The thermal sensors of Intel CPUs can be detected by CPUID instruction,
indicated by CPUID.06H.EAX[0].
Signed-off-by: Huaxu Wan <huaxu.wan@xxxxxxxxx>
---
drivers/hwmon/coretemp.c | 24 +++++++-----------------
1 files changed, 7 insertions(+), 17 deletions(-)
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 2d7bcee..55122d8 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -440,6 +440,7 @@ static int __init coretemp_init(void)
{
int i, err = -ENODEV;
struct pdev_entry *p, *n;
+ u32 eax;
/* quick check if we run Intel */
if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL)
@@ -450,23 +451,12 @@ static int __init coretemp_init(void)
goto exit;
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 %x\n", c->x86_model);
+ /* check if the CPU has thermal sensor */
+ eax = cpuid_eax(0x06);
+ if (!(eax & 0x01)) {
+ struct cpuinfo_x86 *c = &cpu_data(i);
+ printk_once(KERN_WARNING DRVNAME ": CPU (model=0x%x)"
+ " has no thermal sensor!\n", c->x86_model);
continue;
}
--
1.6.3.3.363.g725cf7
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