1 VERSION = 4 2 PATCHLEVEL = 5 3 SUBLEVEL = 0 4 EXTRAVERSION = -rc5 5 NAME = Blurry Fish Butt 6 7 # *DOCUMENTATION* 8 # To see a list of typical targets execute "make help" 9 # More info can be located in ./README 10 # Comments in this file are targeted only to the developer, do not 11 # expect to learn how to build the kernel reading this file. 12 13 # o Do not use make's built-in rules and variables 14 # (this increases performance and avoids hard-to-debug behaviour); 15 # o Look for make include files relative to root of kernel src 16 MAKEFLAGS += -rR --include-dir=$(CURDIR) 17 18 # Avoid funny character set dependencies 19 unexport LC_ALL 20 LC_COLLATE=C 21 LC_NUMERIC=C 22 export LC_COLLATE LC_NUMERIC 23 24 # Avoid interference with shell env settings 25 unexport GREP_OPTIONS 26 27 # We are using a recursive build, so we need to do a little thinking 28 # to get the ordering right. 29 # 30 # Most importantly: sub-Makefiles should only ever modify files in 31 # their own directory. If in some directory we have a dependency on 32 # a file in another dir (which doesn't happen often, but it's often 33 # unavoidable when linking the built-in.o targets which finally 34 # turn into vmlinux), we will call a sub make in that other dir, and 35 # after that we are sure that everything which is in that other dir 36 # is now up to date. 37 # 38 # The only cases where we need to modify files which have global 39 # effects are thus separated out and done before the recursive 40 # descending is started. They are now explicitly listed as the 41 # prepare rule. 42 43 # Beautify output 44 # --------------------------------------------------------------------------- 45 # 46 # Normally, we echo the whole command before executing it. By making 47 # that echo $($(quiet)$(cmd)), we now have the possibility to set 48 # $(quiet) to choose other forms of output instead, e.g. 49 # 50 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 51 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 52 # 53 # If $(quiet) is empty, the whole command will be printed. 54 # If it is set to "quiet_", only the short version will be printed. 55 # If it is set to "silent_", nothing will be printed at all, since 56 # the variable $(silent_cmd_cc_o_c) doesn't exist. 57 # 58 # A simple variant is to prefix commands with $(Q) - that's useful 59 # for commands that shall be hidden in non-verbose mode. 60 # 61 # $(Q)ln $@ :< 62 # 63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden. 64 # If KBUILD_VERBOSE equals 1 then the above command is displayed. 65 # 66 # To put more focus on warnings, be less verbose as default 67 # Use 'make V=1' to see the full commands 68 69 ifeq ("$(origin V)", "command line") 70 KBUILD_VERBOSE = $(V) 71 endif 72 ifndef KBUILD_VERBOSE 73 KBUILD_VERBOSE = 0 74 endif 75 76 ifeq ($(KBUILD_VERBOSE),1) 77 quiet = 78 Q = 79 else 80 quiet=quiet_ 81 Q = @ 82 endif 83 84 # If the user is running make -s (silent mode), suppress echoing of 85 # commands 86 87 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 89 quiet=silent_ 90 endif 91 else # make-3.8x 92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 93 quiet=silent_ 94 endif 95 endif 96 97 export quiet Q KBUILD_VERBOSE 98 99 # kbuild supports saving output files in a separate directory. 100 # To locate output files in a separate directory two syntaxes are supported. 101 # In both cases the working directory must be the root of the kernel src. 102 # 1) O= 103 # Use "make O=dir/to/store/output/files/" 104 # 105 # 2) Set KBUILD_OUTPUT 106 # Set the environment variable KBUILD_OUTPUT to point to the directory 107 # where the output files shall be placed. 108 # export KBUILD_OUTPUT=dir/to/store/output/files/ 109 # make 110 # 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment 112 # variable. 113 114 # KBUILD_SRC is set on invocation of make in OBJ directory 115 # KBUILD_SRC is not intended to be used by the regular user (for now) 116 ifeq ($(KBUILD_SRC),) 117 118 # OK, Make called in directory where kernel src resides 119 # Do we want to locate output files in a separate directory? 120 ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122 endif 123 124 # That's our default target when none is given on the command line 125 PHONY := _all 126 _all: 127 128 # Cancel implicit rules on top Makefile 129 $(CURDIR)/Makefile Makefile: ; 130 131 ifneq ($(KBUILD_OUTPUT),) 132 # Invoke a second make in the output directory, passing relevant variables 133 # check that the output directory actually exists 134 saved-output := $(KBUILD_OUTPUT) 135 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 136 && /bin/pwd) 137 $(if $(KBUILD_OUTPUT),, \ 138 $(error failed to create output directory "$(saved-output)")) 139 140 PHONY += $(MAKECMDGOALS) sub-make 141 142 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 143 @: 144 145 sub-make: FORCE 146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 148 149 # Leave processing to above invocation of make 150 skip-makefile := 1 151 endif # ifneq ($(KBUILD_OUTPUT),) 152 endif # ifeq ($(KBUILD_SRC),) 153 154 # We process the rest of the Makefile if this is the final invocation of make 155 ifeq ($(skip-makefile),) 156 157 # Do not print "Entering directory ...", 158 # but we want to display it when entering to the output directory 159 # so that IDEs/editors are able to understand relative filenames. 160 MAKEFLAGS += --no-print-directory 161 162 # Call a source code checker (by default, "sparse") as part of the 163 # C compilation. 164 # 165 # Use 'make C=1' to enable checking of only re-compiled files. 166 # Use 'make C=2' to enable checking of *all* source files, regardless 167 # of whether they are re-compiled or not. 168 # 169 # See the file "Documentation/sparse.txt" for more details, including 170 # where to get the "sparse" utility. 171 172 ifeq ("$(origin C)", "command line") 173 KBUILD_CHECKSRC = $(C) 174 endif 175 ifndef KBUILD_CHECKSRC 176 KBUILD_CHECKSRC = 0 177 endif 178 179 # Use make M=dir to specify directory of external module to build 180 # Old syntax make ... SUBDIRS=$PWD is still supported 181 # Setting the environment variable KBUILD_EXTMOD take precedence 182 ifdef SUBDIRS 183 KBUILD_EXTMOD ?= $(SUBDIRS) 184 endif 185 186 ifeq ("$(origin M)", "command line") 187 KBUILD_EXTMOD := $(M) 188 endif 189 190 # If building an external module we do not care about the all: rule 191 # but instead _all depend on modules 192 PHONY += all 193 ifeq ($(KBUILD_EXTMOD),) 194 _all: all 195 else 196 _all: modules 197 endif 198 199 ifeq ($(KBUILD_SRC),) 200 # building in the source tree 201 srctree := . 202 else 203 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 204 # building in a subdirectory of the source tree 205 srctree := .. 206 else 207 srctree := $(KBUILD_SRC) 208 endif 209 endif 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 # SUBARCH tells the usermode build what the underlying arch is. That is set 219 # first, and if a usermode build is happening, the "ARCH=um" on the command 220 # line overrides the setting of ARCH below. If a native build is happening, 221 # then ARCH is assigned, getting whatever value it gets normally, and 222 # SUBARCH is subsequently ignored. 