On Tue, 4 Feb 2014 16:02:39 -0800 (PST) David Rientjes <rientjes@xxxxxxxxxx> wrote:
> Commit bf6bddf1924e ("mm: introduce compaction and migration for ballooned
> pages") introduces page_count(page) into memory compaction which
> dereferences page->first_page if PageTail(page).
>
> Introduce a store memory barrier to ensure page->first_page is properly
> initialized so that code that does page_count(page) on pages off the lru
> always have a valid p->first_page.
Could we have a code comment please? Even checkpatch knows this rule!
> Reported-by: Holger Kiehl <Holger.Kiehl@xxxxxx>
What did Holger report?
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