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Re: [PATCH 1/4] MIPS: Replace _PAGE_READ with _PAGE_NO_READ

To: Kevin Cernekee <>
Subject: Re: [PATCH 1/4] MIPS: Replace _PAGE_READ with _PAGE_NO_READ
From: "Jayachandran C." <>
Date: Mon, 16 May 2011 18:27:20 +0530
Cc: Ralf Baechle <>, David Daney <>,
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <> <> <> <> <> <> <> <>
User-agent: Mutt/1.5.20 (2009-06-14)
[dropping linux-kernel of the cc:]

On Fri, May 13, 2011 at 11:02:27PM -0700, Kevin Cernekee wrote:
> On Fri, May 13, 2011 at 10:13 PM, Jayachandran C.
> <> wrote:
> > Can you send me the patchset which works on top of queue with any
> > debugging you want enabled?  I can try that and send you the results.
> >
> > It is also possible that something is broken with the XLR platform code,
> > it is currently almost straight r4k...
> Well, David suggested adding "#define DEBUG 1" at the very top of
> tlbex.c, then booting with "debug" and posting the TLB refill handler
> to make sure the RI/XI code isn't getting enabled.  That seems like a
> reasonable start.  Even if there's no smoking gun, we'd still be able
> to compare our TLB handlers side-by-side.
> Personally I don't have any other leads or patches to try.  These
> changes work fine for me in every configuration I am able to test:
> 32-bit MIPS32 system, 32-bit kernel (non-RIXI)
> 32-bit MIPS32 system, 32-bit kernel (XI)
> 64-bit R5000 system, 32-bit kernel (non-RIXI, with 64-bit physical addresses)
> 64-bit R5000 system, 64-bit kernel (non-RIXI)
> So it's really best for somebody to debug the problem hands-on, on the
> system that showed the issue.

I will try this patch again on top of 'queue' with debugging and send you
an update.  Hope to do it today or tomorrow.


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