Re: [PATCH] sched_ext: Hold DSQ refs for deferred reenqueues

[Hui Su]

Please disregard this posting. This was intended to be v2, but I
accidentally omitted the version tag.

I am preparing v3 to address the review feedback. In particular, it
will serialize exit_dsq() with deferred detach/reference acquisition
using deferred_reenq_lock, and keep final DSQ reclamation out of the
deferred path while the rq raw spinlock is held.

The revised design keeps a single DSQ refcount and the existing
rcu_head, without polling the refcount from repeated RCU callbacks.

I will post v3 after revalidation. Sorry for the confusion.