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    Subject[PATCH 4/7] 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 <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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