RE: PG_reserved bug

[Amir Hermelin]

Can't I just not use the reserved bit (therefore effectively use the
refcount), and keep the minimal count at 1 or 2?  Will that have the same
effect as setting the reserved bit?

Amir.

-----Original Message-----
From: linux-kernel-owner@xxxxxxxxxxxxxxx
[mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] On Behalf Of William Lee Irwin
III
Sent: Wednesday, November 26, 2003 2:50 PM
To: Amir Hermelin
Cc: linux-kernel@xxxxxxxxxxxxxxx
Subject: Re: PG_reserved bug


On Wed, Nov 26, 2003 at 02:45:06PM +0200, Amir Hermelin wrote:
> Ok, fair enough.  According to what you say, this behavior won't 
> change in 2.6.  So, I'm still left with my second question: since I do 
> access the pages from several places in my module, and I want to use 
> the refcount field of the struct page (and not have to wrap the pages 
> in another structure) so I know when my page is no longer referenced, 
> how can I make sure it's 'safe' to not use the reserved bit?

It looks like you'll have to wrap the pages in another structure. The
refcounts for reserved pages are effectively meaningless.


-- wli
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