linux-kernel - Re: [PATCH -mm] Revoke core code: fix nommu arch compiling error bug

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Message-ID: <8bd0f97a0703271000x2910b2fan573fd37bb45a058d@mail.gmail.com>
Date:	Tue, 27 Mar 2007 13:00:54 -0400
From:	"Mike Frysinger" <vapier.adi@...il.com>
To:	"David Howells" <dhowells@...hat.com>
Cc:	"Pekka J Enberg" <penberg@...helsinki.fi>,
	"Andrew Morton" <akpm@...ux-foundation.org>, bryan.wu@...log.com,
	linux-kernel@...r.kernel.org, "Hugh Dickins" <hugh@...itas.com>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH -mm] Revoke core code: fix nommu arch compiling error bug

On 3/27/07, David Howells <dhowells@...hat.com> wrote:
> Note that it's not possible to shift windows around in response to faults
> because fault reporting is asynchronous - the entire remaining instruction
> queue will be executed *before* the exception is actually raised to the
> kernel.

ah that would limit the usefulness of its application in the kernel
... thanks for the info

> That sounds reasonable.  However, I suspect that most NOMMU CPUs won't be able
> to do that.  In effect you're creating a third option, I think (MMU, NOMMU,
> MPU).

sure, but i'm not sure the MPU option would be mutually exclusive with
NOMMU ... in the Blackfin case, we'd want both ...
-mike
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