kvm_s390_gisc_unregister
extern int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc);
EXPORT_SYMBOL_GPL(kvm_s390_gisc_unregister);
kvm_s390_gisc_unregister(kvm, fib->fmt0.isc);
kvm_s390_gisc_unregister(kzdev->kvm, isc);
kvm_s390_gisc_unregister(q->matrix_mdev->kvm, q->saved_isc);
ret = kvm_s390_gisc_unregister(kvm, isc);