linux-kernel - Re: [PATCH 4/4] rcu: use gp_seq instead of rcu_gp

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Date:   Fri, 12 Jun 2020 22:10:25 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Wei Yang <richard.weiyang@...ux.alibaba.com>,
        josh@...htriplett.org, rostedt@...dmis.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        joel@...lfernandes.org, trivial@...nel.org, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] rcu: use gp_seq instead of rcu_gp_seq for consistency

On Fri, Jun 12, 2020 at 07:12:48AM -0700, Paul E. McKenney wrote:
>On Fri, Jun 12, 2020 at 10:07:55AM +0800, Wei Yang wrote:
>> Commit de30ad512a66 ("rcu: Introduce grace-period sequence numbers")
>> introduce gp_seq in rcu_state/rcu_node/rcu_data. And this field in last
>> two structure track the one in first.
>> 
>> While the comment use rcu_gp_seq which is a little misleading for
>> audience. Let's use the exact name gp_seq for consistency.
>> 
>> Signed-off-by: Wei Yang <richard.weiyang@...ux.alibaba.com>
>
>I applied and pushed the others -- good eyes, and thank you!
>
>This one does not apply.  Could you please forward-port it to
>the "dev" branch of -rcu?
>

The reason is someone has already fixed this :-)

>git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
>
>							Thanx, Paul
>
>> ---
>>  kernel/rcu/tree.h | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>> 
>> diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
>> index 512829eed545..3356842bc185 100644
>> --- a/kernel/rcu/tree.h
>> +++ b/kernel/rcu/tree.h
>> @@ -41,7 +41,7 @@ struct rcu_node {
>>  	raw_spinlock_t __private lock;	/* Root rcu_node's lock protects */
>>  					/*  some rcu_state fields as well as */
>>  					/*  following. */
>> -	unsigned long gp_seq;	/* Track rsp->rcu_gp_seq. */
>> +	unsigned long gp_seq;	/* Track rsp->gp_seq. */
>>  	unsigned long gp_seq_needed; /* Track furthest future GP request. */
>>  	unsigned long completedqs; /* All QSes done for this node. */
>>  	unsigned long qsmask;	/* CPUs or groups that need to switch in */
>> @@ -149,7 +149,7 @@ union rcu_noqs {
>>  /* Per-CPU data for read-copy update. */
>>  struct rcu_data {
>>  	/* 1) quiescent-state and grace-period handling : */
>> -	unsigned long	gp_seq;		/* Track rsp->rcu_gp_seq counter. */
>> +	unsigned long	gp_seq;		/* Track rsp->gp_seq. */
>>  	unsigned long	gp_seq_needed;	/* Track furthest future GP request. */
>>  	union rcu_noqs	cpu_no_qs;	/* No QSes yet for this CPU. */
>>  	bool		core_needs_qs;	/* Core waits for quiesc state. */
>> -- 
>> 2.20.1 (Apple Git-117)
>> 

-- 
Wei Yang
Help you, Help me