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Re: [PATCH] 64K page size

To: Peter Watkins <treestem@gmail.com>
Subject: Re: [PATCH] 64K page size
From: Thiemo Seufer <ths@networkno.de>
Date: Wed, 23 Aug 2006 17:00:11 +0100
Cc: linux-mips@linux-mips.org, Ralf Baechle <ralf@linux-mips.org>
In-reply-to: <44EC7125.7000000@gmail.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <44EC7125.7000000@gmail.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.13 (2006-08-11)
Peter Watkins wrote:
> Hello,
> 
> There are a number of changes required to support larger page sizes, but 
> this one I thought worth sending up right away.
> 
> The code in pgtable-64.h assumes TASK_SIZE is always bigger than a first 
> level PGDIR_SIZE. This is not the case for 64K pages, where task size is 
> 40 bits (1TB) and a pgd entry can map 42 bits. This leads to 
> USER_PTRS_PER_PGD being zero for 64K pages.
> 
> If there is interest in other changes for 64K pages, I can send more.

Please do so. :-)


Thiemo

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