linux-kernel - [07/30] x86, mce: Thermal monitoring depends on APIC being enabled

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Date:	Wed, 20 Jan 2010 20:15:28 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: [07/30] x86, mce: Thermal monitoring depends on APIC being enabled

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Cyrill Gorcunov <gorcunov@...nvz.org>

commit 485a2e1973fd9f98c2c6776e66ac4721882b69e0 upstream.

Add check if APIC is not disabled since thermal
monitoring depends on it. As only apic gets disabled
we should not try to install "thermal monitor" vector,
print out that thermal monitoring is enabled and etc...

Note that "Intel Correct Machine Check Interrupts" already
has such a check.

Also I decided to not add cpu_has_apic check into
mcheck_intel_therm_init since even if it'll call apic_read on
disabled apic -- it's safe here and allow us to save a few code
bytes.

Reported-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
LKML-Reference: <4B25FDC2.3020401@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/kernel/cpu/mcheck/therm_throt.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -274,8 +274,9 @@ void intel_init_thermal(struct cpuinfo_x
 	int tm2 = 0;
 	u32 l, h;
 
-	/* Thermal monitoring depends on ACPI and clock modulation*/
-	if (!cpu_has(c, X86_FEATURE_ACPI) || !cpu_has(c, X86_FEATURE_ACC))
+	/* Thermal monitoring depends on APIC, ACPI and clock modulation */
+	if (!cpu_has_apic || !cpu_has(c, X86_FEATURE_ACPI) ||
+		!cpu_has(c, X86_FEATURE_ACC))
 		return;
 
 	/*


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