linux-kernel - Re: [PATCH 1/1] hotplug cpu: migrate a task within its cpuset

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Date:	Sat, 25 Aug 2007 13:58:56 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Cliff Wickman <cpw@....com>
Cc:	akpm@...ux-foundation.org, ego@...ibm.com, mingo@...e.hu,
	vatsa@...ibm.com, pj@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] hotplug cpu: migrate a task within its cpuset

On 08/24, Cliff Wickman wrote:
> --- linus.070821.orig/kernel/cpuset.c
> +++ linus.070821/kernel/cpuset.c
> @@ -2333,6 +2333,25 @@ cpumask_t cpuset_cpus_allowed(struct tas
>  	return mask;
>  }
>  
> +/**
> + * cpuset_cpus_allowed_lock - return cpus_allowed mask from a tasks cpuset.
> + * @tsk: pointer to task_struct from which to obtain cpuset->cpus_allowed.
> + *
> + * Description: Same as cpuset_cpus_allowed, but called with callback_mutex
> + * already held.
> + **/
> +
> +cpumask_t cpuset_cpus_allowed_lock(struct task_struct *tsk)
> +{
> +	cpumask_t mask;
> +
> +	task_lock(tsk);
> +	guarantee_online_cpus(tsk->cpuset, &mask);
> +	task_unlock(tsk);
> +
> +	return mask;
> +}

Very minor nit, perhaps it makes sense to use this function in cpuset_cpus_allowed()
to avoid the code duplication. Its name is a bit confusing, imho. How about
cpuset_cpus_allowed_locked() or __cpuset_cpus_allowed() ?

Oleg.

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