linux-kernel - Re: PAGE_SIZE Availability Inconsistency

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Date:	Mon, 5 Mar 2007 16:01:10 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	"David Brown" <dmlb2000@...il.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: PAGE_SIZE Availability Inconsistency

On Mon, 5 Mar 2007 15:55:06 -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.

use 'getpagesize(2)'

---
~Randy
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