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

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Date:	Wed, 16 Jul 2014 21:01:52 -0400
From:	Pranith Kumar <bobby.prani@...il.com>
To:	Lai Jiangshan <laijs@...fujitsu.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 07/16/2014 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)

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>
---
 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);
-- 
1.9.1

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