> +/* subbuf_start callback wrapper */
> +static int cb_subbuf_start(struct rchan_buf *buf, void *subbuf,
> + void *prev_subbuf, size_t prev_padding)
I don't think the comment adds any information over just looking at the
function and the two callers. I'd also name it relay_subbuf_start
instead of the cb_ prefix not used anywhere else in the file.
> {
> + if (buf->chan->cb->subbuf_start)
> + return buf->chan->cb->subbuf_start(buf, subbuf,
> + prev_subbuf, prev_padding);
> +
> if (relay_buf_full(buf))
> return 0;
This could also be simplified a bit more to:
if (!buf->chan->cb->subbuf_start)
return !relay_buf_full(buf);
return buf->chan->cb->subbuf_start(buf, subbuf, prev_subbuf,
prev_padding);
Otherwise this looks good to me:
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
