I can see this warnings as well and yes, kvm_arch_irq_routing_update seems to 
be available
for CONFIG_HAVE_KVM_EVENTFD=y and =n.
Seems that irqchip.c is compile independly from CONFIG_HAVE_KVM_EVENTFD,

so

Acked-by: Christian Borntraeger <borntrae...@de.ibm.com>

On 02/22/2018 01:05 PM, Sebastian Ott wrote:
> Move the kvm_arch_irq_routing_update() prototype outside of
> ifdef CONFIG_HAVE_KVM_EVENTFD guards to fix the following sparse warning:
> 
> arch/s390/kvm/../../../virt/kvm/irqchip.c:171:28: warning: symbol 
> 'kvm_arch_irq_routing_update' was not declared. Should it be static?
> 
> Signed-off-by: Sebastian Ott <seb...@linux.vnet.ibm.com>
> ---
>  include/linux/kvm_host.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index ed3d4ddbaff3..6930c63126c7 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1105,7 +1105,6 @@ static inline void kvm_irq_routing_update(struct kvm 
> *kvm)
>  {
>  }
>  #endif
> -void kvm_arch_irq_routing_update(struct kvm *kvm);
> 
>  static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
>  {
> @@ -1114,6 +1113,8 @@ static inline int kvm_ioeventfd(struct kvm *kvm, struct 
> kvm_ioeventfd *args)
> 
>  #endif /* CONFIG_HAVE_KVM_EVENTFD */
> 
> +void kvm_arch_irq_routing_update(struct kvm *kvm);
> +
>  static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
>  {
>       /*
> 

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