Revert "powerpc/perf: Use pmc_overflow() to detect rolled back events"

This reverts commit 813312110bede27bffd082c25cd31730bd567beb.

This revert was requested by the author of the patch as it seems
to cause system hangs with some low frequency events

diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index 0db88f501f91c953c86dcbef4ab2d768be126f9d..aa2465e21f1a87b989e49eae2027fee72dc4948f 100644 (file)
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -1463,7 +1463,7 @@ static void perf_event_interrupt(struct pt_regs *regs)
                if (!event->hw.idx || is_limited_pmc(event->hw.idx))
                        continue;
                val = read_pmc(event->hw.idx);
-               if (pmc_overflow(val)) {
+               if ((int)val < 0) {
                        /* event has overflowed */
                        found = 1;
                        record_and_restart(event, val, regs);