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SubjectRe: [patch 1/4] hotplug: Prevent alloc/free of irq descriptors during cpu up/down
On Tue, 14 Jul 2015, Boris Ostrovsky wrote:
> > Prevent allocation and freeing of interrupt descriptors accross cpu
> > hotplug.
>
>
> This breaks Xen guests that allocate interrupt descriptors in .cpu_up().

And where exactly does XEN allocate those descriptors?

> Any chance this locking can be moved into arch code?

No.

> (The patch doesn't appear to have any side effects for the down path since Xen
> guests deallocate descriptors in __cpu_die()).

Exact place please.

Thanks,

tglx


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