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We get a warning when build kernel W=1: arch/x86/kvm/../../../virt/kvm/eventfd.c:48:1: warning: no previous prototype for ‘kvm_arch_irqfd_allowed’ [-Wmissing-prototypes] kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args) ^ The reason is kvm_arch_irqfd_allowed() is declared in arch/x86/kvm/irq.h, which is not included by eventfd.c. Considering kvm_arch_irqfd_allowed() is a weakly defined function in eventfd.c, remove the declaration to kvm_host.h can fix this. Signed-off-by: Yi Wang <wang.yi59@zte.com.cn> Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>