef need-config
 724 include include/config/auto.conf
 725 endif
 726
 727 ifeq ($(KBUILD_EXTMOD),)
 728 # Objects we will link into vmlinux / subdirs we need to visit
 729 core-y          :=
 730 drivers-y       :=
 731 libs-y          := lib/
 732 endif # KBUILD_EXTMOD
 733
 734 # The all: target is the default when no target is given on the
 735 # command line.
 736 # This allow a user to issue only 'make' to build a kernel including modules
 737 # Defaults to vmlinux, but the arch makefile usually adds further targets
 738 all: vmlinux
 739
 740 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage
 741 ifdef CONFIG_CC_IS_GCC
 742 CFLAGS_GCOV     += -fno-tree-loop-im
 743 endif
 744 export CFLAGS_GCOV
 745
 746 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 747 ifdef CONFIG_FUNCTION_TRACER
 748   CC_FLAGS_FTRACE := -pg
 749 endif
 750
 751 include $(srctree)/arch/$(SRCARCH)/Makefile
 752
 753 ifdef need-config
 754 ifdef may-sync-config
 755 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 756 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 757 # because some architectures define CROSS_COMPILE there.
 758 include include/config/auto.conf.cmd
 759
 760 $(KCONFIG_CONFIG):
 761         @echo >&2 '***'
 762         @echo >&2 '*** Configuration file "$@" not found!'
 763         @echo >&2 '***'
 764         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 765         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 766         @echo >&2 '***'
 767         @/bin/false
 768
 769 # The actual configuration files used during the build are stored in
 770 # include/generated/ and include/config/. Update them if .config is newer than
 771 # include/config/auto.conf (which mirrors .config).
 772 #
 773 # This exploits the 'multi-target pattern rule' trick.
 774 # The syncconfig should be executed only once to make all the targets.
 775 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 776 #
 777 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
 778 # so you cannot notice that Kconfig is waiting for the user input.
 779 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
 780         $(Q)$(kecho) "  SYNC    $@"
 781         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 782 else # !may-sync-config
 783 # External modules and some install targets need include/generated/autoconf.h
 784 # and include/config/auto.conf but do not care if they are up-to-date.
 785 # Use auto.conf to trigger the test
 786 PHONY += include/config/auto.conf
 787
 788 include/config/auto.conf:
 789         @test -e include/generated/autoconf.h -a -e $@ || (             \
 790         echo >&2;                                                       \
 791         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 792         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 793         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 794         echo >&2 ;                                                      \
 795         /bin/false)
 796
 797 endif # may-sync-config
 798 endif # need-config
 799
 800 KBUILD_CFLAGS   += -fno-delete-null-pointer-checks
 801
 802 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 803 KBUILD_CFLAGS += -O2
 804 KBUILD_RUSTFLAGS += -Copt-level=2
 805 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 806 KBUILD_CFLAGS += -Os
 807 KBUILD_RUSTFLAGS += -Copt-level=s
 808 endif
 809
 810 # Always set `debug-assertions` and `overflow-checks` because their default
 811 # depends on `opt-level` and `debug-assertions`, respectively.
 812 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
 813 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
 814
 815 # Tell gcc to never replace conditional load with a non-conditional one
 816 ifdef CONFIG_CC_IS_GCC
 817 # gcc-10 renamed --param=allow-store-data-races=0 to
 818 # -fno-allow-store-data-races.
 819 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 820 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 821 endif
 822
 823 ifdef CONFIG_READABLE_ASM
 824 # Disable optimizations that make assembler listings hard to read.
 825 # reorder blocks reorders the control in the function
 826 # ipa clone creates specialized cloned functions
 827 # partial inlining inlines only parts of functions
 828 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
 829 endif
 830
 831 stackp-flags-y                                    := -fno-stack-protector
 832 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 833 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 834
 835 KBUILD_CFLAGS += $(stackp-flags-y)
 836
 837 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
 838 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
 839
 840 ifdef CONFIG_FRAME_POINTER
 841 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 842 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
 843 else
 844 # Some targets (ARM with Thumb2, for example), can't be built with frame
 845 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 846 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 847 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 848 # -fomit-frame-pointer with FUNCTION_TRACER.
 849 # In the Rust target specification, "frame-pointer" is set explicitly
 850 # to "may-omit".
 851 ifndef CONFIG_FUNCTION_TRACER
 852 KBUILD_CFLAGS   += -fomit-frame-pointer
 853 endif
 854 endif
 855
 856 # Initialize all stack variables with a 0xAA pattern.
 857 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 858 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 859 endif
 860
 861 # Initialize all stack variables with a zero value.
 862 ifdef CONFIG_INIT_STACK_ALL_ZERO
 863 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 864 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
 865 # https://github.com/llvm/llvm-project/issues/44842
 866 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 867 export CC_AUTO_VAR_INIT_ZERO_ENABLER
 868 KBUILD_CFLAGS   += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
 869 endif
 870 endif
 871
 872 # While VLAs have been removed, GCC produces unreachable stack probes
 873 # for the randomize_kstack_offset feature. Disable it for all compilers.
