SWP_TYPE_SHIFT 24 include/linux/swapops.h #define SWP_OFFSET_MASK ((1UL << SWP_TYPE_SHIFT) - 1) SWP_TYPE_SHIFT 33 include/linux/swapops.h ret.val = (type << SWP_TYPE_SHIFT) | (offset & SWP_OFFSET_MASK); SWP_TYPE_SHIFT 43 include/linux/swapops.h return (entry.val >> SWP_TYPE_SHIFT);