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

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Date:	Sun, 18 Nov 2007 13:33:50 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	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 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.

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