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

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Date:   Thu, 9 Sep 2021 14:53:34 +0100
From:   Will Deacon <will@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     tglx@...utronix.de, boqun.feng@...il.com,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        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 12:59:17PM +0200, 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();
>  			__rwbase_write_unlock(rwb, 0, flags);
>  			return -EINTR;

Acked-by: Will Deacon <will@...nel.org>

Will