From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:54426 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754097AbdGCLyZ (ORCPT ); Mon, 3 Jul 2017 07:54:25 -0400 Subject: Patch "x86/tsc: Add the Intel Denverton Processor to native_calibrate_tsc()" has been added to the 4.9-stable tree To: len.brown@intel.com, alexander.levin@verizon.com, gregkh@linuxfoundation.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, torvalds@linux-foundation.org Cc: , From: Date: Mon, 03 Jul 2017 13:54:15 +0200 Message-ID: <14990828553063@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled x86/tsc: Add the Intel Denverton Processor to native_calibrate_tsc() to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-tsc-add-the-intel-denverton-processor-to-native_calibrate_tsc.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Mon Jul 3 13:33:55 CEST 2017 From: Len Brown Date: Fri, 13 Jan 2017 01:11:18 -0500 Subject: x86/tsc: Add the Intel Denverton Processor to native_calibrate_tsc() From: Len Brown [ Upstream commit 695085b4bc7603551db0b3da897b8bf9893ca218 ] The Intel Denverton microserver uses a 25 MHz TSC crystal, so we can derive its exact [*] TSC frequency using CPUID and some arithmetic, eg.: TSC: 1800 MHz (25000000 Hz * 216 / 3 / 1000000) [*] 'exact' is only as good as the crystal, which should be +/- 20ppm Signed-off-by: Len Brown Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/306899f94804aece6d8fa8b4223ede3b48dbb59c.1484287748.git.len.brown@intel.com Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/tsc.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -694,6 +694,7 @@ unsigned long native_calibrate_tsc(void) crystal_khz = 24000; /* 24.0 MHz */ break; case INTEL_FAM6_SKYLAKE_X: + case INTEL_FAM6_ATOM_DENVERTON: crystal_khz = 25000; /* 25.0 MHz */ break; case INTEL_FAM6_ATOM_GOLDMONT: Patches currently in stable-queue which might be from len.brown@intel.com are queue-4.9/x86-tsc-add-the-intel-denverton-processor-to-native_calibrate_tsc.patch