[PATCH 0/2] 26c4caea "don't allow duplicate entries in listenermode" fix

[Oleg Nesterov]

Hello.

I noticed 26c4caea by accident. Afaics it deserves a couple
of minor fixes/cleanups.

COMPILE TESTED ONLY. Needs review and acks ;)

Can't we kill listener->valid? It seems we can set ->pid = 0
to mark it invalid.

Oleg.

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