linux-kernel - Re: [PATCH 2/2] tick: Make sure tick timer is active when bypassing reprogramming

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Message-ID: <1492704085.8850.202.camel@redhat.com>
Date:   Thu, 20 Apr 2017 12:01:25 -0400
From:   Rik van Riel <riel@...hat.com>
To:     Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        James Hartsock <hartsjc@...hat.com>, stable@...r.kernel.org,
        Tim Wright <tim@...bash.co.uk>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH 2/2] tick: Make sure tick timer is active when bypassing
 reprogramming

On Thu, 2017-04-20 at 17:30 +0200, Frederic Weisbecker wrote:
> So far we have run into too much troubles with the optimization path
> that skips reprogramming the clock on IRQ exit when the expiration
> deadline hasn't changed. If by accident the cached deadline happens
> to
> be out of sync with the hardware deadline, the buggy result and its
> cause are hard to investigate. So lets detect and warn about the
> issue
> early.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Tim Wright <tim@...bash.co.uk>
> Cc: Pavel Machek <pavel@....cz>
> Cc: James Hartsock <hartsjc@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Rik van Riel <riel@...hat.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...nel.org>

Acked-by: Rik van Riel <riel@...hat.com>