linux-kernel - Re: still nfs problems [Was: Linux 2.6.37-rc8]

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Message-ID: <4D2AFF29.4060008@pengutronix.de>
Date:	Mon, 10 Jan 2011 13:44:25 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
CC:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Marc Kleine-Budde <m.kleine-budde@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org,
	Parisc List <linux-parisc@...r.kernel.org>,
	linux-arch@...r.kernel.org
Subject: Re: still nfs problems [Was: Linux 2.6.37-rc8]

On 01/09/2011 12:15 AM, Trond Myklebust wrote:
> From 8b2e60cef5c65eef41ab61286f62dec6bfb1ac27 Mon Sep 17 00:00:00 2001
> From: Trond Myklebust <Trond.Myklebust@...app.com>
> Date: Sat, 8 Jan 2011 17:45:38 -0500
> Subject: [PATCH] NFS: Don't use vm_map_ram() in readdir
> 
> vm_map_ram() is not available on NOMMU platforms, and causes trouble
> on incoherrent architectures such as ARM when we access the page data
> through both the direct and the virtual mapping.
> 
> The alternative is to use the direct mapping to access page data
> for the case when we are not crossing a page boundary, but to copy
> the data into a linear scratch buffer when we are accessing data
> that spans page boundaries.
> 
> Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Tested-by: Marc Kleine-Budde <mkl@...gutronix.de>

..on AT91 (armv5)

regards, Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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