linux-kernel - Re: PAGE_SIZE Availability Inconsistency

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Message-ID: <20070308171212.GA19872@infradead.org>
Date:	Thu, 8 Mar 2007 17:12:12 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	David Brown <dmlb2000@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	gdb@...rceware.org
Subject: Re: PAGE_SIZE Availability Inconsistency

On Thu, Mar 08, 2007 at 09:05:48AM -0800, H. Peter Anvin wrote:
> Christoph Hellwig wrote:
> >No, no no.  We should never export PAGE_SIZE.  We might export NBPG
> >as deprecated symbol for gdb if it really needs it, but that should
> >happen only on a.out systems, and it it should be a true constant,
> >not depending on PAGE_SIZE.
> >
> >I've Cc'ed the gdb list on whether they have any comments on this
> >issue.
> 
> By the way, it's a massive snafu that the swap area magic number is 
> dependent on PAGE_SIZE.  There is absolutely no good reason for that.

Yeah, now that you mention it I remember having problems with that
in the past.  We should probably create a new swap format that avoids
this problem.  I'll put it on my ever growing todo list.
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