MFC r1.6

Don't attach to non Core CPUs. This is needed because on the PIII,
 querying the number of sensors returns > 0.

PR:             120541
Approved by:    njl (mentor)

sys/dev/coretemp/coretemp.c

@@ -143,6 +143,15 @@ coretemp_attach(device_t dev)
 	cpu_model += ((cpu_id >> 16) & 0xf) << 4;
 	cpu_mask = cpu_id & 15;
 
+	/*
+	 * Some CPUs, namely the PIII, don't have thermal sensors, but
+	 * report them when the CPUID check is performed in
+	 * coretemp_identify(). This leads to a later GPF when the sensor
+	 * is queried via a MSR, so we stop here.
+	 */
+	if (cpu_model < 0xe)
+		return (ENXIO);
+	    
 	/*
 	 * Check for errata AE18.
 	 * "Processor Digital Thermal Sensor (DTS) Readout stops