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Date: Mon, 27 Jul 2009 11:25:58 -0400
From: Christoph Hellwig <hch@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>,
       Peter Zijlstra <peterz@infradead.org>, Christoph Hellwig <hch@lst.de>
Subject: Re: [Patch RFC 24/37] xfs: semaphore cleanup
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References: <20090726081459.455111897@linutronix.de> <20090726081556.395690256@linutronix.de>
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On Sun, Jul 26, 2009 at 08:19:03AM -0000, Thomas Gleixner wrote:
> bp->b_sema claims to be a mutex, but it is a semaphore with non
> obvious semantics. Make it a real semaphore.

It is a binary mutex in the classical CS sense, just not unlocked by
the same thread as expected by the Linux mutexes..