convert 'memory' sysdev_class to a regular subsystem

[pandora-kernel.git] / arch / powerpc / kernel / perf_event.c

diff --git a/arch/powerpc/kernel/perf_event.c b/arch/powerpc/kernel/perf_event.c
index 10a140f..64483fd 100644 (file)
--- a/arch/powerpc/kernel/perf_event.c
+++ b/arch/powerpc/kernel/perf_event.c
@@ -865,6 +865,7 @@ static void power_pmu_start(struct perf_event *event, int ef_flags)
 {
        unsigned long flags;
        s64 left;
+       unsigned long val;
 
        if (!event->hw.idx || !event->hw.sample_period)
                return;
@@ -880,7 +881,12 @@ static void power_pmu_start(struct perf_event *event, int ef_flags)
 
        event->hw.state = 0;
        left = local64_read(&event->hw.period_left);
-       write_pmc(event->hw.idx, left);
+
+       val = 0;
+       if (left < 0x80000000L)
+               val = 0x80000000L - left;
+
+       write_pmc(event->hw.idx, val);
 
        perf_event_update_userpage(event);
        perf_pmu_enable(event->pmu);