223 224 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 225 -e s/sun4u/sparc64/ \ 226 -e s/arm.*/arm/ -e s/sa110/arm/ \ 227 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 228 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 229 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 230 231 # Cross compiling and selecting different set of gcc/bin-utils 232 # --------------------------------------------------------------------------- 233 # 234 # When performing cross compilation for other architectures ARCH shall be set 235 # to the target architecture. (See arch/* for the possibilities). 236 # ARCH can be set during invocation of make: 237 # make ARCH=ia64 238 # Another way is to have ARCH set in the environment. 239 # The default ARCH is the host where make is executed. 240 241 # CROSS_COMPILE specify the prefix used for all executables used 242 # during compilation. Only gcc and related bin-utils executables 243 # are prefixed with $(CROSS_COMPILE). 244 # CROSS_COMPILE can be set on the command line 245 # make CROSS_COMPILE=ia64-linux- 246 # Alternatively CROSS_COMPILE can be set in the environment. 247 # A third alternative is to store a setting in .config so that plain 248 # "make" in the configured kernel build directory always uses that. 249 # Default value for CROSS_COMPILE is not to prefix executables 250 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 251 ARCH ?= $(SUBARCH) 252 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 253 254 # Architecture as present in compile.h 255 UTS_MACHINE := $(ARCH) 256 SRCARCH := $(ARCH) 257 258 # Additional ARCH settings for x86 259 ifeq ($(ARCH),i386) 260 SRCARCH := x86 261 endif 262 ifeq ($(ARCH),x86_64) 263 SRCARCH := x86 264 endif 265 266 # Additional ARCH settings for sparc 267 ifeq ($(ARCH),sparc32) 268 SRCARCH := sparc 269 endif 270 ifeq ($(ARCH),sparc64) 271 SRCARCH := sparc 272 endif 273 274 # Additional ARCH settings for sh 275 ifeq ($(ARCH),sh64) 276 SRCARCH := sh 277 endif 278 279 # Additional ARCH settings for tile 280 ifeq ($(ARCH),tilepro) 281 SRCARCH := tile 282 endif 283 ifeq ($(ARCH),tilegx) 284 SRCARCH := tile 285 endif 286 287 # Where to locate arch specific headers 288 hdr-arch := $(SRCARCH) 289 290 KCONFIG_CONFIG ?= .config 291 export KCONFIG_CONFIG 292 293 # SHELL used by kbuild 294 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 295 else if [ -x /bin/bash ]; then echo /bin/bash; \ 296 else echo sh; fi ; fi) 297 298 HOSTCC = gcc 299 HOSTCXX = g++ 300 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89 301 HOSTCXXFLAGS = -O2 302 303 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) 304 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 305 -Wno-missing-field-initializers -fno-delete-null-pointer-checks 306 endif 307 308 # Decide whether to build built-in, modular, or both. 309 # Normally, just do built-in. 310 311 KBUILD_MODULES := 312 KBUILD_BUILTIN := 1 313 314 # If we have only "make modules", don't compile built-in objects. 315 # When we're building modules with modversions, we need to consider 316 # the built-in objects during the descend as well, in order to 317 # make sure the checksums are up to date before we record them. 318 319 ifeq ($(MAKECMDGOALS),modules) 320 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 321 endif 322 323 # If we have "make <whatever> modules", compile modules 324 # in addition to whatever we do anyway. 325 # Just "make" or "make all" shall build modules as well 326 327 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 328 KBUILD_MODULES := 1 329 endif 330 331 ifeq ($(MAKECMDGOALS),) 332 KBUILD_MODULES := 1 333 endif 334 335 export KBUILD_MODULES KBUILD_BUILTIN 336 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 337 338 # We need some generic definitions (do not try to remake the file). 339 scripts/Kbuild.include: ; 340 include scripts/Kbuild.include 341 342 # Make variables (CC, etc...) 343 AS = $(CROSS_COMPILE)as 344 LD = $(CROSS_COMPILE)ld 345 CC = $(CROSS_COMPILE)gcc 346 CPP = $(CC) -E 347 AR = $(CROSS_COMPILE)ar 348 NM = $(CROSS_COMPILE)nm 349 STRIP = $(CROSS_COMPILE)strip 350 OBJCOPY = $(CROSS_COMPILE)objcopy 351 OBJDUMP = $(CROSS_COMPILE)objdump 352 AWK = awk 353 GENKSYMS = scripts/genksyms/genksyms 354 INSTALLKERNEL := installkernel 355 DEPMOD = /sbin/depmod 356 PERL = perl 357 PYTHON = python 358 CHECK = sparse 359 360 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 361 -Wbitwise -Wno-return-void $(CF) 362 CFLAGS_MODULE = 363 AFLAGS_MODULE = 364 LDFLAGS_MODULE = 365 CFLAGS_KERNEL = 366 AFLAGS_KERNEL = 367 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 368 369 370 # Use USERINCLUDE when you must reference the UAPI directories only. 371 USERINCLUDE := \ 372 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 373 -Iarch/$(hdr-arch)/include/generated/uapi \ 374 -I$(srctree)/include/uapi \ 375 -Iinclude/generated/uapi \ 376 -include $(srctree)/include/linux/kconfig.h 377 378 # Use LINUXINCLUDE when you must reference the include/ directory. 379 # Needed to be compatible with the O= option 380 LINUXINCLUDE := \ 381 -I$(srctree)/arch/$(hdr-arch)/include \ 382 -Iarch/$(hdr-arch)/include/generated/uapi \ 383 -Iarch/$(hdr-arch)/include/generated \ 384 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 385 -Iinclude \ 386 $(USERINCLUDE) 387 388 KBUILD_CPPFLAGS := -D__KERNEL__ 389 390 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 391 -fno-strict-aliasing -fno-common \ 392 -Werror-implicit-function-declaration \ 393 -Wno-format-security \ 394 -std=gnu89 395 396 KBUILD_AFLAGS_KERNEL := 397 KBUILD_CFLAGS_KERNEL := 398 KBUILD_AFLAGS := -D__ASSEMBLY__ 399 KBUILD_AFLAGS_MODULE := -DMODULE 400 KBUILD_CFLAGS_MODULE := -DMODULE 401 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 402 403 # Read KERNELRELEASE from include/config/kernel.release (if it exists) 404 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 405 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 406 407 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 408 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 409 export CPP AR NM STRIP OBJCOPY OBJDUMP 410 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 411 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 412 413 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 414 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN CFLAGS_UBSAN 415 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 416 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 417 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 418 export KBUILD_ARFLAGS 419 420 # When compiling out-of-tree modules, put MODVERDIR in the module 421 # tree rather than in the kernel tree. The kernel tree might 422 # even be read-only. 423 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 424 425 # Files to ignore in find ... statements 426 427 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 428 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 429 -prune -o 430 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 431 --exclude CVS --exclude .pc --exclude .hg --exclude .git 432 433 # =========================================================================== 434 # Rules shared between *config targets and build targets 435 436 # Basic helpers built in scripts/ 437 PHONY += scripts_basic 438 scripts_basic: 439 $(Q)$(MAKE) $(build)=scripts/basic 440 $(Q)rm -f .tmp_quiet_recordmcount 441 442 # To avoid any implicit rule to kick in, define an empty command. 