1 # SPDX-License-Identifier: GPL-2.0 2 VERSION = 4 3 PATCHLEVEL = 20 4 SUBLEVEL = 0 5 EXTRAVERSION = -rc4 6 NAME = Shy Crocodile 7 8 # *DOCUMENTATION* 9 # To see a list of typical targets execute "make help" 10 # More info can be located in ./README 11 # Comments in this file are targeted only to the developer, do not 12 # expect to learn how to build the kernel reading this file. 13 14 # That's our default target when none is given on the command line 15 PHONY := _all 16 _all: 17 18 # Do not use make's built-in rules and variables 19 # (this increases performance and avoids hard-to-debug behaviour) 20 MAKEFLAGS += -rR 21 22 # Avoid funny character set dependencies 23 unexport LC_ALL 24 LC_COLLATE=C 25 LC_NUMERIC=C 26 export LC_COLLATE LC_NUMERIC 27 28 # Avoid interference with shell env settings 29 unexport GREP_OPTIONS 30 31 # We are using a recursive build, so we need to do a little thinking 32 # to get the ordering right. 33 # 34 # Most importantly: sub-Makefiles should only ever modify files in 35 # their own directory. If in some directory we have a dependency on 36 # a file in another dir (which doesn't happen often, but it's often 37 # unavoidable when linking the built-in.a targets which finally 38 # turn into vmlinux), we will call a sub make in that other dir, and 39 # after that we are sure that everything which is in that other dir 40 # is now up to date. 41 # 42 # The only cases where we need to modify files which have global 43 # effects are thus separated out and done before the recursive 44 # descending is started. They are now explicitly listed as the 45 # prepare rule. 46 47 # Beautify output 48 # --------------------------------------------------------------------------- 49 # 50 # Normally, we echo the whole command before executing it. By making 51 # that echo $($(quiet)$(cmd)), we now have the possibility to set 52 # $(quiet) to choose other forms of output instead, e.g. 53 # 54 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 55 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 56 # 57 # If $(quiet) is empty, the whole command will be printed. 58 # If it is set to "quiet_", only the short version will be printed. 59 # If it is set to "silent_", nothing will be printed at all, since 60 # the variable $(silent_cmd_cc_o_c) doesn't exist. 61 # 62 # A simple variant is to prefix commands with $(Q) - that's useful 63 # for commands that shall be hidden in non-verbose mode. 64 # 65 # $(Q)ln $@ :< 66 # 67 # If KBUILD_VERBOSE equals 0 then the above command will be hidden. 68 # If KBUILD_VERBOSE equals 1 then the above command is displayed. 69 # 70 # To put more focus on warnings, be less verbose as default 71 # Use 'make V=1' to see the full commands 72 73 ifeq ("$(origin V)", "command line") 74 KBUILD_VERBOSE = $(V) 75 endif 76 ifndef KBUILD_VERBOSE 77 KBUILD_VERBOSE = 0 78 endif 79 80 ifeq ($(KBUILD_VERBOSE),1) 81 quiet = 82 Q = 83 else 84 quiet=quiet_ 85 Q = @ 86 endif 87 88 # If the user is running make -s (silent mode), suppress echoing of 89 # commands 90 91 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 92 quiet=silent_ 93 tools_silent=s 94 endif 95 96 export quiet Q KBUILD_VERBOSE 97 98 # kbuild supports saving output files in a separate directory. 99 # To locate output files in a separate directory two syntaxes are supported. 100 # In both cases the working directory must be the root of the kernel src. 101 # 1) O= 102 # Use "make O=dir/to/store/output/files/" 103 # 104 # 2) Set KBUILD_OUTPUT 105 # Set the environment variable KBUILD_OUTPUT to point to the directory 106 # where the output files shall be placed. 107 # export KBUILD_OUTPUT=dir/to/store/output/files/ 108 # make 109 # 110 # The O= assignment takes precedence over the KBUILD_OUTPUT environment 111 # variable. 112 113 # KBUILD_SRC is not intended to be used by the regular user (for now), 114 # it is set on invocation of make with KBUILD_OUTPUT or O= specified. 115 ifeq ($(KBUILD_SRC),) 116 117 # OK, Make called in directory where kernel src resides 118 # Do we want to locate output files in a separate directory? 119 ifeq ("$(origin O)", "command line") 120 KBUILD_OUTPUT := $(O) 121 endif 122 123 # Cancel implicit rules on top Makefile 124 $(CURDIR)/Makefile Makefile: ; 125 126 ifneq ($(words $(subst :, ,$(CURDIR))), 1) 127 $(error main directory cannot contain spaces nor colons) 128 endif 129 130 ifneq ($(KBUILD_OUTPUT),) 131 # check that the output directory actually exists 132 saved-output := $(KBUILD_OUTPUT) 133 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 134 && pwd) 135 $(if $(KBUILD_OUTPUT),, \ 136 $(error failed to create output directory "$(saved-output)")) 137 138 # Look for make include files relative to root of kernel src 139 # 140 # This does not become effective immediately because MAKEFLAGS is re-parsed 141 # once after the Makefile is read. It is OK since we are going to invoke 142 # 'sub-make' below. 143 MAKEFLAGS += --include-dir=$(CURDIR) 144 145 PHONY += $(MAKECMDGOALS) sub-make 146 147 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 148 @: 149 150 # Invoke a second make in the output directory, passing relevant variables 151 sub-make: 152 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 153 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 154 155 # Leave processing to above invocation of make 156 skip-makefile := 1 157 endif # ifneq ($(KBUILD_OUTPUT),) 158 endif # ifeq ($(KBUILD_SRC),) 159 160 # We process the rest of the Makefile if this is the final invocation of make 161 ifeq ($(skip-makefile),) 162 163 # Do not print "Entering directory ...", 164 # but we want to display it when entering to the output directory 165 # so that IDEs/editors are able to understand relative filenames. 166 MAKEFLAGS += --no-print-directory 167 168 # Call a source code checker (by default, "sparse") as part of the 169 # C compilation. 170 # 171 # Use 'make C=1' to enable checking of only re-compiled files. 172 # Use 'make C=2' to enable checking of *all* source files, regardless 173 # of whether they are re-compiled or not. 174 # 175 # See the file "Documentation/dev-tools/sparse.rst" for more details, 176 # including where to get the "sparse" utility. 177 178 ifeq ("$(origin C)", "command line") 179 KBUILD_CHECKSRC = $(C) 180 endif 181 ifndef KBUILD_CHECKSRC 182 KBUILD_CHECKSRC = 0 183 endif 184 185 # Use make M=dir to specify directory of external module to build 186 # Old syntax make ... SUBDIRS=$PWD is still supported 187 # Setting the environment variable KBUILD_EXTMOD take precedence 188 ifdef SUBDIRS 189 KBUILD_EXTMOD ?= $(SUBDIRS) 190 endif 191 192 ifeq ("$(origin M)", "command line") 193 KBUILD_EXTMOD := $(M) 194 endif 195 196 ifeq ($(KBUILD_SRC),) 197 # building in the source tree 198 srctree := . 199 else 200 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 201 # building in a subdirectory of the source tree 202 srctree := .. 203 else 204 srctree := $(KBUILD_SRC) 205 endif 206 endif 207 208 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 209 210 objtree := . 211 src := $(srctree) 212 obj := $(objtree) 213 214 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 215 216 export srctree objtree VPATH 217 218 # To make sure we do not include .config for any of the *config targets 219 # catch them early, and hand them over to scripts/kconfig/Makefile 220 # It is allowed to specify more targets when calling make, including 221 # mixing *config targets and build targets. 222 # For example 'make oldconfig all'. 223 # Detect when mixed targets is specified, and make a second invocation 224 # of make so .config is not included in this case either (for *config). 