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?
Date: Sat, 28 May 2005 17:16:26 +0100 [thread overview]
Message-ID: <20050528171626.B4711@flint.arm.linux.org.uk> (raw)
In-Reply-To: <20050527192925.GA8250@infradead.org>; from hch@infradead.org on Fri, May 27, 2005 at 08:29:25PM +0100
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
next prev parent reply other threads:[~2005-05-28 16:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-27 19:26 Will __pa(vmalloc()) ever work? Timur Tabi
2005-05-27 19:29 ` Christoph Hellwig
2005-05-27 19:54 ` Timur Tabi
2005-05-27 20:31 ` Arnd Bergmann
2005-05-28 16:16 ` Russell King [this message]
2005-05-30 9:38 ` Gerd Knorr
2005-05-31 15:51 ` Timur Tabi
2005-05-31 16:13 ` Gerd Knorr
2005-05-31 18:59 ` Timur Tabi
2005-05-31 20:01 ` Russell King
2005-05-31 20:44 ` Brian Gerst
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