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Re: Should /dev/kmem support above 0x80000000 area?

To: Jun Sun <jsun@mvista.com>
Subject: Re: Should /dev/kmem support above 0x80000000 area?
From: Ralf Baechle <ralf@oss.sgi.com>
Date: Sat, 9 Dec 2000 00:32:23 +0100
Cc: linux-mips@oss.sgi.com
In-reply-to: <3A3051C1.DCFC749B@mvista.com>; from jsun@mvista.com on Thu, Dec 07, 2000 at 07:13:05PM -0800
References: <3A3051C1.DCFC749B@mvista.com>
Sender: owner-linux-mips@oss.sgi.com
On Thu, Dec 07, 2000 at 07:13:05PM -0800, Jun Sun wrote:

> Currently one cannot read memory area above 0x80000000 throught /dev/kmem.  In
> fact, an earlier bug would put the process into an infinite loop if you try to
> do that.  That seems to be fixed now.
> 
> It seems to be very useful if we do allow that access.  What do you think?

Actually there is almost nothing left that uses /dev/{mem,kmem} these days.
Nevertheless it's a supported interface, so we have to get it right.

> Ralf, if we do want to enable it - which is pretty simple to do -, should I
> give you the patch or shuld I submit it to somebody else who is maintaining
> /dev/kmem?

Send me the patch and I'll comment.

  Ralf

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