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Date:   Wed, 4 Mar 2020 06:24:51 -0500
From:   Qian Cai <>
To:     Peter Zijlstra <>
Cc:     Thomas Gleixner <>,,,,
Subject: Re: [PATCH] tick/sched: fix data races at tick_do_timer_cpu

> On Mar 4, 2020, at 4:56 AM, Peter Zijlstra <> wrote:
> Worse:
> +    if (cpu != READ_ONCE(tick_do_timer_cpu) &&
> +        (READ_ONCE(tick_do_timer_cpu) != TICK_DO_TIMER_NONE ||
> Doing that read twice is just utterly stupid. And the patch is full of
> that :/
> Please stop this non-thinking 'fix' generation!

That is an oversight that could easily be fixed. However, blaming about “non-thinking” is rather harsh. Do you know I had spent weeks reading about memory-model.txt and alike just to get better at it?

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