From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:50758 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750892AbdGYVnM (ORCPT ); Tue, 25 Jul 2017 17:43:12 -0400 Subject: Patch "alarmtimer: don't rate limit one-shot timers" has been added to the 4.12-stable tree To: ghackmann@google.com, fennema@google.com, gregkh@linuxfoundation.org, john.stultz@linaro.org, tglx@linutronix.de Cc: , From: Date: Tue, 25 Jul 2017 14:43:05 -0700 In-Reply-To: <20170725194246.78059-1-ghackmann@google.com> Message-ID: <1501018985120129@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 alarmtimer: don't rate limit one-shot timers to the 4.12-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: alarmtimer-don-t-rate-limit-one-shot-timers.patch and it can be found in the queue-4.12 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From ghackmann@google.com Tue Jul 25 14:42:30 2017 From: Greg Hackmann Date: Tue, 25 Jul 2017 12:42:46 -0700 Subject: alarmtimer: don't rate limit one-shot timers To: John Stultz , Thomas Gleixner Cc: Ben Fennema , linux-kernel@vger.kernel.org, Greg Hackmann , stable@vger.kernel.org Message-ID: <20170725194246.78059-1-ghackmann@google.com> From: Greg Hackmann Commit ff86bf0c65f1 ("alarmtimer: Rate limit periodic intervals") sets a minimum bound on the alarm timer interval. This minimum bound shouldn't be applied if the interval is 0. Otherwise, one-shot timers will be converted into periodic ones. This patch is specific to 4.11.y and 4.12.y. Older -stable trees have a slightly different patch, and 4.13-rc2 isn't impacted due to a later refactoring. Fixes: ff86bf0c65f1 ("alarmtimer: Rate limit periodic intervals") Reported-by: Ben Fennema Signed-off-by: Greg Hackmann Cc: John Stultz Reviewed-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman --- kernel/time/alarmtimer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/time/alarmtimer.c +++ b/kernel/time/alarmtimer.c @@ -665,7 +665,7 @@ static int alarm_timer_set(struct k_itim * Rate limit to the tick as a hot fix to prevent DOS. Will be * mopped up later. */ - if (timr->it.alarm.interval < TICK_NSEC) + if (timr->it.alarm.interval && timr->it.alarm.interval < TICK_NSEC) timr->it.alarm.interval = TICK_NSEC; exp = timespec64_to_ktime(new_setting->it_value); Patches currently in stable-queue which might be from ghackmann@google.com are queue-4.12/alarmtimer-don-t-rate-limit-one-shot-timers.patch