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-rw-r--r--arch/s390/kernel/irq.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 2429ecd68872..1c2cdd59ccd0 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -255,3 +255,26 @@ void service_subclass_irq_unregister(void)
255 spin_unlock(&sc_irq_lock); 255 spin_unlock(&sc_irq_lock);
256} 256}
257EXPORT_SYMBOL(service_subclass_irq_unregister); 257EXPORT_SYMBOL(service_subclass_irq_unregister);
258
259static DEFINE_SPINLOCK(ma_subclass_lock);
260static int ma_subclass_refcount;
261
262void measurement_alert_subclass_register(void)
263{
264 spin_lock(&ma_subclass_lock);
265 if (!ma_subclass_refcount)
266 ctl_set_bit(0, 5);
267 ma_subclass_refcount++;
268 spin_unlock(&ma_subclass_lock);
269}
270EXPORT_SYMBOL(measurement_alert_subclass_register);
271
272void measurement_alert_subclass_unregister(void)
273{
274 spin_lock(&ma_subclass_lock);
275 ma_subclass_refcount--;
276 if (!ma_subclass_refcount)
277 ctl_clear_bit(0, 5);
278 spin_unlock(&ma_subclass_lock);
279}
280EXPORT_SYMBOL(measurement_alert_subclass_unregister);