[PATCH] pid: Extend/Fix pid_vnr

[Serge E. Hallyn]

Quoting sukadev at us.ibm.com (sukadev at us.ibm.com):
> Oleg Nesterov [oleg at tv-sign.ru] wrote:
> | On 12/05, Eric W. Biederman wrote:
> | > 
> | > +pid_t pid_vnr(struct pid *pid)
> | > +{
> | > +	return pid_nr_ns(pid, current->nsproxy->pid_ns);
> | > +}
> 
> Hmm. current->nsproxy be NULL during process exit ?
> So this safe as long as pid_vnr() is not called after a
> process exits its namespaces. Probably no such callers atm. 

Yes I did a little audit for those this morning bc I frankly didn't
believe there weren't any.  But I couldn't find any :)

-serge

> | 
> | Excellent!!!
> | 
> | This allows us to do many cleanups. I am sending the trivial patch just
> | as example.
> | 
> | Oleg.
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