oprofile/x86: add comment to counter-in-use warning

[safe/jmp/linux-2.6] / arch / x86 / oprofile / op_x86_model.h

diff --git a/arch/x86/oprofile/op_x86_model.h b/arch/x86/oprofile/op_x86_model.h
index 59fa2bd..ff82a75 100644 (file)
--- a/arch/x86/oprofile/op_x86_model.h
+++ b/arch/x86/oprofile/op_x86_model.h
@@ -59,6 +59,15 @@ struct op_counter_config;
 
 static inline void op_x86_warn_in_use(int counter)
 {
+       /*
+        * The warning indicates an already running counter. If
+        * oprofile doesn't collect data, then try using a different
+        * performance counter on your platform to monitor the desired
+        * event. Delete counter #%d from the desired event by editing
+        * the /usr/share/oprofile/%s/<cpu>/events file. If the event
+        * cannot be monitored by any other counter, contact your
+        * hardware or BIOS vendor.
+        */
        pr_warning("oprofile: counter #%d on cpu #%d may already be used\n",
                   counter, smp_processor_id());
 }