From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762833AbZAWGVh (ORCPT ); Fri, 23 Jan 2009 01:21:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760908AbZAWGQe (ORCPT ); Fri, 23 Jan 2009 01:16:34 -0500 Received: from kroah.org ([198.145.64.141]:36226 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1760892AbZAWGQd (ORCPT ); Fri, 23 Jan 2009 01:16:33 -0500 Date: Thu, 22 Jan 2009 22:13:41 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: Justin Forbes , Zwane Mwaikambo , "Theodore Ts'o" , Randy Dunlap , Dave Jones , Chuck Wolber , Chris Wedgwood , Michael Krufky , Chuck Ebbert , Domenico Andreoli , Willy Tarreau , Rodrigo Rubira Branco , Jake Edge , Eugene Teo , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Tony Luck Subject: [patch 14/40] IA64: Turn on CONFIG_HAVE_UNSTABLE_CLOCK Message-ID: <20090123061341.GN2922@kroah.com> References: <20090123001330.046404396@mini.kroah.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline; filename="ia64-turn-on-config_have_unstable_clock.patch" In-Reply-To: <20090123001908.GA7397@kroah.com> User-Agent: Mutt/1.5.16 (2007-06-09) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Tony Luck commit 0773a6cf673316440999752e23f8c3d4f85e48b9 upstream. sched_clock() on ia64 is based on ar.itc, so is never completely synchronized between cpus. On some platforms (e.g. certain models of SGI Altix) it may be running at radically different frequencies. Based on a patch from Dimitri Sivanich which set this just for SN2 && GENERIC kernels ... it is needed for all ia64 machines. Signed-off-by: Tony Luck Signed-off-by: Greg Kroah-Hartman --- arch/ia64/Kconfig | 1 + 1 file changed, 1 insertion(+) --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -15,6 +15,7 @@ config IA64 select ACPI if (!IA64_HP_SIM) select PM if (!IA64_HP_SIM) select ARCH_SUPPORTS_MSI + select HAVE_UNSTABLE_SCHED_CLOCK select HAVE_IDE select HAVE_OPROFILE select HAVE_KPROBES