linux-kernel - Re: [PATCH 1/4] MIPS: Replace _PAGE_READ with _PAGE_NO

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Date:	Fri, 13 May 2011 23:02:27 -0700
From:	Kevin Cernekee <cernekee@...il.com>
To:	"Jayachandran C." <jayachandranc@...logicmicro.com>
Cc:	Ralf Baechle <ralf@...ux-mips.org>,
	David Daney <ddaney@...iumnetworks.com>,
	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] MIPS: Replace _PAGE_READ with _PAGE_NO_READ

On Fri, May 13, 2011 at 10:13 PM, Jayachandran C.
<jayachandranc@...logicmicro.com> 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.

Would you be able to post your rootfs image?  Are you using
"usr/dev_file_list usr/rootfs" from CONFIG_INITRAMFS_SOURCE?  That
could eliminate one other potential difference between our
configurations.
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