On Tue, Apr 02, 2019 at 01:55:03PM +0800, Qiang Yu wrote: > Thanks, patch is: > Reviewed-by: Qiang Yu <yuq825@xxxxxxxxx> This looks like a fairly naive conversion from the old IDR API to the XArray API. You should be able to remove mgr->lock entirely, relying on the xa_lock for synchronising free and get. If you think it's worth it, you could even use kfree_rcu() to free the ctx and kref_get_unless_zero() and then your get path would be lock-free.
