linux-kernel - Re: [PATCH v2 11/12] cpuset: allow writing offlined masks to cpuset.cpus/mems

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Date:	Tue, 15 Oct 2013 11:36:01 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH v2 11/12] cpuset: allow writing offlined masks to
 cpuset.cpus/mems

On Fri, Oct 11, 2013 at 05:51:54PM +0800, Li Zefan wrote:
> As the configured masks won't be limited by its parent, and the top
> cpuset's masks won't change when hotplug happens, it's natural to
> allow writing offlined masks to the configured masks.
> 
> Signed-off-by; Li Zefan <lizefan@...wei.com>
> ---
>  kernel/cpuset.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/cpuset.c b/kernel/cpuset.c
> index e71c04f..a98723d 100644
> --- a/kernel/cpuset.c
> +++ b/kernel/cpuset.c
> @@ -960,7 +960,8 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
>  		if (retval < 0)
>  			return retval;
>  
> -		if (!cpumask_subset(trialcs->cpus_allowed, cpu_active_mask))
> +		if (!cpumask_subset(trialcs->cpus_allowed,
> +				    top_cpuset.cpus_allowed))

Shouldn't this gated by sane_behavior?

>  
> @@ -1238,8 +1239,8 @@ static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
>  			goto done;
>  
>  		if (!nodes_subset(trialcs->mems_allowed,
> -				node_states[N_MEMORY])) {
> -			retval =  -EINVAL;
> +				  top_cpuset.mems_allowed)) {
> +			retval = -EINVAL;

Ditto.

Thanks.

-- 
tejun
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