perf/x86/lbr: Simplify the exposure check for the LBR_INFO registers

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

Signed-off-by: Like Xu <like.xu@linux.intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: https://lkml.kernel.org/r/20221125040604.5051-2-weijiang.yang@intel.com

diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index 1f21f576ca77fee6040a4d555eeac87ec706d638..c3b0d15a9841b5edec20e10240850facae803772 100644 (file)
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -1606,12 +1606,10 @@ clear_arch_lbr:
  */
 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);