1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c
index cb19d650c216..418a095c5796 100644
--- a/arch/x86/kernel/time_64.c
+++ b/arch/x86/kernel/time_64.c
@@ -80,6 +80,8 @@ unsigned long __init calibrate_cpu(void)
                         break;
         no_ctr_free = (i == 4);
         if (no_ctr_free) {
+                WARN(1, KERN_WARNING "Warning: AMD perfctrs busy ... "
+                     "cpu_khz value may be incorrect.\n");
                 i = 3;
                 rdmsrl(MSR_K7_EVNTSEL3, evntsel3);
                 wrmsrl(MSR_K7_EVNTSEL3, 0);