225 226 version_h := include/generated/uapi/linux/version.h 227 old_version_h := include/linux/version.h 228 229 clean-targets := %clean mrproper cleandocs 230 no-dot-config-targets := $(clean-targets) \ 231 cscope gtags TAGS tags help% %docs check% coccicheck \ 232 $(version_h) headers_% archheaders archscripts \ 233 %asm-generic kernelversion %src-pkg 234 no-sync-config-targets := $(no-dot-config-targets) install %install \ 235 kernelrelease 236 237 config-targets := 0 238 mixed-targets := 0 239 dot-config := 1 240 may-sync-config := 1 241 242 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 243 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 244 dot-config := 0 245 endif 246 endif 247 248 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 249 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 250 may-sync-config := 0 251 endif 252 endif 253 254 ifneq ($(KBUILD_EXTMOD),) 255 may-sync-config := 0 256 endif 257 258 ifeq ($(KBUILD_EXTMOD),) 259 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 260 config-targets := 1 261 ifneq ($(words $(MAKECMDGOALS)),1) 262 mixed-targets := 1 263 endif 264 endif 265 endif 266 267 # For "make -j clean all", "make -j mrproper defconfig all", etc. 268 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 269 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 270 mixed-targets := 1 271 endif 272 endif 273 274 # install and modules_install need also be processed one by one 275 ifneq ($(filter install,$(MAKECMDGOALS)),) 276 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 277 mixed-targets := 1 278 endif 279 endif 280 281 ifeq ($(mixed-targets),1) 282 # =========================================================================== 283 # We're called with mixed targets (*config and build targets). 284 # Handle them one by one. 285 286 PHONY += $(MAKECMDGOALS) __build_one_by_one 287 288 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 289 @: 290 291 __build_one_by_one: 292 $(Q)set -e; \ 293 for i in $(MAKECMDGOALS); do \ 294 $(MAKE) -f $(srctree)/Makefile $$i; \ 295 done 296 297 else 298 299 # We need some generic definitions (do not try to remake the file). 300 scripts/Kbuild.include: ; 301 include scripts/Kbuild.include 302 303 # Read KERNELRELEASE from include/config/kernel.release (if it exists) 304 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 305 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 306 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 307 308 include scripts/subarch.include 309 310 # Cross compiling and selecting different set of gcc/bin-utils 311 # --------------------------------------------------------------------------- 312 # 313 # When performing cross compilation for other architectures ARCH shall be set 314 # to the target architecture. (See arch/* for the possibilities). 315 # ARCH can be set during invocation of make: 316 # make ARCH=ia64 317 # Another way is to have ARCH set in the environment. 318 # The default ARCH is the host where make is executed. 319 320 # CROSS_COMPILE specify the prefix used for all executables used 321 # during compilation. Only gcc and related bin-utils executables 322 # are prefixed with $(CROSS_COMPILE). 323 # CROSS_COMPILE can be set on the command line 324 # make CROSS_COMPILE=ia64-linux- 325 # Alternatively CROSS_COMPILE can be set in the environment. 326 # Default value for CROSS_COMPILE is not to prefix executables 327 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 328 ARCH ?= $(SUBARCH) 329 330 # Architecture as present in compile.h 331 UTS_MACHINE := $(ARCH) 332 SRCARCH := $(ARCH) 333 334 # Additional ARCH settings for x86 335 ifeq ($(ARCH),i386) 336 SRCARCH := x86 337 endif 338 ifeq ($(ARCH),x86_64) 339 SRCARCH := x86 340 endif 341 342 # Additional ARCH settings for sparc 343 ifeq ($(ARCH),sparc32) 344 SRCARCH := sparc 345 endif 346 ifeq ($(ARCH),sparc64) 347 SRCARCH := sparc 348 endif 349 350 # Additional ARCH settings for sh 351 ifeq ($(ARCH),sh64) 352 SRCARCH := sh 353 endif 354 355 KCONFIG_CONFIG ?= .config 356 export KCONFIG_CONFIG 357 358 # SHELL used by kbuild 359 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 360 else if [ -x /bin/bash ]; then echo /bin/bash; \ 361 else echo sh; fi ; fi) 362 363 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 364 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 365 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 366 367 HOSTCC = gcc 368 HOSTCXX = g++ 369 KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 370 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 371 $(HOSTCFLAGS) 372 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 373 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 374 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 375 376 # Make variables (CC, etc...) 377 AS = $(CROSS_COMPILE)as 378 LD = $(CROSS_COMPILE)ld 379 CC = $(CROSS_COMPILE)gcc 380 CPP = $(CC) -E 381 AR = $(CROSS_COMPILE)ar 382 NM = $(CROSS_COMPILE)nm 383 STRIP = $(CROSS_COMPILE)strip 384 OBJCOPY = $(CROSS_COMPILE)objcopy 385 OBJDUMP = $(CROSS_COMPILE)objdump 386 LEX = flex 387 YACC = bison 388 AWK = awk 389 GENKSYMS = scripts/genksyms/genksyms 390 INSTALLKERNEL := installkernel 391 DEPMOD = /sbin/depmod 392 PERL = perl 393 PYTHON = python 394 PYTHON2 = python2 395 PYTHON3 = python3 396 CHECK = sparse 397 398 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 399 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 400 NOSTDINC_FLAGS = 401 CFLAGS_MODULE = 402 AFLAGS_MODULE = 403 LDFLAGS_MODULE = 404 CFLAGS_KERNEL = 405 AFLAGS_KERNEL = 406 LDFLAGS_vmlinux = 407 408 # Use USERINCLUDE when you must reference the UAPI directories only. 409 USERINCLUDE := \ 410 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 411 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 412 -I$(srctree)/include/uapi \ 413 -I$(objtree)/include/generated/uapi \ 414 -include $(srctree)/include/linux/kconfig.h 415 416 # Use LINUXINCLUDE when you must reference the include/ directory. 417 # Needed to be compatible with the O= option 418 LINUXINCLUDE := \ 419 -I$(srctree)/arch/$(SRCARCH)/include \ 420 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 421 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 422 -I$(objtree)/include \ 423 $(USERINCLUDE) 424 425 KBUILD_AFLAGS := -D__ASSEMBLY__ 426 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 427 -fno-strict-aliasing -fno-common -fshort-wchar \ 428 -Werror-implicit-function-declaration \ 429 -Wno-format-security \ 430 -std=gnu89 431 KBUILD_CPPFLAGS := -D__KERNEL__ 432 KBUILD_AFLAGS_KERNEL := 433 KBUILD_CFLAGS_KERNEL := 434 KBUILD_AFLAGS_MODULE := -DMODULE 435 KBUILD_CFLAGS_MODULE := -DMODULE 436 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 437 KBUILD_LDFLAGS := 438 GCC_PLUGINS_CFLAGS := 439 440 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 441 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 442 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 443 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 444 445 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 446 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 447 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 448 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 449 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 450 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 451 export KBUILD_ARFLAGS 452 453 # When compiling out-of-tree modules, put MODVERDIR in the module 454 # tree rather than in the kernel tree. The kernel tree might 455 # even be read-only. 456 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 457 458 # Files to ignore in find ... statements 459 460 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 461 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 462 -prune -o 463 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 464 --exclude CVS --exclude .pc --exclude .hg --exclude .git 465 466 # =========================================================================== 467 # Rules shared between *config targets and build targets 468 469 # Basic helpers built in scripts/basic/ 470 PHONY += scripts_basic 471 scripts_basic: 472 $(Q)$(MAKE) $(build)=scripts/basic 473 $(Q)rm -f .tmp_quiet_recordmcount 474 475 # To avoid any implicit rule to kick in, define an empty command. 