linux-kernel - Re: + down_write-preserve-local-irqs.patch added to -mm tree

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Date:	Wed, 20 Dec 2006 11:54:23 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...l.org
Subject: Re: + down_write-preserve-local-irqs.patch added to -mm tree

On Wed, 2006-12-20 at 02:38 -0800, akpm@...l.org wrote:
> The patch titled
>      down_write(): preserve local irqs
> has been added to the -mm tree.  Its filename is
>      down_write-preserve-local-irqs.patch
> 
> See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
> out what to do about this
> 
> ------------------------------------------------------
> Subject: down_write(): preserve local irqs

excuse me? Am I missing something here?

down_write() is a sleeping function, right? what business does it have
to be *ever* called with irqs off?

if the answer is "none whatsoever", what good is saving irq state then?



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