linux-kernel - Re: Kernel rwlock design, Multicore and IGMP

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Message-ID: <1289688723.2109.396.camel@laptop>
Date:	Sat, 13 Nov 2010 23:52:03 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Cypher Wu <cypher.w@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Kernel rwlock design, Multicore and IGMP

On Thu, 2010-11-11 at 21:49 +0800, Cypher Wu wrote:
> I'm using TILEPro and its rwlock in kernel is a liitle different than
> other platforms. It have a priority for write lock that when tried it
> will block the following read lock even if read lock is hold by
> others. 

That's a bug, rwlock_t must most definitely be a read preference lock,
there's tons of code depending on that.
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