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Subject[PATCH 1/2] Detect the thermal sensors by CPUID
The thermal sensors of Intel(R) CPUs can be detected by CPUID instruction,
indicated by CPUID.06H.EAX[0].

CC: Andrew Morton <akpm@linux-foundation.org>
CC: Jean Delvare <khali@linux-fr.org>
CC: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Huaxu Wan <huaxu.wan@linux.intel.com>
Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Reviewed-By: Valdis Kletnieks <valdis.kletnieks@vt.edu>

---
drivers/hwmon/coretemp.c | 34 +++++++++++++---------------------
1 file changed, 13 insertions(+), 21 deletions(-)
Index: head/drivers/hwmon/coretemp.c
===================================================================
--- head.orig/drivers/hwmon/coretemp.c
+++ head/drivers/hwmon/coretemp.c
@@ -451,28 +451,20 @@ static int __init coretemp_init(void)

for_each_online_cpu(i) {
struct cpuinfo_x86 *c = &cpu_data(i);
-
- /* check if family 6, models 0xe (Pentium M DC),
- 0xf (Core 2 DC 65nm), 0x16 (Core 2 SC 65nm),
- 0x17 (Penryn 45nm), 0x1a (Nehalem), 0x1c (Atom),
- 0x1e (Lynnfield) */
- if ((c->cpuid_level < 0) || (c->x86 != 0x6) ||
- !((c->x86_model == 0xe) || (c->x86_model == 0xf) ||
- (c->x86_model == 0x16) || (c->x86_model == 0x17) ||
- (c->x86_model == 0x1a) || (c->x86_model == 0x1c) ||
- (c->x86_model == 0x1e))) {
-
- /* supported CPU not found, but report the unknown
- family 6 CPU */
- if ((c->x86 == 0x6) && (c->x86_model > 0xf))
- printk(KERN_WARNING DRVNAME ": Unknown CPU "
- "model 0x%x\n", c->x86_model);
- continue;
+ /*
+ * CPUID.06H.EAX[0] indicates whether the CPU has thermal
+ * sensors. We check this bit only, all the early CPUs
+ * without thermal sensors will be filtered out.
+ */
+ if (c->cpuid_level >= 6 && (cpuid_eax(0x06) & 0x01)) {
+ err = coretemp_device_add(i);
+ if (err)
+ goto exit_devices_unreg;
+
+ } else {
+ printk(KERN_INFO DRVNAME ": CPU (model=0x%x)"
+ " has no thermal sensor.\n", c->x86_model);
}
-
- err = coretemp_device_add(i);
- if (err)
- goto exit_devices_unreg;
}
if (list_empty(&pdev_list)) {
err = -ENODEV;


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