linux-kernel - Re: [PATCH 2/3] rcu: Remove stale comment in tree.c

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Date:	Thu, 17 Jul 2014 09:25:17 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Pranith Kumar <bobby.prani@...il.com>
CC:	<paulmck@...ux.vnet.ibm.com>, <josh@...htriplett.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"open list:READ-COPY UPDATE..." <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] rcu: Remove stale comment in tree.c

On 07/17/2014 09:01 AM, Pranith Kumar wrote:
> On 07/16/2014 08:55 PM, Lai Jiangshan wrote:
>> On 07/16/2014 09:29 PM, Pranith Kumar wrote:
>>> On 07/16/2014 08:47 AM, Paul E. McKenney wrote:
>>>> On Tue, Jul 15, 2014 at 06:57:59PM -0400, Pranith Kumar wrote:
>>>>>
>>>>> On 07/15/2014 06:53 PM, josh@...htriplett.org wrote:
>>>>>> On Tue, Jul 15, 2014 at 06:31:48PM -0400, Pranith Kumar wrote:
>>>>>>> This commit removes a stale comment in rcu/tree.c.
>>>>>>> FYI, an updated comment exists a few lines below this.
>>>>>>>
>>>>>>> Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
>>>>>> In general, when removing a stale comment, I'd suggest explaining why
>>>>>> the comment is stale.  Was code removed without removing the
>>>>>> corresponding comment, or was code changed such that the comment no
>>>>>> longer applies, or...?
>>>>>
>>>>> I guess it was left out when code was moved around previously. And I did mention that an updated comment is there a few lines below.
>>>>>
>>>>> For reference this is the new comment which is below the old comment, they mean the same :)
>>>>>
>>>>>     /* Remove the outgoing CPU from the masks in the rcu_node hierarchy. */
>>>>
>>>> Indeed that is the case.
>>>>
>>>> Please update the commit log with this explanation and resend.
>>>>
>>>> 								Thanx, Paul
>>>>
>>>
>>> Please find the updated patch below.
>>>
>>> --
>>> Pranith
>>>
>>> From: Pranith Kumar <bobby.prani@...il.com>
>>> Date: Mon, 14 Jul 2014 16:01:05 -0400
>>> Subject: [PATCH 2/3] rcu: Remove stale comment in tree.c
>>>
>>> This commit removes a stale comment in rcu/tree.c which was left out when some
>>> code was moved around previously.
>>
>> Which commit caused this leftover comment? Could you mention that commit in
>> your changlog?
>>
>> 12BitsCmmtID ("commit title...")
>>
> 
> Sure, please find an updated patch with Josh Triplett's sign-off added:
> 
> From: Pranith Kumar <bobby.prani@...il.com>
> Date: Mon, 14 Jul 2014 16:01:05 -0400
> Subject: [PATCH 2/3] rcu: Remove stale comment in tree.c
> 
> 
> This commit removes a stale comment in rcu/tree.c which was left out in
> commit 2036d94a7b61ca5032ce (rcu:  Rework detection of use of RCU by offline CPUs)

I suggest you use the following syntax in future.

2036d94a7b61 ("rcu:  Rework detection of use of RCU by offline CPUs")

> 
> For reference, the following updated comment exists a few lines below this which
> means the same.
> 
> /* Remove the outgoing CPU from the masks in the rcu_node hierarchy. */
> 
> Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
> Reviewed-by: Joe Tripplett <josh@...htriplett.org>

Reviewed-by: Lai Jiangshan <laijs@...fujitsu.com>

> ---
>  kernel/rcu/tree.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index a1abaa8..e67246e 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -2211,8 +2211,6 @@ static void rcu_cleanup_dead_cpu(int cpu, struct rcu_state *rsp)
>  	/* Adjust any no-longer-needed kthreads. */
>  	rcu_boost_kthread_setaffinity(rnp, -1);
>  
> -	/* Remove the dead CPU from the bitmasks in the rcu_node hierarchy. */
> -
>  	/* Exclude any attempts to start a new grace period. */
>  	mutex_lock(&rsp->onoff_mutex);
>  	raw_spin_lock_irqsave(&rsp->orphan_lock, flags);

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