Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757334AbbGPCRP (ORCPT ); Wed, 15 Jul 2015 22:17:15 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:55271 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754167AbbGPBKE (ORCPT ); Wed, 15 Jul 2015 21:10:04 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Joe Konno , "Rafael J. Wysocki" , Kamal Mostafa Subject: [PATCH 3.19.y-ckt 032/251] intel_pstate: set BYT MSR with wrmsrl_on_cpu() Date: Wed, 15 Jul 2015 18:05:53 -0700 Message-Id: <1437008972-9140-33-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1437008972-9140-1-git-send-email-kamal@canonical.com> References: <1437008972-9140-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.19 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1629 Lines: 45 3.19.8-ckt4 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Joe Konno commit 0dd23f94251f49da99a6cbfb22418b2d757d77d6 upstream. Commit 007bea098b86 (intel_pstate: Add setting voltage value for baytrail P states.) introduced byt_set_pstate() with the assumption that it would always be run by the CPU whose MSR is to be written by it. It turns out, however, that is not always the case in practice, so modify byt_set_pstate() to enforce the MSR write done by it to always happen on the right CPU. Fixes: 007bea098b86 (intel_pstate: Add setting voltage value for baytrail P states.) Signed-off-by: Joe Konno Acked-by: Kristen Carlson Accardi Signed-off-by: Rafael J. Wysocki Signed-off-by: Kamal Mostafa --- drivers/cpufreq/intel_pstate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 742eefb..c37c895 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -497,7 +497,7 @@ static void byt_set_pstate(struct cpudata *cpudata, int pstate) val |= vid; - wrmsrl(MSR_IA32_PERF_CTL, val); + wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val); } #define BYT_BCLK_FREQS 5 -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/