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SubjectRe: [PATCH 2/12] mm: let swap use exceptional entries
On Tue, 14 Jun 2011 03:43:47 -0700 (PDT) Hugh Dickins <hughd@google.com> wrote:

> --- linux.orig/mm/filemap.c 2011-06-13 13:26:44.430284135 -0700
> +++ linux/mm/filemap.c 2011-06-13 13:27:34.526532556 -0700
> @@ -717,9 +717,12 @@ repeat:
> page = radix_tree_deref_slot(pagep);
> if (unlikely(!page))
> goto out;
> - if (radix_tree_deref_retry(page))
> + if (radix_tree_exception(page)) {
> + if (radix_tree_exceptional_entry(page))
> + goto out;
> + /* radix_tree_deref_retry(page) */
> goto repeat;
> -
> + }
> if (!page_cache_get_speculative(page))
> goto repeat;

All the crap^Wnice changes made to filemap.c really need some comments,
please. Particularly when they're keyed off the bland-sounding
"radix_tree_exception()". Apparently they have something to do with
swap, but how is the poor reader to know this?

Also, commenting out a function call might be meaningful information for
Hugh-right-now, but for other people later on, they're just a big WTF.



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