1 files changed, 3 insertions, 4 deletions

diff --git a/arch/x86/kernel/cpu/perf_event_msr.c b/arch/x86/kernel/cpu/perf_event_msr.c
index f32ac13934f2..ec863b9a9f78 100644
--- a/arch/x86/kernel/cpu/perf_event_msr.c
+++ b/arch/x86/kernel/cpu/perf_event_msr.c
@@ -163,10 +163,9 @@ again:
                 goto again;
 
         delta = now - prev;
-        if (unlikely(event->hw.event_base == MSR_SMI_COUNT)) {
-                delta <<= 32;
-                delta >>= 32; /* sign extend */
-        }
+        if (unlikely(event->hw.event_base == MSR_SMI_COUNT))
+                delta = sign_extend64(delta, 31);
+
         local64_add(now - prev, &event->count);
 }