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Message-Id: <4C8E16770200007800015ACC@vpn.id2.novell.com>
Date: Mon, 13 Sep 2010 11:17:59 +0100
From: "Jan Beulich" <JBeulich@...ell.com>
To: <fenghua.yu@...el.com>, <khali@...ux-fr.org>
Cc: <r.marek@...embler.cz>, <mingo@...e.hu>, <tglx@...utronix.de>,
<lm-sensors@...sensors.org>, <linux-kernel@...r.kernel.org>,
<hpa@...or.com>
Subject: [PATCH] x86/hwmon: fix initialization of coretemp
Using cpuid_eax() to determine feature availability on other than
the current CPU is invalid. And feature availability should also be
checked in the hotplug code path.
Signed-off-by: Jan Beulich <jbeulich@...ell.com>
Cc: Rudolf Marek <r.marek@...embler.cz>
---
arch/x86/include/asm/cpufeature.h | 1 +
arch/x86/kernel/cpu/scattered.c | 1 +
drivers/hwmon/coretemp.c | 29 +++++++++++++----------------
3 files changed, 15 insertions(+), 16 deletions(-)
--- linux-2.6.36-rc4/arch/x86/include/asm/cpufeature.h 2010-09-13 08:44:55.000000000 +0200
+++ 2.6.36-rc4-x86-coretemp-feature-check/arch/x86/include/asm/cpufeature.h 2010-09-01 09:18:17.000000000 +0200
@@ -168,6 +168,7 @@
#define X86_FEATURE_XSAVEOPT (7*32+ 4) /* Optimized Xsave */
#define X86_FEATURE_PLN (7*32+ 5) /* Intel Power Limit Notification */
#define X86_FEATURE_PTS (7*32+ 6) /* Intel Package Thermal Status */
+#define X86_FEATURE_DTS (7*32+ 7) /* Digital Thermal Sensor */
/* Virtualization flags: Linux defined, word 8 */
#define X86_FEATURE_TPR_SHADOW (8*32+ 0) /* Intel TPR Shadow */
--- linux-2.6.36-rc4/arch/x86/kernel/cpu/scattered.c 2010-09-13 08:44:55.000000000 +0200
+++ 2.6.36-rc4-x86-coretemp-feature-check/arch/x86/kernel/cpu/scattered.c 2010-09-01 09:19:38.000000000 +0200
@@ -31,6 +31,7 @@ void __cpuinit init_scattered_cpuid_feat
const struct cpuid_bit *cb;
static const struct cpuid_bit __cpuinitconst cpuid_bits[] = {
+ { X86_FEATURE_DTS, CR_EAX, 0, 0x00000006, 0 },
{ X86_FEATURE_IDA, CR_EAX, 1, 0x00000006, 0 },
{ X86_FEATURE_ARAT, CR_EAX, 2, 0x00000006, 0 },
{ X86_FEATURE_PLN, CR_EAX, 4, 0x00000006, 0 },
--- linux-2.6.36-rc4/drivers/hwmon/coretemp.c 2010-09-13 08:45:02.000000000 +0200
+++ 2.6.36-rc4-x86-coretemp-feature-check/drivers/hwmon/coretemp.c 2010-09-03 17:54:14.000000000 +0200
@@ -423,9 +423,18 @@ static int __cpuinit coretemp_device_add
int err;
struct platform_device *pdev;
struct pdev_entry *pdev_entry;
-#ifdef CONFIG_SMP
struct cpuinfo_x86 *c = &cpu_data(cpu);
-#endif
+
+ /*
+ * 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 (!cpu_has(c, X86_FEATURE_DTS)) {
+ printk(KERN_INFO DRVNAME ": CPU (model=0x%x)"
+ " has no thermal sensor.\n", c->x86_model);
+ return 0;
+ }
mutex_lock(&pdev_list_mutex);
@@ -527,20 +536,8 @@ static int __init coretemp_init(void)
if (err)
goto exit;
- for_each_online_cpu(i) {
- struct cpuinfo_x86 *c = &cpu_data(i);
- /*
- * 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))
- coretemp_device_add(i);
- else {
- printk(KERN_INFO DRVNAME ": CPU (model=0x%x)"
- " has no thermal sensor.\n", c->x86_model);
- }
- }
+ for_each_online_cpu(i)
+ coretemp_device_add(i);
if (list_empty(&pdev_list)) {
err = -ENODEV;
goto exit_driver_unreg;
--
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