rpcrdma_sendctx_next
for (i = rpcrdma_sendctx_next(buf, buf->rb_sc_tail);
i != rpcrdma_sendctx_next(buf, buf->rb_sc_head);
i = rpcrdma_sendctx_next(buf, i)) {
static unsigned long rpcrdma_sendctx_next(struct rpcrdma_buffer *buf,
next_head = rpcrdma_sendctx_next(buf, buf->rb_sc_head);
next_head = rpcrdma_sendctx_next(buf, buf->rb_sc_head);
next_tail = rpcrdma_sendctx_next(buf, next_tail);