SWAP_FLAG_PRIO_MASK   30 include/linux/swap.h #define SWAP_FLAGS_VALID	(SWAP_FLAG_PRIO_MASK | SWAP_FLAG_PREFER | \
SWAP_FLAG_PRIO_MASK 3294 mm/swapfile.c  		  (swap_flags & SWAP_FLAG_PRIO_MASK) >> SWAP_FLAG_PRIO_SHIFT;