linux-kernel - Re: [Patch RFC 24/37] xfs: semaphore cleanup

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Message-ID: <20090727152558.GC31597@infradead.org>
Date:	Mon, 27 Jul 2009 11:25:58 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Christoph Hellwig <hch@....de>
Subject: Re: [Patch RFC 24/37] xfs: semaphore cleanup

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..

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