Date: Sat, 28 May 2005 17:16:26 +0100
From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Christoph Hellwig <hch@infradead.org>, linux-kernel@vger.kernel.org
Subject: Re: Will __pa(vmalloc()) ever work?
Message-ID: <20050528171626.B4711@flint.arm.linux.org.uk>
Mail-Followup-To: Christoph Hellwig <hch@infradead.org>,
	linux-kernel@vger.kernel.org
References: <4297746C.10900@ammasso.com> <20050527192925.GA8250@infradead.org>
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In-Reply-To: <20050527192925.GA8250@infradead.org>; from hch@infradead.org on Fri, May 27, 2005 at 08:29:25PM +0100
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On Fri, May 27, 2005 at 08:29:25PM +0100, Christoph Hellwig wrote:
> On Fri, May 27, 2005 at 02:26:36PM -0500, Timur Tabi wrote:
> > I have a driver that calls __pa() on an address obtained via vmalloc().  
> > This is not supposed to work, and yet oddly it appears to.  Is there a 
> > possibility, even a remote one, that __pa() will return the correct 
> > physical address for a buffer returned by the vmalloc() function?
> 
> It will return the correct physical address for the start of the buffer.

__pa() is only defined to works on the direct-mapped kernel region.
The fact that it works on some architectures should be viewed as a
bug.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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