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Message-Id: <1195389230.6747.5.camel@twins>
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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