uvmpd_trylockowner
struct krwlock *uvmpd_trylockowner(struct vm_page *);
lock = uvmpd_trylockowner(pg);
lock = uvmpd_trylockowner(p);
lock = uvmpd_trylockowner(pg);
lock = uvmpd_trylockowner(pg);
lock = uvmpd_trylockowner(pg);