443 scripts/basic/%: scripts_basic ; 444 445 PHONY += outputmakefile 446 # outputmakefile generates a Makefile in the output directory, if using a 447 # separate output directory. This allows convenient use of make in the 448 # output directory. 449 outputmakefile: 450 ifneq ($(KBUILD_SRC),) 451 $(Q)ln -fsn $(srctree) source 452 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 453 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 454 endif 455 456 # Support for using generic headers in asm-generic 457 PHONY += asm-generic 458 asm-generic: 459 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 460 src=asm obj=arch/$(SRCARCH)/include/generated/asm 461 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 462 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 463 464 # To make sure we do not include .config for any of the *config targets 465 # catch them early, and hand them over to scripts/kconfig/Makefile 466 # It is allowed to specify more targets when calling make, including 467 # mixing *config targets and build targets. 468 # For example 'make oldconfig all'. 469 # Detect when mixed targets is specified, and make a second invocation 470 # of make so .config is not included in this case either (for *config). 471 472 version_h := include/generated/uapi/linux/version.h 473 old_version_h := include/linux/version.h 474 475 no-dot-config-targets := clean mrproper distclean \ 476 cscope gtags TAGS tags help% %docs check% coccicheck \ 477 $(version_h) headers_% archheaders archscripts \ 478 kernelversion %src-pkg 479 480 config-targets := 0 481 mixed-targets := 0 482 dot-config := 1 483 484 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 485 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 486 dot-config := 0 487 endif 488 endif 489 490 ifeq ($(KBUILD_EXTMOD),) 491 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 492 config-targets := 1 493 ifneq ($(words $(MAKECMDGOALS)),1) 494 mixed-targets := 1 495 endif 496 endif 497 endif 498 # install and module_install need also be processed one by one 499 ifneq ($(filter install,$(MAKECMDGOALS)),) 500 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 501 mixed-targets := 1 502 endif 503 endif 504 505 ifeq ($(mixed-targets),1) 506 # =========================================================================== 507 # We're called with mixed targets (*config and build targets). 508 # Handle them one by one. 509 510 PHONY += $(MAKECMDGOALS) __build_one_by_one 511 512 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 513 @: 514 515 __build_one_by_one: 516 $(Q)set -e; \ 517 for i in $(MAKECMDGOALS); do \ 518 $(MAKE) -f $(srctree)/Makefile $$i; \ 519 done 520 521 else 522 ifeq ($(config-targets),1) 523 # =========================================================================== 524 # *config targets only - make sure prerequisites are updated, and descend 525 # in scripts/kconfig to make the *config target 526 527 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 528 # KBUILD_DEFCONFIG may point out an alternative default configuration 529 # used for 'make defconfig' 530 include arch/$(SRCARCH)/Makefile 531 export KBUILD_DEFCONFIG KBUILD_KCONFIG 532 533 config: scripts_basic outputmakefile FORCE 534 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 535 536 %config: scripts_basic outputmakefile FORCE 537 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 538 539 else 540 # =========================================================================== 541 # Build targets only - this includes vmlinux, arch specific targets, clean 542 # targets and others. In general all targets except *config targets. 543 544 ifeq ($(KBUILD_EXTMOD),) 545 # Additional helpers built in scripts/ 546 # Carefully list dependencies so we do not try to build scripts twice 547 # in parallel 548 PHONY += scripts 549 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 550 asm-generic 551 $(Q)$(MAKE) $(build)=$(@) 552 553 # Objects we will link into vmlinux / subdirs we need to visit 554 init-y := init/ 555 drivers-y := drivers/ sound/ firmware/ 556 net-y := net/ 557 libs-y := lib/ 558 core-y := usr/ 559 virt-y := virt/ 560 endif # KBUILD_EXTMOD 561 562 ifeq ($(dot-config),1) 563 # Read in config 564 -include include/config/auto.conf 565 566 ifeq ($(KBUILD_EXTMOD),) 567 # Read in dependencies to all Kconfig* files, make sure to run 568 # oldconfig if changes are detected. 569 -include include/config/auto.conf.cmd 570 571 # To avoid any implicit rule to kick in, define an empty command 572 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 573 574 # If .config is newer than include/config/auto.conf, someone tinkered 575 # with it and forgot to run make oldconfig. 576 # if auto.conf.cmd is missing then we are probably in a cleaned tree so 577 # we execute the config step to be sure to catch updated Kconfig files 578 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 579 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 580 else 581 # external modules needs include/generated/autoconf.h and include/config/auto.conf 582 # but do not care if they are up-to-date. Use auto.conf to trigger the test 583 PHONY += include/config/auto.conf 584 585 include/config/auto.conf: 586 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 587 echo >&2; \ 588 echo >&2 " ERROR: Kernel configuration is invalid."; \ 589 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 590 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 591 echo >&2 ; \ 592 /bin/false) 593 594 endif # KBUILD_EXTMOD 595 596 else 597 # Dummy target needed, because used as prerequisite 598 include/config/auto.conf: ; 599 endif # $(dot-config) 600 601 # The all: target is the default when no target is given on the 602 # command line. 603 # This allow a user to issue only 'make' to build a kernel including modules 604 # Defaults to vmlinux, but the arch makefile usually adds further targets 605 all: vmlinux 606 607 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 608 # values of the respective KBUILD_* variables 609 ARCH_CPPFLAGS := 610 ARCH_AFLAGS := 611 ARCH_CFLAGS := 612 include arch/$(SRCARCH)/Makefile 613 614 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 615 616 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 617 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 618 else 619 KBUILD_CFLAGS += -O2 620 endif 621 622 # Tell gcc to never replace conditional load with a non-conditional one 623 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 624 625 ifdef CONFIG_READABLE_ASM 626 # Disable optimizations that make assembler listings hard to read. 627 # reorder blocks reorders the control in the function 628 # ipa clone creates specialized cloned functions 629 # partial inlining inlines only parts of functions 630 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 631 $(call cc-option,-fno-ipa-cp-clone,) \ 632 $(call cc-option,-fno-partial-inlining) 633 endif 634 635 ifneq ($(CONFIG_FRAME_WARN),0) 636 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 637 endif 638 639 # Handle stack protector mode. 640 # 641 # Since kbuild can potentially perform two passes (first with the old 642 # .config values and then with updated .config values), we cannot error out 643 # if a desired compiler option is unsupported. If we were to error, kbuild 644 # could never get to the second pass and actually notice that we changed 645 # the option to something that was supported. 646 # 647 # Additionally, we don't want to fallback and/or silently change which compiler 648 # flags will be used, since that leads to producing kernels with different 649 # security feature characteristics depending on the compiler used. ("But I 650 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 651 # 652 # The middle ground is to warn here so that the failed option is obvious, but 653 # to let the build fail with bad compiler flags so that we can't produce a 654 # kernel when there is a CONFIG and compiler mismatch. 655 # 656 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 657 stackp-flag := -fstack-protector 658 ifeq ($(call cc-option, $(stackp-flag)),) 659 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 660 -fstack-protector not supported by compiler) 661 endif 662 else 663 ifdef CONFIG_CC_STACKPROTECTOR_STRONG 664 stackp-flag := -fstack-protector-strong 665 ifeq ($(call cc-option, $(stackp-flag)),) 666 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 667 -fstack-protector-strong not supported by compiler) 668 endif 669 else 670 # Force off for distro compilers that enable stack protector by default. 671 stackp-flag := $(call cc-option, -fno-stack-protector) 672 endif 673 endif 674 KBUILD_CFLAGS += $(stackp-flag) 675 676 ifeq ($(cc-name),clang) 677 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 678 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) 679 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 680 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 681 KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 682 # Quiet clang warning: comparison of unsigned expression < 0 is always false 683 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 684 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 685 # source of a reference will be _MergedGlobals and not on of the whitelisted names. 686 # See modpost pattern 2 687 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 688 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 689 else 690 691 # This warning generated too much noise in a regular build. 692 # Use make W=1 to enable this warning (see scripts/Makefile.build) 693 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 694 endif 695 696 ifdef CONFIG_FRAME_POINTER 697 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 698 else 699 # Some targets (ARM with Thumb2, for example), can't be built with frame 700 # pointers. For those, we don't have FUNCTION_TRACER automatically 701 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 702 # incompatible with -fomit-frame-pointer with current GCC, so we don't use 703 # -fomit-frame-pointer with FUNCTION_TRACER. 704 ifndef CONFIG_FUNCTION_TRACER 705 KBUILD_CFLAGS += -fomit-frame-pointer 706 endif 707 endif 708 709 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 710 711 ifdef CONFIG_DEBUG_INFO 712 ifdef CONFIG_DEBUG_INFO_SPLIT 713 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 714 else 715 KBUILD_CFLAGS += -g 716 endif 717 KBUILD_AFLAGS += -Wa,-gdwarf-2 718 endif 719 ifdef CONFIG_DEBUG_INFO_DWARF4 720 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 721 endif 722 723 ifdef CONFIG_DEBUG_INFO_REDUCED 724 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 725 $(call cc-option,-fno-var-tracking) 726 endif 727 728 ifdef CONFIG_FUNCTION_TRACER 729 ifndef CC_FLAGS_FTRACE 730 CC_FLAGS_FTRACE := -pg 731 endif 732 export CC_FLAGS_FTRACE 733 ifdef CONFIG_HAVE_FENTRY 734 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 735 endif 736 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 737 KBUILD_AFLAGS += $(CC_USING_FENTRY) 738 ifdef CONFIG_DYNAMIC_FTRACE 739 ifdef CONFIG_HAVE_C_RECORDMCOUNT 740 BUILD_C_RECORDMCOUNT := y 741 export BUILD_C_RECORDMCOUNT 742 endif 743 endif 744 endif 745 746 # We trigger additional mismatches with less inlining 747 ifdef CONFIG_DEBUG_SECTION_MISMATCH 748 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 749 endif 750 751 # arch Makefile may override CC so keep this after arch Makefile is included 752 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 753 CHECKFLAGS += $(NOSTDINC_FLAGS) 754 755 # warn about C99 declaration after statement 756 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 757 758 # disable pointer signed / unsigned warnings in gcc 4.0 759 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 760 761 # disable invalid "can't wrap" optimizations for signed / pointers 762 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 763 764 # conserve stack if available 765 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 766 767 # disallow errors like 'EXPORT_GPL(foo);' with missing header 768 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 769 770 # require functions to have arguments in prototypes, not empty 'int foo()' 771 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 772 773 # Prohibit date/time macros, which would make the build non-deterministic 774 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 775 776 # use the deterministic mode of AR if available 777 KBUILD_ARFLAGS := $(call ar-option,D) 778 779 # check for 'asm goto' 780 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 781 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 782 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 783 endif 784 785 include scripts/Makefile.kasan 786 include scripts/Makefile.extrawarn 787 include scripts/Makefile.ubsan 788 789 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 790 # last assignments 791 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 792 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 793 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 794 795 # Use --build-id when available. 796 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 797 $(call cc-ldoption, -Wl$(comma)--build-id,)) 798 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 799 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 800 801 ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 802 LDFLAGS_vmlinux += $(call ld-option, -X,) 803 endif 804 805 # Default kernel image to build when no specific target is given. 806 # KBUILD_IMAGE may be overruled on the command line or 807 # set in the environment 808 # Also any assignments in arch/$(ARCH)/Makefile take precedence over 809 # this default value 810 export KBUILD_IMAGE ?= vmlinux 811 812 # 813 # INSTALL_PATH specifies where to place the updated kernel and system map 814 # images. Default is /boot, but you can set it to other values 815 export INSTALL_PATH ?= /boot 816 817 # 818 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 819 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 820 # an argument if needed. Otherwise it defaults to the kernel install path 821 # 822 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 823 824 # 825 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 826 # relocations required by build roots. This is not defined in the 827 # makefile but the argument can be passed to make if needed. 828 # 829 830 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 831 export MODLIB 832 833 # 834 # INSTALL_MOD_STRIP, if defined, will cause modules to be 835 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 836 # the default option --strip-debug will be used. Otherwise, 837 # INSTALL_MOD_STRIP value will be used as the options to the strip command. 838 839 ifdef INSTALL_MOD_STRIP 840 ifeq ($(INSTALL_MOD_STRIP),1) 841 mod_strip_cmd = $(STRIP) --strip-debug 842 else 843 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 844 endif # INSTALL_MOD_STRIP=1 845 else 846 mod_strip_cmd = true 847 endif # INSTALL_MOD_STRIP 848 export mod_strip_cmd 849 850 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 851 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 852 # or CONFIG_MODULE_COMPRESS_XZ. 853 854 mod_compress_cmd = true 855 ifdef CONFIG_MODULE_COMPRESS 856 ifdef CONFIG_MODULE_COMPRESS_GZIP 857 mod_compress_cmd = gzip -n -f 858 endif # CONFIG_MODULE_COMPRESS_GZIP 859 ifdef CONFIG_MODULE_COMPRESS_XZ 860 mod_compress_cmd = xz -f 861 endif # CONFIG_MODULE_COMPRESS_XZ 862 endif # CONFIG_MODULE_COMPRESS 863 export mod_compress_cmd 864 865 # Select initial ramdisk compression format, default is gzip(1). 866 # This shall be used by the dracut(8) tool while creating an initramfs image. 867 # 868 INITRD_COMPRESS-y := gzip 869 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 870 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 871 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 872 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 873 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 874 # do not export INITRD_COMPRESS, since we didn't actually 875 # choose a sane default compression above. 876 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 877 878 ifdef CONFIG_MODULE_SIG_ALL 879 $(eval $(call config_filename,MODULE_SIG_KEY)) 880 881 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 882 else 883 mod_sign_cmd = true 884 endif 885 export mod_sign_cmd 886 887 888 ifeq ($(KBUILD_EXTMOD),) 889 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 890 891 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 892 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 893 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 894 895 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 896 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 897 898 init-y := $(patsubst %/, %/built-in.o, $(init-y)) 899 core-y := $(patsubst %/, %/built-in.o, $(core-y)) 900 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 901 net-y := $(patsubst %/, %/built-in.o, $(net-y)) 902 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 903 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 904 libs-y := $(libs-y1) $(libs-y2) 905 virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 906 907 # Externally visible symbols (used by link-vmlinux.sh) 908 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 909 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y) 910 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 911 export LDFLAGS_vmlinux 912 # used by scripts/pacmage/Makefile 913 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 914 915 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 916 917 # Final link of vmlinux 918 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 919 quiet_cmd_link-vmlinux = LINK $@ 920 921 # Include targets which we want to 922 # execute if the rest of the kernel build went well. 923 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 924 ifdef CONFIG_HEADERS_CHECK 925 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 926 endif 927 ifdef CONFIG_SAMPLES 928 $(Q)$(MAKE) $(build)=samples 929 endif 930 ifdef CONFIG_BUILD_DOCSRC 931 $(Q)$(MAKE) $(build)=Documentation 932 endif 933 ifdef CONFIG_GDB_SCRIPTS 934 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py 935 endif 936 +$(call if_changed,link-vmlinux) 937 938 # The actual objects are generated when descending, 939 # make sure no implicit rule kicks in 940 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 941 942 # Handle descending into subdirectories listed in $(vmlinux-dirs) 943 # Preset locale variables to speed up the build process. Limit locale 944 # tweaks to this spot to avoid wrong language settings when running 945 # make menuconfig etc. 946 # Error messages still appears in the original language 947 948 PHONY += $(vmlinux-dirs) 949 $(vmlinux-dirs): prepare scripts 950 $(Q)$(MAKE) $(build)=$@ 951 952 define filechk_kernel.release 953 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 954 endef 955 956 # Store (new) KERNELRELEASE string in include/config/kernel.release 957 include/config/kernel.release: include/config/auto.conf FORCE 958 $(call filechk,kernel.release) 959 960 961 # Things we need to do before we recursively start building the kernel 962 # or the modules are listed in "prepare". 963 # A multi level approach is used. prepareN is processed before prepareN-1. 964 # archprepare is used in arch Makefiles and when processed asm symlink, 965 # version.h and scripts_basic is processed / created. 966 967 # Listed in dependency order 968 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 969 970 # prepare3 is used to check if we are building in a separate output directory, 971 # and if so do: 972 # 1) Check that make has not been executed in the kernel src $(srctree) 973 prepare3: include/config/kernel.release 974 ifneq ($(KBUILD_SRC),) 975 @$(kecho) ' Using $(srctree) as source for kernel' 976 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 977 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 978 echo >&2 " in the '$(srctree)' directory.";\ 979 /bin/false; \ 980 fi; 981 endif 982 983 # prepare2 creates a makefile if using a separate output directory 984 prepare2: prepare3 outputmakefile asm-generic 985 986 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 987 include/config/auto.conf 988 $(cmd_crmodverdir) 989 990 archprepare: archheaders archscripts prepare1 scripts_basic 991 992 prepare0: archprepare FORCE 993 $(Q)$(MAKE) $(build)=. 994 995 # All the preparing.. 