Re: [Xen-devel] [PATCH v1 2/2] xen/arm: Fix deadlock in on_selected_cpus function

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-01-27 at 19:00 +0000, Stefano Stabellini wrote:
> Alternatively, as Ian suggested, we could increase the priotiry of SGIs
> but I am a bit wary of making that change at RC2.

I'm leaning the other way -- I'm wary of open coding magic locking
primitives to work around this issue on a case by case basis. It's just
too subtle IMHO.

The IPI and cross CPU calling primitives are basically predicated on
those IPIs interrupting normal interrupt handlers.

Ian.


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