arch/i386/xen/events.c should #include <asm/xen/hypervisor.h>

Every file should include the headers containing the prototypes for
its global functions.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/i386/xen/events.c

@@ -31,6 +31,7 @@
 #include <asm/irq.h>
 #include <asm/sync_bitops.h>
 #include <asm/xen/hypercall.h>
+#include <asm/xen/hypervisor.h>
 
 #include <xen/events.h>
 #include <xen/interface/xen.h>