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From:   Yang Weijiang <weijiang.yang@intel.com>
To:     pbonzini@redhat.com, seanjc@google.com, vkuznets@redhat.com,
        jmattson@google.com, wei.w.wang@intel.com, like.xu.linux@gmail.com,
        kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Like Xu <like.xu@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Yang Weijiang <weijiang.yang@intel.com>
Subject: [PATCH v5 02/13] perf/x86/lbr: Simplify the exposure check for the LBR_INFO registers
Date:   Fri,  9 Jul 2021 18:05:00 +0800
Message-Id: <1625825111-6604-3-git-send-email-weijiang.yang@intel.com>
In-Reply-To: <1625825111-6604-1-git-send-email-weijiang.yang@intel.com>
References: <1625825111-6604-1-git-send-email-weijiang.yang@intel.com>
Precedence: bulk

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 e8453de7a964..46dc8f6cc21a 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -1848,12 +1848,10 @@ void __init intel_pmu_arch_lbr_init(void)
  */
 int 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;
 
 	return 0;
 }
-- 
2.21.1