1 files changed, 2 insertions, 2 deletions

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 2881145cda86..6c72e72e975c 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -476,7 +476,7 @@ struct perf_event_mmap_page {
          *   u64 delta;
          *
          *   quot = (cyc >> time_shift);
-         *   rem = cyc & ((1 << time_shift) - 1);
+         *   rem = cyc & (((u64)1 << time_shift) - 1);
          *   delta = time_offset + quot * time_mult +
          *              ((rem * time_mult) >> time_shift);
          *
@@ -507,7 +507,7 @@ struct perf_event_mmap_page {
          * And vice versa:
          *
          *   quot = cyc >> time_shift;
-         *   rem  = cyc & ((1 << time_shift) - 1);
+         *   rem  = cyc & (((u64)1 << time_shift) - 1);
          *   timestamp = time_zero + quot * time_mult +
          *               ((rem * time_mult) >> time_shift);
          */