Re: RFC [PATCH] SMP: Don't schedule tasks on inactive cpu(s)

Peter Zijlstra
2012-02-29T11:03:19Z

On Wed, 2012-02-29 at 11:42 +0100, Jonas Aaberg wrote:
> This patch removes the ability to schedule tasks on cpus that are online,
> but not active. The reason for this patch is that during cpu hotplug
> on ARM (atleast) there is a short window where cpuX (X > 0) is online, but
> busy-waiting on cpu0 to put it active, meanwhile cpu0 can be interrupted
> and try to schedule something on the cpu that is busy checking its active bit.

https://lkml.org/lkml/2011/12/15/255

that one?

I _think_ its correct, but it would be so good if someone else could
verify.