linux-kernel - Re: [patch V5 21/26] posix-timers: Handle ignored list on delete and exit

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Message-ID: <87bjz1xq8s.ffs@tglx>
Date: Wed, 30 Oct 2024 21:58:11 +0100
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 21/26] posix-timers: Handle ignored list on delete
 and exit

On Wed, Oct 30 2024 at 18:34, Thomas Gleixner wrote:

> On Wed, Oct 30 2024 at 18:06, Frederic Weisbecker wrote:
>>> +
>>> +	/* Mop up timers which are on the ignored list */
>>> +	hlist_move_list(&tsk->signal->ignored_posix_timers, &timers);
>>> +	while (!hlist_empty(&timers))
>>> +		posix_timer_cleanup_ignored(hlist_entry(timers.first, struct k_itimer, list));
>>
>> The ignored timers should have all been removed on timer_delete() and
>> itimer_delete(), right?
>>
>> So should it be instead:
>>
>>    WARN_ON_ONCE(!hlist_empty(&tsk->signal->ignored_posix_timers))
>
> Except for those which have not been removed by the application on
> exit() or in a case where the kernel kills the task. Then the exit
> cleanup has to mop up for them :)

Bah. I'm an idiot. Of course they are already mopped up...