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

[David Chinner]

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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/