linux-kernel - Re: [PATCH 3/4] rcu: Use better variable names in funnel locking loop

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Message-ID: <20180524005450.GA171060@joelaf.mtv.corp.google.com>
Date:   Wed, 23 May 2018 17:54:50 -0700
From:   Joel Fernandes <joel@...lfernandes.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     Joel Fernandes <joelaf@...gle.com>, linux-kernel@...r.kernel.org,
        Boqun Feng <boqun.feng@...il.com>, byungchul.park@....com,
        Ingo Molnar <mingo@...hat.com>,
        Josh Triplett <josh@...htriplett.org>, kernel-team@...roid.com,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Peter Zilstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 3/4] rcu: Use better variable names in funnel locking loop

On Wed, May 23, 2018 at 12:23:49PM -0700, Paul E. McKenney wrote:
> On Wed, May 23, 2018 at 09:06:17AM -0700, Paul E. McKenney wrote:
> > On Tue, May 22, 2018 at 11:38:14PM -0700, Joel Fernandes wrote:
> > > From: "Joel Fernandes (Google)" <joel@...lfernandes.org>
> > > 
> > > The funnel locking loop in rcu_start_this_gp uses rcu_root as a
> > > temporary variable while walking the combining tree. This causes a
> > > tiresome exercise of a code reader reminding themselves that rcu_root
> > > may not be root. Lets just call it rnp, and rename other variables as
> > > well to be more appropriate.
> > > 
> > > Original patch: https://patchwork.kernel.org/patch/10396577/
> > > 
> > > Signed-off-by: Joel Fernandes <joel@...lfernandes.org>
> > > Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> > 
> > I used to have double Signed-off-by back when I was seconded to Linaro.
> > But I am guessing that you want the second and don't need the first
> > one.  Unless you tell me otherwise, I will remove the first one on
> > my next rebase.
> > 
> > Anyway, the new variable names are much more clear, good stuff,
> > queued for further review and testing, thank you!
> 
> And it looks to me like I should fold in the patchlet below to change to
> rnp_start in a comment.  Please let me know if this would mess things up.

Yes, missed that. Sorry. It looks great, thanks!