linux-kernel - Re: [PATCH] kthread: Export kthread functions

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Date:	Mon, 27 Jul 2015 17:45:50 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	David Kershner <david.kershner@...sys.com>
Cc:	akpm@...ux-foundation.org, tj@...nel.org, laijs@...fujitsu.com,
	nacc@...ux.vnet.ibm.com, nhorman@...hat.com, tglx@...utronix.de,
	mingo@...hat.com, linux-kernel@...r.kernel.org,
	jes.sorensen@...hat.com, sparmaintainer@...sys.com
Subject: Re: [PATCH] kthread: Export kthread functions


* David Kershner <david.kershner@...sys.com> wrote:

> The s-Par visornic driver, currently in staging, processes a queue
> being serviced by the an s-Par service partition. We can get a message
> that something has happened with the Service Partition, when that
> happens, we must not access the channel until we get a message that the
> service partition is back again.
> 
> The visornic driver has a thread for processing the channel, when we
> get the message, we need to be able to park the thread and then resume
> it when the problem clears.
> 
> We can do this with kthread_park and unpark but they are not exported
> from the kernel, this patch exports the needed functions.
> 
> Signed-off-by: David Kershner <david.kershner@...sys.com>
> ---
>  kernel/kthread.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/kernel/kthread.c b/kernel/kthread.c
> index 10e489c..bad80c1 100644
> --- a/kernel/kthread.c
> +++ b/kernel/kthread.c
> @@ -97,6 +97,7 @@ bool kthread_should_park(void)
>  {
>  	return test_bit(KTHREAD_SHOULD_PARK, &to_kthread(current)->flags);
>  }
> +EXPORT_SYMBOL(kthread_should_park);
>  
>  /**
>   * kthread_freezable_should_stop - should this freezable kthread return now?
> @@ -171,6 +172,7 @@ void kthread_parkme(void)
>  {
>  	__kthread_parkme(to_kthread(current));
>  }
> +EXPORT_SYMBOL(kthread_parkme);
>  
>  static int kthread(void *_create)
>  {
> @@ -411,6 +413,7 @@ void kthread_unpark(struct task_struct *k)
>  	if (kthread)
>  		__kthread_unpark(k, kthread);
>  }
> +EXPORT_SYMBOL(kthread_unpark);
>  
>  /**
>   * kthread_park - park a thread created by kthread_create().
> @@ -441,6 +444,7 @@ int kthread_park(struct task_struct *k)
>  	}
>  	return ret;
>  }
> +EXPORT_SYMBOL(kthread_park);
>  
>  /**
>   * kthread_stop - stop a thread created by kthread_create().

Please make these EXPORT_SYMBOL_GPL(), as kthread_freezable_should_stop() is 
already _GPL(), and generally new kthread APIs are exported via 
EXPORT_SYMBOL_GPL().

With that change:

  Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo
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