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From: Jiri Bohac <jbohac@suse.cz>
To: John Stultz <johnstul@us.ibm.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Prarit Bhargava <prarit@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	stable@vger.kernel.org
Subject: Re: [PATCH 0/6] Fix for leapsecond caused hrtimer/futex issue (updated)
Date: Fri, 13 Jul 2012 00:43:34 +0200	[thread overview]
Message-ID: <20120712224334.GA32620@midget.suse.cz> (raw)
In-Reply-To: <4FFCB287.80701@us.ibm.com>

On Tue, Jul 10, 2012 at 03:53:59PM -0700, John Stultz wrote:
> On 07/10/2012 03:43 PM, John Stultz wrote:
> >Over the weekend, Thomas got a chance to review the leap second fix
> >in more detail and had a few additional changes he wanted to make
> >to improve performance as well as style.
> >
> >So this iteration includes his modifications.
> >
> >Once merged, I'll be working to get the backports finished as quickly
> >as I can and sent to -stable.

looking at the proposed 2.6.32.y stable patch at:
http://git.linaro.org/gitweb?p=people/jstultz/linux.git;a=commitdiff;h=18d208632bf17aed56c581b882868b2be44be71e;hp=6d224606bb8eec78027522d6dd5abfea8108c41a
Is this the final version you are about to send to -stable?

In 2.6.32 timekeeping_leap_insert() is not called from the timer
interrupt, but from the leap_timer hrtimer.

I think the new clock_was_set_timer will thus not be called by
irq_exit() because TIMER_SOFTIRQ has not been raised. Unless
TIMER_SOFTIRQ is raised, clock_was_set() will not be called until
the next periodic timer interrupt, correct?

Wouldn't the original schedule_work() approach work better for
2.6.32?

Or do you plan backporting the most recent version to 2.6.32?

Thanks,

-- 
Jiri Bohac <jbohac@suse.cz>
SUSE Labs, SUSE CZ


  reply	other threads:[~2012-07-12 22:57 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-10 22:43 [PATCH 0/6] Fix for leapsecond caused hrtimer/futex issue (updated) John Stultz
2012-07-10 22:43 ` [PATCH 1/6] hrtimer: Provide clock_was_set_delayed() John Stultz
2012-07-11 12:15   ` Prarit Bhargava
2012-07-11 12:45     ` Thomas Gleixner
2012-07-11 13:05       ` Peter Zijlstra
2012-07-11 15:18         ` Thomas Gleixner
2012-07-11 15:56           ` Peter Zijlstra
2012-07-11 16:47           ` John Stultz
2012-07-12  7:44             ` Jan Ceuleers
2012-07-12 12:29               ` Prarit Bhargava
2012-07-11 13:05       ` Prarit Bhargava
2012-07-11 13:38         ` Peter Zijlstra
2012-07-11 21:40   ` [tip:timers/urgent] " tip-bot for John Stultz
2012-07-10 22:43 ` [PATCH 2/6] timekeeping: Fix leapsecond triggered load spike issue John Stultz
2012-07-11 21:41   ` [tip:timers/urgent] " tip-bot for John Stultz
2012-07-10 22:43 ` [PATCH 3/6] timekeeping: Maintain ktime_t based offsets for hrtimers John Stultz
2012-07-11 21:42   ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
2012-07-10 22:43 ` [PATCH 4/6] hrtimer: Move lock held region in hrtimer_interrupt() John Stultz
2012-07-10 22:43 ` [PATCH 4/6] hrtimers: " John Stultz
2012-07-11 21:43   ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
2012-07-10 22:43 ` [PATCH 5/6] timekeeping: Provide hrtimer update function John Stultz
2012-07-11 21:44   ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
2012-07-10 22:43 ` [PATCH 6/6] hrtimer: Update hrtimer base offsets each hrtimer_interrupt John Stultz
2012-07-11 21:45   ` [tip:timers/urgent] " tip-bot for John Stultz
2012-07-15 15:22   ` [PATCH 6/6] " Andreas Schwab
2012-07-15 15:22     ` Andreas Schwab
2012-07-15 20:28     ` Rafael J. Wysocki
2012-07-15 20:28       ` Rafael J. Wysocki
     [not found]   ` <m2y5mlnj5z.fsf__49536.0585897744$1342365803$gmane$org@igel.home>
2012-07-15 16:02     ` Andreas Schwab
2012-07-10 22:53 ` [PATCH 0/6] Fix for leapsecond caused hrtimer/futex issue (updated) John Stultz
2012-07-12 22:43   ` Jiri Bohac [this message]
2012-07-12 23:58     ` John Stultz
2012-07-10 23:00 ` John Stultz
2012-07-13  0:43   ` John Stultz
2012-07-11 10:59 ` Peter Zijlstra
2012-07-11 11:17 ` Ingo Molnar
2012-07-12 12:32   ` Prarit Bhargava
2012-07-11 12:16 ` Prarit Bhargava

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