Implement ->read_iter so that splice can be used on this file.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 static const struct proc_ops stat_proc_ops = {
        .proc_flags     = PROC_ENTRY_PERMANENT,
        .proc_open      = stat_open,
-       .proc_read      = seq_read,
+       .proc_read_iter = seq_read_iter,
        .proc_lseek     = seq_lseek,
        .proc_release   = single_release,
 };