linux-kernel - Re: [PATCH] mm/autonuma: don't use set_pte

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Date:   Mon, 06 Feb 2017 13:46:22 -0500
From:   Rik van Riel <riel@...riel.com>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        akpm@...ux-foundation.org, Mel Gorman <mgorman@...hsingularity.net>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/autonuma: don't use set_pte_at when updating
 protnone ptes

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@...ux.vnet.ibm.com>

Acked-by: Rik van Riel <riel@...hat.com>

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