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