 874 KBUILD_CFLAGS   += $(call cc-option, -fno-stack-clash-protection)
 875
 876 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
 877 ifdef CONFIG_ZERO_CALL_USED_REGS
 878 KBUILD_CFLAGS   += -fzero-call-used-regs=used-gpr
 879 endif
 880
 881 ifdef CONFIG_FUNCTION_TRACER
 882 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 883   CC_FLAGS_FTRACE       += -mrecord-mcount
 884   ifdef CONFIG_HAVE_NOP_MCOUNT
 885     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 886       CC_FLAGS_FTRACE   += -mnop-mcount
 887       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 888     endif
 889   endif
 890 endif
 891 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 892   ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
 893     CC_FLAGS_USING      += -DCC_USING_NOP_MCOUNT
 894   endif
 895 endif
 896 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 897   ifdef CONFIG_HAVE_C_RECORDMCOUNT
 898     BUILD_C_RECORDMCOUNT := y
 899     export BUILD_C_RECORDMCOUNT
 900   endif
 901 endif
 902 ifdef CONFIG_HAVE_FENTRY
 903   # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
 904   ifeq ($(call cc-option-yn, -mfentry),y)
 905     CC_FLAGS_FTRACE     += -mfentry
 906     CC_FLAGS_USING      += -DCC_USING_FENTRY
 907   endif
 908 endif
 909 export CC_FLAGS_FTRACE
 910 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 911 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 912 endif
 913
 914 # We trigger additional mismatches with less inlining
 915 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 916 KBUILD_CFLAGS += -fno-inline-functions-called-once
 917 endif
 918
 919 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
 920 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 921 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 922 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
 923 LDFLAGS_vmlinux += --gc-sections
 924 endif
 925
 926 ifdef CONFIG_SHADOW_CALL_STACK
 927 ifndef CONFIG_DYNAMIC_SCS
 928 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 929 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 930 endif
 931 export CC_FLAGS_SCS
 932 endif
 933
 934 ifdef CONFIG_LTO_CLANG
 935 ifdef CONFIG_LTO_CLANG_THIN
 936 CC_FLAGS_LTO    := -flto=thin -fsplit-lto-unit
 937 else
 938 CC_FLAGS_LTO    := -flto
 939 endif
 940 CC_FLAGS_LTO    += -fvisibility=hidden
 941
 942 # Limit inlining across translation units to reduce binary size
 943 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
 944 endif
 945
 946 ifdef CONFIG_LTO
 947 KBUILD_CFLAGS   += -fno-lto $(CC_FLAGS_LTO)
 948 KBUILD_AFLAGS   += -fno-lto
 949 export CC_FLAGS_LTO
 950 endif
 951
 952 ifdef CONFIG_CFI_CLANG
 953 CC_FLAGS_CFI    := -fsanitize=kcfi
 954 KBUILD_CFLAGS   += $(CC_FLAGS_CFI)
 955 export CC_FLAGS_CFI
 956 endif
 957
 958 # Architectures can define flags to add/remove for floating-point support
 959 CC_FLAGS_FPU    += -D_LINUX_FPU_COMPILATION_UNIT
 960 export CC_FLAGS_FPU
 961 export CC_FLAGS_NO_FPU
 962
 963 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
 964 # Set the minimal function alignment. Use the newer GCC option
 965 # -fmin-function-alignment if it is available, or fall back to -falign-funtions.
 966 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT.
 967 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT
 968 KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT)
 969 else
 970 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
 971 endif
 972 endif
 973
 974 # arch Makefile may override CC so keep this after arch Makefile is included
 975 NOSTDINC_FLAGS += -nostdinc
 976
 977 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
 978 # the kernel uses only C99 flexible arrays for dynamically sized trailing
 979 # arrays. Enforce this for everything that may examine structure sizes and
 980 # perform bounds checking.
 981 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
 982
 983 #Currently, disable -Wstringop-overflow for GCC 11, globally.
 984 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
 985 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow)
 986
 987 # disable invalid "can't wrap" optimizations for signed / pointers
 988 KBUILD_CFLAGS   += -fno-strict-overflow
 989
 990 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 991 KBUILD_CFLAGS  += -fno-stack-check
 992
 993 # conserve stack if available
 994 ifdef CONFIG_CC_IS_GCC
 995 KBUILD_CFLAGS   += -fconserve-stack
 996 endif
 997
 998 # change __FILE__ to the relative path from the srctree
 999 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1000
1001 # include additional Makefiles when needed
1002 include-y                       := scripts/Makefile.extrawarn
1003 include-$(CONFIG_DEBUG_INFO)    += scripts/Makefile.debug
1004 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1005 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
1006 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
1007 include-$(CONFIG_KMSAN)         += scripts/Makefile.kmsan
1008 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
1009 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
1010 include-$(CONFIG_RANDSTRUCT)    += scripts/Makefile.randstruct
1011 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
1012
1013 include $(addprefix $(srctree)/, $(include-y))
1014
1015 # scripts/Makefile.gcc-plugins is intentionally included last.
1016 # Do not add $(call cc-option,...) below this line. When you build the kernel
1017 # from the clean source tree, the GCC plugins do not exist at this point.
1018
1019 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1020 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1021 KBUILD_AFLAGS   += $(KAFLAGS)
1022 KBUILD_CFLAGS   += $(KCFLAGS)
1023 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1024
1025 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1026 LDFLAGS_vmlinux += --build-id=sha1
1027
1028 KBUILD_LDFLAGS  += -z noexecstack
1029 ifeq ($(CONFIG_LD_IS_BFD),y)
1030 KBUILD_LDFLAGS  += $(call ld-option,--no-warn-rwx-segments)
1031 endif
1032
1033 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1034 LDFLAGS_vmlinux += -X
1035 endif
1036
1037 ifeq ($(CONFIG_RELR),y)
1038 # ld.lld before 15 did not support -z pack-relative-relocs.
