Messages in this thread Patch in this message | | | Date | Tue, 19 Oct 2010 15:43:00 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 4/7] perf, x86: Fixup the precise_ip computation |
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In case we don't have PEBS, the LBR fixup doesn't make sense.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> --- arch/x86/kernel/cpu/perf_event.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
Index: linux-2.6/arch/x86/kernel/cpu/perf_event.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/cpu/perf_event.c +++ linux-2.6/arch/x86/kernel/cpu/perf_event.c @@ -497,12 +497,13 @@ static int x86_pmu_hw_config(struct perf 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;
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