Subject: Re: [PATCH 17/17] net,act_police,rcu: remove rcu_barrier()

From: Lai Jiangshan <[email-masked]>
Date: Wed, 16 Mar 2011 11:13:11 +0800

On 03/15/2011 07:04 PM, Eric Dumazet wrote:
> Le mardi 15 mars 2011 à 18:11 +0800, Lai Jiangshan a écrit :
>>
>> There is no callback of this module maybe queued
>> since we use kfree_rcu(), we can safely remove the rcu_barrier().
>>
>> Signed-off-by: Lai Jiangshan <[email-masked]>
>> ---
>>  net/sched/act_police.c |    1 -
>>  1 files changed, 0 insertions(+), 1 deletions(-)
>>
>> diff --git a/net/sched/act_police.c b/net/sched/act_police.c
>> index 083b091..22e3f9b 100644
>> --- a/net/sched/act_police.c
>> +++ b/net/sched/act_police.c
>> @@ -397,7 +397,6 @@ static void __exit
>>  police_cleanup_module(void)
>>  {
>>  	tcf_unregister_action(&act_police_ops);
>> -	rcu_barrier(); /* Wait for completion of call_rcu()'s (tcf_police_free_rcu) */
>>  }
>>  
>>  module_init(police_init_module);
> 
> 
> Why is it a separate patch, and not included in patch 5/17 ?
> 

A simple_kfree_callback() a patch, if a module has multiple simple_kfree_callback()s,
"rcu_barrier()" in module_exit function should only be removed after all
callback()s are converted to kfree_rcu(). Separate patches makes things
clearer.
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