From patchwork Fri Jul 9 10:05:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Yang, Weijiang" X-Patchwork-Id: 12367045 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9F831C07E9C for ; Fri, 9 Jul 2021 09:51:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 86459613D1 for ; Fri, 9 Jul 2021 09:51:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232075AbhGIJxx (ORCPT ); Fri, 9 Jul 2021 05:53:53 -0400 Received: from mga05.intel.com ([192.55.52.43]:54426 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231956AbhGIJxx (ORCPT ); Fri, 9 Jul 2021 05:53:53 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10039"; a="295316496" X-IronPort-AV: E=Sophos;i="5.84,226,1620716400"; d="scan'208";a="295316496" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Jul 2021 02:51:09 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,226,1620716400"; d="scan'208";a="498856283" Received: from michael-optiplex-9020.sh.intel.com ([10.239.159.182]) by fmsmga002.fm.intel.com with ESMTP; 09 Jul 2021 02:51:07 -0700 From: Yang Weijiang 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 , Peter Zijlstra , Yang Weijiang 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> X-Mailer: git-send-email 2.7.4 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 List-ID: X-Mailing-List: kvm@vger.kernel.org From: Like Xu 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 Reviewed-by: Kan Liang Reviewed-by: Andi Kleen Signed-off-by: Like Xu Signed-off-by: Yang Weijiang --- 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; }