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

[Peter Zijlstra]

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.

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