Commit 03c4c7f8 authored by Like Xu's avatar Like Xu Committed by Peter Zijlstra
Browse files

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: default avatarLike Xu <like.xu@linux.intel.com>
Signed-off-by: default avatarYang Weijiang <weijiang.yang@intel.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarKan Liang <kan.liang@linux.intel.com>
Reviewed-by: default avatarAndi Kleen <ak@linux.intel.com>
Link: https://lkml.kernel.org/r/20221125040604.5051-2-weijiang.yang@intel.com
parent 1b929c02

arch/x86/events/intel/lbr.c

+1 −3
Original line number Diff line number Diff line
@@ -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);