FYI, the attached .config fails with the build errors below. Kernel is 
latest 2.6.23-git. Found via make randconfig.

	Ingo

In file included from drivers/mtd/chips/cfi_cmdset_0002.c:40:
include/linux/mtd/cfi.h: In function 'cfi_build_cmd':
include/linux/mtd/cfi.h:293: error: implicit declaration of function 'cfi_interleave'
In file included from drivers/mtd/chips/jedec_probe.c:25:
include/linux/mtd/cfi.h: In function 'cfi_build_cmd':
include/linux/mtd/cfi.h:293: error: implicit declaration of function 'cfi_interleave'
In file included from drivers/mtd/chips/cfi_util.c:28:
include/linux/mtd/cfi.h: In function 'cfi_build_cmd':
include/linux/mtd/cfi.h:293: error: implicit declaration of function 'cfi_interleave'
In file included from drivers/mtd/chips/cfi_probe.c:20:
include/linux/mtd/cfi.h: In function 'cfi_build_cmd':
include/linux/mtd/cfi.h:293: error: implicit declaration of function 'cfi_interleave'
In file included from drivers/mtd/chips/cfi_cmdset_0001.c:41:
include/linux/mtd/cfi.h: In function 'cfi_build_cmd':
include/linux/mtd/cfi.h:293: error: implicit declaration of function 'cfi_interleave'
In file included from drivers/mtd/chips/gen_probe.c:14:
include/linux/mtd/cfi.h: In function 'cfi_build_cmd':
include/linux/mtd/cfi.h:293: error: implicit declaration of function 'cfi_interleave'
In file included from drivers/mtd/maps/esb2rom.c:22:
include/linux/mtd/cfi.h: In function 'cfi_build_cmd':
include/linux/mtd/cfi.h:293: error: implicit declaration of function 'cfi_interleave'
In file included from drivers/mtd/maps/scb2_flash.c:56:
include/linux/mtd/cfi.h: In function 'cfi_build_cmd':
include/linux/mtd/cfi.h:293: error: implicit declaration of function 'cfi_interleave'
In file included from drivers/mtd/maps/amd76xrom.c:17:
include/linux/mtd/cfi.h: In function 'cfi_build_cmd':
include/linux/mtd/cfi.h:293: error: implicit declaration of function 'cfi_interleave'
drivers/mtd/ubi/scan.c: In function 'ubi_scan':
4.83user 1.89system 0:07.88elapsed 85%CPU (0avgtext+0avgdata 0maxresident)k