linux-kernel - Re: [patch V5 11/26] posix-timers: Add a refcount to struct k

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Message-ID: <Zx-i89gkab0s8c-J@localhost.localdomain>
Date: Mon, 28 Oct 2024 15:42:59 +0100
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 11/26] posix-timers: Add a refcount to struct k_itimer

Le Tue, Oct 01, 2024 at 10:42:14AM +0200, Thomas Gleixner a écrit :
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> To cure the SIG_IGN handling for posix interval timers, the preallocated
> sigqueue needs to be embedded into struct k_itimer to prevent life time
> races of all sorts.
> 
> To make that work correctly it needs reference counting so that timer
> deletion does not free the timer prematuraly when there is a signal queued
> or delivered concurrently.
> 
> Add a rcuref to the posix timer part.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>

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