linux-kernel - Re: [PATCH 2/4] locking/rwbase: Properly match set_and_save_state() to restore

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Message-ID: <87mtofehps.ffs@tglx>
Date:   Tue, 14 Sep 2021 09:31:27 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>, boqun.feng@...il.com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        Ingo Molnar <mingo@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Mike Galbraith <efault@....de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: Re: [PATCH 2/4] locking/rwbase: Properly match set_and_save_state()
 to restore_state()

On Thu, Sep 09 2021 at 12:59, Peter Zijlstra wrote:
> Noticed while looking at the readers race.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  kernel/locking/rwbase_rt.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- a/kernel/locking/rwbase_rt.c
> +++ b/kernel/locking/rwbase_rt.c
> @@ -220,7 +220,7 @@ static int __sched rwbase_write_lock(str
>  	for (; atomic_read(&rwb->readers);) {
>  		/* Optimized out for rwlocks */
>  		if (rwbase_signal_pending_state(state, current)) {
> -			__set_current_state(TASK_RUNNING);
> +			rwbase_restore_current_state();

Right, that's functionally equivalent and makes the code more consistent.

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>