Re: [PATCH 2/2] lockdep: Don't only check recursive read locksonce in a sequence

[Frederic Weisbecker]

On Thu, Nov 19, 2009 at 06:13:48PM +0100, Peter Zijlstra wrote:
> On Thu, 2009-11-19 at 16:55 +0100, Frederic Weisbecker wrote:
> > And btw I
> > don't understand why rwsem read locks are not considered as
> > recursive in lockdep. 
> 
> Because they're not.
> 
> rwsems are FIFO fair, so a double read can deadlock when there's a
> pending writer inbetween.
> 


Aah ok. That's the subtle thing I was missing :)

Thanks.

--
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/