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

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Date:   Mon, 23 Oct 2017 12:14:51 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Anna-Maria Gleixner <anna-maria@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        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 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.

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.

(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);

shouldn't that already be REL?

johannes