1039 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1040 endif
1041
1042 # We never want expected sections to be placed heuristically by the
1043 # linker. All sections should be explicitly named in the linker script.
1044 ifdef CONFIG_LD_ORPHAN_WARN
1045 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1046 endif
1047
1048 # Align the bit size of userspace programs with the kernel
1049 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1050 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1051
1052 # make the checker run with the right architecture
1053 CHECKFLAGS += --arch=$(ARCH)
1054
1055 # insure the checker run with the right endianness
1056 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1057
1058 # the checker needs the correct machine size
1059 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1060
1061 # Default kernel image to build when no specific target is given.
1062 # KBUILD_IMAGE may be overruled on the command line or
1063 # set in the environment
1064 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1065 # this default value
1066 export KBUILD_IMAGE ?= vmlinux
1067
1068 #
1069 # INSTALL_PATH specifies where to place the updated kernel and system map
1070 # images. Default is /boot, but you can set it to other values
1071 export  INSTALL_PATH ?= /boot
1072
1073 #
1074 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1075 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1076 # an argument if needed. Otherwise it defaults to the kernel install path
1077 #
1078 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1079
1080 #
1081 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1082 # relocations required by build roots.  This is not defined in the
1083 # makefile but the argument can be passed to make if needed.
1084 #
1085
1086 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1087 export MODLIB
1088
1089 PHONY += prepare0
1090
1091 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1092 export MODORDER := $(extmod_prefix)modules.order
1093 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1094
1095 ifeq ($(KBUILD_EXTMOD),)
1096
1097 build-dir       := .
1098 clean-dirs      := $(sort . Documentation \
1099                      $(patsubst %/,%,$(filter %/, $(core-) \
1100                         $(drivers-) $(libs-))))
1101
1102 export ARCH_CORE        := $(core-y)
1103 export ARCH_LIB         := $(filter %/, $(libs-y))
1104 export ARCH_DRIVERS     := $(drivers-y) $(drivers-m)
1105 # Externally visible symbols (used by link-vmlinux.sh)
1106
1107 KBUILD_VMLINUX_OBJS := ./built-in.a
1108 ifdef CONFIG_MODULES
1109 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1110 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1111 else
1112 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1113 endif
1114
1115 export KBUILD_VMLINUX_LIBS
1116 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1117
1118 ifdef CONFIG_TRIM_UNUSED_KSYMS
1119 # For the kernel to actually contain only the needed exported symbols,
1120 # we have to build modules as well to determine what those symbols are.
1121 KBUILD_MODULES := 1
1122 endif
1123
1124 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1125 quiet_cmd_ar_vmlinux.a = AR      $@
1126       cmd_ar_vmlinux.a = \
1127         rm -f $@; \
1128         $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1129         $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1130
1131 targets += vmlinux.a
1132 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1133         $(call if_changed,ar_vmlinux.a)
1134
1135 PHONY += vmlinux_o
1136 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1137         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1138
1139 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1140         @:
1141
1142 PHONY += vmlinux
1143 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1144 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1145 # unrelated; the decompressors just happen to have the same base name,
1146 # arch/*/boot/compressed/vmlinux.
1147 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1148 #
1149 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1150 #   https://savannah.gnu.org/bugs/?61463
1151 # For Make > 4.4, the following simple code will work:
1152 #  vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1153 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1154 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1155 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1156         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1157
1158 # The actual objects are generated when descending,
1159 # make sure no implicit rule kicks in
1160 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1161
1162 ifeq ($(origin KERNELRELEASE),file)
1163 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1164 else
1165 filechk_kernel.release = echo $(KERNELRELEASE)
1166 endif
1167
1168 # Store (new) KERNELRELEASE string in include/config/kernel.release
1169 include/config/kernel.release: FORCE
1170         $(call filechk,kernel.release)
1171
1172 # Additional helpers built in scripts/
1173 # Carefully list dependencies so we do not try to build scripts twice
1174 # in parallel
1175 PHONY += scripts
1176 scripts: scripts_basic scripts_dtc
1177         $(Q)$(MAKE) $(build)=$(@)
1178
1179 # Things we need to do before we recursively start building the kernel
1180 # or the modules are listed in "prepare".
1181 # A multi level approach is used. prepareN is processed before prepareN-1.
1182 # archprepare is used in arch Makefiles and when processed asm symlink,
1183 # version.h and scripts_basic is processed / created.
1184
1185 PHONY += prepare archprepare
1186
1187 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1188         asm-generic $(version_h) include/generated/utsrelease.h \
1189         include/generated/compile.h include/generated/autoconf.h remove-stale-files
1190
1191 prepare0: archprepare
1192         $(Q)$(MAKE) $(build)=scripts/mod
1193         $(Q)$(MAKE) $(build)=. prepare
1194
1195 # All the preparing..
