Re: [PATCH 2/2] lockdep: Don't only check recursive read locks once in a sequence
From
Peter Zijlstra <>
Date
Thu, 19 Nov 2009 18:13:48 +0100
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.