Messages in this thread | | | Subject | Re: [PATCH] mm/autonuma: don't use set_pte_at when updating protnone ptes | From | Rik van Riel <> | Date | Mon, 06 Feb 2017 13:46:22 -0500 |
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On Mon, 2017-02-06 at 22:36 +0530, Aneesh Kumar K.V wrote: > Architectures like ppc64, use privilege access bit to mark pte non > accessible. > This implies that kernel can do a copy_to_user to an address marked > for numa fault. > This also implies that there can be a parallel hardware update for > the pte. > set_pte_at cannot be used in such scenarios. Hence switch the pte > update to use ptep_get_and_clear and set_pte_at combination. > > Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Rik van Riel <riel@redhat.com>
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