__RD32             31 include/xen/interface/io/ring.h 	(__RD32(((_sz) - offsetof(struct _s##_sring, ring)) /	\
__RD32             38 include/xen/interface/io/ring.h 	(__RD32(((_sz) - (long)&(_s)->ring + (long)(_s)) / sizeof((_s)->ring[0])))