linux-kernel - Re: [patch 3/3] tick: Annotate tick_do_timer

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Message-ID: <20201207120943.GS3021@hirez.programming.kicks-ass.net>
Date:   Mon, 7 Dec 2020 13:09:43 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Marco Elver <elver@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Will Deacon <will@...nel.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        syzbot+23a256029191772c2f02@...kaller.appspotmail.com,
        syzbot+56078ac0b9071335a745@...kaller.appspotmail.com,
        syzbot+867130cb240c41f15164@...kaller.appspotmail.com
Subject: Re: [patch 3/3] tick: Annotate tick_do_timer_cpu data races

On Sun, Dec 06, 2020 at 10:12:56PM +0100, Thomas Gleixner wrote:
> +		if (data_race(tick_do_timer_cpu) == TICK_DO_TIMER_BOOT) {

I prefer the form:

	if (data_race(tick_do_timer_cpu == TICK_DO_TIMER_BOOT)) {

But there doesn't yet seem to be sufficient data_race() usage in the
kernel to see which of the forms is preferred. Do we want to bike-shed
this now and document the outcome somewhere?