Re: [Fastboot] Re: [PATCH][4/6]Register snapshotting before kexec boot

[Srivatsa Vaddagiri]

On Thu, Sep 16, 2004 at 08:41:13AM +0000, Dipankar Sarma wrote:
> On Wed, Sep 15, 2004 at 02:27:22PM -0700, Andrew Morton wrote:
> > Is dodgy wrt CPU hotplug, but there's not a lot we can do about that
> > in this context, I expect.  Which is a shame, given that CPU hotplug
> > is a likely time at which to be taking a crashdump ;)
> 
> If Hari disables preemption during this entire section of code,
> he should be safe from CPU hotplug, AFAICS. The stop machine
> threads will never get to run on that CPU.

This will work for CPU remove, not CPU add, since the later
is not atomic (yet). 

Rusty, do you think it would be worthwhile making CPU add atomic?
I can give it a shot :)

-- 


Thanks and Regards,
Srivatsa Vaddagiri,
Linux Technology Center,
IBM Software Labs,
Bangalore, INDIA - 560017
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