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SubjectRe: [RFC 2/8] shmem: convert to use folio_test_hwpoison()
On Fri, Apr 21, 2023 at 8:05 PM Luis Chamberlain <mcgrof@kernel.org> wrote:
>
> On Fri, Apr 21, 2023 at 11:42:53PM +0100, Matthew Wilcox wrote:
> > On Fri, Apr 21, 2023 at 02:43:54PM -0700, Luis Chamberlain wrote:
> > > The PageHWPoison() call can be converted over to the respective folio call
> > > folio_test_hwpoison(). This introduces no functional changes.
> >
> > Um, no. Nobody should use folio_test_hwpoison(), it's a nonsense.
> >
> > Individual pages are hwpoisoned. You're only testing the head page
> > if you use folio_test_hwpoison(). There's folio_has_hwpoisoned() to
> > test if _any_ page in the folio is poisoned. But blindly converting
> > PageHWPoison to folio_test_hwpoison() is wrong.
>
> Thanks! I don't see folio_has_hwpoisoned() though.

We do have PageHasHWPoisoned(), which indicates at least one subpage
is hwpoisoned in the huge page.

You may need to add a folio variant.

>
> Luis
>

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