linux-kernel - Re: Fwd: [RFC] make kthread_worker

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Message-ID: <20150603052013.GA20091@mtj.duckdns.org>
Date:	Wed, 3 Jun 2015 14:20:13 +0900
From:	Tejun Heo <tj@...nel.org>
To:	yalin wang <yalin.wang2010@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, laijs@...fujitsu.com,
	nacc@...ux.vnet.ibm.com, penguin-kernel@...ove.sakura.ne.jp,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Fwd: [RFC] make kthread_worker_fn to be freezable

On Tue, Jun 02, 2015 at 11:13:44AM +0800, yalin wang wrote:
> this means i need create kthread like this :
> 
> struct task_struct *kworker_task = kthread_run(kthread_worker_fn,
> &worker, "nvme%d", dev->instance);
> kworker_task->flags &= ~PF_NOFREEZE;
> is it safe to do like this ?

It's not.

> i don't see an API to set other thread to be freezable .
> only set_freezable() , which set the current thread to be freezable .

But you can create a wrapper kthread function which sets freezable and
calls kthread_worker_fn().

Thanks.

-- 
tejun
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