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Re: [Xen-devel] [PATCH v4 01/13] x86/IRQ: deal with move-in-progress state in fixup_irqs()
- To: Jan Beulich <JBeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 19 Jul 2019 14:20:55 +0100
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- Cc: Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 19 Jul 2019 13:21:04 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 16/07/2019 08:37, Jan Beulich wrote:
> The flag being set may prevent affinity changes, as these often imply
> assignment of a new vector. When there's no possible destination left
> for the IRQ, the clearing of the flag needs to happen right from
> fixup_irqs().
>
> Additionally _assign_irq_vector() needs to avoid setting the flag when
> there's no online CPU left in what gets put into ->arch.old_cpu_mask.
> The old vector can be released right away in this case.
>
> Also extend the log message about broken affinity to include the new
> affinity as well, allowing to notice issues with affinity changes not
> actually having taken place. Swap the if/else-if order there at the
> same time to reduce the amount of conditions checked.
>
> At the same time replace two open coded instances of the new helper
> function.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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