[PATCH v2 15/45] rcu: Use get/put_online_cpus_atomic() to prevent CPU offline

Paul E. McKenney paulmck at linux.vnet.ibm.com
Thu Jun 27 00:45:24 EST 2013


On Wed, Jun 26, 2013 at 03:29:40PM +0100, David Laight wrote:
> > Once stop_machine() is gone from the CPU offline path, we won't be able
> > to depend on disabling preemption to prevent CPUs from going offline
> > from under us.
> 
> Could you use an rcu-like sequence so that disabling pre-emption
> would be enough?
> 
> Something like rebuilding the cpu list, then forcing yourself
> to run on all the cpu.
> 
> That would be far less intrusive.

Maybe...  I must defer to Srivatsa on this question.

							Thanx, Paul



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