[PATCH 1/2 -tip] x86: perf_counter check AMD performancemonitoring support

[Jaswinder Singh Rajput]

AMD supports performance monitoring from K7.

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@xxxxxxxxx>
---
 arch/x86/kernel/cpu/perf_counter.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 57ae1be..719a7d5 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -1452,6 +1452,10 @@ static int intel_pmu_init(void)
 
 static int amd_pmu_init(void)
 {
+	/* performance-monitoring supported from K7 */
+	if (boot_cpu_data.x86 < 6)
+		return -ENODEV;
+
 	x86_pmu = amd_pmu;
 
 	switch (boot_cpu_data.x86) {
-- 
1.6.0.6



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