1 # SPDX-License-Identifier: GPL-2.0 2 VERSION = 6 3 PATCHLEVEL = 0 4 SUBLEVEL = 0 5 EXTRAVERSION = -rc1 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 $(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17 # That's our default target when none is given on the command line 18 PHONY := __all 19 __all: 20 21 # We are using a recursive build, so we need to do a little thinking 22 # to get the ordering right. 23 # 24 # Most importantly: sub-Makefiles should only ever modify files in 25 # their own directory. If in some directory we have a dependency on 26 # a file in another dir (which doesn't happen often, but it's often 27 # unavoidable when linking the built-in.a targets which finally 28 # turn into vmlinux), we will call a sub make in that other dir, and 29 # after that we are sure that everything which is in that other dir 30 # is now up to date. 31 # 32 # The only cases where we need to modify files which have global 33 # effects are thus separated out and done before the recursive 34 # descending is started. They are now explicitly listed as the 35 # prepare rule. 36 37 ifneq ($(sub_make_done),1) 38 39 # Do not use make's built-in rules and variables 40 # (this increases performance and avoids hard-to-debug behaviour) 41 MAKEFLAGS += -rR 42 43 # Avoid funny character set dependencies 44 unexport LC_ALL 45 LC_COLLATE=C 46 LC_NUMERIC=C 47 export LC_COLLATE LC_NUMERIC 48 49 # Avoid interference with shell env settings 50 unexport GREP_OPTIONS 51 52 # Beautify output 53 # --------------------------------------------------------------------------- 54 # 55 # Normally, we echo the whole command before executing it. By making 56 # that echo $($(quiet)$(cmd)), we now have the possibility to set 57 # $(quiet) to choose other forms of output instead, e.g. 58 # 59 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61 # 62 # If $(quiet) is empty, the whole command will be printed. 63 # If it is set to "quiet_", only the short version will be printed. 64 # If it is set to "silent_", nothing will be printed at all, since 65 # the variable $(silent_cmd_cc_o_c) doesn't exist. 66 # 67 # A simple variant is to prefix commands with $(Q) - that's useful 68 # for commands that shall be hidden in non-verbose mode. 69 # 70 # $(Q)ln $@ :< 71 # 72 # If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73 # If KBUILD_VERBOSE equals 1 then the above command is displayed. 74 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75 # 76 # To put more focus on warnings, be less verbose as default 77 # Use 'make V=1' to see the full commands 78 79 ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81 endif 82 ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84 endif 85 86 ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89 else 90 quiet=quiet_ 91 Q = @ 92 endif 93 94 # If the user is running make -s (silent mode), suppress echoing of 95 # commands 96 97 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99 KBUILD_VERBOSE = 0 100 endif 101 102 export quiet Q KBUILD_VERBOSE 103 104 # Call a source code checker (by default, "sparse") as part of the 105 # C compilation. 106 # 107 # Use 'make C=1' to enable checking of only re-compiled files. 108 # Use 'make C=2' to enable checking of *all* source files, regardless 109 # of whether they are re-compiled or not. 110 # 111 # See the file "Documentation/dev-tools/sparse.rst" for more details, 112 # including where to get the "sparse" utility. 113 114 ifeq ("$(origin C)", "command line") 115 KBUILD_CHECKSRC = $(C) 116 endif 117 ifndef KBUILD_CHECKSRC 118 KBUILD_CHECKSRC = 0 119 endif 120 121 export KBUILD_CHECKSRC 122 123 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 124 # directory of external module to build. Setting M= takes precedence. 125 ifeq ("$(origin M)", "command line") 126 KBUILD_EXTMOD := $(M) 127 endif 128 129 $(if $(word 2, $(KBUILD_EXTMOD)), \ 130 $(error building multiple external modules is not supported)) 131 132 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 133 $(error module directory path cannot contain '$x'))) 134 135 # Remove trailing slashes 136 ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 137 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 138 endif 139 140 export KBUILD_EXTMOD 141 142 # Kbuild will save output files in the current working directory. 143 # This does not need to match to the root of the kernel source tree. 144 # 145 # For example, you can do this: 146 # 147 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 148 # 149 # If you want to save output files in a different location, there are 150 # two syntaxes to specify it. 151 # 152 # 1) O= 153 # Use "make O=dir/to/store/output/files/" 154 # 155 # 2) Set KBUILD_OUTPUT 156 # Set the environment variable KBUILD_OUTPUT to point to the output directory. 157 # export KBUILD_OUTPUT=dir/to/store/output/files/; make 158 # 159 # The O= assignment takes precedence over the KBUILD_OUTPUT environment 160 # variable. 161 162 # Do we want to change the working directory? 163 ifeq ("$(origin O)", "command line") 164 KBUILD_OUTPUT := $(O) 165 endif 166 167 ifneq ($(KBUILD_OUTPUT),) 168 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 169 # expand a shell special character '~'. We use a somewhat tedious way here. 170 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 171 $(if $(abs_objtree),, \ 172 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 173 174 # $(realpath ...) resolves symlinks 175 abs_objtree := $(realpath $(abs_objtree)) 176 else 177 abs_objtree := $(CURDIR) 178 endif # ifneq ($(KBUILD_OUTPUT),) 179 180 ifeq ($(abs_objtree),$(CURDIR)) 181 # Suppress "Entering directory ..." unless we are changing the work directory. 182 MAKEFLAGS += --no-print-directory 183 else 184 need-sub-make := 1 185 endif 186 187 this-makefile := $(lastword $(MAKEFILE_LIST)) 188 abs_srctree := $(realpath $(dir $(this-makefile))) 189 190 ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 191 $(error source directory cannot contain spaces or colons) 192 endif 193 194 ifneq ($(abs_srctree),$(abs_objtree)) 195 # Look for make include files relative to root of kernel src 196 # 197 # --included-dir is added for backward compatibility, but you should not rely on 198 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree. 199 MAKEFLAGS += --include-dir=$(abs_srctree) 200 endif 201 202 ifneq ($(filter 3.%,$(MAKE_VERSION)),) 203 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 204 # We need to invoke sub-make to avoid implicit rules in the top Makefile. 205 need-sub-make := 1 206 # Cancel implicit rules for this Makefile. 207 $(this-makefile): ; 208 endif 209 210 export abs_srctree abs_objtree 211 export sub_make_done := 1 212 213 ifeq ($(need-sub-make),1) 214 215 PHONY += $(MAKECMDGOALS) __sub-make 216 217 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 218 @: 219 220 # Invoke a second make in the output directory, passing relevant variables 221 __sub-make: 222 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 223 224 endif # need-sub-make 225 endif # sub_make_done 226 227 # We process the rest of the Makefile if this is the final invocation of make 228 ifeq ($(need-sub-make),) 229 230 # Do not print "Entering directory ...", 231 # but we want to display it when entering to the output directory 232 # so that IDEs/editors are able to understand relative filenames. 233 MAKEFLAGS += --no-print-directory 234 235 ifeq ($(abs_srctree),$(abs_objtree)) 236 # building in the source tree 237 srctree := . 238 building_out_of_srctree := 239 else 240 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 241 # building in a subdirectory of the source tree 242 srctree := .. 243 else 244 srctree := $(abs_srctree) 245 endif 246 building_out_of_srctree := 1 247 endif 248 249 ifneq ($(KBUILD_ABS_SRCTREE),) 250 srctree := $(abs_srctree) 251 endif 252 253 objtree := . 254 VPATH := $(srctree) 255 256 export building_out_of_srctree srctree objtree VPATH 257 258 # To make sure we do not include .config for any of the *config targets 259 # catch them early, and hand them over to scripts/kconfig/Makefile 260 # It is allowed to specify more targets when calling make, including 261 # mixing *config targets and build targets. 262 # For example 'make oldconfig all'. 