linux-kernel - Re: [patch V5 04/26] signal: Allow POSIX timer signals to be dropped

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Message-ID: <ZxZHDK2fSjnS3SLi@localhost.localdomain>
Date: Mon, 21 Oct 2024 14:20:28 +0200
From: Frederic Weisbecker <frederic@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
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 04/26] signal: Allow POSIX timer signals to be dropped

Le Tue, Oct 01, 2024 at 10:42:04AM +0200, Thomas Gleixner a écrit :
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> In case that a timer was reprogrammed or deleted an already pending signal
> is obsolete. Right now such signals are kept around and eventually
> delivered. While POSIX is blury about this:
> 
>  - "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."
> 
> it is reasonable in both cases to expect that pending signals are discarded
> as they have no meaning anymore.
> 
> Prepare the signal code to allow dropping posix timer signals.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Reviewed-by: Frederic Weisbecker <frederic@...nel.org>