From: Christoph Hellwig <hch@infradead.org>
To: linux-kernel@vger.kernel.org
Subject: Re: Will __pa(vmalloc()) ever work?
Date: Fri, 27 May 2005 20:29:25 +0100 [thread overview]
Message-ID: <20050527192925.GA8250@infradead.org> (raw)
In-Reply-To: <4297746C.10900@ammasso.com>
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.
But given that vmalloc is a non-contingous allocator that's pretty useless.
As are physical addresses for anything but low-level architecture code.
next prev parent reply other threads:[~2005-05-27 19:30 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 [this message]
2005-05-27 19:54 ` Timur Tabi
2005-05-27 20:31 ` Arnd Bergmann
2005-05-28 16:16 ` Russell King
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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