263 # Detect when mixed targets is specified, and make a second invocation 264 # of make so .config is not included in this case either (for *config). 265 266 version_h := include/generated/uapi/linux/version.h 267 268 clean-targets := %clean mrproper cleandocs 269 no-dot-config-targets := $(clean-targets) \ 270 cscope gtags TAGS tags help% %docs check% coccicheck \ 271 $(version_h) headers headers_% archheaders archscripts \ 272 %asm-generic kernelversion %src-pkg dt_binding_check \ 273 outputmakefile 274 # Installation targets should not require compiler. Unfortunately, vdso_install 275 # is an exception where build artifacts may be updated. This must be fixed. 276 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 277 headers_install modules_install kernelrelease image_name 278 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 279 image_name 280 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 281 282 config-build := 283 mixed-build := 284 need-config := 1 285 need-compiler := 1 286 may-sync-config := 1 287 single-build := 288 289 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 290 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 291 need-config := 292 endif 293 endif 294 295 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 296 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 297 need-compiler := 298 endif 299 endif 300 301 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 302 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 303 may-sync-config := 304 endif 305 endif 306 307 ifneq ($(KBUILD_EXTMOD),) 308 may-sync-config := 309 endif 310 311 ifeq ($(KBUILD_EXTMOD),) 312 ifneq ($(filter %config,$(MAKECMDGOALS)),) 313 config-build := 1 314 ifneq ($(words $(MAKECMDGOALS)),1) 315 mixed-build := 1 316 endif 317 endif 318 endif 319 320 # We cannot build single targets and the others at the same time 321 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 322 single-build := 1 323 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 324 mixed-build := 1 325 endif 326 endif 327 328 # For "make -j clean all", "make -j mrproper defconfig all", etc. 329 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 330 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 331 mixed-build := 1 332 endif 333 endif 334 335 # install and modules_install need also be processed one by one 336 ifneq ($(filter install,$(MAKECMDGOALS)),) 337 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 338 mixed-build := 1 339 endif 340 endif 341 342 ifdef mixed-build 343 # =========================================================================== 344 # We're called with mixed targets (*config and build targets). 345 # Handle them one by one. 346 347 PHONY += $(MAKECMDGOALS) __build_one_by_one 348 349 $(MAKECMDGOALS): __build_one_by_one 350 @: 351 352 __build_one_by_one: 353 $(Q)set -e; \ 354 for i in $(MAKECMDGOALS); do \ 355 $(MAKE) -f $(srctree)/Makefile $$i; \ 356 done 357 358 else # !mixed-build 359 360 include $(srctree)/scripts/Kbuild.include 361 362 # Read KERNELRELEASE from include/config/kernel.release (if it exists) 363 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 364 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 365 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 366 367 include $(srctree)/scripts/subarch.include 368 369 # Cross compiling and selecting different set of gcc/bin-utils 370 # --------------------------------------------------------------------------- 371 # 372 # When performing cross compilation for other architectures ARCH shall be set 373 # to the target architecture. (See arch/* for the possibilities). 374 # ARCH can be set during invocation of make: 375 # make ARCH=ia64 376 # Another way is to have ARCH set in the environment. 377 # The default ARCH is the host where make is executed. 378 379 # CROSS_COMPILE specify the prefix used for all executables used 380 # during compilation. Only gcc and related bin-utils executables 381 # are prefixed with $(CROSS_COMPILE). 382 # CROSS_COMPILE can be set on the command line 383 # make CROSS_COMPILE=ia64-linux- 384 # Alternatively CROSS_COMPILE can be set in the environment. 385 # Default value for CROSS_COMPILE is not to prefix executables 386 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 387 ARCH ?= $(SUBARCH) 388 389 # Architecture as present in compile.h 390 UTS_MACHINE := $(ARCH) 391 SRCARCH := $(ARCH) 392 393 # Additional ARCH settings for x86 394 ifeq ($(ARCH),i386) 395 SRCARCH := x86 396 endif 397 ifeq ($(ARCH),x86_64) 398 SRCARCH := x86 399 endif 400 401 # Additional ARCH settings for sparc 402 ifeq ($(ARCH),sparc32) 403 SRCARCH := sparc 404 endif 405 ifeq ($(ARCH),sparc64) 406 SRCARCH := sparc 407 endif 408 409 # Additional ARCH settings for parisc 410 ifeq ($(ARCH),parisc64) 411 SRCARCH := parisc 412 endif 413 414 export cross_compiling := 415 ifneq ($(SRCARCH),$(SUBARCH)) 416 cross_compiling := 1 417 endif 418 419 KCONFIG_CONFIG ?= .config 420 export KCONFIG_CONFIG 421 422 # SHELL used by kbuild 423 CONFIG_SHELL := sh 424 425 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 426 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 427 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 428 429 ifneq ($(LLVM),) 430 ifneq ($(filter %/,$(LLVM)),) 431 LLVM_PREFIX := $(LLVM) 432 else ifneq ($(filter -%,$(LLVM)),) 433 LLVM_SUFFIX := $(LLVM) 434 endif 435 436 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 437 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 438 else 439 HOSTCC = gcc 440 HOSTCXX = g++ 441 endif 442 HOSTPKG_CONFIG = pkg-config 443 444 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 445 -O2 -fomit-frame-pointer -std=gnu11 \ 446 -Wdeclaration-after-statement 447 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 448 KBUILD_USERLDFLAGS := $(USERLDFLAGS) 449 450 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 451 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 452 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 453 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 454 455 # Make variables (CC, etc...) 456 CPP = $(CC) -E 457 ifneq ($(LLVM),) 458 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 459 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 460 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 461 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 462 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 463 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 464 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 465 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 466 else 467 CC = $(CROSS_COMPILE)gcc 468 LD = $(CROSS_COMPILE)ld 469 AR = $(CROSS_COMPILE)ar 470 NM = $(CROSS_COMPILE)nm 471 OBJCOPY = $(CROSS_COMPILE)objcopy 472 OBJDUMP = $(CROSS_COMPILE)objdump 473 READELF = $(CROSS_COMPILE)readelf 474 STRIP = $(CROSS_COMPILE)strip 475 endif 476 PAHOLE = pahole 477 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 478 LEX = flex 479 YACC = bison 480 AWK = awk 481 INSTALLKERNEL := installkernel 482 DEPMOD = depmod 483 PERL = perl 484 PYTHON3 = python3 485 CHECK = sparse 486 BASH = bash 487 KGZIP = gzip 488 KBZIP2 = bzip2 489 KLZOP = lzop 490 LZMA = lzma 491 LZ4 = lz4c 492 XZ = xz 493 ZSTD = zstd 494 495 PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 496 497 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 498 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 499 NOSTDINC_FLAGS := 500 CFLAGS_MODULE = 501 AFLAGS_MODULE = 502 LDFLAGS_MODULE = 503 CFLAGS_KERNEL = 504 AFLAGS_KERNEL = 505 LDFLAGS_vmlinux = 506 507 # Use USERINCLUDE when you must reference the UAPI directories only. 508 USERINCLUDE := \ 509 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 510 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 511 -I$(srctree)/include/uapi \ 512 -I$(objtree)/include/generated/uapi \ 513 -include $(srctree)/include/linux/compiler-version.h \ 514 -include $(srctree)/include/linux/kconfig.h 515 516 # Use LINUXINCLUDE when you must reference the include/ directory. 