On Mon, Jul 27, 2015 at 05:45:50PM +0200, Ingo Molnar wrote: > > * David Kershner <david.kersh...@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.kersh...@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 <mi...@kernel.org> > > Thanks, > > Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/