476 scripts/basic/%: scripts_basic ; 477 478 PHONY += outputmakefile 479 # outputmakefile generates a Makefile in the output directory, if using a 480 # separate output directory. This allows convenient use of make in the 481 # output directory. 482 outputmakefile: 483 ifneq ($(KBUILD_SRC),) 484 $(Q)ln -fsn $(srctree) source 485 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 486 endif 487 488 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 489 ifneq ($(CROSS_COMPILE),) 490 CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 491 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD))) 492 CLANG_PREFIX := --prefix=$(GCC_TOOLCHAIN_DIR) 493 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 494 endif 495 ifneq ($(GCC_TOOLCHAIN),) 496 CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 497 endif 498 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX) 499 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX) 500 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 501 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 502 endif 503 504 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 505 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 506 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 507 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 508 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 509 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 510 export RETPOLINE_CFLAGS 511 export RETPOLINE_VDSO_CFLAGS 512 513 KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 514 KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 515 516 # check for 'asm goto' 517 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 518 CC_HAVE_ASM_GOTO := 1 519 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 520 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 521 endif 522 523 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 524 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 525 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 526 # and from include/config/auto.conf.cmd to detect the compiler upgrade. 527 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 528 529 ifeq ($(config-targets),1) 530 # =========================================================================== 531 # *config targets only - make sure prerequisites are updated, and descend 532 # in scripts/kconfig to make the *config target 533 534 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 535 # KBUILD_DEFCONFIG may point out an alternative default configuration 536 # used for 'make defconfig' 537 include arch/$(SRCARCH)/Makefile 538 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 539 540 config: scripts_basic outputmakefile FORCE 541 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 542 543 %config: scripts_basic outputmakefile FORCE 544 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 545 546 else 547 # =========================================================================== 548 # Build targets only - this includes vmlinux, arch specific targets, clean 549 # targets and others. In general all targets except *config targets. 550 551 # If building an external module we do not care about the all: rule 552 # but instead _all depend on modules 553 PHONY += all 554 ifeq ($(KBUILD_EXTMOD),) 555 _all: all 556 else 557 _all: modules 558 endif 559 560 # Decide whether to build built-in, modular, or both. 561 # Normally, just do built-in. 562 563 KBUILD_MODULES := 564 KBUILD_BUILTIN := 1 565 566 # If we have only "make modules", don't compile built-in objects. 567 # When we're building modules with modversions, we need to consider 568 # the built-in objects during the descend as well, in order to 569 # make sure the checksums are up to date before we record them. 570 571 ifeq ($(MAKECMDGOALS),modules) 572 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 573 endif 574 575 # If we have "make <whatever> modules", compile modules 576 # in addition to whatever we do anyway. 577 # Just "make" or "make all" shall build modules as well 578 579 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 580 KBUILD_MODULES := 1 581 endif 582 583 ifeq ($(MAKECMDGOALS),) 584 KBUILD_MODULES := 1 585 endif 586 587 export KBUILD_MODULES KBUILD_BUILTIN 588 589 ifeq ($(KBUILD_EXTMOD),) 590 # Objects we will link into vmlinux / subdirs we need to visit 591 init-y := init/ 592 drivers-y := drivers/ sound/ firmware/ 593 net-y := net/ 594 libs-y := lib/ 595 core-y := usr/ 596 virt-y := virt/ 597 endif # KBUILD_EXTMOD 598 599 ifeq ($(dot-config),1) 600 include include/config/auto.conf 601 endif 602 603 # The all: target is the default when no target is given on the 604 # command line. 605 # This allow a user to issue only 'make' to build a kernel including modules 606 # Defaults to vmlinux, but the arch makefile usually adds further targets 607 all: vmlinux 608 609 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 610 $(call cc-option,-fno-tree-loop-im) \ 611 $(call cc-disable-warning,maybe-uninitialized,) 612 export CFLAGS_GCOV 613 614 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 615 ifdef CONFIG_FUNCTION_TRACER 616 CC_FLAGS_FTRACE := -pg 617 endif 618 619 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 620 # values of the respective KBUILD_* variables 621 ARCH_CPPFLAGS := 622 ARCH_AFLAGS := 623 ARCH_CFLAGS := 624 include arch/$(SRCARCH)/Makefile 625 626 ifeq ($(dot-config),1) 627 ifeq ($(may-sync-config),1) 628 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if 629 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile 630 # because some architectures define CROSS_COMPILE there. 631 -include include/config/auto.conf.cmd 632 633 # To avoid any implicit rule to kick in, define an empty command 634 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 635 636 # The actual configuration files used during the build are stored in 637 # include/generated/ and include/config/. Update them if .config is newer than 638 # include/config/auto.conf (which mirrors .config). 639 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 640 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 641 else 642 # External modules and some install targets need include/generated/autoconf.h 643 # and include/config/auto.conf but do not care if they are up-to-date. 644 # Use auto.conf to trigger the test 645 PHONY += include/config/auto.conf 646 647 include/config/auto.conf: 648 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 649 echo >&2; \ 650 echo >&2 " ERROR: Kernel configuration is invalid."; \ 651 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 652 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 653 echo >&2 ; \ 654 /bin/false) 655 656 endif # may-sync-config 657 endif # $(dot-config) 658 659 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 660 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 661 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 662 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 663 KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 664 665 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 666 KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 667 KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 668 else 669 ifdef CONFIG_PROFILE_ALL_BRANCHES 670 KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 671 else 672 KBUILD_CFLAGS += -O2 673 endif 674 endif 675 676 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 677 $(call cc-disable-warning,maybe-uninitialized,)) 678 679 # Tell gcc to never replace conditional load with a non-conditional one 680 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 681 682 include scripts/Makefile.kcov 683 include scripts/Makefile.gcc-plugins 684 685 ifdef CONFIG_READABLE_ASM 686 # Disable optimizations that make assembler listings hard to read. 687 # reorder blocks reorders the control in the function 688 # ipa clone creates specialized cloned functions 689 # partial inlining inlines only parts of functions 690 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 691 $(call cc-option,-fno-ipa-cp-clone,) \ 692 $(call cc-option,-fno-partial-inlining) 693 endif 694 695 ifneq ($(CONFIG_FRAME_WARN),0) 696 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 697 endif 698 699 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 700 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 701 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 702 703 KBUILD_CFLAGS += $(stackp-flags-y) 704 705 ifdef CONFIG_CC_IS_CLANG 706 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 707 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 708 KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 709 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 710 # Quiet clang warning: comparison of unsigned expression < 0 is always false 711 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 712 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 713 # source of a reference will be _MergedGlobals and not on of the whitelisted names. 