On Thu, 6 Dec 2012 20:22:42 -0500 Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> wrote:
> > --- a/mm/rmap.c~hwpoison-hugetlbfs-fix-rss-counter-warning-fix
> > +++ a/mm/rmap.c
> > @@ -1249,14 +1249,14 @@ int try_to_unmap_one(struct page *page,
> > update_hiwater_rss(mm);
> >
> > if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) {
> > - if (PageHuge(page))
> > - ;
> > - else if (PageAnon(page))
> > - dec_mm_counter(mm, MM_ANONPAGES);
> > - else
> > - dec_mm_counter(mm, MM_FILEPAGES);
> > - set_pte_at(mm, address, pte,
> > - swp_entry_to_pte(make_hwpoison_entry(page)));
> > + if (!PageHuge(page)) {
> > + if (PageAnon(page))
> > + dec_mm_counter(mm, MM_ANONPAGES);
> > + else
> > + dec_mm_counter(mm, MM_FILEPAGES);
> > + set_pte_at(mm, address, pte,
> > + swp_entry_to_pte(make_hwpoison_entry(page)));
> > + }
>
> This set_pte_at() should come outside the if-block, or error containment
> does not work.
Doh. C is really hard!
--- a/mm/rmap.c~hwpoison-hugetlbfs-fix-rss-counter-warning-fix-fix
+++ a/mm/rmap.c
@@ -1254,9 +1254,9 @@ int try_to_unmap_one(struct page *page,
dec_mm_counter(mm, MM_ANONPAGES);
else
dec_mm_counter(mm, MM_FILEPAGES);
- set_pte_at(mm, address, pte,
- swp_entry_to_pte(make_hwpoison_entry(page)));
}
+ set_pte_at(mm, address, pte,
+ swp_entry_to_pte(make_hwpoison_entry(page)));
} else if (PageAnon(page)) {
swp_entry_t entry = { .val = page_private(page) };
_
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