linux-kernel - Re: [PATCH tip/core/rcu 2/3] rcu: Provide polling interfaces for Tiny RCU grace periods

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Message-ID: <20210323164548.GZ2696@paulmck-ThinkPad-P72>
Date:   Tue, 23 Mar 2021 09:45:48 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, mingo@...nel.org, jiangshanlai@...il.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org
Subject: Re: [PATCH tip/core/rcu 2/3] rcu: Provide polling interfaces for
 Tiny RCU grace periods

On Tue, Mar 23, 2021 at 03:02:07PM +0100, Frederic Weisbecker wrote:
> On Mon, Mar 22, 2021 at 12:45:22PM -0700, Paul E. McKenney wrote:
> > On Mon, Mar 22, 2021 at 08:00:35PM +0100, Frederic Weisbecker wrote:
> > > But poll_state_synchronize_rcu() checks that the gp_num has changed,
> > > which is not needed for cond_synchronize_rcu() since this it is
> > > only allowed to be called from a QS.
> > 
> > Good catch, and thank you!  Back to a single might_sleep() it is!
> 
> And then: Reviewed-by: Frederic Weisbecker <frederic@...nel.org>

Thank you!  I will apply this on my next rebase.

							Thanx, Paul