linux-kernel - Re: PAGE_SIZE Availability Inconsistency

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Message-ID: <45F0E309.70403@zytor.com>
Date:	Thu, 08 Mar 2007 20:31:05 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	David Miller <davem@...emloft.net>
CC:	anton@...ba.org, hch@...radead.org, arjan@...radead.org,
	zippel@...ux-m68k.org, dmlb2000@...il.com,
	linux-kernel@...r.kernel.org, gdb@...rceware.org
Subject: Re: PAGE_SIZE Availability Inconsistency

David Miller wrote:
> From: "H. Peter Anvin" <hpa@...or.com>
> Date: Thu, 08 Mar 2007 20:18:28 -0800
> 
>> Anton Blanchard wrote:
>>> The other option is to create a v3 swap format that doesnt use any
>>> PAGE_SIZE parameters.
>> The best thing to do would be to look for the magic both at PAGE_SIZE 
>> (for compatibility) and MIN_PAGE_SIZE (for sanity.)
> 
> That might work, but a large part of me says to go for v3
> and do it cleanly.

The advantage would be that it wouldn't require a v3 for platforms for 
which MIN_PAGE_SIZE == PAGE_SIZE, which accounts for a very large 
percentage of systems.

You still have to look for the darn magic in two places, so there is no 
reason for it to be different.

	-hpa
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