perf_counter, x86: Check old-AMD performance monitoring support
authorJaswinder Singh Rajput <jaswinder@kernel.org>
Thu, 11 Jun 2009 09:58:09 +0000 (15:28 +0530)
committerIngo Molnar <mingo@elte.hu>
Sat, 13 Jun 2009 10:58:25 +0000 (12:58 +0200)
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

index 275bc142cd5ddab2d530be5819744fbaafd831d9..3c37c3930ca1f0087d76db7f36ed1c5042e34df1 100644 (file)
@@ -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) {