714 # See modpost pattern 2 715 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 716 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 717 else 718 719 # These warnings generated too much noise in a regular build. 720 # Use make W=1 to enable them (see scripts/Makefile.extrawarn) 721 KBUILD_CFLAGS += -Wno-unused-but-set-variable 722 endif 723 724 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 725 ifdef CONFIG_FRAME_POINTER 726 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 727 else 728 # Some targets (ARM with Thumb2, for example), can't be built with frame 729 # pointers. For those, we don't have FUNCTION_TRACER automatically 730 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 731 # incompatible with -fomit-frame-pointer with current GCC, so we don't use 732 # -fomit-frame-pointer with FUNCTION_TRACER. 733 ifndef CONFIG_FUNCTION_TRACER 734 KBUILD_CFLAGS += -fomit-frame-pointer 735 endif 736 endif 737 738 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 739 740 ifdef CONFIG_DEBUG_INFO 741 ifdef CONFIG_DEBUG_INFO_SPLIT 742 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 743 else 744 KBUILD_CFLAGS += -g 745 endif 746 KBUILD_AFLAGS += -Wa,-gdwarf-2 747 endif 748 ifdef CONFIG_DEBUG_INFO_DWARF4 749 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 750 endif 751 752 ifdef CONFIG_DEBUG_INFO_REDUCED 753 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 754 $(call cc-option,-fno-var-tracking) 755 endif 756 757 ifdef CONFIG_FUNCTION_TRACER 758 ifdef CONFIG_FTRACE_MCOUNT_RECORD 759 # gcc 5 supports generating the mcount tables directly 760 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 761 CC_FLAGS_FTRACE += -mrecord-mcount 762 export CC_USING_RECORD_MCOUNT := 1 763 endif 764 ifdef CONFIG_HAVE_NOP_MCOUNT 765 ifeq ($(call cc-option-yn, -mnop-mcount),y) 766 CC_FLAGS_FTRACE += -mnop-mcount 767 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 768 endif 769 endif 770 endif 771 ifdef CONFIG_HAVE_FENTRY 772 ifeq ($(call cc-option-yn, -mfentry),y) 773 CC_FLAGS_FTRACE += -mfentry 774 CC_FLAGS_USING += -DCC_USING_FENTRY 775 endif 776 endif 777 export CC_FLAGS_FTRACE 778 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 779 KBUILD_AFLAGS += $(CC_FLAGS_USING) 780 ifdef CONFIG_DYNAMIC_FTRACE 781 ifdef CONFIG_HAVE_C_RECORDMCOUNT 782 BUILD_C_RECORDMCOUNT := y 783 export BUILD_C_RECORDMCOUNT 784 endif 785 endif 786 endif 787 788 # We trigger additional mismatches with less inlining 789 ifdef CONFIG_DEBUG_SECTION_MISMATCH 790 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 791 endif 792 793 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 794 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 795 LDFLAGS_vmlinux += --gc-sections 796 endif 797 798 # arch Makefile may override CC so keep this after arch Makefile is included 799 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 800 801 # warn about C99 declaration after statement 802 KBUILD_CFLAGS += -Wdeclaration-after-statement 803 804 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel 805 KBUILD_CFLAGS += $(call cc-option,-Wvla) 806 807 # disable pointer signed / unsigned warnings in gcc 4.0 808 KBUILD_CFLAGS += -Wno-pointer-sign 809 810 # disable stringop warnings in gcc 8+ 811 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 812 813 # disable invalid "can't wrap" optimizations for signed / pointers 814 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 815 816 # clang sets -fmerge-all-constants by default as optimization, but this 817 # is non-conforming behavior for C and in fact breaks the kernel, so we 818 # need to disable it here generally. 819 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 820 821 # for gcc -fno-merge-all-constants disables everything, but it is fine 822 # to have actual conforming behavior enabled. 823 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 824 825 # Make sure -fstack-check isn't enabled (like gentoo apparently did) 826 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 827 828 # conserve stack if available 829 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 830 831 # disallow errors like 'EXPORT_GPL(foo);' with missing header 832 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 833 834 # require functions to have arguments in prototypes, not empty 'int foo()' 835 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 836 837 # Prohibit date/time macros, which would make the build non-deterministic 838 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 839 840 # enforce correct pointer usage 841 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 842 843 # Require designated initializers for all marked structures 844 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 845 846 # change __FILE__ to the relative path from the srctree 847 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 848 849 # use the deterministic mode of AR if available 850 KBUILD_ARFLAGS := $(call ar-option,D) 851 852 include scripts/Makefile.kasan 853 include scripts/Makefile.extrawarn 854 include scripts/Makefile.ubsan 855 856 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 857 # last assignments 858 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 859 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 860 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 861 862 # Use --build-id when available. 863 LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 864 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 865 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 866 867 ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 868 LDFLAGS_vmlinux += $(call ld-option, -X,) 869 endif 870 871 # insure the checker run with the right endianness 872 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 873 874 # the checker needs the correct machine size 875 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 876 877 # Default kernel image to build when no specific target is given. 878 # KBUILD_IMAGE may be overruled on the command line or 879 # set in the environment 880 # Also any assignments in arch/$(ARCH)/Makefile take precedence over 881 # this default value 882 export KBUILD_IMAGE ?= vmlinux 883 884 # 885 # INSTALL_PATH specifies where to place the updated kernel and system map 886 # images. Default is /boot, but you can set it to other values 887 export INSTALL_PATH ?= /boot 888 889 # 890 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 891 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 892 # an argument if needed. Otherwise it defaults to the kernel install path 893 # 894 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 895 896 # 897 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 898 # relocations required by build roots. This is not defined in the 899 # makefile but the argument can be passed to make if needed. 