linux-kernel - Re: PAGE_SIZE Availability Inconsistency

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Message-ID: <20070306092917.GA5226@infradead.org>
Date:	Tue, 6 Mar 2007 09:29:17 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	David Brown <dmlb2000@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: PAGE_SIZE Availability Inconsistency

On Mon, Mar 05, 2007 at 03:55:06PM -0800, David Brown wrote:
> I was rtfc'ing the code one day and noticed somethings about the
> PAGE_SIZE define that is kinda inconsistent around its relative
> location to the __KERNEL__ define.
> 
> On some architectures the PAGE_SIZE is outside the __KERNEL__ define
> (i386 and x86_64) and on others its inside the define (ia64 and
> powerpc).  I was wondering if this is because the powerpc and ia64
> architectures have dynamic page sizes so that's why they can't export
> PAGE_SIZE outside __KERNEL__.
> 
> I'm kinda wondering how I'm supposed to write portable user-space code
> if I want to use the PAGE_SIZE define on different architectures.

PAGE_SIZE should not be available at all.  Please use getpagesize()
instead.
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