517 # Needed to be compatible with the O= option 518 LINUXINCLUDE := \ 519 -I$(srctree)/arch/$(SRCARCH)/include \ 520 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 521 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 522 -I$(objtree)/include \ 523 $(USERINCLUDE) 524 525 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 526 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 527 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 528 -Werror=implicit-function-declaration -Werror=implicit-int \ 529 -Werror=return-type -Wno-format-security \ 530 -std=gnu11 531 KBUILD_CPPFLAGS := -D__KERNEL__ 532 KBUILD_AFLAGS_KERNEL := 533 KBUILD_CFLAGS_KERNEL := 534 KBUILD_AFLAGS_MODULE := -DMODULE 535 KBUILD_CFLAGS_MODULE := -DMODULE 536 KBUILD_LDFLAGS_MODULE := 537 KBUILD_LDFLAGS := 538 CLANG_FLAGS := 539 540 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 541 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 542 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 543 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 544 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 545 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 546 547 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 548 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 549 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 550 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 551 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 552 export PAHOLE_FLAGS 553 554 # Files to ignore in find ... statements 555 556 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 557 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 558 -prune -o 559 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 560 --exclude CVS --exclude .pc --exclude .hg --exclude .git 561 562 # =========================================================================== 563 # Rules shared between *config targets and build targets 564 565 # Basic helpers built in scripts/basic/ 566 PHONY += scripts_basic 567 scripts_basic: 568 $(Q)$(MAKE) $(build)=scripts/basic 569 570 PHONY += outputmakefile 571 ifdef building_out_of_srctree 572 # Before starting out-of-tree build, make sure the source tree is clean. 573 # outputmakefile generates a Makefile in the output directory, if using a 574 # separate output directory. This allows convenient use of make in the 575 # output directory. 576 # At the same time when output Makefile generated, generate .gitignore to 577 # ignore whole output directory 578 579 quiet_cmd_makefile = GEN Makefile 580 cmd_makefile = { \ 581 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 582 echo "include $(srctree)/Makefile"; \ 583 } > Makefile 584 585 outputmakefile: 586 $(Q)if [ -f $(srctree)/.config -o \ 587 -d $(srctree)/include/config -o \ 588 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 589 echo >&2 "***"; \ 590 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 591 echo >&2 "*** in $(abs_srctree)";\ 592 echo >&2 "***"; \ 593 false; \ 594 fi 595 $(Q)ln -fsn $(srctree) source 596 $(call cmd,makefile) 597 $(Q)test -e .gitignore || \ 598 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 599 endif 600 601 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 602 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 603 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 604 # and from include/config/auto.conf.cmd to detect the compiler upgrade. 605 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 606 607 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 608 include $(srctree)/scripts/Makefile.clang 609 endif 610 611 # Include this also for config targets because some architectures need 612 # cc-cross-prefix to determine CROSS_COMPILE. 613 ifdef need-compiler 614 include $(srctree)/scripts/Makefile.compiler 615 endif 616 617 ifdef config-build 618 # =========================================================================== 619 # *config targets only - make sure prerequisites are updated, and descend 620 # in scripts/kconfig to make the *config target 621 622 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 623 # KBUILD_DEFCONFIG may point out an alternative default configuration 624 # used for 'make defconfig' 625 include $(srctree)/arch/$(SRCARCH)/Makefile 626 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 627 628 config: outputmakefile scripts_basic FORCE 629 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 630 631 %config: outputmakefile scripts_basic FORCE 632 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 633 634 else #!config-build 635 # =========================================================================== 636 # Build targets only - this includes vmlinux, arch specific targets, clean 637 # targets and others. In general all targets except *config targets. 638 639 # If building an external module we do not care about the all: rule 640 # but instead __all depend on modules 641 PHONY += all 642 ifeq ($(KBUILD_EXTMOD),) 643 __all: all 644 else 645 __all: modules 646 endif 647 648 # Decide whether to build built-in, modular, or both. 649 # Normally, just do built-in. 650 651 KBUILD_MODULES := 652 KBUILD_BUILTIN := 1 653 654 # If we have only "make modules", don't compile built-in objects. 655 ifeq ($(MAKECMDGOALS),modules) 656 KBUILD_BUILTIN := 657 endif 658 659 # If we have "make <whatever> modules", compile modules 660 # in addition to whatever we do anyway. 661 # Just "make" or "make all" shall build modules as well 662 663 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 664 KBUILD_MODULES := 1 665 endif 666 667 ifeq ($(MAKECMDGOALS),) 668 KBUILD_MODULES := 1 669 endif 670 671 export KBUILD_MODULES KBUILD_BUILTIN 672 673 ifdef need-config 674 include include/config/auto.conf 675 endif 676 677 ifeq ($(KBUILD_EXTMOD),) 678 # Objects we will link into vmlinux / subdirs we need to visit 679 core-y := init/ usr/ arch/$(SRCARCH)/ 680 drivers-y := drivers/ sound/ 681 drivers-$(CONFIG_SAMPLES) += samples/ 682 drivers-$(CONFIG_NET) += net/ 683 drivers-y += virt/ 684 libs-y := lib/ 685 endif # KBUILD_EXTMOD 686 687 # The all: target is the default when no target is given on the 688 # command line. 689 # This allow a user to issue only 'make' to build a kernel including modules 690 # Defaults to vmlinux, but the arch makefile usually adds further targets 691 all: vmlinux 692 693 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 694 ifdef CONFIG_CC_IS_GCC 695 CFLAGS_GCOV += -fno-tree-loop-im 696 endif 697 export CFLAGS_GCOV 698 699 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 700 ifdef CONFIG_FUNCTION_TRACER 701 CC_FLAGS_FTRACE := -pg 702 endif 703 704 include $(srctree)/arch/$(SRCARCH)/Makefile 705 706 ifdef need-config 707 ifdef may-sync-config 708 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if 709 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile 710 # because some architectures define CROSS_COMPILE there. 711 include include/config/auto.conf.cmd 712 713 $(KCONFIG_CONFIG): 714 @echo >&2 '***' 715 @echo >&2 '*** Configuration file "$@" not found!' 716 @echo >&2 '***' 717 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 718 @echo >&2 '*** "make menuconfig" or "make xconfig").' 719 @echo >&2 '***' 720 @/bin/false 721 722 # The actual configuration files used during the build are stored in 723 # include/generated/ and include/config/. Update them if .config is newer than 724 # include/config/auto.conf (which mirrors .config). 725 # 726 # This exploits the 'multi-target pattern rule' trick. 727 # The syncconfig should be executed only once to make all the targets. 728 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 729 # 730 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 731 # so you cannot notice that Kconfig is waiting for the user input. 732 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 733 $(Q)$(kecho) " SYNC $@" 734 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 735 else # !may-sync-config 736 # External modules and some install targets need include/generated/autoconf.h 737 # and include/config/auto.conf but do not care if they are up-to-date. 738 # Use auto.conf to trigger the test 739 PHONY += include/config/auto.conf 740 741 include/config/auto.conf: 742 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 743 echo >&2; \ 744 echo >&2 " ERROR: Kernel configuration is invalid."; \ 745 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 746 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 747 echo >&2 ; \ 748 /bin/false) 749 750 endif # may-sync-config 751 endif # need-config 752 753 KBUILD_CFLAGS += -fno-delete-null-pointer-checks 754 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 755 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 756 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 757 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 758 759 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 760 KBUILD_CFLAGS += -O2 761 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 762 KBUILD_CFLAGS += -Os 763 endif 764 765 # Tell gcc to never replace conditional load with a non-conditional one 766 ifdef CONFIG_CC_IS_GCC 767 # gcc-10 renamed --param=allow-store-data-races=0 to 768 # -fno-allow-store-data-races. 