On Tue, 2015-03-24 at 11:30 +0100, Michal Hocko wrote:
> On Mon 23-03-15 15:44:40, Jason Low wrote:
> > Commit 38c5ce936a08 converted ACCESS_ONCE usage in gup_pmd_range() to
> > READ_ONCE, since ACCESS_ONCE doesn't work reliably on non-scalar types.
> >
> > This patch removes the rest of the usages of ACCESS_ONCE, and use
> > READ_ONCE for the read accesses. This also makes things cleaner,
> > instead of using separate/multiple sets of APIs.
> >
> > Signed-off-by: Jason Low <jason.low2@xxxxxx>
>
> Makes sense to me. I would prefer a patch split into two parts. One which
> changes potentially dangerous usage of ACCESS_ONCE and the cleanup. This
> will make the life of those who backport patches into older kernels
> easier a bit.
Okay, so have a patch 1 which fixes the following:
pte_t pte = ACCESS_ONCE(*ptep);
pgd_t pgd = ACCESS_ONCE(*pgdp);
and the rest of the changes in the cleanup patch 2?
> I won't insist though.
>
> Acked-by: Michal Hocko <mhocko@xxxxxxx>
Thanks,
Jason
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