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

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Message-ID: <CANn89i+6HRUtHchZ9s94ORw=B+CZ2KSU6--M6Tszsb6F0M2Sdg@mail.gmail.com>
Date: Mon, 24 Feb 2025 14:34:35 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, 
	Anna-Maria Behnsen <anna-maria@...utronix.de>, Frederic Weisbecker <frederic@...nel.org>, 
	Benjamin Segall <bsegall@...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 2:20 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> 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;

NIce, it seems few calls in net trees could use this as well.