[tip: perf/core] perf/x86/lbr: Simplify the exposure check for the LBR_INFO registers

tip-bot2 for Like Xu
2022-12-27T11:59:34Z

The following commit has been merged into the perf/core branch of tip:

Commit-ID: 03c4c7f88709fac0e20b6a48357c73d6fc50e544
Gitweb: https://git.kernel.org/tip/03c4c7f88709fac0e20b6a48357c73d6fc50e544
Author: Like Xu <like.xu@linux.intel.com>
AuthorDate: Thu, 24 Nov 2022 23:05:50 -05:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 27 Dec 2022 12:52:07 +01:00

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
---
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 1f21f57..c3b0d15 100644
--- 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);