On Wed, Jan 15, 2020 at 04:36:14PM +0100, Christoph Hellwig wrote:

> synchronous and currently hack that up, so a version of the percpu_ref
> that actually waits for the other references to away like we hacked
> up various places seems to exactly suit your requirements.

Ah, yes, sounds like a similar goal, many cases I'm thinking about
also hack up a kref to trigger a completion to make it


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