KVM: s390: use atomic bitops to access pending_irqs bitmap

Currently we use a mixture of atomic/non-atomic bitops
and the local_int spin lock to protect the pending_irqs bitmap
and interrupt payload data.

We need to use atomic bitops for the pending_irqs bitmap everywhere
and in addition acquire the local_int lock where interrupt data needs
to be protected.

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

arch/s390/kvm/interrupt.c

@@ -929,7 +929,7 @@ static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 
 	li->irq.pgm = irq->u.pgm;
-	__set_bit(IRQ_PEND_PROG, &li->pending_irqs);
+	set_bit(IRQ_PEND_PROG, &li->pending_irqs);
 	return 0;
 }
 
@@ -995,7 +995,7 @@ int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
 				   irq->u.extcall.code, 0, 2);
 
 	*extcall = irq->u.extcall;
-	__set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
+	set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 	return 0;
 }