linux-kernel - Re: while_each_thread() under rcu_read

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Message-Id: <20100709010137.B06704A968@magilla.sf.frob.com>
Date:	Thu,  8 Jul 2010 18:01:37 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Oleg Nesterov <oleg@...hat.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?

> Hmmm...  The kerneldoc for rcu_read_lock() looks like it says this
> pretty unambiguously.  Then again, that is easy for me to say, given
> that I was the one who made most of this stuff up.   ;-)

Yeah, well, I thought I knew what rcu_read_lock did and the only new thing
I had in mind was using call_rcu, so that's the only place I looked.  It
wasn't entirely unreasonable to have to read through Documentation/RCU/ a
bit for a subtlety of this kind, and I did find it quickly enough once
Oleg's attentiveness alerted me to be freshly afraid of the subtleties.

> But it has been awhile since I looked after the kerneldoc.  Please see
> below for the changes I would make if left to myself.

Those look good to me!

> Any other suggestions for improvement to the kerneldoc?

Oh, I don't know, send over someone to read it to me in a sultry voice
so I get appropriately motivated to cast about for all of it I can find
and listen closely to every word?  It already looks like if I'd actually
read all of it twice that day, I would have had the information I needed.

Thanks,
Roland
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