linux-kernel - Re: [patch V5 07/26] posix-timers: Add proper state tracking

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Message-ID: <87r0856g9n.ffs@tglx>
Date: Thu, 24 Oct 2024 10:45:24 +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 07/26] posix-timers: Add proper state tracking

On Mon, Oct 21 2024 at 15:19, Frederic Weisbecker wrote:

> Le Tue, Oct 01, 2024 at 10:42:09AM +0200, Thomas Gleixner a écrit :
>> From: Thomas Gleixner <tglx@...utronix.de>
>> 
>> Right now the state tracking is done by two struct members:
>> 
>>  - it_active:
>>      A boolean which tracks armed/disarmed state
>> 
>>  - it_signal_seq:
>>      A sequence counter which is used to invalidate settings
>>      and prevent rearming
>> 
>> Replace it_active with it_status and keep properly track about the states
>> in one place.
>> 
>> This allows to reuse it_signal_seq to track reprogramming, disarm and
>
> Did you mean it_status here?

No. it_signal_seq is used to validate whether a queued, but not yet
delivered signal, is valid or not. The sequence is stored in the signal
when the signal is queued and compared to the sequence on delivery.

Thanks,

        tglx