linux-kernel - Re: [PATCH] rcu/tree_exp: cleanup initialized but not used rdp(Internet mail)

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Message-ID: <EE593048-7443-49B6-B99E-E551AF2B7048@tencent.com>
Date:   Tue, 23 Apr 2019 08:45:33 +0000
From:   benbjiang(蒋彪) <benbjiang@...cent.com>
To:     "paulmck@...ux.ibm.com" <paulmck@...ux.ibm.com>
CC:     "josh@...htriplett.org" <josh@...htriplett.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rcu/tree_exp: cleanup initialized but not used
 rdp(Internet mail)



> 在 2019年4月23日，下午4:06，Paul E. McKenney <paulmck@...ux.ibm.com> 写道：
> 
> On Tue, Apr 23, 2019 at 09:21:55AM +0800, Jiang Biao wrote:
>> rdp is initialized but never used in synchronize_rcu_expedited(),
>> just remove it.
>> 
>> Signed-off-by: Jiang Biao <benbjiang@...cent.com>
> 
> I queued and pushed both patches for testing and review, good eyes,
> thank you!  I reworded the subject and commit logs, so could you please
> check to make sure that I didn't mess anything up?
> 
> 							Thanx, Paul
> 
Already checked, everything’s good to me. Thanks a lot.
Jiang,

>> ---
>> kernel/rcu/tree_exp.h | 2 --
>> 1 file changed, 2 deletions(-)
>> 
>> diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
>> index 4c2a0189e748..5772612379e4 100644
>> --- a/kernel/rcu/tree_exp.h
>> +++ b/kernel/rcu/tree_exp.h
>> @@ -733,7 +733,6 @@ static void sync_sched_exp_online_cleanup(int cpu)
>>  */
>> void synchronize_rcu_expedited(void)
>> {
>> -	struct rcu_data *rdp;
>> 	struct rcu_exp_work rew;
>> 	struct rcu_node *rnp;
>> 	unsigned long s;
>> @@ -770,7 +769,6 @@ void synchronize_rcu_expedited(void)
>> 	}
>> 
>> 	/* Wait for expedited grace period to complete. */
>> -	rdp = per_cpu_ptr(&rcu_data, raw_smp_processor_id());
>> 	rnp = rcu_get_root();
>> 	wait_event(rnp->exp_wq[rcu_seq_ctr(s) & 0x3],
>> 		   sync_exp_work_done(s));
>> -- 
>> 2.17.2 (Apple Git-113)
>> 
> 
>