From: Christoph Hellwig <hch@ns.caldera.de>
To: David Pinedo <dp@fc.hp.com>
Cc: linux-mm@kvack.org
Subject: Re: Running out of vmalloc space
Date: Fri, 18 May 2001 18:44:59 +0200 [thread overview]
Message-ID: <20010518184459.A14299@caldera.de> (raw)
In-Reply-To: <3B045546.312BA42E@fc.hp.com>; from dp@fc.hp.com on Thu, May 17, 2001 at 04:48:38PM -0600
On Thu, May 17, 2001 at 04:48:38PM -0600, David Pinedo wrote:
> Unfortunately, yes. It has to be in the kernel's virtual address space,
> because the kernel graphics driver initiates DMAs to and from the
> graphics board, which can only be done from the kernel using locked down
> physical memory.
Take a look at drivers/char/raw.c on how to lock down userpages.
Christoph
--
Of course it doesn't work. We've performed a software upgrade.
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next prev parent reply other threads:[~2001-05-18 16:44 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-17 17:13 David Pinedo
2001-05-17 17:39 ` Stephen C. Tweedie
2001-05-17 22:48 ` David Pinedo
2001-05-18 11:24 ` Andi Kleen
2001-05-18 11:53 ` Stephen C. Tweedie
2001-05-18 16:44 ` Christoph Hellwig [this message]
2001-05-22 23:15 ` David Pinedo
2001-05-23 9:35 ` Stephen C. Tweedie
2001-05-23 16:14 ` David Pinedo
2001-05-23 16:45 ` Stephen C. Tweedie
2001-05-26 5:13 ` Andrew Morton
2001-05-17 19:16 ` Matti Aarnio
2001-05-17 19:23 ` Christoph Hellwig
2001-05-17 20:10 ` Matti Aarnio
2001-05-17 18:51 Hua Ji
2001-05-17 20:17 ` Andi Kleen
2001-05-17 21:58 Hua Ji
2001-05-18 8:21 ` Matti Aarnio
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