linux-kernel - Re: [PATCH v3 3/3] rcu: Use _full() API to debug synchronize

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Message-ID: <Z73wOEBv9z4EtT56@pc636>
Date: Tue, 25 Feb 2025 17:30:48 +0100
From: Uladzislau Rezki <urezki@...il.com>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: "Uladzislau Rezki (Sony)" <urezki@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, RCU <rcu@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Cheung Wall <zzqq0103.hey@...il.com>,
	Neeraj upadhyay <Neeraj.Upadhyay@....com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: Re: [PATCH v3 3/3] rcu: Use _full() API to debug synchronize_rcu()

On Tue, Feb 25, 2025 at 07:48:55AM -0800, Paul E. McKenney wrote:
> On Tue, Feb 25, 2025 at 12:00:20PM +0100, Uladzislau Rezki (Sony) wrote:
> > Switch for using of get_state_synchronize_rcu_full() and
> > poll_state_synchronize_rcu_full() pair for debug a normal
> > synchronize_rcu() call.
> > 
> > Just using "not" full APIs to identify if a grace period
> > is passed or not might lead to a false kernel splat.
> > 
> > Link: https://lore.kernel.org/lkml/Z5ikQeVmVdsWQrdD@pc636/T/
> > Fixes: 988f569ae041 ("rcu: Reduce synchronize_rcu() latency")
> > Reported-by: cheung wall <zzqq0103.hey@...il.com>
> > Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> 
> This one passes light testing, so:
> 
> Reviewed-by: Paul E. McKenney <paulmck@...nel.org>
> 
Thank you!

--
Uladzislau Rezki