Re: [PATCH] markers: fix unregister bug and reenter bug

[Mathieu Desnoyers]

Hi Lai,

I'll have to nack this fix :

One fix I already posted makes sure every marker unregister callers call
synchronize_sched() _at some point_ before module unload. It thus makes
sure we can do batch unregistration without doing multiple
synchronize_sched calls.

Also, there is no need to do the synchronize_sched with the marker mutex
held. call_rcu_sched takes care of making sure the previous quiescent
state is over before calling kfree. This means that when we return from
the register/unregister functions, there may still be markers "in
flight" using the old markers. Again, why would it be a problem ?

Thanks,

Mathieu

P.S. : I'll send along the patches I am referring to. Ingo, those should
probably be merged if they are not in -tip already.

-- 
Mathieu Desnoyers
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