SWP_TYPE_BITS
BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
#define SWP_TYPE_MASK ((1UL << SWP_TYPE_BITS) - 1)
BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
& ((1UL << SWP_TYPE_BITS) - 1))
#define _SWP_TYPE_MASK ((1U << SWP_TYPE_BITS) - 1)
#define _SWP_TYPE_MASK ((1U << SWP_TYPE_BITS) - 1)
#define SWP_OFFSET_SHIFT (SWP_OFFSET_FIRST_BIT + SWP_TYPE_BITS)
#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
#define __swp_offset(x) ((x).val >> SWP_TYPE_BITS)
| (offset) << SWP_TYPE_BITS})
(~(pteval_t)(offset) << SWP_OFFSET_SHIFT >> SWP_TYPE_BITS) \
| ((pteval_t)(type) << (64 - SWP_TYPE_BITS)) })
#define __pteval_swp_type(x) ((unsigned long)((x).pte >> (64 - SWP_TYPE_BITS)))
#define __pteval_swp_offset(x) ((unsigned long)(~((x).pte) << SWP_TYPE_BITS >> SWP_OFFSET_SHIFT))
#define SWP_OFFSET_SHIFT (SWP_OFFSET_FIRST_BIT+SWP_TYPE_BITS)
#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
#define __swp_type(x) ((x).val >> (64 - SWP_TYPE_BITS))
#define __swp_offset(x) (~(x).val << SWP_TYPE_BITS >> SWP_OFFSET_SHIFT)
(~(unsigned long)(offset) << SWP_OFFSET_SHIFT >> SWP_TYPE_BITS) \
| ((unsigned long)(type) << (64-SWP_TYPE_BITS)) })