From 5553be2620ac901c21a25657bd5b59f73254e6d5 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 19 Oct 2010 14:38:11 +0200 Subject: [PATCH] perf, x86: Fixup the precise_ip computation In case we don't have PEBS, the LBR fixup doesn't make sense. Signed-off-by: Peter Zijlstra Acked-by: Stephane Eranian LKML-Reference: <20101019134808.354429461@chello.nl> Signed-off-by: Ingo Molnar --- arch/x86/kernel/cpu/perf_event.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index fe73c1844a9a..f369c53315a5 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -497,12 +497,13 @@ static int x86_pmu_hw_config(struct perf_event *event) int precise = 0; /* Support for constant skid */ - if (x86_pmu.pebs) + if (x86_pmu.pebs) { precise++; - /* Support for IP fixup */ - if (x86_pmu.lbr_nr) - precise++; + /* Support for IP fixup */ + if (x86_pmu.lbr_nr) + precise++; + } if (event->attr.precise_ip > precise) return -EOPNOTSUPP; -- 2.20.1