[MIPS] Define and use vi_handler_t for vectored interrupt handlers.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
index 3713d25..bb0b289 100644
--- a/include/asm-mips/system.h
+++ b/include/asm-mips/system.h
@@ -464,7 +464,10 @@
 
 extern void set_handler (unsigned long offset, void *addr, unsigned long len);
 extern void set_uncached_handler (unsigned long offset, void *addr, unsigned long len);
-extern void *set_vi_handler (int n, void *addr);
+
+typedef void (*vi_handler_t)(void);
+extern void *set_vi_handler (int n, vi_handler_t addr);
+
 extern void *set_except_vector(int n, void *addr);
 extern unsigned long ebase;
 extern void per_cpu_trap_init(void);