769 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 770 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 771 endif 772 773 ifdef CONFIG_READABLE_ASM 774 # Disable optimizations that make assembler listings hard to read. 775 # reorder blocks reorders the control in the function 776 # ipa clone creates specialized cloned functions 777 # partial inlining inlines only parts of functions 778 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 779 endif 780 781 ifneq ($(CONFIG_FRAME_WARN),0) 782 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 783 endif 784 785 stackp-flags-y := -fno-stack-protector 786 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 787 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 788 789 KBUILD_CFLAGS += $(stackp-flags-y) 790 791 KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror 792 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds 793 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 794 795 ifdef CONFIG_CC_IS_CLANG 796 KBUILD_CPPFLAGS += -Qunused-arguments 797 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 798 KBUILD_CFLAGS += -Wno-gnu 799 else 800 801 # gcc inanely warns about local variables called 'main' 802 KBUILD_CFLAGS += -Wno-main 803 endif 804 805 # These warnings generated too much noise in a regular build. 806 # Use make W=1 to enable them (see scripts/Makefile.extrawarn) 807 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 808 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 809 810 # These result in bogus false positives 811 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 812 813 ifdef CONFIG_FRAME_POINTER 814 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 815 else 816 # Some targets (ARM with Thumb2, for example), can't be built with frame 817 # pointers. For those, we don't have FUNCTION_TRACER automatically 818 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 819 # incompatible with -fomit-frame-pointer with current GCC, so we don't use 820 # -fomit-frame-pointer with FUNCTION_TRACER. 821 ifndef CONFIG_FUNCTION_TRACER 822 KBUILD_CFLAGS += -fomit-frame-pointer 823 endif 824 endif 825 826 # Initialize all stack variables with a 0xAA pattern. 827 ifdef CONFIG_INIT_STACK_ALL_PATTERN 828 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 829 endif 830 831 # Initialize all stack variables with a zero value. 832 ifdef CONFIG_INIT_STACK_ALL_ZERO 833 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 834 ifdef CONFIG_CC_IS_CLANG 835 # https://bugs.llvm.org/show_bug.cgi?id=45497 836 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 837 endif 838 endif 839 840 # While VLAs have been removed, GCC produces unreachable stack probes 841 # for the randomize_kstack_offset feature. Disable it for all compilers. 842 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 843 844 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 845 ifdef CONFIG_ZERO_CALL_USED_REGS 846 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 847 endif 848 849 ifdef CONFIG_FUNCTION_TRACER 850 ifdef CONFIG_FTRACE_MCOUNT_USE_CC 851 CC_FLAGS_FTRACE += -mrecord-mcount 852 ifdef CONFIG_HAVE_NOP_MCOUNT 853 ifeq ($(call cc-option-yn, -mnop-mcount),y) 854 CC_FLAGS_FTRACE += -mnop-mcount 855 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 856 endif 857 endif 858 endif 859 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 860 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 861 endif 862 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 863 ifdef CONFIG_HAVE_C_RECORDMCOUNT 864 BUILD_C_RECORDMCOUNT := y 865 export BUILD_C_RECORDMCOUNT 866 endif 867 endif 868 ifdef CONFIG_HAVE_FENTRY 869 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 870 ifeq ($(call cc-option-yn, -mfentry),y) 871 CC_FLAGS_FTRACE += -mfentry 872 CC_FLAGS_USING += -DCC_USING_FENTRY 873 endif 874 endif 875 export CC_FLAGS_FTRACE 876 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 877 KBUILD_AFLAGS += $(CC_FLAGS_USING) 878 endif 879 880 # We trigger additional mismatches with less inlining 881 ifdef CONFIG_DEBUG_SECTION_MISMATCH 882 KBUILD_CFLAGS += -fno-inline-functions-called-once 883 endif 884 885 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 886 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 887 LDFLAGS_vmlinux += --gc-sections 888 endif 889 890 ifdef CONFIG_SHADOW_CALL_STACK 891 CC_FLAGS_SCS := -fsanitize=shadow-call-stack 892 KBUILD_CFLAGS += $(CC_FLAGS_SCS) 893 export CC_FLAGS_SCS 894 endif 895 896 ifdef CONFIG_LTO_CLANG 897 ifdef CONFIG_LTO_CLANG_THIN 898 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 899 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 900 else 901 CC_FLAGS_LTO := -flto 902 endif 903 CC_FLAGS_LTO += -fvisibility=hidden 904 905 # Limit inlining across translation units to reduce binary size 906 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 907 908 # Check for frame size exceeding threshold during prolog/epilog insertion 909 # when using lld < 13.0.0. 910 ifneq ($(CONFIG_FRAME_WARN),0) 911 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 912 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 913 endif 914 endif 915 endif 916 917 ifdef CONFIG_LTO 918 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 919 KBUILD_AFLAGS += -fno-lto 920 export CC_FLAGS_LTO 921 endif 922 923 ifdef CONFIG_CFI_CLANG 924 CC_FLAGS_CFI := -fsanitize=cfi \ 925 -fsanitize-cfi-cross-dso \ 926 -fno-sanitize-cfi-canonical-jump-tables \ 927 -fno-sanitize-trap=cfi \ 928 -fno-sanitize-blacklist 929 930 ifdef CONFIG_CFI_PERMISSIVE 931 CC_FLAGS_CFI += -fsanitize-recover=cfi 932 endif 933 934 # If LTO flags are filtered out, we must also filter out CFI. 935 CC_FLAGS_LTO += $(CC_FLAGS_CFI) 936 KBUILD_CFLAGS += $(CC_FLAGS_CFI) 937 export CC_FLAGS_CFI 938 endif 939 940 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 941 KBUILD_CFLAGS += -falign-functions=64 942 endif 943 944 # arch Makefile may override CC so keep this after arch Makefile is included 945 NOSTDINC_FLAGS += -nostdinc 946 947 # warn about C99 declaration after statement 948 KBUILD_CFLAGS += -Wdeclaration-after-statement 949 950 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel 951 KBUILD_CFLAGS += -Wvla 952 953 # disable pointer signed / unsigned warnings in gcc 4.0 954 KBUILD_CFLAGS += -Wno-pointer-sign 955 956 # In order to make sure new function cast mismatches are not introduced 957 # in the kernel (to avoid tripping CFI checking), the kernel should be 958 # globally built with -Wcast-function-type. 959 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 960 961 # disable stringop warnings in gcc 8+ 962 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 963 964 # We'll want to enable this eventually, but it's not going away for 5.7 at least 965 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 966 967 # Another good warning that we'll want to enable eventually 968 KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 969 970 # Enabled with W=2, disabled by default as noisy 971 ifdef CONFIG_CC_IS_GCC 972 KBUILD_CFLAGS += -Wno-maybe-uninitialized 973 endif 974 975 ifdef CONFIG_CC_IS_GCC 976 # The allocators already balk at large sizes, so silence the compiler 977 # warnings for bounds checks involving those possible values. While 978 # -Wno-alloc-size-larger-than would normally be used here, earlier versions 979 # of gcc (<9.1) weirdly don't handle the option correctly when _other_ 980 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 981 # doesn't work (as it is documented to), silently resolving to "0" prior to 982 # version 9.1 (and producing an error more recently). Numeric values larger 983 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 984 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other 985 # choice, we must perform a versioned check to disable this warning. 