linux-kernel - [09/18] x86, apic: Enable lapic nmi watchdog on AMD Family 11h

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Date:	Wed, 16 Dec 2009 16:46:00 -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,
	Mikael Pettersson <mikpe@...uu.se>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Joerg Roedel <joerg.roedel@....com>,
	Ingo Molnar <mingo@...e.hu>
Subject: [09/18] x86, apic: Enable lapic nmi watchdog on AMD Family 11h

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

------------------
From: Mikael Pettersson <mikpe@...uu.se>

commit 7d1849aff6687a135a8da3a75e32a00e3137a5e2 upstream.

The x86 lapic nmi watchdog does not recognize AMD Family 11h,
resulting in:

  NMI watchdog: CPU not supported

As far as I can see from available documentation (the BKDM),
family 11h looks identical to family 10h as far as the PMU
is concerned.

Extending the check to accept family 11h results in:

  Testing NMI watchdog ... OK.

I've been running with this change on a Turion X2 Ultra ZM-82
laptop for a couple of weeks now without problems.

Signed-off-by: Mikael Pettersson <mikpe@...uu.se>
Cc: Andreas Herrmann <andreas.herrmann3@....com>
Cc: Joerg Roedel <joerg.roedel@....com>
LKML-Reference: <19223.53436.931768.278021@...spetsen.it.uu.se>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/kernel/cpu/perfctr-watchdog.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/cpu/perfctr-watchdog.c
+++ b/arch/x86/kernel/cpu/perfctr-watchdog.c
@@ -646,7 +646,7 @@ static void probe_nmi_watchdog(void)
 	switch (boot_cpu_data.x86_vendor) {
 	case X86_VENDOR_AMD:
 		if (boot_cpu_data.x86 != 6 && boot_cpu_data.x86 != 15 &&
-		    boot_cpu_data.x86 != 16)
+		    boot_cpu_data.x86 != 16 && boot_cpu_data.x86 != 17)
 			return;
 		wd_ops = &k7_wd_ops;
 		break;


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