linux-kernel - Re: [RFC PATCH 01/10] timer: Prevent base->clk from moving backward

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Message-ID: <20200702143206.GC27417@lenoir>
Date:   Thu, 2 Jul 2020 16:32:07 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC PATCH 01/10] timer: Prevent base->clk from moving backward

On Thu, Jul 02, 2020 at 11:59:59AM +0200, Juri Lelli wrote:
> On 02/07/20 01:20, Frederic Weisbecker wrote:
> > On Wed, Jul 01, 2020 at 06:35:04PM +0200, Juri Lelli wrote:
> > > Guess you might be faster to understand what I'm missing. :-)
> > 
> > So, did you port only this patch or the whole set in order to
> > trigger this?
> > 
> > If it was the whole set, can you try this patch alone?
> 
> Whole set. And I can't reproduce if I try with this patch alone.
> 

Missing initialization. This should go better after this:

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 25a55c043297..f36b53219768 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1969,6 +1969,7 @@ static void __init init_timer_cpu(int cpu)
 		base->cpu = cpu;
 		raw_spin_lock_init(&base->lock);
 		base->clk = jiffies;
+		base->next_expiry = base->clk + NEXT_TIMER_MAX_DELTA;
 		timer_base_init_expiry_lock(base);
 	}
 }