linux-kernel - Re: [PATCH v2 6/6] sched: Annotate perf_domain pointer with _

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Message-Id: <20190225211250.GA4072@linux.ibm.com>
Date:   Mon, 25 Feb 2019 13:12:50 -0800
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Christian Brauner <christian@...uner.io>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Ahern <dsahern@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Ingo Molnar <mingo@...hat.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Josh Triplett <josh@...htriplett.org>, keescook@...omium.org,
        kernel-hardening@...ts.openwall.com, kernel-team@...roid.com,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        netdev@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Quentin Perret <quentin.perret@....com>, rcu@...r.kernel.org,
        Song Liu <songliubraving@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        xdp-newbies@...r.kernel.org, Yonghong Song <yhs@...com>
Subject: Re: [PATCH v2 6/6] sched: Annotate perf_domain pointer with __rcu

On Sat, Feb 23, 2019 at 01:34:34AM -0500, Joel Fernandes (Google) wrote:
> This fixes the following sparse errors in sched/fair.c:
> 
> fair.c:6506:14: error: incompatible types in comparison expression
> fair.c:8642:21: error: incompatible types in comparison expression
> 
> Using __rcu will also help sparse catch any future bugs.
> 
> Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>

>From an RCU perspective:

Reviewed-by: Paul E. McKenney <paulmck@...ux.ibm.com>

> ---
>  kernel/sched/sched.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index ca6a79f57e7a..c8e6514433a9 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -780,7 +780,7 @@ struct root_domain {
>  	 * NULL-terminated list of performance domains intersecting with the
>  	 * CPUs of the rd. Protected by RCU.
>  	 */
> -	struct perf_domain	*pd;
> +	struct perf_domain __rcu *pd;
>  };
>  
>  extern struct root_domain def_root_domain;
> -- 
> 2.21.0.rc0.258.g878e2cd30e-goog
>