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