PV_LOCKPTR
#define PV_WR_LOCK(pa) rw_wlock(PV_LOCKPTR(pa))
#define PV_RD_LOCK(pa) rw_rlock(PV_LOCKPTR(pa))
#define PV_UNLOCK(pa) rw_unlock(PV_LOCKPTR(pa))
#define PV_LOCKASSERT(pa) rw_assert(PV_LOCKPTR(pa), RA_LOCKED)
#define PV_LOCK_RD_ASSERT(pa) rw_assert(PV_LOCKPTR(pa), RA_RLOCKED)
#define PV_LOCK_WR_ASSERT(pa) rw_assert(PV_LOCKPTR(pa), RA_WLOCKED)
rw_assert(PV_LOCKPTR(VM_PAGE_TO_PHYS(m)), RA_LOCKED);