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    Subject[PATCH v2 01/15] perf/x86/lbr: Simplify the exposure check for the LBR_INFO registers
    Date
    From: Like Xu <like.xu@linux.intel.com>

    The x86_pmu.lbr_info is 0 unless explicitly initialized, so there's
    no point checking x86_pmu.intel_cap.lbr_format.

    Cc: Peter Zijlstra <peterz@infradead.org>
    Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
    Reviewed-by: Andi Kleen <ak@linux.intel.com>
    Signed-off-by: Like Xu <like.xu@linux.intel.com>
    Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
    ---
    arch/x86/events/intel/lbr.c | 4 +---
    1 file changed, 1 insertion(+), 3 deletions(-)

    diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
    index 4dbde69c423b..e7caabfa1377 100644
    --- a/arch/x86/events/intel/lbr.c
    +++ b/arch/x86/events/intel/lbr.c
    @@ -1606,12 +1606,10 @@ void __init intel_pmu_arch_lbr_init(void)
    */
    void x86_perf_get_lbr(struct x86_pmu_lbr *lbr)
    {
    - int lbr_fmt = x86_pmu.intel_cap.lbr_format;
    -
    lbr->nr = x86_pmu.lbr_nr;
    lbr->from = x86_pmu.lbr_from;
    lbr->to = x86_pmu.lbr_to;
    - lbr->info = (lbr_fmt == LBR_FORMAT_INFO) ? x86_pmu.lbr_info : 0;
    + lbr->info = x86_pmu.lbr_info;
    }
    EXPORT_SYMBOL_GPL(x86_perf_get_lbr);

    --
    2.27.0
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