diff options
Diffstat (limited to 'arch/s390/kernel/irq.c')
-rw-r--r-- | arch/s390/kernel/irq.c | 23 |
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 | } |
257 | EXPORT_SYMBOL(service_subclass_irq_unregister); | 257 | EXPORT_SYMBOL(service_subclass_irq_unregister); |
258 | |||
259 | static DEFINE_SPINLOCK(ma_subclass_lock); | ||
260 | static int ma_subclass_refcount; | ||
261 | |||
262 | void 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 | } | ||
270 | EXPORT_SYMBOL(measurement_alert_subclass_register); | ||
271 | |||
272 | void 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 | } | ||
280 | EXPORT_SYMBOL(measurement_alert_subclass_unregister); | ||