From 4d2be1267fcfb3a4d2198fd696aec5e3dcbce60e Mon Sep 17 00:00:00 2001
From: Jaswinder Singh Rajput <jaswinder@kernel.org>
Date: Thu, 11 Jun 2009 15:28:09 +0530
Subject: [PATCH] perf_counter, x86: Check old-AMD performance monitoring
 support

AMD supports performance monitoring start from K7 (i.e. family 6),
so disable it for earlier AMD CPUs.

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1244714289.6923.0.camel@ht.satnam>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/kernel/cpu/perf_counter.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 275bc14..3c37c39 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -1459,6 +1459,10 @@ static int intel_pmu_init(void)
 
 static int amd_pmu_init(void)
 {
+	/* Performance-monitoring supported from K7 and later: */
+	if (boot_cpu_data.x86 < 6)
+		return -ENODEV;
+
 	x86_pmu = amd_pmu;
 
 	switch (boot_cpu_data.x86) {
-- 
1.8.2.3