[PATCH v2 04/12] KVM: s390: factor out nullify_gisa()

[Michael Mueller <mimu@xxxxxxxxxxxxx>]

This function will be used by the GIB alert handler and during
the GISA clear operation. Thus it gets factored out here.

Signed-off-by: Michael Mueller <mimu@xxxxxxxxxxxxx>
Reviewed-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
---
 arch/s390/kvm/interrupt.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 2149059e9e17..56d431508435 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -2882,11 +2882,16 @@ int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
 	return n;
 }
 
+static void nullify_gisa(struct kvm_s390_gisa *gisa)
+{
+	memset(gisa, 0, sizeof(struct kvm_s390_gisa));
+	gisa->next_alert = (u32)(u64)gisa;
+}
+
 void kvm_s390_gisa_clear(struct kvm *kvm)
 {
 	if (kvm->arch.gisa) {
-		memset(kvm->arch.gisa, 0, sizeof(struct kvm_s390_gisa));
-		kvm->arch.gisa->next_alert = (u32)(u64)kvm->arch.gisa;
+		nullify_gisa(kvm->arch.gisa);
 		VM_EVENT(kvm, 3, "gisa 0x%pK cleared", kvm->arch.gisa);
 	}
 }
-- 
2.13.4