__XFS_IPINNED_BIT
wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IPINNED_BIT);
DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IPINNED_BIT);
#define XFS_IPINNED (1 << __XFS_IPINNED_BIT)
wake_up_bit(&ip->i_flags, __XFS_IPINNED_BIT);