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Diffstat (limited to 'arch/s390/kernel/irq.c')
-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 2429ecd..1c2cdd5 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -255,3 +255,26 @@ void service_subclass_irq_unregister(void)
spin_unlock(&sc_irq_lock);
}
EXPORT_SYMBOL(service_subclass_irq_unregister);
+
+static DEFINE_SPINLOCK(ma_subclass_lock);
+static int ma_subclass_refcount;
+
+void measurement_alert_subclass_register(void)
+{
+ spin_lock(&ma_subclass_lock);
+ if (!ma_subclass_refcount)
+ ctl_set_bit(0, 5);
+ ma_subclass_refcount++;
+ spin_unlock(&ma_subclass_lock);
+}
+EXPORT_SYMBOL(measurement_alert_subclass_register);
+
+void measurement_alert_subclass_unregister(void)
+{
+ spin_lock(&ma_subclass_lock);
+ ma_subclass_refcount--;
+ if (!ma_subclass_refcount)
+ ctl_clear_bit(0, 5);
+ spin_unlock(&ma_subclass_lock);
+}
+EXPORT_SYMBOL(measurement_alert_subclass_unregister);