900 # 901 902 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 903 export MODLIB 904 905 # 906 # INSTALL_MOD_STRIP, if defined, will cause modules to be 907 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 908 # the default option --strip-debug will be used. Otherwise, 909 # INSTALL_MOD_STRIP value will be used as the options to the strip command. 910 911 ifdef INSTALL_MOD_STRIP 912 ifeq ($(INSTALL_MOD_STRIP),1) 913 mod_strip_cmd = $(STRIP) --strip-debug 914 else 915 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 916 endif # INSTALL_MOD_STRIP=1 917 else 918 mod_strip_cmd = true 919 endif # INSTALL_MOD_STRIP 920 export mod_strip_cmd 921 922 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 923 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 924 # or CONFIG_MODULE_COMPRESS_XZ. 925 926 mod_compress_cmd = true 927 ifdef CONFIG_MODULE_COMPRESS 928 ifdef CONFIG_MODULE_COMPRESS_GZIP 929 mod_compress_cmd = gzip -n -f 930 endif # CONFIG_MODULE_COMPRESS_GZIP 931 ifdef CONFIG_MODULE_COMPRESS_XZ 932 mod_compress_cmd = xz -f 933 endif # CONFIG_MODULE_COMPRESS_XZ 934 endif # CONFIG_MODULE_COMPRESS 935 export mod_compress_cmd 936 937 # Select initial ramdisk compression format, default is gzip(1). 938 # This shall be used by the dracut(8) tool while creating an initramfs image. 939 # 940 INITRD_COMPRESS-y := gzip 941 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 942 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 943 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 944 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 945 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 946 # do not export INITRD_COMPRESS, since we didn't actually 947 # choose a sane default compression above. 948 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 949 950 ifdef CONFIG_MODULE_SIG_ALL 951 $(eval $(call config_filename,MODULE_SIG_KEY)) 952 953 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 954 else 955 mod_sign_cmd = true 956 endif 957 export mod_sign_cmd 958 959 ifdef CONFIG_STACK_VALIDATION 960 has_libelf := $(call try-run,\ 961 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 962 ifeq ($(has_libelf),1) 963 objtool_target := tools/objtool FORCE 964 else 965 ifdef CONFIG_UNWINDER_ORC 966 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 967 else 968 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 969 endif 970 SKIP_STACK_VALIDATION := 1 971 export SKIP_STACK_VALIDATION 972 endif 973 endif 974 975 976 ifeq ($(KBUILD_EXTMOD),) 977 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 978 979 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 980 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 981 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 982 983 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 984 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 985 986 init-y := $(patsubst %/, %/built-in.a, $(init-y)) 987 core-y := $(patsubst %/, %/built-in.a, $(core-y)) 988 drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 989 net-y := $(patsubst %/, %/built-in.a, $(net-y)) 990 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 991 libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 992 virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 993 994 # Externally visible symbols (used by link-vmlinux.sh) 995 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 996 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 997 export KBUILD_VMLINUX_LIBS := $(libs-y1) 998 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 999 export LDFLAGS_vmlinux 1000 # used by scripts/package/Makefile 1001 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1002 1003 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1004 1005 # Recurse until adjust_autoksyms.sh is satisfied 1006 PHONY += autoksyms_recursive 1007 autoksyms_recursive: $(vmlinux-deps) 1008 ifdef CONFIG_TRIM_UNUSED_KSYMS 1009 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1010 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1011 endif 1012 1013 # For the kernel to actually contain only the needed exported symbols, 1014 # we have to build modules as well to determine what those symbols are. 1015 # (this can be evaluated only once include/config/auto.conf has been included) 1016 ifdef CONFIG_TRIM_UNUSED_KSYMS 1017 KBUILD_MODULES := 1 1018 endif 1019 1020 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1021 1022 $(autoksyms_h): 1023 $(Q)mkdir -p $(dir $@) 1024 $(Q)touch $@ 1025 1026 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1027 1028 # Final link of vmlinux with optional arch pass after final link 1029 cmd_link-vmlinux = \ 1030 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1031 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1032 1033 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1034 ifdef CONFIG_HEADERS_CHECK 1035 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1036 endif 1037 ifdef CONFIG_GDB_SCRIPTS 1038 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1039 endif 1040 +$(call if_changed,link-vmlinux) 1041 1042 # Build samples along the rest of the kernel. This needs headers_install. 1043 ifdef CONFIG_SAMPLES 1044 vmlinux-dirs += samples 1045 samples: headers_install 1046 endif 1047 1048 # The actual objects are generated when descending, 1049 # make sure no implicit rule kicks in 1050 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1051 1052 # Handle descending into subdirectories listed in $(vmlinux-dirs) 1053 # Preset locale variables to speed up the build process. Limit locale 1054 # tweaks to this spot to avoid wrong language settings when running 1055 # make menuconfig etc. 1056 # Error messages still appears in the original language 1057 1058 PHONY += $(vmlinux-dirs) 1059 $(vmlinux-dirs): prepare scripts 1060 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1061 1062 define filechk_kernel.release 1063 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1064 endef 1065 1066 # Store (new) KERNELRELEASE string in include/config/kernel.release 1067 include/config/kernel.release: $(srctree)/Makefile FORCE 1068 $(call filechk,kernel.release) 1069 1070 # Additional helpers built in scripts/ 1071 # Carefully list dependencies so we do not try to build scripts twice 1072 # in parallel 1073 PHONY += scripts 1074 scripts: scripts_basic scripts_dtc asm-generic gcc-plugins $(autoksyms_h) 1075 $(Q)$(MAKE) $(build)=$(@) 1076 1077 # Things we need to do before we recursively start building the kernel 1078 # or the modules are listed in "prepare". 1079 # A multi level approach is used. prepareN is processed before prepareN-1. 1080 # archprepare is used in arch Makefiles and when processed asm symlink, 1081 # version.h and scripts_basic is processed / created. 1082 1083 # Listed in dependency order 1084 PHONY += prepare archprepare macroprepare prepare0 prepare1 prepare2 prepare3 1085 1086 # prepare3 is used to check if we are building in a separate output directory, 1087 # and if so do: 1088 # 1) Check that make has not been executed in the kernel src $(srctree) 1089 prepare3: include/config/kernel.release 1090 ifneq ($(KBUILD_SRC),) 1091 @$(kecho) ' Using $(srctree) as source for kernel' 1092 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1093 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1094 echo >&2 " in the '$(srctree)' directory.";\ 1095 /bin/false; \ 1096 fi; 1097 endif 1098 1099 # prepare2 creates a makefile if using a separate output directory. 1100 # From this point forward, .config has been reprocessed, so any rules 1101 # that need to depend on updated CONFIG_* values can be checked here. 1102 prepare2: prepare3 outputmakefile asm-generic 1103 1104 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1105 $(cmd_crmodverdir) 1106 1107 macroprepare: prepare1 archmacros 1108 1109 archprepare: archheaders archscripts macroprepare scripts_basic 1110 1111 prepare0: archprepare gcc-plugins 1112 $(Q)$(MAKE) $(build)=. 1113 1114 # All the preparing.. 