1196 prepare: prepare0
1197 ifdef CONFIG_RUST
1198         +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1199         $(Q)$(MAKE) $(build)=rust
1200 endif
1201
1202 PHONY += remove-stale-files
1203 remove-stale-files:
1204         $(Q)$(srctree)/scripts/remove-stale-files
1205
1206 # Support for using generic headers in asm-generic
1207 asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj
1208
1209 PHONY += asm-generic uapi-asm-generic
1210 asm-generic: uapi-asm-generic
1211         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1212         generic=include/asm-generic
1213 uapi-asm-generic:
1214         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1215         generic=include/uapi/asm-generic
1216
1217 # Generate some files
1218 # ---------------------------------------------------------------------------
1219
1220 # KERNELRELEASE can change from a few different places, meaning version.h
1221 # needs to be updated, so this check is forced on all builds
1222
1223 uts_len := 64
1224 define filechk_utsrelease.h
1225         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1226           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1227           exit 1;                                                         \
1228         fi;                                                               \
1229         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1230 endef
1231
1232 define filechk_version.h
1233         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1234                 echo \#define LINUX_VERSION_CODE $(shell                 \
1235                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1236         else                                                             \
1237                 echo \#define LINUX_VERSION_CODE $(shell                 \
1238                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1239         fi;                                                              \
1240         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1241         ((c) > 255 ? 255 : (c)))';                                       \
1242         echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1243         echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1244         echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1245 endef
1246
1247 $(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1248 $(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0)
1249 $(version_h): FORCE
1250         $(call filechk,version.h)
1251
1252 include/generated/utsrelease.h: include/config/kernel.release FORCE
1253         $(call filechk,utsrelease.h)
1254
1255 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1256         "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1257
1258 include/generated/compile.h: FORCE
1259         $(call filechk,compile.h)
1260
1261 PHONY += headerdep
1262 headerdep:
1263         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1264         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1265
1266 # ---------------------------------------------------------------------------
1267 # Kernel headers
1268
1269 #Default location for installed headers
1270 export INSTALL_HDR_PATH = $(objtree)/usr
1271
1272 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1273       cmd_headers_install = \
1274         mkdir -p $(INSTALL_HDR_PATH); \
1275         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1276         usr/include $(INSTALL_HDR_PATH)
1277
1278 PHONY += headers_install
1279 headers_install: headers
1280         $(call cmd,headers_install)
1281
1282 PHONY += archheaders archscripts
1283
1284 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1285
1286 PHONY += headers
1287 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1288         $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1289         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1290         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1291
1292 ifdef CONFIG_HEADERS_INSTALL
1293 prepare: headers
1294 endif
1295
1296 PHONY += scripts_unifdef
1297 scripts_unifdef: scripts_basic
1298         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1299
1300 # ---------------------------------------------------------------------------
1301 # Install
1302
1303 # Many distributions have the custom install script, /sbin/installkernel.
1304 # If DKMS is installed, 'make install' will eventually recurse back
1305 # to this Makefile to build and install external modules.
1306 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1307
1308 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1309       cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1310
1311 # ---------------------------------------------------------------------------
1312 # vDSO install
1313
1314 PHONY += vdso_install
1315 vdso_install: export INSTALL_FILES = $(vdso-install-y)
1316 vdso_install:
1317         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
1318
1319 # ---------------------------------------------------------------------------
1320 # Tools
1321
1322 ifdef CONFIG_OBJTOOL
1323 prepare: tools/objtool
1324 endif
1325
1326 ifdef CONFIG_BPF
1327 ifdef CONFIG_DEBUG_INFO_BTF
1328 prepare: tools/bpf/resolve_btfids
1329 endif
1330 endif
1331
1332 # The tools build system is not a part of Kbuild and tends to introduce
1333 # its own unique issues. If you need to integrate a new tool into Kbuild,
1334 # please consider locating that tool outside the tools/ tree and using the
1335 # standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry
1336 # here. See Documentation/kbuild/makefiles.rst for details.
1337
1338 PHONY += resolve_btfids_clean
1339
1340 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1341
1342 # tools/bpf/resolve_btfids directory might not exist
1343 # in output directory, skip its clean in that case
1344 resolve_btfids_clean:
1345 ifneq ($(wildcard $(resolve_btfids_O)),)
1346         $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1347 endif
1348
1349 # Clear a bunch of variables before executing the submake
1350 ifeq ($(quiet),silent_)
1351 tools_silent=s
1352 endif
1353
1354 tools/: FORCE
1355         $(Q)mkdir -p $(objtree)/tools
1356         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1357
1358 tools/%: FORCE
1359         $(Q)mkdir -p $(objtree)/tools
1360         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1361
1362 # ---------------------------------------------------------------------------
1363 # Kernel selftest
1364
1365 PHONY += kselftest
1366 kselftest: headers
1367         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1368
1369 kselftest-%: headers FORCE
1370         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1371
1372 PHONY += kselftest-merge
1373 kselftest-merge:
1374         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1375         $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1376                 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1377         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1378
1379 # ---------------------------------------------------------------------------
1380 # Devicetree files
1381
1382 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1383 dtstree := arch/$(SRCARCH)/boot/dts
1384 endif
1385
1386 ifneq ($(dtstree),)
1387
1388 %.dtb: dtbs_prepare
1389         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1390
1391 %.dtbo: dtbs_prepare
1392         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1393
1394 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1395 dtbs: dtbs_prepare
1396         $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1
1397
1398 # include/config/kernel.release is actually needed when installing DTBs because
1399 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1400 # dtbs_install depend on it as dtbs_install may run as root.
