RE: [PATCH] iommu/iova: Free all CPU rcache for retry when iova alloc failure

On Fri, 2022-03-04 at 14:03 +0000, Robin Murphy wrote:

OK, so either there's a mystery bug where IOVAs somehow get freed on offline CPUs, or the hotplug notifier isn't working correctly, or you've contrived a situation where alloc_iova_fast() is actually racing against iova_cpuhp_dead(). In the latter case, the solution is "don't do that".

This change should not be necessary.

Thanks, Robin.

Hi Robin,

You are right, kernel 5.15 already has this patch, but kernel 5.10 not contain.

Thanks, Yunfei.