linux-kernel - Re: PAGE_SIZE Availability Inconsistency

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Message-ID: <20070308160852.GB9916@infradead.org>
Date:	Thu, 8 Mar 2007 16:08:52 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Christoph Hellwig <hch@...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 07:53:49AM -0800, Arjan van de Ven wrote:
> > > > PAGE_SIZE should not be available at all.  Please use getpagesize()
> > > > instead.
> > > 
> > > While I agree, NBPG is a bit of a problem, although it's only needed for aout 
> > > coredumps AFAICT, but still needed to compile e.g. gdb.
> > 
> > So we should export this one with an arbitrary value (on multiple page
> > size architectures) and a warning, maybe even an __deprecated attached to
> > it.
> 
> if we think the kernel should export this one, we could do
> 
> #ifndef __KERNEL__
> #define PAGE_SIZE getpagesize()
> #endif

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.
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