1115 prepare: prepare0 prepare-objtool 1116 1117 # Support for using generic headers in asm-generic 1118 PHONY += asm-generic uapi-asm-generic 1119 asm-generic: uapi-asm-generic 1120 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1121 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1122 uapi-asm-generic: 1123 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1124 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1125 1126 PHONY += prepare-objtool 1127 prepare-objtool: $(objtool_target) 1128 1129 # Generate some files 1130 # --------------------------------------------------------------------------- 1131 1132 # KERNELRELEASE can change from a few different places, meaning version.h 1133 # needs to be updated, so this check is forced on all builds 1134 1135 uts_len := 64 1136 define filechk_utsrelease.h 1137 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1138 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1139 exit 1; \ 1140 fi; \ 1141 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1142 endef 1143 1144 define filechk_version.h 1145 (echo \#define LINUX_VERSION_CODE $(shell \ 1146 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1147 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1148 endef 1149 1150 $(version_h): FORCE 1151 $(call filechk,version.h) 1152 $(Q)rm -f $(old_version_h) 1153 1154 include/generated/utsrelease.h: include/config/kernel.release FORCE 1155 $(call filechk,utsrelease.h) 1156 1157 PHONY += headerdep 1158 headerdep: 1159 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1160 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1161 1162 # --------------------------------------------------------------------------- 1163 # Kernel headers 1164 1165 #Default location for installed headers 1166 export INSTALL_HDR_PATH = $(objtree)/usr 1167 1168 # If we do an all arch process set dst to include/arch-$(SRCARCH) 1169 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1170 1171 PHONY += archheaders 1172 archheaders: 1173 1174 PHONY += archscripts 1175 archscripts: 1176 1177 PHONY += archmacros 1178 archmacros: 1179 1180 PHONY += __headers 1181 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1182 $(Q)$(MAKE) $(build)=scripts build_unifdef 1183 1184 PHONY += headers_install_all 1185 headers_install_all: 1186 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1187 1188 PHONY += headers_install 1189 headers_install: __headers 1190 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1191 $(error Headers not exportable for the $(SRCARCH) architecture)) 1192 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1193 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1194 1195 PHONY += headers_check_all 1196 headers_check_all: headers_install_all 1197 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1198 1199 PHONY += headers_check 1200 headers_check: headers_install 1201 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1202 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1203 1204 # --------------------------------------------------------------------------- 1205 # Kernel selftest 1206 1207 PHONY += kselftest 1208 kselftest: 1209 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1210 1211 PHONY += kselftest-clean 1212 kselftest-clean: 1213 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1214 1215 PHONY += kselftest-merge 1216 kselftest-merge: 1217 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1218 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1219 -m $(objtree)/.config \ 1220 $(srctree)/tools/testing/selftests/*/config 1221 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1222 1223 # --------------------------------------------------------------------------- 1224 # Devicetree files 1225 1226 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1227 dtstree := arch/$(SRCARCH)/boot/dts 1228 endif 1229 1230 ifneq ($(dtstree),) 1231 1232 %.dtb: prepare3 scripts_dtc 1233 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1234 1235 PHONY += dtbs dtbs_install 1236 dtbs: prepare3 scripts_dtc 1237 $(Q)$(MAKE) $(build)=$(dtstree) 1238 1239 dtbs_install: 1240 $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1241 1242 ifdef CONFIG_OF_EARLY_FLATTREE 1243 all: dtbs 1244 endif 1245 1246 endif 1247 1248 PHONY += scripts_dtc 1249 scripts_dtc: scripts_basic 1250 $(Q)$(MAKE) $(build)=scripts/dtc 1251 1252 # --------------------------------------------------------------------------- 1253 # Modules 1254 1255 ifdef CONFIG_MODULES 1256 1257 # By default, build modules as well 1258 1259 all: modules 1260 1261 # Build modules 1262 # 1263 # A module can be listed more than once in obj-m resulting in 1264 # duplicate lines in modules.order files. Those are removed 1265 # using awk while concatenating to the final file. 1266 1267 PHONY += modules 1268 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1269 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1270 @$(kecho) ' Building modules, stage 2.'; 1271 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1272 1273 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1274 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1275 1276 %/modules.builtin: include/config/auto.conf include/config/tristate.conf 1277 $(Q)$(MAKE) $(modbuiltin)=$* 1278 1279 1280 # Target to prepare building external modules 1281 PHONY += modules_prepare 1282 modules_prepare: prepare scripts 1283 1284 # Target to install modules 1285 PHONY += modules_install 1286 modules_install: _modinst_ _modinst_post 1287 1288 PHONY += _modinst_ 1289 _modinst_: 1290 @rm -rf $(MODLIB)/kernel 1291 @rm -f $(MODLIB)/source 1292 @mkdir -p $(MODLIB)/kernel 1293 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1294 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1295 rm -f $(MODLIB)/build ; \ 1296 ln -s $(CURDIR) $(MODLIB)/build ; \ 1297 fi 1298 @cp -f $(objtree)/modules.order $(MODLIB)/ 1299 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1300 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1301 1302 # This depmod is only for convenience to give the initial 1303 # boot a modules.dep even before / is mounted read-write. However the 1304 # boot script depmod is the master version. 1305 PHONY += _modinst_post 1306 _modinst_post: _modinst_ 1307 $(call cmd,depmod) 1308 1309 ifeq ($(CONFIG_MODULE_SIG), y) 1310 PHONY += modules_sign 1311 modules_sign: 1312 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1313 endif 1314 1315 else # CONFIG_MODULES 1316 1317 # Modules not configured 1318 # --------------------------------------------------------------------------- 1319 1320 PHONY += modules modules_install 1321 modules modules_install: 1322 @echo >&2 1323 @echo >&2 "The present kernel configuration has modules disabled." 1324 @echo >&2 "Type 'make config' and enable loadable module support." 1325 @echo >&2 "Then build a kernel with module support enabled." 1326 @echo >&2 1327 @exit 1 1328 1329 endif # CONFIG_MODULES 1330 1331 ### 1332 # Cleaning is done on three levels. 