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

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Date:	Fri, 13 May 2011 16:07:07 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Kevin Cernekee <cernekee@...il.com>
Cc:	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 Sat, Apr 16, 2011 at 09:44:29AM -0700, Kevin Cernekee wrote:

> Reuse more of the same definitions for the non-RIXI and RIXI cases.  This
> avoids having special cases for kernel_uses_smartmips_rixi cluttering up
> the pgtable*.h files.
> 
> On hardware that does not support RI/XI, EntryLo bits 31:30 / 63:62 will
> remain unset and RI/XI permissions will not be enforced.

Nice idea but it breaks on 64-bit hardware running 32-bit kernels.  On
those the RI/XI bits written to c0_entrylo0/1 31:30 will be interpreted as
physical address bits 37:36.

I'm removing this patch series from the 2.6.40 patch queue until we can
sort this out.

  Ralf
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