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

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Date:   Wed, 15 Feb 2023 14:52:12 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Michael Nazzareno Trimarchi <michael@...rulasolutions.com>,
        John Stultz <jstultz@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Stephen Boyd <sboyd@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Michael <michael@...isi.de>, kernel-team@...roid.com
Subject: Re: [RFC][PATCH 2/2] time: alarmtimer: Use TASK_FREEZABLE to
 cleanup freezer handling

On Wed, Feb 15 2023 at 09:22, Michael Nazzareno Trimarchi wrote:
> On Sat, Feb 11, 2023 at 7:45 AM John Stultz <jstultz@...gle.com> wrote:
>>  /**
>>   * clock2alarm - helper that converts from clockid to alarmtypes
>>   * @clockid: clockid.
>> @@ -750,7 +703,7 @@ static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp,
>>         struct restart_block *restart;
>>         alarm->data = (void *)current;
>>         do {
>> -               set_current_state(TASK_INTERRUPTIBLE);
>> +               set_current_state(TASK_INTERRUPTIBLE | TASK_FREEZABLE);
>
> For kernel 5.10.x and lts is possible to use freezable_schedule and
> let this set_current_state as was before.
> I have seen patch that introduce the new state but I suppose that in
> order to be compatible to stable this should be the
> change. Am I right?

We always work against upstream first and there freezable_schedule() is
gone. Backports have to be sorted seperately.

Thanks,

        tglx