linux-kernel - Re: [PATCH 2/2] ras: close the race condition with timer

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Date:   Tue, 16 Apr 2019 19:42:59 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-edac@...r.kernel.org,
        Tony Luck <tony.luck@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/2] ras: close the race condition with timer

On Tue, Apr 16, 2019 at 10:09:49AM -0700, