1VERSION = 2 2PATCHLEVEL = 6 3SUBLEVEL = 23 4EXTRAVERSION = 5NAME = Arr Matey! A Hairy Bilge Rat! 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# Do not: 14# o use make's built-in rules and variables 15# (this increases performance and avoid hard-to-debug behavour); 16# o print "Entering directory ..."; 17MAKEFLAGS += -rR --no-print-directory 18 19# We are using a recursive build, so we need to do a little thinking 20# to get the ordering right. 21# 22# Most importantly: sub-Makefiles should only ever modify files in 23# their own directory. If in some directory we have a dependency on 24# a file in another dir (which doesn't happen often, but it's often 25# unavoidable when linking the built-in.o targets which finally 26# turn into vmlinux), we will call a sub make in that other dir, and 27# after that we are sure that everything which is in that other dir 28# is now up to date. 29# 30# The only cases where we need to modify files which have global 31# effects are thus separated out and done before the recursive 32# descending is started. They are now explicitly listed as the 33# prepare rule. 34 35# To put more focus on warnings, be less verbose as default 36# Use 'make V=1' to see the full commands 37 38ifdef V 39 ifeq ("$(origin V)", "command line") 40 KBUILD_VERBOSE = $(V) 41 endif 42endif 43ifndef KBUILD_VERBOSE 44 KBUILD_VERBOSE = 0 45endif 46 47# Call a source code checker (by default, "sparse") as part of the 48# C compilation. 49# 50# Use 'make C=1' to enable checking of only re-compiled files. 51# Use 'make C=2' to enable checking of *all* source files, regardless 52# of whether they are re-compiled or not. 53# 54# See the file "Documentation/sparse.txt" for more details, including 55# where to get the "sparse" utility. 56 57ifdef C 58 ifeq ("$(origin C)", "command line") 59 KBUILD_CHECKSRC = $(C) 60 endif 61endif 62ifndef KBUILD_CHECKSRC 63 KBUILD_CHECKSRC = 0 64endif 65 66# Use make M=dir to specify directory of external module to build 67# Old syntax make ... SUBDIRS=$PWD is still supported 68# Setting the environment variable KBUILD_EXTMOD take precedence 69ifdef SUBDIRS 70 KBUILD_EXTMOD ?= $(SUBDIRS) 71endif 72ifdef M 73 ifeq ("$(origin M)", "command line") 74 KBUILD_EXTMOD := $(M) 75 endif 76endif 77 78 79# kbuild supports saving output files in a separate directory. 80# To locate output files in a separate directory two syntaxes are supported. 81# In both cases the working directory must be the root of the kernel src. 82# 1) O= 83# Use "make O=dir/to/store/output/files/" 84# 85# 2) Set KBUILD_OUTPUT 86# Set the environment variable KBUILD_OUTPUT to point to the directory 87# where the output files shall be placed. 88# export KBUILD_OUTPUT=dir/to/store/output/files/ 89# make 90# 91# The O= assignment takes precedence over the KBUILD_OUTPUT environment 92# variable. 93 94 95# KBUILD_SRC is set on invocation of make in OBJ directory 96# KBUILD_SRC is not intended to be used by the regular user (for now) 97ifeq ($(KBUILD_SRC),) 98 99# OK, Make called in directory where kernel src resides 100# Do we want to locate output files in a separate directory? 101ifdef O 102 ifeq ("$(origin O)", "command line") 103 KBUILD_OUTPUT := $(O) 104 endif 105endif 106 107# That's our default target when none is given on the command line 108PHONY := _all 109_all: 110 111ifneq ($(KBUILD_OUTPUT),) 112# Invoke a second make in the output directory, passing relevant variables 113# check that the output directory actually exists 114saved-output := $(KBUILD_OUTPUT) 115KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd) 116$(if $(KBUILD_OUTPUT),, \ 117 $(error output directory "$(saved-output)" does not exist)) 118 119PHONY += $(MAKECMDGOALS) 120 121$(filter-out _all,$(MAKECMDGOALS)) _all: 122 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ 123 KBUILD_SRC=$(CURDIR) \ 124 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@ 125 126# Leave processing to above invocation of make 127skip-makefile := 1 128endif # ifneq ($(KBUILD_OUTPUT),) 129endif # ifeq ($(KBUILD_SRC),) 130 131# We process the rest of the Makefile if this is the final invocation of make 132ifeq ($(skip-makefile),) 133 134# If building an external module we do not care about the all: rule 135# but instead _all depend on modules 136PHONY += all 137ifeq ($(KBUILD_EXTMOD),) 138_all: all 139else 140_all: modules 141endif 142 143srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR)) 144TOPDIR := $(srctree) 145# FIXME - TOPDIR is obsolete, use srctree/objtree 146objtree := $(CURDIR) 147src := $(srctree) 148obj := $(objtree) 149 150VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 151 152export srctree objtree VPATH TOPDIR 153 154 155# SUBARCH tells the usermode build what the underlying arch is. That is set 156# first, and if a usermode build is happening, the "ARCH=um" on the command 157# line overrides the setting of ARCH below. If a native build is happening, 158# then ARCH is assigned, getting whatever value it gets normally, and 159# SUBARCH is subsequently ignored. 160 161SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \ 162 -e s/arm.*/arm/ -e s/sa110/arm/ \ 163 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 164 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ ) 165 166# Cross compiling and selecting different set of gcc/bin-utils 167# --------------------------------------------------------------------------- 168# 169# When performing cross compilation for other architectures ARCH shall be set 170# to the target architecture. (See arch/* for the possibilities). 171# ARCH can be set during invocation of make: 172# make ARCH=ia64 173# Another way is to have ARCH set in the environment. 174# The default ARCH is the host where make is executed. 175 176# CROSS_COMPILE specify the prefix used for all executables used 177# during compilation. Only gcc and related bin-utils executables 178# are prefixed with $(CROSS_COMPILE). 179# CROSS_COMPILE can be set on the command line 180# make CROSS_COMPILE=ia64-linux- 181# Alternatively CROSS_COMPILE can be set in the environment. 182# Default value for CROSS_COMPILE is not to prefix executables 183# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 184 185ARCH ?= $(SUBARCH) 186CROSS_COMPILE ?= 187 188# Architecture as present in compile.h 189UTS_MACHINE := $(ARCH) 190SRCARCH := $(ARCH) 191 192KCONFIG_CONFIG ?= .config 193 194# SHELL used by kbuild 195CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 196 else if [ -x /bin/bash ]; then echo /bin/bash; \ 197 else echo sh; fi ; fi) 198 199HOSTCC = gcc 200HOSTCXX = g++ 201HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer 202HOSTCXXFLAGS = -O2 203 204# Decide whether to build built-in, modular, or both. 205# Normally, just do built-in. 206 207KBUILD_MODULES := 208KBUILD_BUILTIN := 1 209 210# If we have only "make modules", don't compile built-in objects. 211# When we're building modules with modversions, we need to consider 212# the built-in objects during the descend as well, in order to 213# make sure the checksums are up to date before we record them. 214 215ifeq ($(MAKECMDGOALS),modules) 216 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 217endif 218 219# If we have "make <whatever> modules", compile modules 220# in addition to whatever we do anyway. 221# Just "make" or "make all" shall build modules as well 222 223ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 224 KBUILD_MODULES := 1 225endif 226 227ifeq ($(MAKECMDGOALS),) 228 KBUILD_MODULES := 1 229endif 230 231export KBUILD_MODULES KBUILD_BUILTIN 232export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 233 234# Beautify output 235# --------------------------------------------------------------------------- 236# 237# Normally, we echo the whole command before executing it. By making 238# that echo $($(quiet)$(cmd)), we now have the possibility to set 239# $(quiet) to choose other forms of output instead, e.g. 240# 241# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 242# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 243# 244# If $(quiet) is empty, the whole command will be printed. 245# If it is set to "quiet_", only the short version will be printed. 246# If it is set to "silent_", nothing will be printed at all, since 247# the variable $(silent_cmd_cc_o_c) doesn't exist. 248# 249# A simple variant is to prefix commands with $(Q) - that's useful 250# for commands that shall be hidden in non-verbose mode. 251# 252# $(Q)ln $@ :< 253# 254# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 255# If KBUILD_VERBOSE equals 1 then the above command is displayed. 256 257ifeq ($(KBUILD_VERBOSE),1) 258 quiet = 259 Q = 260else 261 quiet=quiet_ 262 Q = @ 263endif 264 265# If the user is running make -s (silent mode), suppress echoing of 266# commands 267 268ifneq ($(findstring s,$(MAKEFLAGS)),) 269 quiet=silent_ 270endif 271 272export quiet Q KBUILD_VERBOSE 273 274 275# Look for make include files relative to root of kernel src 276MAKEFLAGS += --include-dir=$(srctree) 277 278# We need some generic definitions. 279include $(srctree)/scripts/Kbuild.include 280 281# Make variables (CC, etc...) 282 283AS = $(CROSS_COMPILE)as 284LD = $(CROSS_COMPILE)ld 285CC = $(CROSS_COMPILE)gcc 286CPP = $(CC) -E 287AR = $(CROSS_COMPILE)ar 288NM = $(CROSS_COMPILE)nm 289STRIP = $(CROSS_COMPILE)strip 290OBJCOPY = $(CROSS_COMPILE)objcopy 291OBJDUMP = $(CROSS_COMPILE)objdump 292AWK = awk 293GENKSYMS = scripts/genksyms/genksyms 294DEPMOD = /sbin/depmod 295KALLSYMS = scripts/kallsyms 296PERL = perl 297CHECK = sparse 298 299CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF) 300MODFLAGS = -DMODULE 301CFLAGS_MODULE = $(MODFLAGS) 302AFLAGS_MODULE = $(MODFLAGS) 303LDFLAGS_MODULE = 304CFLAGS_KERNEL = 305AFLAGS_KERNEL = 306 307 308# Use LINUXINCLUDE when you must reference the include/ directory. 309# Needed to be compatible with the O= option 310LINUXINCLUDE := -Iinclude \ 311 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \ 312 -include include/linux/autoconf.h 313 314CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE) 315 316CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 317 -fno-strict-aliasing -fno-common \ 318 -Werror-implicit-function-declaration 319AFLAGS := -D__ASSEMBLY__ 320 321# Read KERNELRELEASE from include/config/kernel.release (if it exists) 322KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 323KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION) 324 325export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 326export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 327export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE 328export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 329 330export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 331export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 332export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 333 334# When compiling out-of-tree modules, put MODVERDIR in the module 335# tree rather than in the kernel tree. The kernel tree might 336# even be read-only. 337export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 338 339# Files to ignore in find ... statements 340 341RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o 342export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git 343 344# =========================================================================== 345# Rules shared between *config targets and build targets 346 347# Basic helpers built in scripts/ 348PHONY += scripts_basic 349scripts_basic: 350 $(Q)$(MAKE) $(build)=scripts/basic 351 352# To avoid any implicit rule to kick in, define an empty command. 353scripts/basic/%: scripts_basic ; 354 355PHONY += outputmakefile 356# outputmakefile generates a Makefile in the output directory, if using a 357# separate output directory. This allows convenient use of make in the 358# output directory. 359outputmakefile: 360ifneq ($(KBUILD_SRC),) 361 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 362 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 363endif 364 365# To make sure we do not include .config for any of the *config targets 366# catch them early, and hand them over to scripts/kconfig/Makefile 367# It is allowed to specify more targets when calling make, including 368# mixing *config targets and build targets. 369# For example 'make oldconfig all'. 370# Detect when mixed targets is specified, and make a second invocation 371# of make so .config is not included in this case either (for *config). 372 373no-dot-config-targets := clean mrproper distclean \ 374 cscope TAGS tags help %docs check% \ 375 include/linux/version.h headers_% \ 376 kernelrelease kernelversion 377 378config-targets := 0 379mixed-targets := 0 380dot-config := 1 381 382ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 383 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 384 dot-config := 0 385 endif 386endif 387 388ifeq ($(KBUILD_EXTMOD),) 389 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 390 config-targets := 1 391 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 392 mixed-targets := 1 393 endif 394 endif 395endif 396 397ifeq ($(mixed-targets),1) 398# =========================================================================== 399# We're called with mixed targets (*config and build targets). 400# Handle them one by one. 401 402%:: FORCE 403 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ 404 405else 406ifeq ($(config-targets),1) 407# =========================================================================== 408# *config targets only - make sure prerequisites are updated, and descend 409# in scripts/kconfig to make the *config target 410 411# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 412# KBUILD_DEFCONFIG may point out an alternative default configuration 413# used for 'make defconfig' 414include $(srctree)/arch/$(ARCH)/Makefile 415export KBUILD_DEFCONFIG 416 417config %config: scripts_basic outputmakefile FORCE 418 $(Q)mkdir -p include/linux include/config 419 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 420 421else 422# =========================================================================== 423# Build targets only - this includes vmlinux, arch specific targets, clean 424# targets and others. In general all targets except *config targets. 425 426ifeq ($(KBUILD_EXTMOD),) 427# Additional helpers built in scripts/ 428# Carefully list dependencies so we do not try to build scripts twice 429# in parallel 430PHONY += scripts 431scripts: scripts_basic include/config/auto.conf 432 $(Q)$(MAKE) $(build)=$(@) 433 434# Objects we will link into vmlinux / subdirs we need to visit 435init-y := init/ 436drivers-y := drivers/ sound/ 437net-y := net/ 438libs-y := lib/ 439core-y := usr/ 440endif # KBUILD_EXTMOD 441 442ifeq ($(dot-config),1) 443# Read in config 444-include include/config/auto.conf 445 446ifeq ($(KBUILD_EXTMOD),) 447# Read in dependencies to all Kconfig* files, make sure to run 448# oldconfig if changes are detected. 449-include include/config/auto.conf.cmd 450 451# To avoid any implicit rule to kick in, define an empty command 452$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 453 454# If .config is newer than include/config/auto.conf, someone tinkered 455# with it and forgot to run make oldconfig. 456# if auto.conf.cmd is missing then we are probably in a cleaned tree so 457# we execute the config step to be sure to catch updated Kconfig files 458include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 459 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 460else 461# external modules needs include/linux/autoconf.h and include/config/auto.conf 462# but do not care if they are up-to-date. Use auto.conf to trigger the test 463PHONY += include/config/auto.conf 464 465include/config/auto.conf: 466 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \ 467 echo; \ 468 echo " ERROR: Kernel configuration is invalid."; \ 469 echo " include/linux/autoconf.h or $@ are missing."; \ 470 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 471 echo; \ 472 /bin/false) 473 474endif # KBUILD_EXTMOD 475 476else 477# Dummy target needed, because used as prerequisite 478include/config/auto.conf: ; 479endif # $(dot-config) 480 481# The all: target is the default when no target is given on the 482# command line. 483# This allow a user to issue only 'make' to build a kernel including modules 484# Defaults vmlinux but it is usually overridden in the arch makefile 485all: vmlinux 486 487ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 488CFLAGS += -Os 489else 490CFLAGS += -O2 491endif 492 493include $(srctree)/arch/$(ARCH)/Makefile 494 495ifdef CONFIG_FRAME_POINTER 496CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 497else 498CFLAGS += -fomit-frame-pointer 499endif 500 501ifdef CONFIG_DEBUG_INFO 502CFLAGS += -g 503endif 504 505# Force gcc to behave correct even for buggy distributions 506CFLAGS += $(call cc-option, -fno-stack-protector) 507 508# arch Makefile may override CC so keep this after arch Makefile is included 509NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 510CHECKFLAGS += $(NOSTDINC_FLAGS) 511 512# warn about C99 declaration after statement 513CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 514 515# disable pointer signed / unsigned warnings in gcc 4.0 516CFLAGS += $(call cc-option,-Wno-pointer-sign,) 517 518# Use --build-id when available. 519LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 520 $(call ld-option, -Wl$(comma)--build-id,)) 521LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 522LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 523 524# Default kernel image to build when no specific target is given. 525# KBUILD_IMAGE may be overruled on the command line or 526# set in the environment 527# Also any assignments in arch/$(ARCH)/Makefile take precedence over 528# this default value 529export KBUILD_IMAGE ?= vmlinux 530 531# 532# INSTALL_PATH specifies where to place the updated kernel and system map 533# images. Default is /boot, but you can set it to other values 534export INSTALL_PATH ?= /boot 535 536# 537# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 538# relocations required by build roots. This is not defined in the 539# makefile but the argument can be passed to make if needed. 540# 541 542MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 543export MODLIB 544 545# 546# INSTALL_MOD_STRIP, if defined, will cause modules to be 547# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 548# the default option --strip-debug will be used. Otherwise, 549# INSTALL_MOD_STRIP will used as the options to the strip command. 550 551ifdef INSTALL_MOD_STRIP 552ifeq ($(INSTALL_MOD_STRIP),1) 553mod_strip_cmd = $(STRIP) --strip-debug 554else 555mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 556endif # INSTALL_MOD_STRIP=1 557else 558mod_strip_cmd = true 559endif # INSTALL_MOD_STRIP 560export mod_strip_cmd 561 562 563ifeq ($(KBUILD_EXTMOD),) 564core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 565 566vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 567 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 568 $(net-y) $(net-m) $(libs-y) $(libs-m))) 569 570vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 571 $(init-n) $(init-) \ 572 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 573 $(net-n) $(net-) $(libs-n) $(libs-)))) 574 575init-y := $(patsubst %/, %/built-in.o, $(init-y)) 576core-y := $(patsubst %/, %/built-in.o, $(core-y)) 577drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 578net-y := $(patsubst %/, %/built-in.o, $(net-y)) 579libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 580libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 581libs-y := $(libs-y1) $(libs-y2) 582 583# Build vmlinux 584# --------------------------------------------------------------------------- 585# vmlinux is built from the objects selected by $(vmlinux-init) and 586# $(vmlinux-main). Most are built-in.o files from top-level directories 587# in the kernel tree, others are specified in arch/$(ARCH)/Makefile. 588# Ordering when linking is important, and $(vmlinux-init) must be first. 589# 590# vmlinux 591# ^ 592# | 593# +-< $(vmlinux-init) 594# | +--< init/version.o + more 595# | 596# +--< $(vmlinux-main) 597# | +--< driver/built-in.o mm/built-in.o + more 598# | 599# +-< kallsyms.o (see description in CONFIG_KALLSYMS section) 600# 601# vmlinux version (uname -v) cannot be updated during normal 602# descending-into-subdirs phase since we do not yet know if we need to 603# update vmlinux. 604# Therefore this step is delayed until just before final link of vmlinux - 605# except in the kallsyms case where it is done just before adding the 606# symbols to the kernel. 607# 608# System.map is generated to document addresses of all kernel symbols 609 610vmlinux-init := $(head-y) $(init-y) 611vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y) 612vmlinux-all := $(vmlinux-init) $(vmlinux-main) 613vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds 614export KBUILD_VMLINUX_OBJS := $(vmlinux-all) 615 616# Rule to link vmlinux - also used during CONFIG_KALLSYMS 617# May be overridden by arch/$(ARCH)/Makefile 618quiet_cmd_vmlinux__ ?= LD $@ 619 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \ 620 -T $(vmlinux-lds) $(vmlinux-init) \ 621 --start-group $(vmlinux-main) --end-group \ 622 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^) 623 624# Generate new vmlinux version 625quiet_cmd_vmlinux_version = GEN .version 626 cmd_vmlinux_version = set -e; \ 627 if [ ! -r .version ]; then \ 628 rm -f .version; \ 629 echo 1 >.version; \ 630 else \ 631 mv .version .old_version; \ 632 expr 0$$(cat .old_version) + 1 >.version; \ 633 fi; \ 634 $(MAKE) $(build)=init 635 636# Generate System.map 637quiet_cmd_sysmap = SYSMAP 638 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap 639 640# Link of vmlinux 641# If CONFIG_KALLSYMS is set .version is already updated 642# Generate System.map and verify that the content is consistent 643# Use + in front of the vmlinux_version rule to silent warning with make -j2 644# First command is ':' to allow us to use + in front of the rule 645define rule_vmlinux__ 646 : 647 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version)) 648 649 $(call cmd,vmlinux__) 650 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd 651 652 $(Q)$(if $($(quiet)cmd_sysmap), \ 653 echo ' $($(quiet)cmd_sysmap) System.map' &&) \ 654 $(cmd_sysmap) $@ System.map; \ 655 if [ $$? -ne 0 ]; then \ 656 rm -f $@; \ 657 /bin/false; \ 658 fi; 659 $(verify_kallsyms) 660endef 661 662 663ifdef CONFIG_KALLSYMS 664# Generate section listing all symbols and add it into vmlinux $(kallsyms.o) 665# It's a three stage process: 666# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is 667# empty 668# Running kallsyms on that gives us .tmp_kallsyms1.o with 669# the right size - vmlinux version (uname -v) is updated during this step 670# o .tmp_vmlinux2 now has a __kallsyms section of the right size, 671# but due to the added section, some addresses have shifted. 672# From here, we generate a correct .tmp_kallsyms2.o 673# o The correct .tmp_kallsyms2.o is linked into the final vmlinux. 674# o Verify that the System.map from vmlinux matches the map from 675# .tmp_vmlinux2, just in case we did not generate kallsyms correctly. 676# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using 677# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a 678# temporary bypass to allow the kernel to be built while the 679# maintainers work out what went wrong with kallsyms. 680 681ifdef CONFIG_KALLSYMS_EXTRA_PASS 682last_kallsyms := 3 683else 684last_kallsyms := 2 685endif 686 687kallsyms.o := .tmp_kallsyms$(last_kallsyms).o 688 689define verify_kallsyms 690 $(Q)$(if $($(quiet)cmd_sysmap), \ 691 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \ 692 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map 693 $(Q)cmp -s System.map .tmp_System.map || \ 694 (echo Inconsistent kallsyms data; \ 695 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \ 696 rm .tmp_kallsyms* ; /bin/false ) 697endef 698 699# Update vmlinux version before link 700# Use + in front of this rule to silent warning about make -j1 701# First command is ':' to allow us to use + in front of this rule 702cmd_ksym_ld = $(cmd_vmlinux__) 703define rule_ksym_ld 704 : 705 +$(call cmd,vmlinux_version) 706 $(call cmd,vmlinux__) 707 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd 708endef 709 710# Generate .S file with all kernel symbols 711quiet_cmd_kallsyms = KSYM $@ 712 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \ 713 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@ 714 715.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE 716 $(call if_changed_dep,as_o_S) 717 718.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS) 719 $(call cmd,kallsyms) 720 721# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version 722.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE 723 $(call if_changed_rule,ksym_ld) 724 725.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE 726 $(call if_changed,vmlinux__) 727 728.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE 729 $(call if_changed,vmlinux__) 730 731# Needs to visit scripts/ before $(KALLSYMS) can be used. 732$(KALLSYMS): scripts ; 733 734# Generate some data for debugging strange kallsyms problems 735debug_kallsyms: .tmp_map$(last_kallsyms) 736 737.tmp_map%: .tmp_vmlinux% FORCE 738 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@ 739 740.tmp_map3: .tmp_map2 741 742.tmp_map2: .tmp_map1 743 744endif # ifdef CONFIG_KALLSYMS 745 746# Do modpost on a prelinked vmlinux. The finally linked vmlinux has 747# relevant sections renamed as per the linker script. 748quiet_cmd_vmlinux-modpost = LD $@ 749 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \ 750 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \ 751 $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^) 752define rule_vmlinux-modpost 753 : 754 +$(call cmd,vmlinux-modpost) 755 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@ 756 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd 757endef 758 759# vmlinux image - including updated kernel symbols 760vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE 761ifdef CONFIG_HEADERS_CHECK 762 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 763endif 764 $(call vmlinux-modpost) 765 $(call if_changed_rule,vmlinux__) 766 $(Q)rm -f .old_version 767 768vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE 769 $(call if_changed_rule,vmlinux-modpost) 770 771# The actual objects are generated when descending, 772# make sure no implicit rule kicks in 773$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ; 774 775# Handle descending into subdirectories listed in $(vmlinux-dirs) 776# Preset locale variables to speed up the build process. Limit locale 777# tweaks to this spot to avoid wrong language settings when running 778# make menuconfig etc. 779# Error messages still appears in the original language 780 781PHONY += $(vmlinux-dirs) 782$(vmlinux-dirs): prepare scripts 783 $(Q)$(MAKE) $(build)=$@ 784 785# Build the kernel release string 786# 787# The KERNELRELEASE value built here is stored in the file 788# include/config/kernel.release, and is used when executing several 789# make targets, such as "make install" or "make modules_install." 790# 791# The eventual kernel release string consists of the following fields, 792# shown in a hierarchical format to show how smaller parts are concatenated 793# to form the larger and final value, with values coming from places like 794# the Makefile, kernel config options, make command line options and/or 795# SCM tag information. 796# 797# $(KERNELVERSION) 798# $(VERSION) eg, 2 799# $(PATCHLEVEL) eg, 6 800# $(SUBLEVEL) eg, 18 801# $(EXTRAVERSION) eg, -rc6 802# $(localver-full) 803# $(localver) 804# localversion* (files without backups, containing '~') 805# $(CONFIG_LOCALVERSION) (from kernel config setting) 806# $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set) 807# ./scripts/setlocalversion (SCM tag, if one exists) 808# $(LOCALVERSION) (from make command line if provided) 809# 810# Note how the final $(localver-auto) string is included *only* if the 811# kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the 812# moment, only git is supported but other SCMs can edit the script 813# scripts/setlocalversion and add the appropriate checks as needed. 814 815pattern = ".*/localversion[^~]*" 816string = $(shell cat /dev/null \ 817 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`) 818 819localver = $(subst $(space),, $(string) \ 820 $(patsubst "%",%,$(CONFIG_LOCALVERSION))) 821 822# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called 823# and if the SCM is know a tag from the SCM is appended. 824# The appended tag is determined by the SCM used. 825# 826# Currently, only git is supported. 827# Other SCMs can edit scripts/setlocalversion and add the appropriate 828# checks as needed. 829ifdef CONFIG_LOCALVERSION_AUTO 830 _localver-auto = $(shell $(CONFIG_SHELL) \ 831 $(srctree)/scripts/setlocalversion $(srctree)) 832 localver-auto = $(LOCALVERSION)$(_localver-auto) 833endif 834 835localver-full = $(localver)$(localver-auto) 836 837# Store (new) KERNELRELASE string in include/config/kernel.release 838kernelrelease = $(KERNELVERSION)$(localver-full) 839include/config/kernel.release: include/config/auto.conf FORCE 840 $(Q)rm -f $@ 841 $(Q)echo $(kernelrelease) > $@ 842 843 844# Things we need to do before we recursively start building the kernel 845# or the modules are listed in "prepare". 846# A multi level approach is used. prepareN is processed before prepareN-1. 847# archprepare is used in arch Makefiles and when processed asm symlink, 848# version.h and scripts_basic is processed / created. 849 850# Listed in dependency order 851PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 852 853# prepare3 is used to check if we are building in a separate output directory, 854# and if so do: 855# 1) Check that make has not been executed in the kernel src $(srctree) 856# 2) Create the include2 directory, used for the second asm symlink 857prepare3: include/config/kernel.release 858ifneq ($(KBUILD_SRC),) 859 @echo ' Using $(srctree) as source for kernel' 860 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 861 echo " $(srctree) is not clean, please run 'make mrproper'";\ 862 echo " in the '$(srctree)' directory.";\ 863 /bin/false; \ 864 fi; 865 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi; 866 $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm 867endif 868 869# prepare2 creates a makefile if using a separate output directory 870prepare2: prepare3 outputmakefile 871 872prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \ 873 include/asm include/config/auto.conf 874ifneq ($(KBUILD_MODULES),) 875 $(Q)mkdir -p $(MODVERDIR) 876 $(Q)rm -f $(MODVERDIR)/* 877endif 878 879archprepare: prepare1 scripts_basic 880 881prepare0: archprepare FORCE 882 $(Q)$(MAKE) $(build)=. 883 $(Q)$(MAKE) $(build)=. missing-syscalls 884 885# All the preparing.. 886prepare: prepare0 887 888# Leave this as default for preprocessing vmlinux.lds.S, which is now 889# done in arch/$(ARCH)/kernel/Makefile 890 891export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH) 892 893# FIXME: The asm symlink changes when $(ARCH) changes. That's 894# hard to detect, but I suppose "make mrproper" is a good idea 895# before switching between archs anyway. 896 897include/asm: 898 @echo ' SYMLINK $@ -> include/asm-$(SRCARCH)' 899 $(Q)if [ ! -d include ]; then mkdir -p include; fi; 900 @ln -fsn asm-$(SRCARCH) $@ 901 902# Generate some files 903# --------------------------------------------------------------------------- 904 905# KERNELRELEASE can change from a few different places, meaning version.h 906# needs to be updated, so this check is forced on all builds 907 908uts_len := 64 909define filechk_utsrelease.h 910 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 911 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 912 exit 1; \ 913 fi; \ 914 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 915endef 916 917define filechk_version.h 918 (echo \#define LINUX_VERSION_CODE $(shell \ 919 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 920 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 921endef 922 923include/linux/version.h: $(srctree)/Makefile FORCE 924 $(call filechk,version.h) 925 926include/linux/utsrelease.h: include/config/kernel.release FORCE 927 $(call filechk,utsrelease.h) 928 929# --------------------------------------------------------------------------- 930 931PHONY += depend dep 932depend dep: 933 @echo '*** Warning: make $@ is unnecessary now.' 934 935# --------------------------------------------------------------------------- 936# Kernel headers 937INSTALL_HDR_PATH=$(objtree)/usr 938export INSTALL_HDR_PATH 939 940HDRFILTER=generic i386 x86_64 941HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild))) 942 943PHONY += headers_install_all 944headers_install_all: include/linux/version.h scripts_basic FORCE 945 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 946 $(Q)for arch in $(HDRARCHES); do \ 947 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\ 948 done 949 950PHONY += headers_install 951headers_install: include/linux/version.h scripts_basic FORCE 952 @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \ 953 echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \ 954 exit 1 ; fi 955 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 956 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include 957 958PHONY += headers_check_all 959headers_check_all: headers_install_all 960 $(Q)for arch in $(HDRARCHES); do \ 961 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\ 962 done 963 964PHONY += headers_check 965headers_check: headers_install 966 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1 967 968# --------------------------------------------------------------------------- 969# Modules 970 971ifdef CONFIG_MODULES 972 973# By default, build modules as well 974 975all: modules 976 977# Build modules 978 979PHONY += modules 980modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) 981 @echo ' Building modules, stage 2.'; 982 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 983 984 985# Target to prepare building external modules 986PHONY += modules_prepare 987modules_prepare: prepare scripts 988 989# Target to install modules 990PHONY += modules_install 991modules_install: _modinst_ _modinst_post 992 993PHONY += _modinst_ 994_modinst_: 995 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \ 996 echo "Warning: you may need to install module-init-tools"; \ 997 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\ 998 sleep 1; \ 999 fi 1000 @rm -rf $(MODLIB)/kernel 1001 @rm -f $(MODLIB)/source 1002 @mkdir -p $(MODLIB)/kernel 1003 @ln -s $(srctree) $(MODLIB)/source 1004 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1005 rm -f $(MODLIB)/build ; \ 1006 ln -s $(objtree) $(MODLIB)/build ; \ 1007 fi 1008 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1009 1010# If System.map exists, run depmod. This deliberately does not have a 1011# dependency on System.map since that would run the dependency tree on 1012# vmlinux. This depmod is only for convenience to give the initial 1013# boot a modules.dep even before / is mounted read-write. However the 1014# boot script depmod is the master version. 1015ifeq "$(strip $(INSTALL_MOD_PATH))" "" 1016depmod_opts := 1017else 1018depmod_opts := -b $(INSTALL_MOD_PATH) -r 1019endif 1020PHONY += _modinst_post 1021_modinst_post: _modinst_ 1022 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi 1023 1024else # CONFIG_MODULES 1025 1026# Modules not configured 1027# --------------------------------------------------------------------------- 1028 1029modules modules_install: FORCE 1030 @echo 1031 @echo "The present kernel configuration has modules disabled." 1032 @echo "Type 'make config' and enable loadable module support." 1033 @echo "Then build a kernel with module support enabled." 1034 @echo 1035 @exit 1 1036 1037endif # CONFIG_MODULES 1038 1039### 1040# Cleaning is done on three levels. 1041# make clean Delete most generated files 1042# Leave enough to build external modules 1043# make mrproper Delete the current configuration, and all generated files 1044# make distclean Remove editor backup files, patch leftover files and the like 1045 1046# Directories & files removed with 'make clean' 1047CLEAN_DIRS += $(MODVERDIR) 1048CLEAN_FILES += vmlinux System.map \ 1049 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map 1050 1051# Directories & files removed with 'make mrproper' 1052MRPROPER_DIRS += include/config include2 usr/include 1053MRPROPER_FILES += .config .config.old include/asm .version .old_version \ 1054 include/linux/autoconf.h include/linux/version.h \ 1055 include/linux/utsrelease.h \ 1056 Module.symvers tags TAGS cscope* 1057 1058# clean - Delete most, but leave enough to build external modules 1059# 1060clean: rm-dirs := $(CLEAN_DIRS) 1061clean: rm-files := $(CLEAN_FILES) 1062clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs)) 1063 1064PHONY += $(clean-dirs) clean archclean 1065$(clean-dirs): 1066 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1067 1068clean: archclean $(clean-dirs) 1069 $(call cmd,rmdirs) 1070 $(call cmd,rmfiles) 1071 @find . $(RCS_FIND_IGNORE) \ 1072 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1073 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1074 -o -name '*.symtypes' \) \ 1075 -type f -print | xargs rm -f 1076 1077# mrproper - Delete all generated files, including .config 1078# 1079mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1080mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1081mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1082 1083PHONY += $(mrproper-dirs) mrproper archmrproper 1084$(mrproper-dirs): 1085 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1086 1087mrproper: clean archmrproper $(mrproper-dirs) 1088 $(call cmd,rmdirs) 1089 $(call cmd,rmfiles) 1090 1091# distclean 1092# 1093PHONY += distclean 1094 1095distclean: mrproper 1096 @find $(srctree) $(RCS_FIND_IGNORE) \ 1097 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1098 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1099 -o -name '.*.rej' -o -size 0 \ 1100 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ 1101 -type f -print | xargs rm -f 1102 1103 1104# Packaging of the kernel to various formats 1105# --------------------------------------------------------------------------- 1106# rpm target kept for backward compatibility 1107package-dir := $(srctree)/scripts/package 1108 1109%pkg: include/config/kernel.release FORCE 1110 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1111rpm: include/config/kernel.release FORCE 1112 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1113 1114 1115# Brief documentation of the typical targets used 1116# --------------------------------------------------------------------------- 1117 1118boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig) 1119boards := $(notdir $(boards)) 1120 1121help: 1122 @echo 'Cleaning targets:' 1123 @echo ' clean - Remove most generated files but keep the config and' 1124 @echo ' enough build support to build external modules' 1125 @echo ' mrproper - Remove all generated files + config + various backup files' 1126 @echo ' distclean - mrproper + remove editor backup and patch files' 1127 @echo '' 1128 @echo 'Configuration targets:' 1129 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1130 @echo '' 1131 @echo 'Other generic targets:' 1132 @echo ' all - Build all targets marked with [*]' 1133 @echo '* vmlinux - Build the bare kernel' 1134 @echo '* modules - Build all modules' 1135 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1136 @echo ' dir/ - Build all files in dir and below' 1137 @echo ' dir/file.