Re: [PATCH 1/3] dax: introduce dax_operation dax_clear_poison

Looks good, Reviewed-by: Christoph Hellwig

[PATCH 1/3] dax: introduce dax_operation dax_clear_poison

Though not all dax backend hardware has the capability of clearing poison on the fly, but dax backed by Intel DCPMEM has such capability, and it's desirable to, first, speed up repairing by means of it; second, maintain backend continuity instead of fragmenting it in search for clean blocks.