986 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 987 KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than) 988 endif 989 990 # disable invalid "can't wrap" optimizations for signed / pointers 991 KBUILD_CFLAGS += -fno-strict-overflow 992 993 # Make sure -fstack-check isn't enabled (like gentoo apparently did) 994 KBUILD_CFLAGS += -fno-stack-check 995 996 # conserve stack if available 997 ifdef CONFIG_CC_IS_GCC 998 KBUILD_CFLAGS += -fconserve-stack 999 endif 1000 1001 # Prohibit date/time macros, which would make the build non-deterministic 1002 KBUILD_CFLAGS += -Werror=date-time 1003 1004 # enforce correct pointer usage 1005 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1006 1007 # Require designated initializers for all marked structures 1008 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1009 1010 # change __FILE__ to the relative path from the srctree 1011 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1012 1013 # include additional Makefiles when needed 1014 include-y := scripts/Makefile.extrawarn 1015 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1016 include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1017 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1018 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1019 include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1020 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1021 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1022 1023 include $(addprefix $(srctree)/, $(include-y)) 1024 1025 # scripts/Makefile.gcc-plugins is intentionally included last. 1026 # Do not add $(call cc-option,...) below this line. When you build the kernel 1027 # from the clean source tree, the GCC plugins do not exist at this point. 1028 1029 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1030 KBUILD_CPPFLAGS += $(KCPPFLAGS) 1031 KBUILD_AFLAGS += $(KAFLAGS) 1032 KBUILD_CFLAGS += $(KCFLAGS) 1033 1034 KBUILD_LDFLAGS_MODULE += --build-id=sha1 1035 LDFLAGS_vmlinux += --build-id=sha1 1036 1037 KBUILD_LDFLAGS += -z noexecstack 1038 ifeq ($(CONFIG_LD_IS_BFD),y) 1039 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1040 endif 1041 1042 ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1043 LDFLAGS_vmlinux += $(call ld-option, -X,) 1044 endif 1045 1046 ifeq ($(CONFIG_RELR),y) 1047 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1048 endif 1049 1050 # We never want expected sections to be placed heuristically by the 1051 # linker. All sections should be explicitly named in the linker script. 1052 ifdef CONFIG_LD_ORPHAN_WARN 1053 LDFLAGS_vmlinux += --orphan-handling=warn 1054 endif 1055 1056 # Align the bit size of userspace programs with the kernel 1057 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1058 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1059 1060 # make the checker run with the right architecture 1061 CHECKFLAGS += --arch=$(ARCH) 1062 1063 # insure the checker run with the right endianness 1064 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1065 1066 # the checker needs the correct machine size 1067 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1068 1069 # Default kernel image to build when no specific target is given. 1070 # KBUILD_IMAGE may be overruled on the command line or 1071 # set in the environment 1072 # Also any assignments in arch/$(ARCH)/Makefile take precedence over 1073 # this default value 1074 export KBUILD_IMAGE ?= vmlinux 1075 1076 # 1077 # INSTALL_PATH specifies where to place the updated kernel and system map 1078 # images. Default is /boot, but you can set it to other values 1079 export INSTALL_PATH ?= /boot 1080 1081 # 1082 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1083 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1084 # an argument if needed. Otherwise it defaults to the kernel install path 1085 # 1086 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1087 1088 # 1089 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1090 # relocations required by build roots. This is not defined in the 1091 # makefile but the argument can be passed to make if needed. 1092 # 1093 1094 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1095 export MODLIB 1096 1097 PHONY += prepare0 1098 1099 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1100 export MODORDER := $(extmod_prefix)modules.order 1101 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1102 1103 ifeq ($(KBUILD_EXTMOD),) 1104 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ 1105 core-$(CONFIG_BLOCK) += block/ 1106 core-$(CONFIG_IO_URING) += io_uring/ 1107 1108 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1109 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1110 $(libs-y) $(libs-m))) 1111 1112 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1113 $(patsubst %/,%,$(filter %/, $(core-) \ 1114 $(drivers-) $(libs-)))) 1115 1116 subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1117 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1118 $(drivers-y) $(drivers-m))) 1119 1120 build-dirs := $(vmlinux-dirs) 1121 clean-dirs := $(vmlinux-alldirs) 1122 1123 # Externally visible symbols (used by link-vmlinux.sh) 1124 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1125 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1126 ifdef CONFIG_MODULES 1127 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1128 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1129 else 1130 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1131 endif 1132 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1133 1134 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1135 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1136 # used by scripts/Makefile.package 1137 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1138 1139 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1140 1141 # Recurse until adjust_autoksyms.sh is satisfied 1142 PHONY += autoksyms_recursive 1143 ifdef CONFIG_TRIM_UNUSED_KSYMS 1144 # For the kernel to actually contain only the needed exported symbols, 1145 # we have to build modules as well to determine what those symbols are. 1146 # (this can be evaluated only once include/config/auto.conf has been included) 1147 KBUILD_MODULES := 1 1148 1149 autoksyms_recursive: descend modules.order 1150 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1151 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1152 endif 1153 1154 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1155 1156 quiet_cmd_autoksyms_h = GEN $@ 1157 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1158 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1159 1160 $(autoksyms_h): 1161 $(call cmd,autoksyms_h) 1162 1163 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1164 1165 # Final link of vmlinux with optional arch pass after final link 1166 cmd_link-vmlinux = \ 1167 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1168 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1169 1170 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1171 +$(call if_changed_dep,link-vmlinux) 1172 1173 targets := vmlinux 1174 1175 # The actual objects are generated when descending, 1176 # make sure no implicit rule kicks in 1177 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1178 1179 filechk_kernel.release = \ 1180 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1181 1182 # Store (new) KERNELRELEASE string in include/config/kernel.release 1183 include/config/kernel.release: FORCE 1184 $(call filechk,kernel.release) 1185 1186 # Additional helpers built in scripts/ 1187 # Carefully list dependencies so we do not try to build scripts twice 1188 # in parallel 1189 PHONY += scripts 1190 scripts: scripts_basic scripts_dtc 1191 $(Q)$(MAKE) $(build)=$(@) 1192 1193 # Things we need to do before we recursively start building the kernel 1194 # or the modules are listed in "prepare". 1195 # A multi level approach is used. prepareN is processed before prepareN-1. 1196 # archprepare is used in arch Makefiles and when processed asm symlink, 1197 # version.h and scripts_basic is processed / created. 