[ois] - Build specified target only' 1138 @echo ' dir/file.ko - Build module including final link' 1139 @echo ' rpm - Build a kernel as an RPM package' 1140 @echo ' tags/TAGS - Generate tags file for editors' 1141 @echo ' cscope - Generate cscope index' 1142 @echo ' kernelrelease - Output the release version string' 1143 @echo ' kernelversion - Output the version stored in Makefile' 1144 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \ 1145 echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1146 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1147 fi 1148 @echo '' 1149 @echo 'Static analysers' 1150 @echo ' checkstack - Generate a list of stack hogs' 1151 @echo ' namespacecheck - Name space analysis on compiled kernel' 1152 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \ 1153 echo ' headers_check - Sanity check on exported headers'; \ 1154 fi 1155 @echo '' 1156 @echo 'Kernel packaging:' 1157 @$(MAKE) $(build)=$(package-dir) help 1158 @echo '' 1159 @echo 'Documentation targets:' 1160 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1161 @echo '' 1162 @echo 'Architecture specific targets ($(ARCH)):' 1163 @$(if $(archhelp),$(archhelp),\ 1164 echo ' No architecture specific help defined for $(ARCH)') 1165 @echo '' 1166 @$(if $(boards), \ 1167 $(foreach b, $(boards), \ 1168 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1169 echo '') 1170 1171 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1172 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1173 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1174 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1175 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1176 @echo '' 1177 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1178 @echo 'For further info see the ./README file' 1179 1180 1181# Documentation targets 1182# --------------------------------------------------------------------------- 1183%docs: scripts_basic FORCE 1184 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1185 1186else # KBUILD_EXTMOD 1187 1188### 1189# External module support. 1190# When building external modules the kernel used as basis is considered 1191# read-only, and no consistency checks are made and the make 1192# system is not used on the basis kernel. If updates are required 1193# in the basis kernel ordinary make commands (without M=...) must 1194# be used. 1195# 1196# The following are the only valid targets when building external 1197# modules. 1198# make M=dir clean Delete all automatically generated files 1199# make M=dir modules Make all modules in specified dir 1200# make M=dir Same as 'make M=dir modules' 1201# make M=dir modules_install 1202# Install the modules built in the module directory 1203# Assumes install directory is already created 1204 1205# We are always building modules 1206KBUILD_MODULES := 1 1207PHONY += crmodverdir 1208crmodverdir: 1209 $(Q)mkdir -p $(MODVERDIR) 1210 $(Q)rm -f $(MODVERDIR)/* 1211 1212PHONY += $(objtree)/Module.symvers 1213$(objtree)/Module.symvers: 1214 @test -e $(objtree)/Module.symvers || ( \ 1215 echo; \ 1216 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1217 echo " is missing; modules will have no dependencies and modversions."; \ 1218 echo ) 1219 1220module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1221PHONY += $(module-dirs) modules 1222$(module-dirs): crmodverdir $(objtree)/Module.symvers 1223 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1224 1225modules: $(module-dirs) 1226 @echo ' Building modules, stage 2.'; 1227 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1228 1229PHONY += modules_install 1230modules_install: _emodinst_ _emodinst_post 1231 1232install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1233PHONY += _emodinst_ 1234_emodinst_: 1235 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1236 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1237 1238# Run depmod only is we have System.map and depmod is executable 1239quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1240 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \ 1241 $(DEPMOD) -ae -F System.map \ 1242 $(if $(strip $(INSTALL_MOD_PATH)), \ 1243 -b $(INSTALL_MOD_PATH) -r) \ 1244 $(KERNELRELEASE); \ 1245 fi 1246 1247PHONY += _emodinst_post 1248_emodinst_post: _emodinst_ 1249 $(call cmd,depmod) 1250 1251clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1252 1253PHONY += $(clean-dirs) clean 1254$(clean-dirs): 1255 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1256 1257clean: rm-dirs := $(MODVERDIR) 1258clean: $(clean-dirs) 1259 $(call cmd,rmdirs) 1260 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \ 1261 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1262 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \ 1263 -type f -print | xargs rm -f 1264 1265help: 1266 @echo ' Building external modules.' 1267 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1268 @echo '' 1269 @echo ' modules - default target, build the module(s)' 1270 @echo ' modules_install - install the module' 1271 @echo ' clean - remove generated files in module directory only' 1272 @echo '' 1273 1274# Dummies... 1275PHONY += prepare scripts 1276prepare: ; 1277scripts: ; 1278endif # KBUILD_EXTMOD 1279 1280# Generate tags for editors 1281# --------------------------------------------------------------------------- 1282 1283#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set 1284#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file. 1285#Adding $(srctree) adds about 20M on i386 to the size of the output file! 1286 1287ifeq ($(src),$(obj)) 1288__srctree = 1289else 1290__srctree = $(srctree)/ 1291endif 1292 1293ifeq ($(ALLSOURCE_ARCHS),) 1294ifeq ($(ARCH),um) 1295ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH) 1296else 1297ALLINCLUDE_ARCHS := $(SRCARCH) 1298endif 1299else 1300#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour. 1301ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS) 1302endif 1303 1304# Take care of arch/x86 1305ifeq ($(ARCH), $(SRCARCH)) 1306ALLSOURCE_ARCHS := $(ARCH) 1307else 1308ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH) 1309endif 1310 1311define find-sources 1312 ( for ARCH in $(ALLSOURCE_ARCHS) ; do \ 1313 find $(__srctree)arch/$${SRCARCH} $(RCS_FIND_IGNORE) \ 1314 -name $1 -print; \ 1315 done ; \ 1316 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \ 1317 -name $1 -print; \ 1318 find $(__srctree)include $(RCS_FIND_IGNORE) \ 1319 \( -name config -o -name 'asm-*' \) -prune \ 1320 -o -name $1 -print; \ 1321 for ARCH in $(ALLINCLUDE_ARCHS) ; do \ 1322 find $(__srctree)include/asm-$${SRCARCH} $(RCS_FIND_IGNORE) \ 1323 -name $1 -print; \ 1324 done ; \ 1325 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \ 1326 -name $1 -print; \ 1327 find $(__srctree) $(RCS_FIND_IGNORE) \ 1328 \( -name include -o -name arch \) -prune -o \ 1329 -name $1 -print; \ 1330 ) 1331endef 1332 1333define all-sources 1334 $(call find-sources,'*.