linux-kernel - Re: [PATCH RFC] rcu/segcblist: Add counters to segcblist datastructure

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Message-ID: <20200720142923.mrudcweyttlmnhqp@linux-p48b>
Date:   Mon, 20 Jul 2020 07:29:23 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org, Joel Fernandes <joelaf@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Josh Triplett <josh@...htriplett.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Marco Elver <elver@...gle.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Paul E. McKenney" <paulmck@...nel.org>, rcu@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>
Subject: Re: [PATCH RFC] rcu/segcblist: Add counters to segcblist
 datastructure

On Sat, 18 Jul 2020, Joel Fernandes (Google) wrote:

>+/* Move from's segment length to to's segment. */
>+static void rcu_segcblist_move_seglen(struct rcu_segcblist *rsclp, int from, int to)
>+{
>+	long len = rcu_segcblist_get_seglen(rsclp, from);
>+
>+	if (!len || from == to)
>+		return;

Nit: You probably wanna do the parameter sanity checks before the
atomic_read.

Thanks,
Davidlohr