Re: [PATCH] Revert "timers: Don't wake ktimersoftd on every tick"

From	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH] Revert "timers: Don't wake ktimersoftd on every tick"
Date	2017-05-27 09:50 +0200
Message-ID	<tLEE1-gM-5@gated-at.bofh.it> (permalink)
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On 2017-05-26 19:16:07 [+0200], Anna-Maria Gleixner wrote:
> This reverts commit 032f93cae150a.
> 
> The problem is that the look ahead optimization from the tick timer
> interrupt context can race with the softirq thread expiring timer. As
> a consequence the temporary hlist heads which hold the to expire
> timers are overwritten and the timers which are already removed from
> the wheel bucket for expiry are now dangling w/o a list head.
> 
> That means those timers never get expired. If one of those timers is
> canceled the removal operation will result in a hlist corruption.
> 
> Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>

Applied

Sebastian

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[PATCH] Revert "timers: Don't wake ktimersoftd on every tick" Anna-Maria Gleixner <anna-maria@linutronix.de> - 2017-05-26 19:20 +0200
  Re: [PATCH] Revert "timers: Don't wake ktimersoftd on every tick" Thomas Gleixner <tglx@linutronix.de> - 2017-05-26 21:50 +0200
    Re: [PATCH] Revert "timers: Don't wake ktimersoftd on every tick" Thomas Gleixner <tglx@linutronix.de> - 2017-05-27 03:40 +0200
      Re: [PATCH] Revert "timers: Don't wake ktimersoftd on every tick" Thomas Gleixner <tglx@linutronix.de> - 2017-06-04 16:20 +0200
  Re: [PATCH] Revert "timers: Don't wake ktimersoftd on every tick" Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2017-05-27 09:50 +0200

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