linux-kernel - Re: [PATCH v2] mm: make lru_add_drain

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Message-ID: <5202CEAA.9040204@linux.vnet.ibm.com>
Date:	Wed, 07 Aug 2013 15:48:10 -0700
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Chris Metcalf <cmetcalf@...era.com>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Tejun Heo <tj@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH v2] mm: make lru_add_drain_all() selective

On 08/06/2013 01:22 PM, Chris Metcalf wrote:
[...]

>
>   /**
> + * schedule_on_each_cpu - execute a function synchronously on each online CPU
> + * @func: the function to call
> + *
> + * schedule_on_each_cpu() executes @func on each online CPU using the
> + * system workqueue and blocks until all CPUs have completed.
> + * schedule_on_each_cpu() is very slow.
> + *
> + * RETURNS:
> + * 0 on success, -errno on failure.
> + */
> +int schedule_on_each_cpu(work_func_t func)
> +{
> +	get_online_cpus();
> +	schedule_on_cpu_mask(func, cpu_online_mask);

Looks like the return value gets lost here.

> +	put_online_cpus();
> +	return 0;
> +}
> +
> +/**
>    * flush_scheduled_work - ensure that any scheduled work has run to completion.
>    *
>    * Forces execution of the kernel-global workqueue and blocks until its

[...]

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