linux-kernel - Re: [PATCH v2 31/37] mac80211_hwsim: Replace hrtimer tasklet with softirq hrtimer

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Date:   Mon, 23 Oct 2017 12:23:13 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Johannes Berg <johannes@...solutions.net>
cc:     Anna-Maria Gleixner <anna-maria@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, keescook@...omium.org,
        Christoph Hellwig <hch@....de>,
        John Stultz <john.stultz@...aro.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org
Subject: Re: [PATCH v2 31/37] mac80211_hwsim: Replace hrtimer tasklet with
 softirq hrtimer

On Mon, 23 Oct 2017, Johannes Berg wrote:

> On Sun, 2017-10-22 at 23:40 +0200, Anna-Maria Gleixner wrote:
> > From: Thomas Gleixner <tglx@...utronix.de>
> > 
> > Switch the timer to HRTIMER_MODE_SOFT, which executed the timer
> > callback in softirq context and remove the hrtimer_tasklet.

I can't build as its part of the whole hrtimer rework series.

> This doesn't build on my tree, due to HRTIMER_MODE_REL_SOFT not
> existing. Neither does HRTIMER_MODE_SOFT mentioned above, but that's
> just a commit log mistake.

Oops.

> (It also didn't apply on my tree, but that was a trivial context
> change.)
> 
> I don't understand why you initialize it with HRTIMER_MODE_ABS_SOFT
> either though:
> 
> > +       hrtimer_init(&data->beacon_timer, CLOCK_MONOTONIC,
> > +                    HRTIMER_MODE_ABS_SOFT);

Sure, though it does not matter in that case. Will fix that up.

Thanks,

	tglx