1333 # make clean Delete most generated files 1334 # Leave enough to build external modules 1335 # make mrproper Delete the current configuration, and all generated files 1336 # make distclean Remove editor backup files, patch leftover files and the like 1337 1338 # Directories & files removed with 'make clean' 1339 CLEAN_DIRS += $(MODVERDIR) include/ksym 1340 1341 # Directories & files removed with 'make mrproper' 1342 MRPROPER_DIRS += include/config usr/include include/generated \ 1343 arch/*/include/generated .tmp_objdiff 1344 MRPROPER_FILES += .config .config.old .version \ 1345 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1346 signing_key.pem signing_key.priv signing_key.x509 \ 1347 x509.genkey extra_certificates signing_key.x509.keyid \ 1348 signing_key.x509.signer vmlinux-gdb.py 1349 1350 # clean - Delete most, but leave enough to build external modules 1351 # 1352 clean: rm-dirs := $(CLEAN_DIRS) 1353 clean: rm-files := $(CLEAN_FILES) 1354 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1355 1356 PHONY += $(clean-dirs) clean archclean vmlinuxclean 1357 $(clean-dirs): 1358 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1359 1360 vmlinuxclean: 1361 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1362 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1363 1364 clean: archclean vmlinuxclean 1365 1366 # mrproper - Delete all generated files, including .config 1367 # 1368 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1369 mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1370 mrproper-dirs := $(addprefix _mrproper_,scripts) 1371 1372 PHONY += $(mrproper-dirs) mrproper archmrproper 1373 $(mrproper-dirs): 1374 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1375 1376 mrproper: clean archmrproper $(mrproper-dirs) 1377 $(call cmd,rmdirs) 1378 $(call cmd,rmfiles) 1379 1380 # distclean 1381 # 1382 PHONY += distclean 1383 1384 distclean: mrproper 1385 @find $(srctree) $(RCS_FIND_IGNORE) \ 1386 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1387 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1388 -o -name 'core' \) \ 1389 -type f -print | xargs rm -f 1390 1391 1392 # Packaging of the kernel to various formats 1393 # --------------------------------------------------------------------------- 1394 package-dir := scripts/package 1395 1396 %src-pkg: FORCE 1397 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1398 %pkg: include/config/kernel.release FORCE 1399 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1400 1401 1402 # Brief documentation of the typical targets used 1403 # --------------------------------------------------------------------------- 1404 1405 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1406 boards := $(sort $(notdir $(boards))) 1407 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1408 board-dirs := $(sort $(notdir $(board-dirs:/=))) 1409 1410 PHONY += help 1411 help: 1412 @echo 'Cleaning targets:' 1413 @echo ' clean - Remove most generated files but keep the config and' 1414 @echo ' enough build support to build external modules' 1415 @echo ' mrproper - Remove all generated files + config + various backup files' 1416 @echo ' distclean - mrproper + remove editor backup and patch files' 1417 @echo '' 1418 @echo 'Configuration targets:' 1419 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1420 @echo '' 1421 @echo 'Other generic targets:' 1422 @echo ' all - Build all targets marked with [*]' 1423 @echo '* vmlinux - Build the bare kernel' 1424 @echo '* modules - Build all modules' 1425 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1426 @echo ' dir/ - Build all files in dir and below' 1427 @echo ' dir/file.[ois] - Build specified target only' 1428 @echo ' dir/file.ll - Build the LLVM assembly file' 1429 @echo ' (requires compiler support for LLVM assembly generation)' 1430 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1431 @echo ' (requires a recent binutils and recent build (System.map))' 1432 @echo ' dir/file.ko - Build module including final link' 1433 @echo ' modules_prepare - Set up for building external modules' 1434 @echo ' tags/TAGS - Generate tags file for editors' 1435 @echo ' cscope - Generate cscope index' 1436 @echo ' gtags - Generate GNU GLOBAL index' 1437 @echo ' kernelrelease - Output the release version string (use with make -s)' 1438 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1439 @echo ' image_name - Output the image name (use with make -s)' 1440 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1441 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1442 echo '' 1443 @echo 'Static analysers:' 1444 @echo ' checkstack - Generate a list of stack hogs' 1445 @echo ' namespacecheck - Name space analysis on compiled kernel' 1446 @echo ' versioncheck - Sanity check on version.h usage' 1447 @echo ' includecheck - Check for duplicate included header files' 1448 @echo ' export_report - List the usages of all exported symbols' 1449 @echo ' headers_check - Sanity check on exported headers' 1450 @echo ' headerdep - Detect inclusion cycles in headers' 1451 @echo ' coccicheck - Check with Coccinelle' 1452 @echo '' 1453 @echo 'Kernel selftest:' 1454 @echo ' kselftest - Build and run kernel selftest (run as root)' 1455 @echo ' Build, install, and boot kernel before' 1456 @echo ' running kselftest on it' 1457 @echo ' kselftest-clean - Remove all generated kselftest files' 1458 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1459 @echo ' .config.' 1460 @echo '' 1461 @$(if $(dtstree), \ 1462 echo 'Devicetree:'; \ 1463 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1464 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1465 echo '') 1466 1467 @echo 'Userspace tools targets:' 1468 @echo ' use "make tools/help"' 1469 @echo ' or "cd tools; make help"' 1470 @echo '' 1471 @echo 'Kernel packaging:' 1472 @$(MAKE) $(build)=$(package-dir) help 1473 @echo '' 1474 @echo 'Documentation targets:' 1475 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1476 @echo '' 1477 @echo 'Architecture specific targets ($(SRCARCH)):' 1478 @$(if $(archhelp),$(archhelp),\ 1479 echo ' No architecture specific help defined for $(SRCARCH)') 1480 @echo '' 1481 @$(if $(boards), \ 1482 $(foreach b, $(boards), \ 1483 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1484 echo '') 1485 @$(if $(board-dirs), \ 1486 $(foreach b, $(board-dirs), \ 1487 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1488 printf " %-16s - Show all of the above\\n" help-boards; \ 1489 echo '') 1490 1491 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1492 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1493 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1494 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1495 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1496 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1497 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1498 @echo ' 1: warnings which may be relevant and do not occur too often' 1499 @echo ' 2: warnings which occur quite often but may still be relevant' 1500 @echo ' 3: more obscure warnings, can most likely be ignored' 1501 @echo ' Multiple levels can be combined with W=12 or W=123' 1502 @echo '' 1503 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1504 @echo 'For further info see the ./README file' 1505 1506 1507 help-board-dirs := $(addprefix help-,$(board-dirs)) 1508 1509 help-boards: $(help-board-dirs) 1510 1511 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1512 1513 $(help-board-dirs): help-%: 1514 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1515 @$(if $(boards-per-dir), \ 1516 $(foreach b, $(boards-per-dir), \ 1517 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1518 echo '') 1519 1520 1521 # Documentation targets 1522 # --------------------------------------------------------------------------- 1523 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1524 linkcheckdocs dochelp refcheckdocs 1525 PHONY += $(DOC_TARGETS) 1526 $(DOC_TARGETS): scripts_basic FORCE 1527 $(Q)$(MAKE) $(build)=Documentation $@ 1528 1529 else # KBUILD_EXTMOD 1530 1531 ### 1532 # External module support. 1533 # When building external modules the kernel used as basis is considered 1534 # read-only, and no consistency checks are made and the make 1535 # system is not used on the basis kernel. If updates are required 1536 # in the basis kernel ordinary make commands (without M=...) must 1537 # be used. 1538 # 1539 # The following are the only valid targets when building external 1540 # modules. 