linux-kernel - Re: while_each_thread() under rcu_read

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Message-Id: <20100621190212.C8630400C5@magilla.sf.frob.com>
Date:	Mon, 21 Jun 2010 12:02:12 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Don Zickus <dzickus@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Jerome Marchand <jmarchan@...hat.com>,
	Mandeep Singh Baines <msb@...gle.com>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: while_each_thread() under rcu_read_lock() is broken?

> Paul, Roland, do you see any problems from the correctness pov,
> or a better fix for now?
> 
> Perhaps it also makes sense to keep the old variant renamed to
> while_each_thread_locked(), I dunno.

Did we verify that only de_thread() can create the situation where a
while_each_thread-style loop without either lock can be confused?  If
that's so, then just changing it to avoid the situation seems like it
would be less invasive overall.


Thanks,
Roland
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