From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757364Ab3BKNt4 (ORCPT ); Mon, 11 Feb 2013 08:49:56 -0500 Received: from e06smtp14.uk.ibm.com ([195.75.94.110]:55007 "EHLO e06smtp14.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757215Ab3BKNtz (ORCPT ); Mon, 11 Feb 2013 08:49:55 -0500 Date: Mon, 11 Feb 2013 14:49:43 +0100 From: Martin Schwidefsky To: Linus Torvalds Cc: linux-kernel , linux-s390 , Heiko Carstens Subject: [GIT PULL] s390 regression patch for 3.8-rc8 Message-ID: <20130211144943.69c83140@mschwide> Organization: IBM Corporation X-Mailer: Claws Mail 3.8.0 (GTK+ 2.24.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit x-cbid: 13021113-1948-0000-0000-000004456D07 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Linus, please pull from the 'for-linus' branch of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git for-linus to receive the following updates: The recent fix for the s390 sched_clock() function uncovered yet another bug in s390_next_ktime which causes an endless loop in KVM. This regression should be fixed before v3.8. I keep the fingers crossed that this is the last one for v3.8. Heiko Carstens (1): s390/timer: avoid overflow when programming clock comparator arch/s390/kernel/time.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index a5f4f5a..0aa98db 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -120,6 +120,9 @@ static int s390_next_ktime(ktime_t expires, nsecs = ktime_to_ns(ktime_add(timespec_to_ktime(ts), expires)); do_div(nsecs, 125); S390_lowcore.clock_comparator = sched_clock_base_cc + (nsecs << 9); + /* Program the maximum value if we have an overflow (== year 2042) */ + if (unlikely(S390_lowcore.clock_comparator < sched_clock_base_cc)) + S390_lowcore.clock_comparator = -1ULL; set_clock_comparator(S390_lowcore.clock_comparator); return 0; }