1401 dtbs_prepare: include/config/kernel.release scripts_dtc
1402
1403 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1404 export CHECK_DTBS=y
1405 endif
1406
1407 ifneq ($(CHECK_DTBS),)
1408 dtbs_prepare: dt_binding_schemas
1409 endif
1410
1411 dtbs_check: dtbs
1412
1413 dtbs_install:
1414         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree)
1415
1416 ifdef CONFIG_OF_EARLY_FLATTREE
1417 all: dtbs
1418 endif
1419
1420 endif
1421
1422 PHONY += scripts_dtc
1423 scripts_dtc: scripts_basic
1424         $(Q)$(MAKE) $(build)=scripts/dtc
1425
1426 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1427 export CHECK_DTBS=y
1428 endif
1429
1430 PHONY += dt_binding_check dt_binding_schemas
1431 dt_binding_check: dt_binding_schemas scripts_dtc
1432         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1433
1434 dt_binding_schemas:
1435         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1436
1437 PHONY += dt_compatible_check
1438 dt_compatible_check: dt_binding_schemas
1439         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1440
1441 # ---------------------------------------------------------------------------
1442 # Modules
1443
1444 ifdef CONFIG_MODULES
1445
1446 # By default, build modules as well
1447
1448 all: modules
1449
1450 # When we're building modules with modversions, we need to consider
1451 # the built-in objects during the descend as well, in order to
1452 # make sure the checksums are up to date before we record them.
1453 ifdef CONFIG_MODVERSIONS
1454   KBUILD_BUILTIN := 1
1455 endif
1456
1457 # Build modules
1458 #
1459
1460 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1461 # is an exception.
1462 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1463 KBUILD_BUILTIN := 1
1464 modules: vmlinux
1465 endif
1466
1467 modules: modules_prepare
1468
1469 # Target to prepare building external modules
1470 modules_prepare: prepare
1471         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1472
1473 endif # CONFIG_MODULES
1474
1475 ###
1476 # Cleaning is done on three levels.
1477 # make clean     Delete most generated files
1478 #                Leave enough to build external modules
1479 # make mrproper  Delete the current configuration, and all generated files
1480 # make distclean Remove editor backup files, patch leftover files and the like
1481
1482 # Directories & files removed with 'make clean'
1483 CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1484                modules.builtin modules.builtin.modinfo modules.nsdeps \
1485                compile_commands.json rust/test \
1486                rust-project.json .vmlinux.objs .vmlinux.export.c
1487
1488 # Directories & files removed with 'make mrproper'
1489 MRPROPER_FILES += include/config include/generated          \
1490                   arch/$(SRCARCH)/include/generated .objdiff \
1491                   debian snap tar-install PKGBUILD pacman \
1492                   .config .config.old .version \
1493                   Module.symvers \
1494                   certs/signing_key.pem \
1495                   certs/x509.genkey \
1496                   vmlinux-gdb.py \
1497                   rpmbuild \
1498                   rust/libmacros.so
1499
1500 # clean - Delete most, but leave enough to build external modules
1501 #
1502 clean: private rm-files := $(CLEAN_FILES)
1503
1504 PHONY += archclean vmlinuxclean
1505
1506 vmlinuxclean:
1507         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1508         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1509
1510 clean: archclean vmlinuxclean resolve_btfids_clean
1511
1512 # mrproper - Delete all generated files, including .config
1513 #
1514 mrproper: private rm-files := $(MRPROPER_FILES)
1515 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1516
1517 PHONY += $(mrproper-dirs) mrproper
1518 $(mrproper-dirs):
1519         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1520
1521 mrproper: clean $(mrproper-dirs)
1522         $(call cmd,rmfiles)
1523         @find . $(RCS_FIND_IGNORE) \
1524                 \( -name '*.rmeta' \) \
1525                 -type f -print | xargs rm -f
1526
1527 # distclean
1528 #
1529 PHONY += distclean
1530
1531 distclean: mrproper
1532         @find . $(RCS_FIND_IGNORE) \
1533                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1534                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1535                 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1536                 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1537                 -type f -print | xargs rm -f
1538
1539
1540 # Packaging of the kernel to various formats
1541 # ---------------------------------------------------------------------------
1542
1543 %src-pkg: FORCE
1544         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1545 %pkg: include/config/kernel.release FORCE
1546         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1547
1548 # Brief documentation of the typical targets used
1549 # ---------------------------------------------------------------------------
1550
1551 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1552 boards := $(sort $(notdir $(boards)))
1553 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1554 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1555
1556 PHONY += help
1557 help:
1558         @echo  'Cleaning targets:'
1559         @echo  '  clean           - Remove most generated files but keep the config and'
1560         @echo  '                    enough build support to build external modules'
1561         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1562         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1563         @echo  ''
1564         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1565         @echo  ''
1566         @echo  'Other generic targets:'
1567         @echo  '  all             - Build all targets marked with [*]'
1568         @echo  '* vmlinux         - Build the bare kernel'
1569         @echo  '* modules         - Build all modules'
1570         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1571         @echo  '  vdso_install    - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1572         @echo  '  dir/            - Build all files in dir and below'
1573         @echo  '  dir/file.[ois]  - Build specified target only'
1574         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1575         @echo  '                    (requires compiler support for LLVM assembly generation)'
1576         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1577         @echo  '                    (requires a recent binutils and recent build (System.map))'
1578         @echo  '  dir/file.ko     - Build module including final link'
1579         @echo  '  modules_prepare - Set up for building external modules'
1580         @echo  '  tags/TAGS       - Generate tags file for editors'
1581         @echo  '  cscope          - Generate cscope index'
1582         @echo  '  gtags           - Generate GNU GLOBAL index'
1583         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1584         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1585         @echo  '  image_name      - Output the image name (use with make -s)'
1586         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1587          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1588          echo  ''
1589         @echo  'Static analysers:'
1590         @echo  '  checkstack      - Generate a list of stack hogs and consider all functions'
1591         @echo  '                    with a stack size larger than MINSTACKSIZE (default: 100)'
1592         @echo  '  versioncheck    - Sanity check on version.h usage'
1593         @echo  '  includecheck    - Check for duplicate included header files'
1594         @echo  '  export_report   - List the usages of all exported symbols'
1595         @echo  '  headerdep       - Detect inclusion cycles in headers'
1596         @echo  '  coccicheck      - Check with Coccinelle'
1597         @echo  '  clang-analyzer  - Check with clang static analyzer'
1598         @echo  '  clang-tidy      - Check with clang-tidy'
1599         @echo  ''
1600         @echo  'Tools:'
1601         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1602         @echo  ''
1603         @echo  'Kernel selftest:'
1604         @echo  '  kselftest         - Build and run kernel selftest'
1605         @echo  '                      Build, install, and boot kernel before'
1606         @echo  '                      running kselftest on it'
1607         @echo  '                      Run as root for full coverage'
1608         @echo  '  kselftest-all     - Build kernel selftest'
1609         @echo  '  kselftest-install - Build and install kernel selftest'
1610         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1611         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1612         @echo  '                      kselftest to existing .config.'
