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From: Prarit Bhargava <prarit@redhat.com>
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>,
	Thomas Gleixner <tglx@linutronix.de>,
	stable@vger.kernel.org
Subject: Re: [PATCH 1/6] hrtimer: Provide clock_was_set_delayed()
Date: Wed, 11 Jul 2012 08:15:22 -0400	[thread overview]
Message-ID: <4FFD6E5A.9060206@redhat.com> (raw)
In-Reply-To: <1341960205-56738-2-git-send-email-johnstul@us.ibm.com>



On 07/10/2012 06:43 PM, John Stultz wrote:
> clock_was_set() cannot be called from hard interrupt context because
> it calls on_each_cpu(). For fixing the widely reported leap seconds
> issue it's necessary to call it from the timer interrupt context.
> 
> Provide a new function which denotes it in the hrtimer cpu base
> structure of the cpu on which it is called and raising the timer
> softirq.
> 
> We then execute the clock_was_set() notificiation in the timer softirq
> context in hrtimer_run_pending().

I wish there was a nicer way to do this ... but looking at the code I can't
figure out a better way.  (no offense John, it's just the way the code is ;) )

P.

  reply	other threads:[~2012-07-11 12:15 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 [this message]
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
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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