linux-kernel - Re: [PATCH v2 17/27] rcu: Rename rcu_dynticks_in_eqs() into rcu_watching_in

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Date: Tue, 07 May 2024 17:48:12 +0200
From: Valentin Schneider <vschneid@...hat.com>
To: Frederic Weisbecker <frederic@...nel.org>
Cc: rcu@...r.kernel.org, linux-kernel@...r.kernel.org, "Paul E. McKenney"
 <paulmck@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Neeraj
 Upadhyay <quic_neeraju@...cinc.com>, Joel Fernandes
 <joel@...lfernandes.org>, Josh Triplett <josh@...htriplett.org>, Boqun
 Feng <boqun.feng@...il.com>, Steven Rostedt <rostedt@...dmis.org>, Mathieu
 Desnoyers <mathieu.desnoyers@...icios.com>, Lai Jiangshan
 <jiangshanlai@...il.com>, Zqiang <qiang.zhang1211@...il.com>
Subject: Re: [PATCH v2 17/27] rcu: Rename rcu_dynticks_in_eqs() into
 rcu_watching_in_eqs()

On 07/05/24 15:32, Frederic Weisbecker wrote:
> Le Tue, Apr 30, 2024 at 11:17:21AM +0200, Valentin Schneider a écrit :
>> The context_tracking.state RCU_DYNTICKS subvariable has been renamed to
>> RCU_WATCHING, reflect that change in the related helpers.
>>
>> Signed-off-by: Valentin Schneider <vschneid@...hat.com>
>> ---
>>  kernel/rcu/tree.c       | 8 ++++----
>>  kernel/rcu/tree_exp.h   | 2 +-
>>  kernel/rcu/tree_stall.h | 2 +-
>>  3 files changed, 6 insertions(+), 6 deletions(-)
>>
>> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
>> index 857c2565efeac..d772755ccd564 100644
>> --- a/kernel/rcu/tree.c
>> +++ b/kernel/rcu/tree.c
>> @@ -308,9 +308,9 @@ static int rcu_watching_snap(int cpu)
>>
>>  /*
>>   * Return true if the snapshot returned from rcu_watching_snap()
>> - * indicates that RCU is in an extended quiescent state.
>> + * indicates that RCU in an extended quiescent state (not watching).
>
> *is in
>

Oh, thanks!

>>   */
>> -static bool rcu_dynticks_in_eqs(int snap)
>> +static bool rcu_watching_in_eqs(int snap)
>
> I would be tempted to propose rcu_watching_snap_in_eqs() but the
> purpose is not to dissuade people from intoning RCU code after all.
>

I've struggled with finding something sensible for the snapshot helpers; I
think I prefer your suggestion, that way we can have a common prefix for
all snapshot-related helpers. Also I keep reading rcu_watching_in_eqs() as
"is RCU watching while being in EQS?" which is nonsense.

> Reviewed-by: Frederic Weisbecker <frederic@...nel.org>