SWP_TYPE_SHIFT     13 include/linux/swapops.h #define SWP_OFFSET_MASK(e)	((1UL << SWP_TYPE_SHIFT(e)) - 1)
SWP_TYPE_SHIFT     22 include/linux/swapops.h 	ret.val = (type << SWP_TYPE_SHIFT(ret)) |
SWP_TYPE_SHIFT     33 include/linux/swapops.h 	return (entry.val >> SWP_TYPE_SHIFT(entry));