1613         @echo  ''
1614         @echo  'Rust targets:'
1615         @echo  '  rustavailable   - Checks whether the Rust toolchain is'
1616         @echo  '                    available and, if not, explains why.'
1617         @echo  '  rustfmt         - Reformat all the Rust code in the kernel'
1618         @echo  '  rustfmtcheck    - Checks if all the Rust code in the kernel'
1619         @echo  '                    is formatted, printing a diff otherwise.'
1620         @echo  '  rustdoc         - Generate Rust documentation'
1621         @echo  '                    (requires kernel .config)'
1622         @echo  '  rusttest        - Runs the Rust tests'
1623         @echo  '                    (requires kernel .config; downloads external repos)'
1624         @echo  '  rust-analyzer   - Generate rust-project.json rust-analyzer support file'
1625         @echo  '                    (requires kernel .config)'
1626         @echo  '  dir/file.[os]   - Build specified target only'
1627         @echo  '  dir/file.rsi    - Build macro expanded source, similar to C preprocessing.'
1628         @echo  '                    Run with RUSTFMT=n to skip reformatting if needed.'
1629         @echo  '                    The output is not intended to be compilable.'
1630         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1631         @echo  ''
1632         @$(if $(dtstree), \
1633                 echo 'Devicetree:'; \
1634                 echo '* dtbs               - Build device tree blobs for enabled boards'; \
1635                 echo '  dtbs_install       - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1636                 echo '  dt_binding_check   - Validate device tree binding documents and examples'; \
1637                 echo '  dt_binding_schema  - Build processed device tree binding schemas'; \
1638                 echo '  dtbs_check         - Validate device tree source files';\
1639                 echo '')
1640
1641         @echo 'Userspace tools targets:'
1642         @echo '  use "make tools/help"'
1643         @echo '  or  "cd tools; make help"'
1644         @echo  ''
1645         @echo  'Kernel packaging:'
1646         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1647         @echo  ''
1648         @echo  'Documentation targets:'
1649         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1650         @echo  ''
1651         @echo  'Architecture-specific targets ($(SRCARCH)):'
1652         @$(or $(archhelp),\
1653                 echo '  No architecture-specific help defined for $(SRCARCH)')
1654         @echo  ''
1655         @$(if $(boards), \
1656                 $(foreach b, $(boards), \
1657                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1658                 echo '')
1659         @$(if $(board-dirs), \
1660                 $(foreach b, $(board-dirs), \
1661                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1662                 printf "  %-16s - Show all of the above\\n" help-boards; \
1663                 echo '')
1664
1665         @echo  '  make V=n   [targets] 1: verbose build'
1666         @echo  '                       2: give reason for rebuild of target'
1667         @echo  '                       V=1 and V=2 can be combined with V=12'
1668         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1669         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1670         @echo  '                       (sparse by default)'
1671         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1672         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1673         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3,c,e where'
1674         @echo  '                1: warnings which may be relevant and do not occur too often'
1675         @echo  '                2: warnings which occur quite often but may still be relevant'
1676         @echo  '                3: more obscure warnings, can most likely be ignored'
1677         @echo  '                c: extra checks in the configuration stage (Kconfig)'
1678         @echo  '                e: warnings are being treated as errors'
1679         @echo  '                Multiple levels can be combined with W=12 or W=123'
1680         @$(if $(dtstree), \
1681                 echo '  make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1682                 echo '         This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1683                 )
1684         @echo  ''
1685         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1686         @echo  'For further info see the ./README file'
1687
1688
1689 help-board-dirs := $(addprefix help-,$(board-dirs))
1690
1691 help-boards: $(help-board-dirs)
1692
1693 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1694
1695 $(help-board-dirs): help-%:
1696         @echo  'Architecture-specific targets ($(SRCARCH) $*):'
1697         @$(if $(boards-per-dir), \
1698                 $(foreach b, $(boards-per-dir), \
1699                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1700                 echo '')
1701
1702
1703 # Documentation targets
1704 # ---------------------------------------------------------------------------
1705 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1706                linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1707 PHONY += $(DOC_TARGETS)
1708 $(DOC_TARGETS):
1709         $(Q)$(MAKE) $(build)=Documentation $@
1710
1711
1712 # Rust targets
1713 # ---------------------------------------------------------------------------
1714
1715 # "Is Rust available?" target
1716 PHONY += rustavailable
1717 rustavailable:
1718         +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1719
1720 # Documentation target
1721 #
1722 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1723 PHONY += rustdoc
1724 rustdoc: prepare
1725         $(Q)$(MAKE) $(build)=rust $@
1726
1727 # Testing target
1728 PHONY += rusttest
1729 rusttest: prepare
1730         $(Q)$(MAKE) $(build)=rust $@
1731
1732 # Formatting targets
1733 PHONY += rustfmt rustfmtcheck
1734
1735 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1736 #
1737 # We match using absolute paths since `find` does not resolve them
1738 # when matching, which is a problem when e.g. `srctree` is `..`.
