From nobody Sun Feb 8 21:47:15 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9167CC433EF for ; Tue, 17 May 2022 15:42:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345500AbiEQPm5 (ORCPT ); Tue, 17 May 2022 11:42:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57284 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350474AbiEQPlf (ORCPT ); Tue, 17 May 2022 11:41:35 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA2C54130C; Tue, 17 May 2022 08:41:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1652802094; x=1684338094; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bybU1LR0dCz2wUxGc5274gqzruD0/zCUSImGb6leP60=; b=iWcp+zC12TwmnePKVb1g5rCzNWbAWU3rL31d6cz6+Aw+UCXFWy2cTFKc WgiU+TANlGTzzhTR2pvb/YeKv16nSZXOQ1KdJx0LjXAKjmd+z3ho8Reno X4E7/KtteIgAihwNIG+hpgwviHA9cVTCMKi08VPNqvgZnAOnb77PwSmRg cb3yvJzo+oOtIeuW2TSdh8C1Zh1e8xDbAnHEHUpWSNIRU2FMNJ59Xpu48 /RQfJ+BgE+ABVxCgMLnHiq3d9nacAOe3RvGhi5XiXioCWC84c1kvvNF7D HIEAzTrD6iItVKlb9BXlNLqozIMsQAIFqgD9exOlWdTIG+v1ZWqmX1hbF Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10350"; a="357632094" X-IronPort-AV: E=Sophos;i="5.91,233,1647327600"; d="scan'208";a="357632094" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 May 2022 08:41:33 -0700 X-IronPort-AV: E=Sophos;i="5.91,233,1647327600"; d="scan'208";a="626533554" Received: from embargo.jf.intel.com ([10.165.9.183]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 May 2022 08:41:32 -0700 From: Yang Weijiang To: pbonzini@redhat.com, jmattson@google.com, seanjc@google.com, like.xu.linux@gmail.com, vkuznets@redhat.com, kan.liang@linux.intel.com, wei.w.wang@intel.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Like Xu , Peter Zijlstra , Andi Kleen , Yang Weijiang Subject: [PATCH v12 02/16] perf/x86/lbr: Simplify the exposure check for the LBR_INFO registers Date: Tue, 17 May 2022 11:40:46 -0400 Message-Id: <20220517154100.29983-3-weijiang.yang@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220517154100.29983-1-weijiang.yang@intel.com> References: <20220517154100.29983-1-weijiang.yang@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 fe1742c4ca49..4529ce448b2e 100644 --- a/arch/x86/events/intel/lbr.c +++ b/arch/x86/events/intel/lbr.c @@ -1874,12 +1874,10 @@ void __init intel_pmu_arch_lbr_init(void) */ int x86_perf_get_lbr(struct x86_pmu_lbr *lbr) { - int lbr_fmt =3D x86_pmu.intel_cap.lbr_format; - lbr->nr =3D x86_pmu.lbr_nr; lbr->from =3D x86_pmu.lbr_from; lbr->to =3D x86_pmu.lbr_to; - lbr->info =3D (lbr_fmt =3D=3D LBR_FORMAT_INFO) ? x86_pmu.lbr_info : 0; + lbr->info =3D x86_pmu.lbr_info; =20 return 0; } --=20 2.27.0