On 03/01/2010 09:42 PM, Mathieu Desnoyers wrote:
* Paolo Bonzini ([email protected]) wrote:
On 03/01/2010 09:14 PM, Mathieu Desnoyers wrote:
These unpaired lock/unlock are causing this problem.
Uh-oh. True.
However, the fact that a thread cannot be unregistered and then
reregistered remains, no?
I fail to see the problem here ? Can you be more specific ?
This sequence fails:
rcu_register_thread();
... some critical sections and grace periods here ...
rcu_unregister_thread();
... nothing uses RCU here...
rcu_register_thread(); // assertion failure on rcu_reader.ctr == 0
Is this also explicitly prohibited? My patch happens to fix this too.
(Of course there's no need to introduce _rcu_thread_{on,off}line, a one
liner is enough).
Paolo
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