1739 # We `grep` afterwards in order to remove the directory entry itself.
1740 rustfmt:
1741         $(Q)find $(abs_srctree) -type f -name '*.rs' \
1742                 -o -path $(abs_srctree)/rust/alloc -prune \
1743                 -o -path $(abs_objtree)/rust/test -prune \
1744                 | grep -Fv $(abs_srctree)/rust/alloc \
1745                 | grep -Fv $(abs_objtree)/rust/test \
1746                 | grep -Fv generated \
1747                 | xargs $(RUSTFMT) $(rustfmt_flags)
1748
1749 rustfmtcheck: rustfmt_flags = --check
1750 rustfmtcheck: rustfmt
1751
1752 # Misc
1753 # ---------------------------------------------------------------------------
1754
1755 PHONY += misc-check
1756 misc-check:
1757         $(Q)$(srctree)/scripts/misc-check
1758
1759 all: misc-check
1760
1761 PHONY += scripts_gdb
1762 scripts_gdb: prepare0
1763         $(Q)$(MAKE) $(build)=scripts/gdb
1764         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1765
1766 ifdef CONFIG_GDB_SCRIPTS
1767 all: scripts_gdb
1768 endif
1769
1770 else # KBUILD_EXTMOD
1771
1772 filechk_kernel.release = echo $(KERNELRELEASE)
1773
1774 ###
1775 # External module support.
1776 # When building external modules the kernel used as basis is considered
1777 # read-only, and no consistency checks are made and the make
1778 # system is not used on the basis kernel. If updates are required
1779 # in the basis kernel ordinary make commands (without M=...) must be used.
1780
1781 # We are always building only modules.
1782 KBUILD_BUILTIN :=
1783 KBUILD_MODULES := 1
1784
1785 build-dir := $(KBUILD_EXTMOD)
1786
1787 compile_commands.json: $(extmod_prefix)compile_commands.json
1788 PHONY += compile_commands.json
1789
1790 clean-dirs := $(KBUILD_EXTMOD)
1791 clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1792         $(KBUILD_EXTMOD)/compile_commands.json
1793
1794 PHONY += prepare
1795 # now expand this into a simple variable to reduce the cost of shell evaluations
1796 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1797 prepare:
1798         @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1799                 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1800                 echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1801                 echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1802         fi
1803
1804 PHONY += help
1805 help:
1806         @echo  '  Building external modules.'
1807         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1808         @echo  ''
1809         @echo  '  modules         - default target, build the module(s)'
1810         @echo  '  modules_install - install the module'
1811         @echo  '  clean           - remove generated files in module directory only'
1812         @echo  '  rust-analyzer   - generate rust-project.json rust-analyzer support file'
1813         @echo  ''
1814
1815 ifndef CONFIG_MODULES
1816 modules modules_install: __external_modules_error
1817 __external_modules_error:
1818         @echo >&2 '***'
1819         @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1820         @echo >&2 '*** You cannot build or install external modules.'
1821         @echo >&2 '***'
1822         @false
1823 endif
1824
1825 endif # KBUILD_EXTMOD
1826
1827 # ---------------------------------------------------------------------------
1828 # Modules
1829
1830 PHONY += modules modules_install modules_sign modules_prepare
1831
1832 modules_install:
1833         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1834         sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1835
1836 ifeq ($(CONFIG_MODULE_SIG),y)
1837 # modules_sign is a subset of modules_install.
1838 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1839 modules_sign: modules_install
1840         @:
1841 else
1842 modules_sign:
1843         @echo >&2 '***'
1844         @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1845         @echo >&2 '***'
1846         @false
1847 endif
1848
1849 ifdef CONFIG_MODULES
1850
1851 $(MODORDER): $(build-dir)
1852         @:
1853
1854 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1855 # This is solely useful to speed up test compiles.
1856 modules: modpost
1857 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1858         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1859 endif
1860
1861 PHONY += modules_check
1862 modules_check: $(MODORDER)
1863         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1864
1865 else # CONFIG_MODULES
1866
1867 modules:
1868         @:
1869
1870 KBUILD_MODULES :=
1871
1872 endif # CONFIG_MODULES
1873
1874 PHONY += modpost
1875 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1876          $(if $(KBUILD_MODULES), modules_check)
1877         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1878
1879 # Single targets
1880 # ---------------------------------------------------------------------------
1881 # To build individual files in subdirectories, you can do like this:
1882 #
1883 #   make foo/bar/baz.s
1884 #
1885 # The supported suffixes for single-target are listed in 'single-targets'
1886 #
1887 # To build only under specific subdirectories, you can do like this:
1888 #
1889 #   make foo/bar/baz/
1890
1891 ifdef single-build
1892
1893 # .ko is special because modpost is needed
1894 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1895 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1896                 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1897
1898 $(single-ko): single_modules
1899         @:
1900 $(single-no-ko): $(build-dir)
1901         @:
1902
1903 # Remove MODORDER when done because it is not the real one.