996 prepare: prepare0 997 998 # Generate some files 999 # --------------------------------------------------------------------------- 1000 1001 # KERNELRELEASE can change from a few different places, meaning version.h 1002 # needs to be updated, so this check is forced on all builds 1003 1004 uts_len := 64 1005 define filechk_utsrelease.h 1006 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1007 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1008 exit 1; \ 1009 fi; \ 1010 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1011 endef 1012 1013 define filechk_version.h 1014 (echo \#define LINUX_VERSION_CODE $(shell \ 1015 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1016 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1017 endef 1018 1019 $(version_h): $(srctree)/Makefile FORCE 1020 $(call filechk,version.h) 1021 $(Q)rm -f $(old_version_h) 1022 1023 include/generated/utsrelease.h: include/config/kernel.release FORCE 1024 $(call filechk,utsrelease.h) 1025 1026 PHONY += headerdep 1027 headerdep: 1028 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1029 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1030 1031 # --------------------------------------------------------------------------- 1032 # Firmware install 1033 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1034 export INSTALL_FW_PATH 1035 1036 PHONY += firmware_install 1037 firmware_install: FORCE 1038 @mkdir -p $(objtree)/firmware 1039 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1040 1041 # --------------------------------------------------------------------------- 1042 # Kernel headers 1043 1044 #Default location for installed headers 1045 export INSTALL_HDR_PATH = $(objtree)/usr 1046 1047 # If we do an all arch process set dst to asm-$(hdr-arch) 1048 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1049 1050 PHONY += archheaders 1051 archheaders: 1052 1053 PHONY += archscripts 1054 archscripts: 1055 1056 PHONY += __headers 1057 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 1058 $(Q)$(MAKE) $(build)=scripts build_unifdef 1059 1060 PHONY += headers_install_all 1061 headers_install_all: 1062 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1063 1064 PHONY += headers_install 1065 headers_install: __headers 1066 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1067 $(error Headers not exportable for the $(SRCARCH) architecture)) 1068 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1069 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 1070 1071 PHONY += headers_check_all 1072 headers_check_all: headers_install_all 1073 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1074 1075 PHONY += headers_check 1076 headers_check: headers_install 1077 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1078 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 1079 1080 # --------------------------------------------------------------------------- 1081 # Kernel selftest 1082 1083 PHONY += kselftest 1084 kselftest: 1085 $(Q)$(MAKE) -C tools/testing/selftests run_tests 1086 1087 kselftest-clean: 1088 $(Q)$(MAKE) -C tools/testing/selftests clean 1089 1090 # --------------------------------------------------------------------------- 1091 # Modules 1092 1093 ifdef CONFIG_MODULES 1094 1095 # By default, build modules as well 1096 1097 all: modules 1098 1099 # Build modules 1100 # 1101 # A module can be listed more than once in obj-m resulting in 1102 # duplicate lines in modules.order files. Those are removed 1103 # using awk while concatenating to the final file. 1104 1105 PHONY += modules 1106 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1107 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1108 @$(kecho) ' Building modules, stage 2.'; 1109 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1110 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1111 1112 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1113 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1114 1115 %/modules.builtin: include/config/auto.conf 1116 $(Q)$(MAKE) $(modbuiltin)=$* 1117 1118 1119 # Target to prepare building external modules 1120 PHONY += modules_prepare 1121 modules_prepare: prepare scripts 1122 1123 # Target to install modules 1124 PHONY += modules_install 1125 modules_install: _modinst_ _modinst_post 1126 1127 PHONY += _modinst_ 1128 _modinst_: 1129 @rm -rf $(MODLIB)/kernel 1130 @rm -f $(MODLIB)/source 1131 @mkdir -p $(MODLIB)/kernel 1132 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1133 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1134 rm -f $(MODLIB)/build ; \ 1135 ln -s $(CURDIR) $(MODLIB)/build ; \ 1136 fi 1137 @cp -f $(objtree)/modules.order $(MODLIB)/ 1138 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1139 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1140 1141 # This depmod is only for convenience to give the initial 1142 # boot a modules.dep even before / is mounted read-write. However the 1143 # boot script depmod is the master version. 1144 PHONY += _modinst_post 1145 _modinst_post: _modinst_ 1146 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1147 $(call cmd,depmod) 1148 1149 ifeq ($(CONFIG_MODULE_SIG), y) 1150 PHONY += modules_sign 1151 modules_sign: 1152 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1153 endif 1154 1155 else # CONFIG_MODULES 1156 1157 # Modules not configured 1158 # --------------------------------------------------------------------------- 1159 1160 modules modules_install: FORCE 1161 @echo >&2 1162 @echo >&2 "The present kernel configuration has modules disabled." 1163 @echo >&2 "Type 'make config' and enable loadable module support." 1164 @echo >&2 "Then build a kernel with module support enabled." 1165 @echo >&2 1166 @exit 1 1167 1168 endif # CONFIG_MODULES 1169 1170 ### 1171 # Cleaning is done on three levels. 1172 # make clean Delete most generated files 1173 # Leave enough to build external modules 1174 # make mrproper Delete the current configuration, and all generated files 1175 # make distclean Remove editor backup files, patch leftover files and the like 1176 1177 # Directories & files removed with 'make clean' 1178 CLEAN_DIRS += $(MODVERDIR) 1179 1180 # Directories & files removed with 'make mrproper' 1181 MRPROPER_DIRS += include/config usr/include include/generated \ 1182 arch/*/include/generated .tmp_objdiff 1183 MRPROPER_FILES += .config .config.old .version .old_version \ 1184 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1185 signing_key.pem signing_key.priv signing_key.x509 \ 1186 x509.genkey extra_certificates signing_key.x509.keyid \ 1187 signing_key.x509.signer vmlinux-gdb.py 1188 1189 # clean - Delete most, but leave enough to build external modules 1190 # 1191 clean: rm-dirs := $(CLEAN_DIRS) 1192 clean: rm-files := $(CLEAN_FILES) 1193 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1194 1195 PHONY += $(clean-dirs) clean archclean vmlinuxclean 1196 $(clean-dirs): 1197 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1198 1199 vmlinuxclean: 1200 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1201 1202 clean: archclean vmlinuxclean 1203 1204 # mrproper - Delete all generated files, including .config 1205 # 1206 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1207 mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1208 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1209 1210 PHONY += $(mrproper-dirs) mrproper archmrproper 1211 $(mrproper-dirs): 1212 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1213 1214 mrproper: clean archmrproper $(mrproper-dirs) 1215 $(call cmd,rmdirs) 1216 $(call cmd,rmfiles) 1217 1218 # distclean 1219 # 1220 PHONY += distclean 1221 1222 distclean: mrproper 1223 @find $(srctree) $(RCS_FIND_IGNORE) \ 1224 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1225 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1226 