[chS]') 1335endef 1336define all-kconfigs 1337 $(call find-sources,'Kconfig*') 1338endef 1339define all-defconfigs 1340 $(call find-sources,'defconfig') 1341endef 1342 1343define xtags 1344 if $1 --version 2>&1 | grep -iq exuberant; then \ 1345 $(all-sources) | xargs $1 -a \ 1346 -I __initdata,__exitdata,__acquires,__releases \ 1347 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \ 1348 --extra=+f --c-kinds=+px \ 1349 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \ 1350 $(all-kconfigs) | xargs $1 -a \ 1351 --langdef=kconfig \ 1352 --language-force=kconfig \ 1353 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \ 1354 $(all-defconfigs) | xargs -r $1 -a \ 1355 --langdef=dotconfig \ 1356 --language-force=dotconfig \ 1357 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \ 1358 elif $1 --version 2>&1 | grep -iq emacs; then \ 1359 $(all-sources) | xargs $1 -a; \ 1360 $(all-kconfigs) | xargs $1 -a \ 1361 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \ 1362 $(all-defconfigs) | xargs -r $1 -a \ 1363 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \ 1364 else \ 1365 $(all-sources) | xargs $1 -a; \ 1366 fi 1367endef 1368 1369quiet_cmd_cscope-file = FILELST cscope.files 1370 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files 1371 1372quiet_cmd_cscope = MAKE cscope.out 1373 cmd_cscope = cscope -b 1374 1375cscope: FORCE 1376 $(call cmd,cscope-file) 1377 $(call cmd,cscope) 1378 1379quiet_cmd_TAGS = MAKE $@ 1380define cmd_TAGS 1381 rm -f $@; \ 1382 $(call xtags,etags) 1383endef 1384 1385TAGS: FORCE 1386 $(call cmd,TAGS) 1387 1388quiet_cmd_tags = MAKE $@ 1389define cmd_tags 1390 rm -f $@; \ 1391 $(call xtags,ctags) 1392endef 1393 1394tags: FORCE 1395 $(call cmd,tags) 1396 1397 1398# Scripts to check various things for consistency 1399# --------------------------------------------------------------------------- 1400 1401includecheck: 1402 find * $(RCS_FIND_IGNORE) \ 1403 -name '*.[hcS]' -type f -print | sort \ 1404 | xargs $(PERL) -w scripts/checkincludes.pl 1405 1406versioncheck: 1407 find * $(RCS_FIND_IGNORE) \ 1408 -name '*.[hcS]' -type f -print | sort \ 1409 | xargs $(PERL) -w scripts/checkversion.pl 1410 1411namespacecheck: 1412 $(PERL) $(srctree)/scripts/namespace.pl 1413 1414endif #ifeq ($(config-targets),1) 1415endif #ifeq ($(mixed-targets),1) 1416 1417PHONY += checkstack kernelrelease kernelversion 1418 1419# UML needs a little special treatment here. It wants to use the host 1420# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1421# else wants $(ARCH), including people doing cross-builds, which means 1422# that $(SUBARCH) doesn't work here. 1423ifeq ($(ARCH), um) 1424CHECKSTACK_ARCH := $(SUBARCH) 1425else 1426CHECKSTACK_ARCH := $(ARCH) 1427endif 1428checkstack: 1429 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1430 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1431 1432kernelrelease: 1433 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \ 1434 $(error kernelrelease not valid - run 'make prepare' to update it)) 1435kernelversion: 1436 @echo $(KERNELVERSION) 1437 1438# Single targets 1439# --------------------------------------------------------------------------- 1440# Single targets are compatible with: 1441# - build whith mixed source and output 1442# - build with separate output dir 'make O=...' 1443# - external modules 1444# 1445# target-dir => where to store outputfile 1446# build-dir => directory in kernel source tree to use 1447 1448ifeq ($(KBUILD_EXTMOD),) 1449 build-dir = $(patsubst %/,%,$(dir $@)) 1450 target-dir = $(dir $@) 1451else 1452 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1453 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1454 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1455endif 1456 1457%.s: %.c prepare scripts FORCE 1458 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1459%.i: %.c prepare scripts FORCE 1460 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1461%.o: %.c prepare scripts FORCE 1462 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1463%.lst: %.c prepare scripts FORCE 1464 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1465%.s: %.S prepare scripts FORCE 1466 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1467%.o: %.S prepare scripts FORCE 1468 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1469%.symtypes: %.c prepare scripts FORCE 1470 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1471 1472# Modules 1473/ %/: prepare scripts FORCE 1474 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1475 $(build)=$(build-dir) 1476%.ko: prepare scripts FORCE 1477 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1478 $(build)=$(build-dir) $(@:.ko=.o) 1479 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1480 1481# FIXME Should go into a make.lib or something 1482# =========================================================================== 1483 1484quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1485 cmd_rmdirs = rm -rf $(rm-dirs) 1486 1487quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1488 cmd_rmfiles = rm -f $(rm-files) 1489 1490 1491a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \ 1492 $(NOSTDINC_FLAGS) $(CPPFLAGS) \ 1493 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o) 1494 1495quiet_cmd_as_o_S = AS $@ 1496cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 1497 1498# read all saved command lines 1499 1500targets := $(wildcard $(sort $(targets))) 1501cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1502 1503ifneq ($(cmd_files),) 1504 $(cmd_files): ; # Do not try to update included dependency files 1505 include $(cmd_files) 1506endif 1507 1508# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1509# Usage: 1510# $(Q)$(MAKE) $(clean)=dir 1511clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1512 1513endif # skip-makefile 1514 1515PHONY += FORCE 1516FORCE: 1517 1518# Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes. 1519Makefile: ; 1520 1521# Declare the contents of the .PHONY variable as phony. We keep that 1522# information in a variable se we can use it in if_changed and friends. 1523.PHONY: $(PHONY) 1524