linux-kernel - Re: [BUG on PREEMPT_RT, 2.6.23.1-rt5] in rt-mutex code and signals

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Message-ID: <20071118222620.GN66820511@sgi.com>
Date:	Mon, 19 Nov 2007 09:26:20 +1100
From:	David Chinner <dgc@....com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Daniel Walker <dwalker@...sta.com>, Ingo Molnar <mingo@...e.hu>,
	Remy Bohmer <linux@...mer.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	RT <linux-rt-users@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dave Chinner <dgc@....com>
Subject: Re: [BUG on PREEMPT_RT, 2.6.23.1-rt5] in rt-mutex code and signals

On Sun, Nov 18, 2007 at 01:33:50PM +0100, Peter Zijlstra wrote:
> 
> On Sat, 2007-11-17 at 10:12 -0800, Daniel Walker wrote:
> 
> > What specifically is wrong with dev->sem ?
> 
> Nothing really, other than that they use semaphores to avoid lockdep :-/
> 
> I think I know how to annotate this, after Alan Stern explained all the
> use cases, but I haven't come around to implementing it. Hope to do that
> soonish.
> 
> Another real semaphore user is XFS, they really use the down/up
> asymmetry that semaphores allow, last time I spoke with Dave Chinner he
> didn't know a way around this.

Hasn't changed recently. We could convert some to completions, but
others are much more difficult.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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