Re: [PATCH v2 6/6] sched: Annotate perf_domain pointer with __rcu

[Paul E. McKenney]

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@xxxxxxxxxxxxxxxxx>

>From an RCU perspective:

Reviewed-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>

> ---
>  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
>