Re: [PATCH 2/5] rcu: don't check ->donelist in __rcu_pending()

[Srivatsa Vaddagiri <vatsa@in.ibm.com>]

On Mon, Jan 09, 2006 at 11:59:33AM -0800, Paul E. McKenney wrote:
> Hmmm...  So your thought is that __rcu_offline_cpu() moves nxtlist and
> curlist, but not donelist, but then returns to rcu_offline_cpu(), which
> might well do the tasklet_kill_immediate() before the tasklet completed
> processing all of donelist.
> 
> Seems plausible to me.  If true, your patch adding the following statement
> to the ed of __rcu_offline_cpu seems like a reasonable fix:
> 
> 	rcu_move_batch(this_rdp, rdp->donelist, rdp->donetail);
>
> Vatsa, is there something that Oleg and I are missing?

I think this should take care of the CPU Hotplug bug, with the caveat
that the callbacks on ->donelist will wait for additional grace period before 
being invoked (which seems ok).

Oleg, do you want to resend the patch after some testing? 

- vatsa