linux-kernel - Re: [PATCH -v4 03/10] futex: Cleanup variable names for futex_top

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Date:   Fri, 16 Dec 2016 16:13:10 -0800
From:   Darren Hart <dvhart@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     tglx@...utronix.de, mingo@...nel.org, juri.lelli@....com,
        rostedt@...dmis.org, xlpang@...hat.com, bigeasy@...utronix.de,
        linux-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
        jdesfossez@...icios.com, bristot@...hat.com
Subject: Re: [PATCH -v4 03/10] futex: Cleanup variable names for
 futex_top_waiter()

On Tue, Dec 13, 2016 at 09:36:41AM +0100, Peter Zijlstra wrote:
> futex_top_waiter() returns the top-waiter on the pi_mutex. Assinging
> this to a variable 'match' totally obscures the code.
> 

Yes please.

One wording nit...

> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  kernel/futex.c |   30 +++++++++++++++---------------
>  1 file changed, 15 insertions(+), 15 deletions(-)
> 
> --- a/kernel/futex.c
> +++ b/kernel/futex.c

> @@ -1317,11 +1317,11 @@ static int wake_futex_pi(u32 __user *uad
>  
>  	/*
>  	 * It is possible that the next waiter (the one that brought
> -	 * this owner to the kernel) timed out and is no longer
> +	 * top_waiter owner to the kernel) timed out and is no longer
>  	 * waiting on the lock.
>  	 */

This breaks my parser (and did before too).

Consider:

/*
 * It is possible that the next waiter (that caused top_waiter to call
 * into the kernel) has since timed out and is no longer waiting on the
 * lock.
 */

Is that clearer?

-- 
Darren Hart
Intel Open Source Technology Center