1198 1199 PHONY += prepare archprepare 1200 1201 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1202 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1203 include/generated/autoconf.h remove-stale-files 1204 1205 prepare0: archprepare 1206 $(Q)$(MAKE) $(build)=scripts/mod 1207 $(Q)$(MAKE) $(build)=. 1208 1209 # All the preparing.. 1210 prepare: prepare0 1211 1212 PHONY += remove-stale-files 1213 remove-stale-files: 1214 $(Q)$(srctree)/scripts/remove-stale-files 1215 1216 # Support for using generic headers in asm-generic 1217 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1218 1219 PHONY += asm-generic uapi-asm-generic 1220 asm-generic: uapi-asm-generic 1221 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1222 generic=include/asm-generic 1223 uapi-asm-generic: 1224 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1225 generic=include/uapi/asm-generic 1226 1227 # Generate some files 1228 # --------------------------------------------------------------------------- 1229 1230 # KERNELRELEASE can change from a few different places, meaning version.h 1231 # needs to be updated, so this check is forced on all builds 1232 1233 uts_len := 64 1234 define filechk_utsrelease.h 1235 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1236 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1237 exit 1; \ 1238 fi; \ 1239 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1240 endef 1241 1242 define filechk_version.h 1243 if [ $(SUBLEVEL) -gt 255 ]; then \ 1244 echo \#define LINUX_VERSION_CODE $(shell \ 1245 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1246 else \ 1247 echo \#define LINUX_VERSION_CODE $(shell \ 1248 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1249 fi; \ 1250 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1251 ((c) > 255 ? 255 : (c)))'; \ 1252 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1253 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1254 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1255 endef 1256 1257 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1258 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1259 $(version_h): FORCE 1260 $(call filechk,version.h) 1261 1262 include/generated/utsrelease.h: include/config/kernel.release FORCE 1263 $(call filechk,utsrelease.h) 1264 1265 PHONY += headerdep 1266 headerdep: 1267 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1268 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1269 1270 # --------------------------------------------------------------------------- 1271 # Kernel headers 1272 1273 #Default location for installed headers 1274 export INSTALL_HDR_PATH = $(objtree)/usr 1275 1276 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1277 cmd_headers_install = \ 1278 mkdir -p $(INSTALL_HDR_PATH); \ 1279 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1280 usr/include $(INSTALL_HDR_PATH) 1281 1282 PHONY += headers_install 1283 headers_install: headers 1284 $(call cmd,headers_install) 1285 1286 PHONY += archheaders archscripts 1287 1288 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1289 1290 PHONY += headers 1291 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1292 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1293 $(error Headers not exportable for the $(SRCARCH) architecture)) 1294 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1295 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1296 1297 ifdef CONFIG_HEADERS_INSTALL 1298 prepare: headers 1299 endif 1300 1301 PHONY += scripts_unifdef 1302 scripts_unifdef: scripts_basic 1303 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1304 1305 # --------------------------------------------------------------------------- 1306 # Install 1307 1308 # Many distributions have the custom install script, /sbin/installkernel. 1309 # If DKMS is installed, 'make install' will eventually recurse back 1310 # to this Makefile to build and install external modules. 1311 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1312 1313 quiet_cmd_install = INSTALL $(INSTALL_PATH) 1314 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 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 | \ 1367 xargs $(srctree)/scripts/kconfig/merge_config.sh -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 dtbs: dt_binding_check 1397 endif 1398 1399 dtbs_check: dtbs 1400 1401 dtbs_install: 1402 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1403 1404 ifdef CONFIG_OF_EARLY_FLATTREE 1405 all: dtbs 1406 endif 1407 1408 endif 1409 1410 PHONY += scripts_dtc 1411 scripts_dtc: scripts_basic 1412 $(Q)$(MAKE) $(build)=scripts/dtc 1413 1414 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1415 export CHECK_DT_BINDING=y 1416 endif 1417 1418 PHONY += dt_binding_check 1419 dt_binding_check: scripts_dtc 1420 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1421 1422 # --------------------------------------------------------------------------- 1423 # Modules 1424 1425 ifdef CONFIG_MODULES 1426 1427 # By default, build modules as well 1428 1429 all: modules 1430 1431 # When we're building modules with modversions, we need to consider 1432 # the built-in objects during the descend as well, in order to 1433 # make sure the checksums are up to date before we record them. 1434 ifdef CONFIG_MODVERSIONS 1435 KBUILD_BUILTIN := 1 1436 endif 1437 1438 # Build modules 1439 # 1440 # A module can be listed more than once in obj-m resulting in 1441 # duplicate lines in modules.order files. Those are removed 1442 # using awk while concatenating to the final file. 1443 1444 PHONY += modules 1445 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1446 1447 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1448 1449 modules.order: $(subdir-modorder) FORCE 1450 $(call if_changed,modules_order) 1451 1452 targets += modules.order 1453 1454 # Target to prepare building external modules 1455 PHONY += modules_prepare 1456 modules_prepare: prepare 1457 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1458 1459 export modules_sign_only := 1460 1461 ifeq ($(CONFIG_MODULE_SIG),y) 1462 PHONY += modules_sign 1463 modules_sign: modules_install 1464 @: 1465 1466 # modules_sign is a subset of modules_install. 1467 # 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1468 ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1469 modules_sign_only := y 1470 endif 1471 endif 1472 1473 modinst_pre := 1474 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1475 modinst_pre := __modinst_pre 1476 endif 1477 1478 modules_install: $(modinst_pre) 1479 PHONY += __modinst_pre 1480 __modinst_pre: 1481 @rm -rf $(MODLIB)/kernel 1482 @rm -f $(MODLIB)/source 1483 @mkdir -p $(MODLIB)/kernel 1484 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1485 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1486 rm -f $(MODLIB)/build ; \ 1487 ln -s $(CURDIR) $(MODLIB)/build ; \ 1488 fi 1489 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1490 @cp -f modules.builtin $(MODLIB)/ 1491 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1492 1493 endif # CONFIG_MODULES 1494 1495 ### 1496 # Cleaning is done on three levels. 