oprofile/x86: warn user if a counter is already active

[safe/jmp/linux-2.6] / arch / x86 / oprofile / op_model_amd.c

diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c
index a9d1947..ef9d735 100644 (file)
--- a/arch/x86/oprofile/op_model_amd.c
+++ b/arch/x86/oprofile/op_model_amd.c
@@ -194,9 +194,18 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
 
        /* clear all counters */
        for (i = 0; i < NUM_CONTROLS; ++i) {
-               if (unlikely(!msrs->controls[i].addr))
+               if (unlikely(!msrs->controls[i].addr)) {
+                       if (counter_config[i].enabled && !smp_processor_id())
+                               /*
+                                * counter is reserved, this is on all
+                                * cpus, so report only for cpu #0
+                                */
+                               op_x86_warn_reserved(i);
                        continue;
+               }
                rdmsrl(msrs->controls[i].addr, val);
+               if (val & ARCH_PERFMON_EVENTSEL0_ENABLE)
+                       op_x86_warn_in_use(i);
                val &= model->reserved;
                wrmsrl(msrs->controls[i].addr, val);
        }