1904 PHONY += single_modules
1905 single_modules: $(single-no-ko) modules_prepare
1906         $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
1907         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1908 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1909         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1910 endif
1911         $(Q)rm -f $(MODORDER)
1912
1913 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1914
1915 KBUILD_MODULES := 1
1916
1917 endif
1918
1919 # Preset locale variables to speed up the build process. Limit locale
1920 # tweaks to this spot to avoid wrong language settings when running
1921 # make menuconfig etc.
1922 # Error messages still appears in the original language
1923 PHONY += $(build-dir)
1924 $(build-dir): prepare
1925         $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
1926
1927 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1928 PHONY += $(clean-dirs) clean
1929 $(clean-dirs):
1930         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1931
1932 clean: $(clean-dirs)
1933         $(call cmd,rmfiles)
1934         @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1935                 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
1936                 -o -name '*.ko.*' \
1937                 -o -name '*.dtb' -o -name '*.dtbo' \
1938                 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
1939                 -o -name '*.dt.yaml' -o -name 'dtbs-list' \
1940                 -o -name '*.dwo' -o -name '*.lst' \
1941                 -o -name '*.su' -o -name '*.mod' \
1942                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1943                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1944                 -o -name '*.asn1.[ch]' \
1945                 -o -name '*.symtypes' -o -name 'modules.order' \
1946                 -o -name '*.c.[012]*.*' \
1947                 -o -name '*.ll' \
1948                 -o -name '*.gcno' \
1949                 -o -name '*.*.symversions' \) -type f -print \
1950                 -o -name '.tmp_*' -print \
1951                 | xargs rm -rf
1952
1953 # Generate tags for editors
1954 # ---------------------------------------------------------------------------
1955 quiet_cmd_tags = GEN     $@
1956       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1957
1958 tags TAGS cscope gtags: FORCE
1959         $(call cmd,tags)
1960
1961 # Generate rust-project.json (a file that describes the structure of non-Cargo
1962 # Rust projects) for rust-analyzer (an implementation of the Language Server
1963 # Protocol).
1964 PHONY += rust-analyzer
1965 rust-analyzer:
1966         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1967         $(Q)$(MAKE) $(build)=rust $@
1968
1969 # Script to generate missing namespace dependencies
1970 # ---------------------------------------------------------------------------
1971
1972 PHONY += nsdeps
1973 nsdeps: export KBUILD_NSDEPS=1
1974 nsdeps: modules
1975         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1976
1977 # Clang Tooling
1978 # ---------------------------------------------------------------------------
1979
1980 quiet_cmd_gen_compile_commands = GEN     $@
1981       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1982
1983 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1984         $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
1985         $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1986         $(call if_changed,gen_compile_commands)
1987
1988 targets += $(extmod_prefix)compile_commands.json
1989
1990 PHONY += clang-tidy clang-analyzer
1991
1992 ifdef CONFIG_CC_IS_CLANG
1993 quiet_cmd_clang_tools = CHECK   $<
1994       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1995
1996 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1997         $(call cmd,clang_tools)
1998 else
1999 clang-tidy clang-analyzer:
2000         @echo "$@ requires CC=clang" >&2
2001         @false
2002 endif
2003
2004 # Scripts to check various things for consistency
2005 # ---------------------------------------------------------------------------
2006
2007 PHONY += includecheck versioncheck coccicheck export_report
2008
2009 includecheck:
2010         find $(srctree)/* $(RCS_FIND_IGNORE) \
2011                 -name '*.[hcS]' -type f -print | sort \
2012                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2013
2014 versioncheck:
2015         find $(srctree)/* $(RCS_FIND_IGNORE) \
2016                 -name '*.[hcS]' -type f -print | sort \
2017                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2018
2019 coccicheck:
2020         $(Q)$(BASH) $(srctree)/scripts/$@
2021
2022 export_report:
2023         $(PERL) $(srctree)/scripts/export_report.pl
2024
2025 PHONY += checkstack kernelrelease kernelversion image_name
2026
2027 # UML needs a little special treatment here.  It wants to use the host
2028 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
2029 # else wants $(ARCH), including people doing cross-builds, which means
2030 # that $(SUBARCH) doesn't work here.
2031 ifeq ($(ARCH), um)
2032 CHECKSTACK_ARCH := $(SUBARCH)
2033 else
2034 CHECKSTACK_ARCH := $(ARCH)
2035 endif
2036 MINSTACKSIZE    ?= 100
2037 checkstack:
2038         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2039         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE)
2040
2041 kernelrelease:
2042         @$(filechk_kernel.release)
2043
2044 kernelversion:
2045         @echo $(KERNELVERSION)
2046
2047 image_name:
2048         @echo $(KBUILD_IMAGE)
2049
2050 PHONY += run-command
2051 run-command:
2052         $(Q)$(KBUILD_RUN_COMMAND)
2053
2054 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
2055       cmd_rmfiles = rm -rf $(rm-files)
2056
2057 # read saved command lines for existing targets
2058 existing-targets := $(wildcard $(sort $(targets)))
2059
2060 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2061
2062 endif # config-build
2063 endif # mixed-build
2064 endif # need-sub-make
2065
2066 PHONY += FORCE
2067 FORCE:
2068
2069 # Declare the contents of the PHONY variable as phony.  We keep that
2070 # information in a variable so we can use it in if_changed and friends.
2071 .PHONY: $(PHONY)