Date: Mon, 27 Jul 2015 11:49:02 -0400
From: Neil Horman <nhorman@redhat.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: David Kershner <david.kershner@unisys.com>, akpm@linux-foundation.org,
        tj@kernel.org, laijs@cn.fujitsu.com, nacc@linux.vnet.ibm.com,
        tglx@linutronix.de, mingo@redhat.com, linux-kernel@vger.kernel.org,
        jes.sorensen@redhat.com, sparmaintainer@unisys.com
Subject: Re: [PATCH] kthread: Export kthread functions
Message-ID: <20150727154902.GG6497@hmsreliant.think-freely.org>
References: <1437777920-31156-1-git-send-email-david.kershner@unisys.com>
 <20150727154549.GA18807@gmail.com>
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On Mon, Jul 27, 2015 at 05:45:50PM +0200, Ingo Molnar wrote:
> 
> * David Kershner <david.kershner@unisys.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@unisys.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().
> 
Im ok with that.  David?
Neil

> With that change:
> 
>   Acked-by: Ingo Molnar <mingo@kernel.org>
> 
> Thanks,
> 
> 	Ingo
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