linux-kernel - Re: [RFC][PATCH 2/2] time: alarmtimer: Use TASK

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Date:   Thu, 02 Mar 2023 23:21:43 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Michael Nazzareno Trimarchi <michael@...rulasolutions.com>,
        John Stultz <jstultz@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Boyd <sboyd@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Michael <michael@...isi.de>, kernel-team@...roid.com,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [RFC][PATCH 2/2] time: alarmtimer: Use TASK_FREEZABLE to
 cleanup freezer handling

On Thu, Mar 02 2023 at 15:32, Rafael J. Wysocki wrote:
> On Mon, Feb 20, 2023 at 10:19 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>> +static atomic_t alarmtimer_wakeup;
>>
>>  /**
>>   * alarmtimer_fired - Handles alarm hrtimer being fired.
>> @@ -194,6 +196,8 @@ static enum hrtimer_restart alarmtimer_f
>>         int ret = HRTIMER_NORESTART;
>>         int restart = ALARMTIMER_NORESTART;
>>
>> +       atomic_inc(&alarmtimer_wakeup);
>> +
>
> This appears to be still somewhat racy, because the notifier can run
> at this point AFAICS.

Indeed it is. Let me think more about this.