sparc: Don't leave sparc_pmu_type NULL on sun4v.

Otherwise we'll crash in the sparc perf init code.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/cpu.c b/arch/sparc/kernel/cpu.c
index 138dbbc..70f035c 100644
--- a/arch/sparc/kernel/cpu.c
+++ b/arch/sparc/kernel/cpu.c
@@ -479,6 +479,7 @@
 		       prom_cpu_compatible);
 		sparc_cpu_type = "Unknown SUN4V CPU";
 		sparc_fpu_type = "Unknown SUN4V FPU";
+		sparc_pmu_type = "Unknown SUN4V PMU";
 		break;
 	}
 }