Re: [PATCH] [1/16] HWPOISON: Add page flag for poisoned pages

From: Rik van Riel
Date: Fri May 29 2009 - 12:10:51 EST

Andi Kleen wrote:
On Wed, May 27, 2009 at 10:15:10PM +0100, Alan Cox wrote:
On Wed, 27 May 2009 22:12:26 +0200 (CEST)
Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:

Hardware poisoned pages need special handling in the VM and shouldn't be touched again. This requires a new page flag. Define it here.
Why can't you use PG_reserved ? That already indicates the page may not
even be present (which is effectively your situation at that point).

Right now a page must be present with PG_reserved, otherwise /dev/mem, /proc/kcore
lots of other things will explode.

Could we use a combination of, say PG_reserved and
PG_writeback to keep /dev/mem and /proc/kcore from
exploding ?

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