linux-kernel - Re: [PATCH tip/core/rcu 1/6] rcu: Update documentation to cover call_srcu() and srcu

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Message-ID: <20120615201911.GA31184@leaf>
Date:	Fri, 15 Jun 2012 13:19:12 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 1/6] rcu: Update documentation to cover
 call_srcu() and srcu_barrier().

On Fri, Jun 15, 2012 at 11:57:49AM -0700, Paul E. McKenney wrote:
> --- a/Documentation/RCU/rcubarrier.txt
> +++ b/Documentation/RCU/rcubarrier.txt
> @@ -261,8 +261,10 @@ Answers to Quick Quizzes
>  
>  Quick Quiz #1: Why is there no srcu_barrier()?
>  
> -Answer: Since there is no call_srcu(), there can be no outstanding SRCU
> -	callbacks. Therefore, there is no need to wait for them.
> +Answer: There really is an srcu_barrier() now that there is a call_srcu().
> +	Before call_srcu(), there were no SRCU callbacks, and there was
> +	therefore no need to wait for them, and therefore there was
> +	no srcu_barrier().

I don't think it makes sense to leave this question in its current form
and just change the answer.  It seems like a trick question now. :)

I'd suggest just dropping the question and renumbering the remaining
questions.

- Josh Triplett
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