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \ 1227 -type f -print | xargs rm -f 1228 1229 1230 # Packaging of the kernel to various formats 1231 # --------------------------------------------------------------------------- 1232 # rpm target kept for backward compatibility 1233 package-dir := scripts/package 1234 1235 %src-pkg: FORCE 1236 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1237 %pkg: include/config/kernel.release FORCE 1238 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1239 rpm: include/config/kernel.release FORCE 1240 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1241 1242 1243 # Brief documentation of the typical targets used 1244 # --------------------------------------------------------------------------- 1245 1246 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1247 boards := $(sort $(notdir $(boards))) 1248 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1249 board-dirs := $(sort $(notdir $(board-dirs:/=))) 1250 1251 help: 1252 @echo 'Cleaning targets:' 1253 @echo ' clean - Remove most generated files but keep the config and' 1254 @echo ' enough build support to build external modules' 1255 @echo ' mrproper - Remove all generated files + config + various backup files' 1256 @echo ' distclean - mrproper + remove editor backup and patch files' 1257 @echo '' 1258 @echo 'Configuration targets:' 1259 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1260 @echo '' 1261 @echo 'Other generic targets:' 1262 @echo ' all - Build all targets marked with [*]' 1263 @echo '* vmlinux - Build the bare kernel' 1264 @echo '* modules - Build all modules' 1265 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1266 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1267 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1268 @echo ' dir/ - Build all files in dir and below' 1269 @echo ' dir/file.[ois] - Build specified target only' 1270 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1271 @echo ' (requires a recent binutils and recent build (System.map))' 1272 @echo ' dir/file.ko - Build module including final link' 1273 @echo ' modules_prepare - Set up for building external modules' 1274 @echo ' tags/TAGS - Generate tags file for editors' 1275 @echo ' cscope - Generate cscope index' 1276 @echo ' gtags - Generate GNU GLOBAL index' 1277 @echo ' kernelrelease - Output the release version string (use with make -s)' 1278 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1279 @echo ' image_name - Output the image name (use with make -s)' 1280 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1281 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1282 echo '' 1283 @echo 'Static analysers' 1284 @echo ' checkstack - Generate a list of stack hogs' 1285 @echo ' namespacecheck - Name space analysis on compiled kernel' 1286 @echo ' versioncheck - Sanity check on version.h usage' 1287 @echo ' includecheck - Check for duplicate included header files' 1288 @echo ' export_report - List the usages of all exported symbols' 1289 @echo ' headers_check - Sanity check on exported headers' 1290 @echo ' headerdep - Detect inclusion cycles in headers' 1291 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1292 @echo '' 1293 @echo 'Kernel selftest' 1294 @echo ' kselftest - Build and run kernel selftest (run as root)' 1295 @echo ' Build, install, and boot kernel before' 1296 @echo ' running kselftest on it' 1297 @echo ' kselftest-clean - Remove all generated kselftest files' 1298 @echo '' 1299 @echo 'Kernel packaging:' 1300 @$(MAKE) $(build)=$(package-dir) help 1301 @echo '' 1302 @echo 'Documentation targets:' 1303 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1304 @echo '' 1305 @echo 'Architecture specific targets ($(SRCARCH)):' 1306 @$(if $(archhelp),$(archhelp),\ 1307 echo ' No architecture specific help defined for $(SRCARCH)') 1308 @echo '' 1309 @$(if $(boards), \ 1310 $(foreach b, $(boards), \ 1311 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1312 echo '') 1313 @$(if $(board-dirs), \ 1314 $(foreach b, $(board-dirs), \ 1315 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1316 printf " %-16s - Show all of the above\\n" help-boards; \ 1317 echo '') 1318 1319 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1320 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1321 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1322 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1323 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1324 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1325 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1326 @echo ' 1: warnings which may be relevant and do not occur too often' 1327 @echo ' 2: warnings which occur quite often but may still be relevant' 1328 @echo ' 3: more obscure warnings, can most likely be ignored' 1329 @echo ' Multiple levels can be combined with W=12 or W=123' 1330 @echo '' 1331 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1332 @echo 'For further info see the ./README file' 1333 1334 1335 help-board-dirs := $(addprefix help-,$(board-dirs)) 1336 1337 help-boards: $(help-board-dirs) 1338 1339 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1340 1341 $(help-board-dirs): help-%: 1342 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1343 @$(if $(boards-per-dir), \ 1344 $(foreach b, $(boards-per-dir), \ 1345 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1346 echo '') 1347 1348 1349 # Documentation targets 1350 # --------------------------------------------------------------------------- 1351 %docs: scripts_basic FORCE 1352 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype 1353 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1354 1355 else # KBUILD_EXTMOD 1356 1357 ### 1358 # External module support. 1359 # When building external modules the kernel used as basis is considered 1360 # read-only, and no consistency checks are made and the make 1361 # system is not used on the basis kernel. If updates are required 1362 # in the basis kernel ordinary make commands (without M=...) must 1363 # be used. 1364 # 1365 # The following are the only valid targets when building external 1366 # modules. 1367 # make M=dir clean Delete all automatically generated files 1368 # make M=dir modules Make all modules in specified dir 1369 # make M=dir Same as 'make M=dir modules' 1370 # make M=dir modules_install 1371 # Install the modules built in the module directory 1372 # Assumes install directory is already created 1373 1374 # We are always building modules 1375 KBUILD_MODULES := 1 1376 PHONY += crmodverdir 1377 crmodverdir: 1378 $(cmd_crmodverdir) 1379 1380 PHONY += $(objtree)/Module.symvers 1381 $(objtree)/Module.symvers: 1382 @test -e $(objtree)/Module.symvers || ( \ 1383 echo; \ 1384 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1385 echo " is missing; modules will have no dependencies and modversions."; \ 1386 echo ) 1387 1388 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1389 PHONY += $(module-dirs) modules 1390 $(module-dirs): crmodverdir $(objtree)/Module.symvers 1391 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1392 1393 modules: $(module-dirs) 1394 @$(kecho) ' Building modules, stage 2.'; 1395 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1396 1397 PHONY += modules_install 1398 modules_install: _emodinst_ _emodinst_post 1399 1400 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1401 PHONY += _emodinst_ 1402 _emodinst_: 1403 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1404 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1405 1406 PHONY += _emodinst_post 1407 _emodinst_post: _emodinst_ 1408 $(call cmd,depmod) 1409 1410 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1411 1412 PHONY += $(clean-dirs) clean 1413 $(clean-dirs): 1414 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1415 1416 clean: rm-dirs := $(MODVERDIR) 1417 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1418 1419 help: 1420 @echo ' Building external modules.' 