linux-kernel - Re: [PATCH] sh: replace mutexes which are used in SH-4 user page copy/clear functions in 2.6.22.X

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Date:	Fri, 17 Aug 2007 00:32:47 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Katsuya MATSUBARA <matsu@...l.co.jp>
Cc:	linux-kernel@...r.kernel.org, linuxsh-dev@...ts.sourceforge.net
Subject: Re: [PATCH] sh: replace mutexes which are used in SH-4 user page copy/clear functions in 2.6.22.X

On Tue, Aug 14, 2007 at 05:08:16PM +0900, Katsuya MATSUBARA wrote:
> sh: replace mutexes which are used in SH-4 user page copy/clear
> functions in 2.6.22.X
> 
> This patch replaces mutexes in copy_user_pages() and clear_user_pages() 
> for SH-4 in 2.6.22.X. A 2.6.22.X kernel with CONFIG_PREEMPT_VOLUNTARY=y
> shows the following error because mutexes are sleepable.
> 
This has already been fixed in current git by kmap_coherent(), including
reclaiming the beginning of P3 space for vmalloc.
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