1497 # make clean Delete most generated files 1498 # Leave enough to build external modules 1499 # make mrproper Delete the current configuration, and all generated files 1500 # make distclean Remove editor backup files, patch leftover files and the like 1501 1502 # Directories & files removed with 'make clean' 1503 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1504 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1505 compile_commands.json .thinlto-cache 1506 1507 # Directories & files removed with 'make mrproper' 1508 MRPROPER_FILES += include/config include/generated \ 1509 arch/$(SRCARCH)/include/generated .objdiff \ 1510 debian snap tar-install \ 1511 .config .config.old .version \ 1512 Module.symvers \ 1513 certs/signing_key.pem \ 1514 certs/x509.genkey \ 1515 vmlinux-gdb.py \ 1516 *.spec 1517 1518 # clean - Delete most, but leave enough to build external modules 1519 # 1520 clean: rm-files := $(CLEAN_FILES) 1521 1522 PHONY += archclean vmlinuxclean 1523 1524 vmlinuxclean: 1525 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1526 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1527 1528 clean: archclean vmlinuxclean resolve_btfids_clean 1529 1530 # mrproper - Delete all generated files, including .config 1531 # 1532 mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1533 mrproper-dirs := $(addprefix _mrproper_,scripts) 1534 1535 PHONY += $(mrproper-dirs) mrproper 1536 $(mrproper-dirs): 1537 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1538 1539 mrproper: clean $(mrproper-dirs) 1540 $(call cmd,rmfiles) 1541 1542 # distclean 1543 # 1544 PHONY += distclean 1545 1546 distclean: mrproper 1547 @find . $(RCS_FIND_IGNORE) \ 1548 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1549 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1550 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1551 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1552 -type f -print | xargs rm -f 1553 1554 1555 # Packaging of the kernel to various formats 1556 # --------------------------------------------------------------------------- 1557 1558 %src-pkg: FORCE 1559 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1560 %pkg: include/config/kernel.release FORCE 1561 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1562 1563 # Brief documentation of the typical targets used 1564 # --------------------------------------------------------------------------- 1565 1566 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1567 boards := $(sort $(notdir $(boards))) 1568 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1569 board-dirs := $(sort $(notdir $(board-dirs:/=))) 1570 1571 PHONY += help 1572 help: 1573 @echo 'Cleaning targets:' 1574 @echo ' clean - Remove most generated files but keep the config and' 1575 @echo ' enough build support to build external modules' 1576 @echo ' mrproper - Remove all generated files + config + various backup files' 1577 @echo ' distclean - mrproper + remove editor backup and patch files' 1578 @echo '' 1579 @echo 'Configuration targets:' 1580 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1581 @echo '' 1582 @echo 'Other generic targets:' 1583 @echo ' all - Build all targets marked with [*]' 1584 @echo '* vmlinux - Build the bare kernel' 1585 @echo '* modules - Build all modules' 1586 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1587 @echo ' dir/ - Build all files in dir and below' 1588 @echo ' dir/file.[ois] - Build specified target only' 1589 @echo ' dir/file.ll - Build the LLVM assembly file' 1590 @echo ' (requires compiler support for LLVM assembly generation)' 1591 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1592 @echo ' (requires a recent binutils and recent build (System.map))' 1593 @echo ' dir/file.ko - Build module including final link' 1594 @echo ' modules_prepare - Set up for building external modules' 1595 @echo ' tags/TAGS - Generate tags file for editors' 1596 @echo ' cscope - Generate cscope index' 1597 @echo ' gtags - Generate GNU GLOBAL index' 1598 @echo ' kernelrelease - Output the release version string (use with make -s)' 1599 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1600 @echo ' image_name - Output the image name (use with make -s)' 1601 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1602 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1603 echo '' 1604 @echo 'Static analysers:' 1605 @echo ' checkstack - Generate a list of stack hogs' 1606 @echo ' versioncheck - Sanity check on version.h usage' 1607 @echo ' includecheck - Check for duplicate included header files' 1608 @echo ' export_report - List the usages of all exported symbols' 1609 @echo ' headerdep - Detect inclusion cycles in headers' 1610 @echo ' coccicheck - Check with Coccinelle' 1611 @echo ' clang-analyzer - Check with clang static analyzer' 1612 @echo ' clang-tidy - Check with clang-tidy' 1613 @echo '' 1614 @echo 'Tools:' 1615 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1616 @echo '' 1617 @echo 'Kernel selftest:' 1618 @echo ' kselftest - Build and run kernel selftest' 1619 @echo ' Build, install, and boot kernel before' 1620 @echo ' running kselftest on it' 1621 @echo ' Run as root for full coverage' 1622 @echo ' kselftest-all - Build kernel selftest' 1623 @echo ' kselftest-install - Build and install kernel selftest' 1624 @echo ' kselftest-clean - Remove all generated kselftest files' 1625 @echo ' kselftest-merge - Merge all the config dependencies of' 1626 @echo ' kselftest to existing .config.' 1627 @echo '' 1628 @$(if $(dtstree), \ 1629 echo 'Devicetree:'; \ 1630 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1631 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1632 echo ' dt_binding_check - Validate device tree binding documents'; \ 1633 echo ' dtbs_check - Validate device tree source files';\ 1634 echo '') 1635 1636 @echo 'Userspace tools targets:' 1637 @echo ' use "make tools/help"' 1638 @echo ' or "cd tools; make help"' 1639 @echo '' 1640 @echo 'Kernel packaging:' 1641 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1642 @echo '' 1643 @echo 'Documentation targets:' 1644 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1645 @echo '' 1646 @echo 'Architecture specific targets ($(SRCARCH)):' 1647 @$(or $(archhelp),\ 1648 echo ' No architecture specific help defined for $(SRCARCH)') 1649 @echo '' 1650 @$(if $(boards), \ 1651 $(foreach b, $(boards), \ 1652 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1653 echo '') 1654 @$(if $(board-dirs), \ 1655 $(foreach b, $(board-dirs), \ 1656 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1657 printf " %-16s - Show all of the above\\n" help-boards; \ 1658 echo '') 1659 1660 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1661 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1662 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1663 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1664 @echo ' (sparse by default)' 1665 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1666 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1667 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1668 @echo ' 1: warnings which may be relevant and do not occur too often' 1669 @echo ' 2: warnings which occur quite often but may still be relevant' 1670 @echo ' 3: more obscure warnings, can most likely be ignored' 1671 @echo ' e: warnings are being treated as errors' 1672 @echo ' Multiple levels can be combined with W=12 or W=123' 1673 @echo '' 1674 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1675 @echo 'For further info see the ./README file' 1676 1677 1678 help-board-dirs := $(addprefix help-,$(board-dirs)) 1679 1680 help-boards: $(help-board-dirs) 1681 1682 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1683 1684 $(help-board-dirs): help-%: 1685 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1686 @$(if $(boards-per-dir), \ 1687 $(foreach b, $(boards-per-dir), \ 1688 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1689 echo '') 1690 1691 1692 # Documentation targets 1693 # --------------------------------------------------------------------------- 1694 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1695 linkcheckdocs dochelp refcheckdocs 1696 PHONY += $(DOC_TARGETS) 1697 $(DOC_TARGETS): 1698 $(Q)$(MAKE) $(build)=Documentation $@ 1699 1700 # Misc 1701 # --------------------------------------------------------------------------- 1702 1703 PHONY += scripts_gdb 1704 scripts_gdb: prepare0 1705 $(Q)$(MAKE) $(build)=scripts/gdb 1706 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1707 1708 ifdef CONFIG_GDB_SCRIPTS 1709 all: scripts_gdb 1710 endif 1711 1712 else # KBUILD_EXTMOD 1713 1714 ### 1715 # External module support. 1716 # When building external modules the kernel used as basis is considered 1717 # read-only, and no consistency checks are made and the make 1718 # system is not used on the basis kernel. If updates are required 1719 # in the basis kernel ordinary make commands (without M=...) must be used. 1720 1721 # We are always building only modules. 1722 KBUILD_BUILTIN := 1723 KBUILD_MODULES := 1 1724 1725 build-dirs := $(KBUILD_EXTMOD) 1726 $(MODORDER): descend 1727 @: 1728 1729 compile_commands.json: $(extmod_prefix)compile_commands.json 1730 PHONY += compile_commands.json 1731 1732 clean-dirs := $(KBUILD_EXTMOD) 1733 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1734 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1735 1736 PHONY += prepare 1737 # now expand this into a simple variable to reduce the cost of shell evaluations 1738 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1739 prepare: 1740 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1741 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1742 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1743 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1744 fi 1745 1746 PHONY += help 1747 help: 1748 @echo ' Building external modules.' 