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SubjectRe: [PATCH] Revert "proc: clear_refs: do not clear reserved pages"
On Thu, Apr 12, 2012 at 06:51:10PM +0100, Hugh Dickins wrote:
> On Thu, 12 Apr 2012, Will Deacon wrote:
>
> > This reverts commit 85e72aa5384b1a614563ad63257ded0e91d1a620, which was
> > a quick fix suitable for -stable until ARM had been moved over to the
> > gate_vma mechanism:
> >
> > https://lkml.org/lkml/2012/1/14/55
> >
> > With commit f9d4861f ("ARM: 7294/1: vectors: use gate_vma for vectors user
> > mapping"), ARM does now use the gate_vma, so the PageReserved check can
> > be removed from the proc code.
> >
> > Cc: Nicolas Pitre <nico@linaro.org>
> > Signed-off-by: Will Deacon <will.deacon@arm.com>
>
> Oh, great, I'm glad that worked out: thanks a lot for looking after it,
> Will, and now cleaning up afterwards.
>
> Acked-by: Hugh Dickins <hughd@google.com>

Thanks, Hugh. I guess it's easiest if Andrew picks this one up as he took
the original patch.

Will

> > ---
> > fs/proc/task_mmu.c | 3 ---
> > 1 files changed, 0 insertions(+), 3 deletions(-)
> >
> > diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> > index 2b9a760..2d60492 100644
> > --- a/fs/proc/task_mmu.c
> > +++ b/fs/proc/task_mmu.c
> > @@ -597,9 +597,6 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
> > if (!page)
> > continue;
> >
> > - if (PageReserved(page))
> > - continue;
> > -
> > /* Clear accessed and referenced bits. */
> > ptep_test_and_clear_young(vma, addr, pte);
> > ClearPageReferenced(page);
> > --
> > 1.7.4.1
> >
> >
>


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