i7core_edac: Properly discover the first QPI device

[net-next-2.6.git] / kernel / perf_event.c

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 31d6afe9259412025f02e20bddcc37fa3bf4d62b..ff86c558af4c28dd4c9a7ea92cc592b70bee6d7d 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -1507,6 +1507,9 @@ do {                                      \
                divisor = nsec * frequency;
        }
 
+       if (!divisor)
+               return dividend;
+
        return div64_u64(dividend, divisor);
 }
 
@@ -1529,7 +1532,7 @@ static int perf_event_start(struct perf_event *event)
 static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count)
 {
        struct hw_perf_event *hwc = &event->hw;
-       u64 period, sample_period;
+       s64 period, sample_period;
        s64 delta;
 
        period = perf_calculate_period(event, nsec, count);