1541 # make M=dir clean Delete all automatically generated files 1542 # make M=dir modules Make all modules in specified dir 1543 # make M=dir Same as 'make M=dir modules' 1544 # make M=dir modules_install 1545 # Install the modules built in the module directory 1546 # Assumes install directory is already created 1547 1548 # We are always building modules 1549 KBUILD_MODULES := 1 1550 PHONY += crmodverdir 1551 crmodverdir: 1552 $(cmd_crmodverdir) 1553 1554 PHONY += $(objtree)/Module.symvers 1555 $(objtree)/Module.symvers: 1556 @test -e $(objtree)/Module.symvers || ( \ 1557 echo; \ 1558 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1559 echo " is missing; modules will have no dependencies and modversions."; \ 1560 echo ) 1561 1562 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1563 PHONY += $(module-dirs) modules 1564 $(module-dirs): crmodverdir $(objtree)/Module.symvers 1565 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1566 1567 modules: $(module-dirs) 1568 @$(kecho) ' Building modules, stage 2.'; 1569 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1570 1571 PHONY += modules_install 1572 modules_install: _emodinst_ _emodinst_post 1573 1574 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1575 PHONY += _emodinst_ 1576 _emodinst_: 1577 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1578 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1579 1580 PHONY += _emodinst_post 1581 _emodinst_post: _emodinst_ 1582 $(call cmd,depmod) 1583 1584 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1585 1586 PHONY += $(clean-dirs) clean 1587 $(clean-dirs): 1588 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1589 1590 clean: rm-dirs := $(MODVERDIR) 1591 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1592 1593 PHONY += help 1594 help: 1595 @echo ' Building external modules.' 1596 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1597 @echo '' 1598 @echo ' modules - default target, build the module(s)' 1599 @echo ' modules_install - install the module' 1600 @echo ' clean - remove generated files in module directory only' 1601 @echo '' 1602 1603 # Dummies... 1604 PHONY += prepare scripts 1605 prepare: ; 1606 scripts: ; 1607 endif # KBUILD_EXTMOD 1608 1609 clean: $(clean-dirs) 1610 $(call cmd,rmdirs) 1611 $(call cmd,rmfiles) 1612 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1613 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1614 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1615 -o -name '*.dwo' -o -name '*.lst' \ 1616 -o -name '*.su' \ 1617 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1618 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1619 -o -name '*.asn1.[ch]' \ 1620 -o -name '*.symtypes' -o -name 'modules.order' \ 1621 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1622 -o -name '*.c.[012]*.*' \ 1623 -o -name '*.ll' \ 1624 -o -name '*.gcno' \) -type f -print | xargs rm -f 1625 1626 # Generate tags for editors 1627 # --------------------------------------------------------------------------- 1628 quiet_cmd_tags = GEN $@ 1629 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1630 1631 tags TAGS cscope gtags: FORCE 1632 $(call cmd,tags) 1633 1634 # Scripts to check various things for consistency 1635 # --------------------------------------------------------------------------- 1636 1637 PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1638 1639 includecheck: 1640 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1641 -name '*.[hcS]' -type f -print | sort \ 1642 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1643 1644 versioncheck: 1645 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1646 -name '*.[hcS]' -type f -print | sort \ 1647 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1648 1649 coccicheck: 1650 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1651 1652 namespacecheck: 1653 $(PERL) $(srctree)/scripts/namespace.pl 1654 1655 export_report: 1656 $(PERL) $(srctree)/scripts/export_report.pl 1657 1658 PHONY += checkstack kernelrelease kernelversion image_name 1659 1660 # UML needs a little special treatment here. It wants to use the host 1661 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1662 # else wants $(ARCH), including people doing cross-builds, which means 1663 # that $(SUBARCH) doesn't work here. 1664 ifeq ($(ARCH), um) 1665 CHECKSTACK_ARCH := $(SUBARCH) 1666 else 1667 CHECKSTACK_ARCH := $(ARCH) 1668 endif 1669 checkstack: 1670 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1671 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1672 1673 kernelrelease: 1674 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1675 1676 kernelversion: 1677 @echo $(KERNELVERSION) 1678 1679 image_name: 1680 @echo $(KBUILD_IMAGE) 1681 1682 # Clear a bunch of variables before executing the submake 1683 tools/: FORCE 1684 $(Q)mkdir -p $(objtree)/tools 1685 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1686 1687 tools/%: FORCE 1688 $(Q)mkdir -p $(objtree)/tools 1689 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1690 1691 # Single targets 1692 # --------------------------------------------------------------------------- 1693 # Single targets are compatible with: 1694 # - build with mixed source and output 1695 # - build with separate output dir 'make O=...' 1696 # - external modules 1697 # 1698 # target-dir => where to store outputfile 1699 # build-dir => directory in kernel source tree to use 1700 1701 ifeq ($(KBUILD_EXTMOD),) 1702 build-dir = $(patsubst %/,%,$(dir $@)) 1703 target-dir = $(dir $@) 1704 else 1705 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1706 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1707 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1708 endif 1709 1710 %.s: %.c prepare scripts FORCE 1711 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1712 %.i: %.c prepare scripts FORCE 1713 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1714 %.o: %.c prepare scripts FORCE 1715 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1716 %.lst: %.c prepare scripts FORCE 1717 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1718 %.s: %.S prepare scripts FORCE 1719 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1720 %.o: %.S prepare scripts FORCE 1721 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1722 %.symtypes: %.c prepare scripts FORCE 1723 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1724 %.ll: %.c prepare scripts FORCE 1725 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1726 1727 # Modules 1728 /: prepare scripts FORCE 1729 $(cmd_crmodverdir) 1730 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1731 $(build)=$(build-dir) 1732 # Make sure the latest headers are built for Documentation 1733 Documentation/ samples/: headers_install 1734 %/: prepare scripts FORCE 1735 $(cmd_crmodverdir) 1736 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1737 $(build)=$(build-dir) 1738 %.ko: prepare scripts FORCE 1739 $(cmd_crmodverdir) 1740 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1741 $(build)=$(build-dir) $(@:.ko=.o) 1742 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1743 1744 # FIXME Should go into a make.lib or something 1745 # =========================================================================== 1746 1747 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1748 cmd_rmdirs = rm -rf $(rm-dirs) 1749 1750 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1751 cmd_rmfiles = rm -f $(rm-files) 1752 1753 # Run depmod only if we have System.map and depmod is executable 1754 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1755 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1756 $(KERNELRELEASE) 1757 1758 # Create temporary dir for module support files 1759 # clean it up only when building all modules 1760 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1761 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1762 1763 # read all saved command lines 1764 cmd_files := $(wildcard .*.cmd) 1765 1766 ifneq ($(cmd_files),) 1767 $(cmd_files): ; # Do not try to update included dependency files 1768 include $(cmd_files) 1769 endif 1770 1771 endif # ifeq ($(config-targets),1) 1772 endif # ifeq ($(mixed-targets),1) 1773 endif # skip-makefile 1774 1775 PHONY += FORCE 1776 FORCE: 1777 1778 # Declare the contents of the PHONY variable as phony. We keep that 1779 # information in a variable so we can use it in if_changed and friends. 1780 .PHONY: $(PHONY) 1781