From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Hugh Dickins <hugh@veritas.com>
Cc: Ingo Molnar <mingo@elte.hu>,
William Lee Irwin III <wli@movementarian.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: Re: pud_bad vs pud_bad
Date: Thu, 05 Feb 2009 12:42:07 -0800 [thread overview]
Message-ID: <498B4F1F.5070306@goop.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0902051921150.30938@blonde.anvils>
Hugh Dickins wrote:
> However... I forget how the folding works out. The pgd in the 32-bit
> PAE case used to have just the pfn and the present bit set in that
> little array of four entries: if pud_bad() ends up getting applied
> to that, I guess it will blow up.
>
Ah, that's a good point.
> If so, my preferred answer would actually be to make those 4 entries
> look more like real ptes; but you may think I'm being a bit silly.
>
Hardware doesn't allow it. It will explode (well, trap) if you set
anything other than P in the top level.
By the by, what are the chances we'll be able to deprecate non-PAE 32-bit?
J
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next prev parent reply other threads:[~2009-02-05 20:42 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-05 18:23 Jeremy Fitzhardinge
2009-02-05 18:43 ` Ingo Molnar
2009-02-05 18:54 ` Jeremy Fitzhardinge
2009-02-05 19:10 ` Ingo Molnar
2009-02-05 19:26 ` Jeremy Fitzhardinge
2009-02-05 19:31 ` Ingo Molnar
2009-02-05 19:38 ` Hugh Dickins
2009-02-05 19:49 ` Ingo Molnar
2009-02-05 19:58 ` wli
2009-02-05 20:14 ` Hugh Dickins
2009-02-05 20:56 ` wli
2009-02-05 21:09 ` Hugh Dickins
2009-02-05 20:12 ` Hugh Dickins
2009-02-05 20:42 ` Jeremy Fitzhardinge [this message]
2009-02-05 20:51 ` Hugh Dickins
2009-02-05 21:05 ` Jeremy Fitzhardinge
2009-02-05 21:50 ` Ingo Molnar
2009-02-05 22:07 ` Jeremy Fitzhardinge
2009-02-05 23:42 ` Ingo Molnar
2009-02-06 0:08 ` Jeremy Fitzhardinge
2009-02-06 0:50 ` Ingo Molnar
2009-02-05 20:57 ` Ingo Molnar
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