linux-kernel - Re: [patch 06/11] posix-timers: Make signal_struct::next_posix_timer_id an atomic

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Message-ID: <20250224132047.GA34233@noisy.programming.kicks-ass.net>
Date: Mon, 24 Feb 2025 14:20:47 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Frederic Weisbecker <frederic@...nel.org>,
	Benjamin Segall <bsegall@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Andrey Vagin <avagin@...nvz.org>,
	Pavel Tikhomirov <ptikhomirov@...tuozzo.com>
Subject: Re: [patch 06/11] posix-timers: Make
 signal_struct::next_posix_timer_id an atomic_t

On Mon, Feb 24, 2025 at 11:15:32AM +0100, Thomas Gleixner wrote:

> +		unsigned int id = (atomic_inc_return(&sig->next_posix_timer_id) - 1) & INT_MAX;

How about:

	unsigned int id = atomic_fetch_inc(&sig->next_posix_timer_id) & INT_MAX;