Re: [PATCH] Run softirqs on proper processor on offline

[Zwane Mwaikambo]

On Tue, 15 Feb 2005, Andrew Morton wrote:

> Zwane Mwaikambo <zwane@xxxxxxxxxxxxxxxx> wrote:
> >
> > Ensure that we only offline the processor when it's safe and never run 
> >  softirqs in another processor's ksoftirqd context. This also gets rid of 
> >  the warnings in ksoftirqd on cpu offline.
> 
> I don't get it.  ksoftirqd is pinned to its cpu, so why does any of this
> matter?

We take down ksoftirqds at CPU_DEAD time, so there is a brief period 
whereupon there is a ksoftirqd thread for an offline processor, it is at 
this point that ->cpus_allowed won't have it pinned anymore. An online 
processor would then take down that ksoftirqd and exit it.
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