linux-kernel - Re: [PATCH 2.6.25.10 1/2] libata: fix locking for kmap

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Message-ID: <20080713112543.2dc9d6f7@lxorguk.ukuu.org.uk>
Date:	Sun, 13 Jul 2008 11:25:43 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Jakub W. Jozwicki" <jozwicki@...er.pl>
Cc:	linux-kernel@...r.kernel.org, jgarzik@...hat.com
Subject: Re: [PATCH 2.6.25.10 1/2] libata: fix locking for kmap_atomic

On Sun, 13 Jul 2008 01:27:36 +0200
"Jakub W. Jozwicki" <jozwicki@...er.pl> wrote:

> Change locking surrounding kmap_atomic from local_irqsave to 
> local_irqsave_nort. This fixes issues with PREEMPT_RT.
>  
> Signed-off-by:  Jakub Jozwicki <jozwicki@...er.pl>

The right way to fix this is to use a bounce buffer. I sent Jeff patches
to do that a couple of times. I'm not sure what has happened to them
since ? So NAK this, we should apply the patch to actually fix the bug
instead.

Jeff ?

Alan
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