Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932597AbcKOUVT (ORCPT ); Tue, 15 Nov 2016 15:21:19 -0500 Received: from mga14.intel.com ([192.55.52.115]:61335 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751749AbcKOUVQ (ORCPT ); Tue, 15 Nov 2016 15:21:16 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,496,1473145200"; d="scan'208";a="786813650" From: Bin Gao To: Thomas Gleixner Cc: Ingo Molnar , H Peter Anvin , x86@kernel.org, Peter Zijlstra , linux-kernel@vger.kernel.org, Bin Gao Subject: [PATCH 3/4] x86/tsc: mark Intel ATOM_GOLDMONT TSC reliable Date: Tue, 15 Nov 2016 12:27:23 -0800 Message-Id: <1479241644-234277-4-git-send-email-bin.gao@linux.intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1479241644-234277-1-git-send-email-bin.gao@linux.intel.com> References: <1479241644-234277-1-git-send-email-bin.gao@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 789 Lines: 28 On Intel GOLDMONT Atom SoC TSC is the only reliable clocksource. We mark TSC reliable to avoid watchdog on it. Signed-off-by: Bin Gao --- arch/x86/kernel/tsc.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index f1a7fb5..354b302 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -709,6 +709,13 @@ unsigned long native_calibrate_tsc(void) */ setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ); + /* + * For Atom SoCs TSC is the only reliable clocksource. + * Mark TSC reliable so no watchdog on it. + */ + if (boot_cpu_data.x86_model == INTEL_FAM6_ATOM_GOLDMONT) + setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE); + return crystal_khz * ebx_numerator / eax_denominator; } -- 1.9.1