CHROMIUM: add boot-to-device mapper support.

init/Makefile

 #
 # Makefile for the linux kernel.
 #
 
 obj-y                          := main.o version.o mounts.o
 ifneq ($(CONFIG_BLK_DEV_INITRD),y)
 obj-y                          += noinitramfs.o
 else
 obj-$(CONFIG_BLK_DEV_INITRD)   += initramfs.o
 endif
 obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o
 
 mounts-y                        := do_mounts.o
 mounts-$(CONFIG_BLK_DEV_RAM)    += do_mounts_rd.o
 mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o
 mounts-$(CONFIG_BLK_DEV_MD)     += do_mounts_md.o
+mounts-$(CONFIG_BLK_DEV_DM)     += do_mounts_dm.o
 
 # files to be removed upon make clean
 clean-files := ../include/linux/compile.h
 
 # dependencies on generated files need to be listed explicitly
 
 $(obj)/version.o: include/linux/compile.h
 
 # compile.h changes depending on hostname, generation number, etc,
 # so we regenerate it always.
 # mkcompile_h will make sure to only update the
 # actual file if its content has changed.
 
        chk_compile.h = :
  quiet_chk_compile.h = echo '  CHK     $@'
 silent_chk_compile.h = :
 include/linux/compile.h: FORCE
         @$($(quiet)chk_compile.h)
         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
         "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CC) $(KBUILD_CFLAGS)"