Revert "B"

This reverts commit d58507d97f09048c015e3a35ad8d089b9219fd09.

	modified:   fs/ext2/balloc.c
	modified:   fs/ext2/xattr.c
	modified:   fs/ext4/mballoc.c
	modified:   lib/Kconfig
	modified:   lib/crc32defs.h
IO Boost
	modified:   mm/page-writeback.c