1421 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1422 @echo '' 1423 @echo ' modules - default target, build the module(s)' 1424 @echo ' modules_install - install the module' 1425 @echo ' clean - remove generated files in module directory only' 1426 @echo '' 1427 1428 # Dummies... 1429 PHONY += prepare scripts 1430 prepare: ; 1431 scripts: ; 1432 endif # KBUILD_EXTMOD 1433 1434 clean: $(clean-dirs) 1435 $(call cmd,rmdirs) 1436 $(call cmd,rmfiles) 1437 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1438 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1439 -o -name '*.ko.*' \ 1440 -o -name '*.dwo' \ 1441 -o -name '*.su' \ 1442 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1443 -o -name '*.symtypes' -o -name 'modules.order' \ 1444 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1445 -o -name '*.gcno' \) -type f -print | xargs rm -f 1446 1447 # Generate tags for editors 1448 # --------------------------------------------------------------------------- 1449 quiet_cmd_tags = GEN $@ 1450 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1451 1452 tags TAGS cscope gtags: FORCE 1453 $(call cmd,tags) 1454 1455 # Scripts to check various things for consistency 1456 # --------------------------------------------------------------------------- 1457 1458 PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1459 1460 includecheck: 1461 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1462 -name '*.[hcS]' -type f -print | sort \ 1463 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1464 1465 versioncheck: 1466 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1467 -name '*.[hcS]' -type f -print | sort \ 1468 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1469 1470 coccicheck: 1471 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1472 1473 namespacecheck: 1474 $(PERL) $(srctree)/scripts/namespace.pl 1475 1476 export_report: 1477 $(PERL) $(srctree)/scripts/export_report.pl 1478 1479 endif #ifeq ($(config-targets),1) 1480 endif #ifeq ($(mixed-targets),1) 1481 1482 PHONY += checkstack kernelrelease kernelversion image_name 1483 1484 # UML needs a little special treatment here. It wants to use the host 1485 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1486 # else wants $(ARCH), including people doing cross-builds, which means 1487 # that $(SUBARCH) doesn't work here. 1488 ifeq ($(ARCH), um) 1489 CHECKSTACK_ARCH := $(SUBARCH) 1490 else 1491 CHECKSTACK_ARCH := $(ARCH) 1492 endif 1493 checkstack: 1494 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1495 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1496 1497 kernelrelease: 1498 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1499 1500 kernelversion: 1501 @echo $(KERNELVERSION) 1502 1503 image_name: 1504 @echo $(KBUILD_IMAGE) 1505 1506 # Clear a bunch of variables before executing the submake 1507 tools/: FORCE 1508 $(Q)mkdir -p $(objtree)/tools 1509 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ 1510 1511 tools/%: FORCE 1512 $(Q)mkdir -p $(objtree)/tools 1513 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ $* 1514 1515 # Single targets 1516 # --------------------------------------------------------------------------- 1517 # Single targets are compatible with: 1518 # - build with mixed source and output 1519 # - build with separate output dir 'make O=...' 1520 # - external modules 1521 # 1522 # target-dir => where to store outputfile 1523 # build-dir => directory in kernel source tree to use 1524 1525 ifeq ($(KBUILD_EXTMOD),) 1526 build-dir = $(patsubst %/,%,$(dir $@)) 1527 target-dir = $(dir $@) 1528 else 1529 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1530 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1531 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1532 endif 1533 1534 %.s: %.c prepare scripts FORCE 1535 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1536 %.i: %.c prepare scripts FORCE 1537 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1538 %.o: %.c prepare scripts FORCE 1539 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1540 %.lst: %.c prepare scripts FORCE 1541 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1542 %.s: %.S prepare scripts FORCE 1543 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1544 %.o: %.S prepare scripts FORCE 1545 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1546 %.symtypes: %.c prepare scripts FORCE 1547 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1548 1549 # Modules 1550 /: prepare scripts FORCE 1551 $(cmd_crmodverdir) 1552 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1553 $(build)=$(build-dir) 1554 # Make sure the latest headers are built for Documentation 1555 Documentation/: headers_install 1556 %/: prepare scripts FORCE 1557 $(cmd_crmodverdir) 1558 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1559 $(build)=$(build-dir) 1560 %.ko: prepare scripts FORCE 1561 $(cmd_crmodverdir) 1562 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1563 $(build)=$(build-dir) $(@:.ko=.o) 1564 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1565 1566 # FIXME Should go into a make.lib or something 1567 # =========================================================================== 1568 1569 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1570 cmd_rmdirs = rm -rf $(rm-dirs) 1571 1572 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1573 cmd_rmfiles = rm -f $(rm-files) 1574 1575 # Run depmod only if we have System.map and depmod is executable 1576 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1577 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1578 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1579 1580 # Create temporary dir for module support files 1581 # clean it up only when building all modules 1582 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1583 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1584 1585 # read all saved command lines 1586 1587 targets := $(wildcard $(sort $(targets))) 1588 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1589 1590 ifneq ($(cmd_files),) 1591 $(cmd_files): ; # Do not try to update included dependency files 1592 include $(cmd_files) 1593 endif 1594 1595 endif # skip-makefile 1596 1597 PHONY += FORCE 1598 FORCE: 1599 1600 # Declare the contents of the .PHONY variable as phony. We keep that 1601 # information in a variable so we can use it in if_changed and friends. 1602 .PHONY: $(PHONY) 1603