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Re: Does Linux invalidate TLB entries?

To: Matthew Dharm <mdharm@momenco.com>
Subject: Re: Does Linux invalidate TLB entries?
From: Ralf Baechle <ralf@oss.sgi.com>
Date: Wed, 30 Jan 2002 12:02:51 +0100
Cc: Linux-MIPS <linux-mips@oss.sgi.com>
In-reply-to: <NEBBLJGMNKKEEMNLHGAIGECBCFAA.mdharm@momenco.com>; from mdharm@momenco.com on Tue, Jan 29, 2002 at 05:03:42PM -0800
References: <NEBBLJGMNKKEEMNLHGAIGECBCFAA.mdharm@momenco.com>
Sender: owner-linux-mips@oss.sgi.com
User-agent: Mutt/1.2.5i
On Tue, Jan 29, 2002 at 05:03:42PM -0800, Matthew Dharm wrote:

> I'm still trying to track down the cause of all my problems, so I'm
> going over the RM7000 errata.
> 
> I see one here that I'm not sure if it's a problem or not.  It only
> applies to OSes which invalidate TLB entries and thus will cause TLB
> Invalid exceptions (as opposed to a TLB refill exception, I think).
> 
> So, does Linux invalidate TLBs?  I've been looking at the code, and I
> think the answer is 'no', but I'm not really sure.

Yes, Linux may create TLB entries with V=0.

  Ralf

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