linux-kernel - Re: [patch V5 05/26] posix-timers: Drop signal if timer has been deleted or reprogrammed

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Message-ID: <87ttd16gif.ffs@tglx>
Date: Thu, 24 Oct 2024 10:40:08 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Frederic Weisbecker <frederic@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Anna-Maria Behnsen
 <anna-maria@...utronix.de>, John Stultz <jstultz@...gle.com>, Peter
 Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, Stephen
 Boyd <sboyd@...nel.org>, Eric Biederman <ebiederm@...ssion.com>, Oleg
 Nesterov <oleg@...hat.com>
Subject: Re: [patch V5 05/26] posix-timers: Drop signal if timer has been
 deleted or reprogrammed

On Mon, Oct 21 2024 at 14:29, Frederic Weisbecker wrote:
> Le Tue, Oct 01, 2024 at 10:42:06AM +0200, Thomas Gleixner a écrit :
>> No point in delivering a signal from the past. POSIX does not specify the
>> behaviour here:
>> 
>>  - "The effect of disarming or resetting a timer with pending expiration
>>     notifications is unspecified."
>> 
>>  - "The disposition of pending signals for the deleted timer is unspecified."
>> 
>> In both cases it is reasonable to expect that pending signals are
>> discarded. Especially in the reprogramming case it does not make sense to
>> account for previous overruns or to deliver a signal for a timer which has
>> been disarmed.
>
> The change below indeed checks if the timer has been deleted but not if
> it has been reprogrammed/disarmed/reset.
>
> Or am I missing something?

No. You are right. This is a change log left over from a previous
version. This rearm/disarm part is handled later in the series.

Thanks,

        tglx