1749 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1750 @echo '' 1751 @echo ' modules - default target, build the module(s)' 1752 @echo ' modules_install - install the module' 1753 @echo ' clean - remove generated files in module directory only' 1754 @echo '' 1755 1756 # no-op for external module builds 1757 PHONY += modules_prepare 1758 1759 endif # KBUILD_EXTMOD 1760 1761 # --------------------------------------------------------------------------- 1762 # Modules 1763 1764 PHONY += modules modules_install 1765 1766 ifdef CONFIG_MODULES 1767 1768 modules: modules_check 1769 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1770 1771 PHONY += modules_check 1772 modules_check: $(MODORDER) 1773 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1774 1775 quiet_cmd_depmod = DEPMOD $(MODLIB) 1776 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1777 $(KERNELRELEASE) 1778 1779 modules_install: 1780 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1781 $(call cmd,depmod) 1782 1783 else # CONFIG_MODULES 1784 1785 # Modules not configured 1786 # --------------------------------------------------------------------------- 1787 1788 modules modules_install: 1789 @echo >&2 '***' 1790 @echo >&2 '*** The present kernel configuration has modules disabled.' 1791 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1792 @echo >&2 '*** to enable CONFIG_MODULES.' 1793 @echo >&2 '***' 1794 @exit 1 1795 1796 endif # CONFIG_MODULES 1797 1798 # Single targets 1799 # --------------------------------------------------------------------------- 1800 # To build individual files in subdirectories, you can do like this: 1801 # 1802 # make foo/bar/baz.s 1803 # 1804 # The supported suffixes for single-target are listed in 'single-targets' 1805 # 1806 # To build only under specific subdirectories, you can do like this: 1807 # 1808 # make foo/bar/baz/ 1809 1810 ifdef single-build 1811 1812 # .ko is special because modpost is needed 1813 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1814 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1815 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1816 1817 $(single-ko): single_modpost 1818 @: 1819 $(single-no-ko): descend 1820 @: 1821 1822 ifeq ($(KBUILD_EXTMOD),) 1823 # For the single build of in-tree modules, use a temporary file to avoid 1824 # the situation of modules_install installing an invalid modules.order. 1825 MODORDER := .modules.tmp 1826 endif 1827 1828 PHONY += single_modpost 1829 single_modpost: $(single-no-ko) modules_prepare 1830 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1831 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1832 1833 KBUILD_MODULES := 1 1834 1835 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1836 1837 # trim unrelated directories 1838 build-dirs := $(foreach d, $(build-dirs), \ 1839 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1840 1841 endif 1842 1843 ifndef CONFIG_MODULES 1844 KBUILD_MODULES := 1845 endif 1846 1847 # Handle descending into subdirectories listed in $(build-dirs) 1848 # Preset locale variables to speed up the build process. Limit locale 1849 # tweaks to this spot to avoid wrong language settings when running 1850 # make menuconfig etc. 1851 # Error messages still appears in the original language 1852 PHONY += descend $(build-dirs) 1853 descend: $(build-dirs) 1854 $(build-dirs): prepare 1855 $(Q)$(MAKE) $(build)=$@ \ 1856 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1857 need-builtin=1 need-modorder=1 1858 1859 clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1860 PHONY += $(clean-dirs) clean 1861 $(clean-dirs): 1862 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1863 1864 clean: $(clean-dirs) 1865 $(call cmd,rmfiles) 1866 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1867 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1868 -o -name '*.ko.*' \ 1869 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1870 -o -name '*.dwo' -o -name '*.lst' \ 1871 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ 1872 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1873 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1874 -o -name '*.asn1.[ch]' \ 1875 -o -name '*.symtypes' -o -name 'modules.order' \ 1876 -o -name '.tmp_*' \ 1877 -o -name '*.c.[012]*.*' \ 1878 -o -name '*.ll' \ 1879 -o -name '*.gcno' \ 1880 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1881 1882 # Generate tags for editors 1883 # --------------------------------------------------------------------------- 1884 quiet_cmd_tags = GEN $@ 1885 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1886 1887 tags TAGS cscope gtags: FORCE 1888 $(call cmd,tags) 1889 1890 # Script to generate missing namespace dependencies 1891 # --------------------------------------------------------------------------- 1892 1893 PHONY += nsdeps 1894 nsdeps: export KBUILD_NSDEPS=1 1895 nsdeps: modules 1896 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1897 1898 # Clang Tooling 1899 # --------------------------------------------------------------------------- 1900 1901 quiet_cmd_gen_compile_commands = GEN $@ 1902 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1903 1904 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1905 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1906 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1907 $(call if_changed,gen_compile_commands) 1908 1909 targets += $(extmod_prefix)compile_commands.json 1910 1911 PHONY += clang-tidy clang-analyzer 1912 1913 ifdef CONFIG_CC_IS_CLANG 1914 quiet_cmd_clang_tools = CHECK $< 1915 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1916 1917 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1918 $(call cmd,clang_tools) 1919 else 1920 clang-tidy clang-analyzer: 1921 @echo "$@ requires CC=clang" >&2 1922 @false 1923 endif 1924 1925 # Scripts to check various things for consistency 1926 # --------------------------------------------------------------------------- 1927 1928 PHONY += includecheck versioncheck coccicheck export_report 1929 1930 includecheck: 1931 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1932 -name '*.[hcS]' -type f -print | sort \ 1933 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1934 1935 versioncheck: 1936 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1937 -name '*.[hcS]' -type f -print | sort \ 1938 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1939 1940 coccicheck: 1941 $(Q)$(BASH) $(srctree)/scripts/$@ 1942 1943 export_report: 1944 $(PERL) $(srctree)/scripts/export_report.pl 1945 1946 PHONY += checkstack kernelrelease kernelversion image_name 1947 1948 # UML needs a little special treatment here. It wants to use the host 1949 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1950 # else wants $(ARCH), including people doing cross-builds, which means 1951 # that $(SUBARCH) doesn't work here. 1952 ifeq ($(ARCH), um) 1953 CHECKSTACK_ARCH := $(SUBARCH) 1954 else 1955 CHECKSTACK_ARCH := $(ARCH) 1956 endif 1957 checkstack: 1958 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1959 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1960 1961 kernelrelease: 1962 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1963 1964 kernelversion: 1965 @echo $(KERNELVERSION) 1966 1967 image_name: 1968 @echo $(KBUILD_IMAGE) 1969 1970 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1971 cmd_rmfiles = rm -rf $(rm-files) 1972 1973 # read saved command lines for existing targets 1974 existing-targets := $(wildcard $(sort $(targets))) 1975 1976 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1977 1978 endif # config-build 1979 endif # mixed-build 1980 endif # need-sub-make 1981 1982 PHONY += FORCE 1983 FORCE: 1984 1985 # Declare the contents of the PHONY variable as phony. We keep that 1986 # information in a variable so we can use it in if_changed and friends. 1987 .PHONY: $(PHONY) 1988