fifo_write
if (bytes != fifo_write(fifo, p, bytes, xilly_memcpy)) {
fifo_write(fifo, (void *)msg, 8, xilly_memcpy);
rc = fifo_write(fifo, (__force void *)userbuf, count,
retval = fifo_write(board, buffer, fast_chunk_size, &num_bytes);
.proc_write = fifo_write,
.proc_write = fifo_write,
.proc_write = fifo_write,