linux-kernel - Re: [PATCH] sched: Do not zero sg->cpumask and sg->sgp->power in build_sched

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Date:	Tue, 13 May 2014 09:32:53 +0100
From:	Dietmar Eggemann <dietmar.eggemann@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: Do not zero sg->cpumask and sg->sgp->power in
 build_sched_groups

Hi Peter,

On 30/04/14 14:39, Dietmar Eggemann wrote:
> From: Dietmar Eggemann <Dietmar.Eggemann@....com>
> 
> There is no need to zero struct sched_group member cpumask and struct
> sched_group_power member power since both structures are already allocated
> as zeroed memory in __sdt_alloc().
> 
> This patch has been tested with
> BUG_ON(!cpumask_empty(sched_group_cpus(sg))); and BUG_ON(sg->sgp->power);
> in build_sched_groups() on ARM TC2 and INTEL i5 M520 platform including
> CPU hotplug scenarios.
> 
> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
> ---
>  kernel/sched/core.c |    2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 9cae286824bb..6bc51aebbf1b 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -5807,8 +5807,6 @@ build_sched_groups(struct sched_domain *sd, int cpu)
>  			continue;
>  
>  		group = get_group(i, sdd, &sg);
> -		cpumask_clear(sched_group_cpus(sg));
> -		sg->sgp->power = 0;
>  		cpumask_setall(sched_group_mask(sg));
>  
>  		for_each_cpu(j, span) {
> 

I think this one slipped through the cracks. Could you have a look?

Thanks,

-- Dietmar

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