CB_NULL           434 fs/nfs/callback.c 		if (rqstp->rq_proc != CB_NULL)
CB_NULL          1053 fs/nfs/callback_xdr.c 	[CB_NULL] = {
CB_NULL           779 fs/nfsd/nfs4callback.c 	PROC(CB_NULL,	NULL,		cb_null,	cb_null),