From 72523d8082df3d89bffe30cbc1356dbb45ab51ae Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Thu, 18 Oct 2012 10:36:11 +1100 Subject: [PATCH] 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 --- arch/powerpc/perf/core-book3s.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c index 0db88f501f9..aa2465e21f1 100644 --- 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); -- 2.20.1