x86/kvm: Fix -Wmissing-prototypes warnings
We get two warning when build kernel with W=1: arch/x86/kernel/kvm.c:872:6: warning: no previous prototype for ‘arch_haltpoll_enable’ [-Wmissing-prototypes] arch/x86/kernel/kvm.c:885:6: warning: no previous prototype for ‘arch_haltpoll_disable’ [-Wmissing-prototypes] Including the missing head file can fix this. Signed-off-by: Yi Wang <wang.yi59@zte.com.cn> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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