From: Timur Tabi <timur.tabi@ammasso.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Will __pa(vmalloc()) ever work?
Date: Fri, 27 May 2005 14:54:53 -0500 [thread overview]
Message-ID: <42977B0D.3040809@ammasso.com> (raw)
In-Reply-To: <20050527192925.GA8250@infradead.org>
Christoph Hellwig wrote:
> 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.
So as long as the vmalloc'd memory fits inside one page, __pa() will always give the
correct address? If so, then can't I just call __pa() for every page in the buffer and
get a list of physical addresses? If I can do that, then how the memory be virtually
contiguous but not physicall contiguous?
> As are physical addresses for anything but low-level architecture code.
I don't understand what that means.
--
Timur Tabi
Staff Software Engineer
timur.tabi@ammasso.com
One thing a Southern boy will never say is,
"I don't think duct tape will fix it."
-- Ed Smylie, NASA engineer for Apollo 13
next prev parent reply other threads:[~2005-05-27 19:55 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 [this message]
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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