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Re: CVS Update@oss.sgi.com: linux

To: Dominic Sweetman <dom@algor.co.uk>
Subject: Re: CVS Update@oss.sgi.com: linux
From: Ralf Baechle <ralf@oss.sgi.com>
Date: Tue, 21 Nov 2000 04:39:03 +0100
Cc: Harald Koerfgen <Harald.Koerfgen@home.ivm.de>, linux-cvs@oss.sgi.com, linux-mips@oss.sgi.com, linux-mips@fnet.fr
In-reply-to: <200011191516.PAA00336@gladsmuir.algor.co.uk>; from dom@algor.co.uk on Sun, Nov 19, 2000 at 03:16:33PM +0000
References: <20001118132233Z553804-494+838@oss.sgi.com> <XFMail.001118180639.Harald.Koerfgen@home.ivm.de> <20001118182114.A19710@bacchus.dhis.org> <200011191516.PAA00336@gladsmuir.algor.co.uk>
On Sun, Nov 19, 2000 at 03:16:33PM +0000, Dominic Sweetman wrote:

> ll/sc between CPUs certainly won't work for uncached accesses, since
> they rely on the cache coherency protocols.
> 
> On a uniprocessor CPU the ll/sc link is typically broken on any
> exception.  You'd have to try very hard to design the CPU so that it
> would work any differently for cached and uncached accesses.

Ok, so now CONFIG_MIPS_UNCACHED is only selectable for UP kernels.

  Ralf

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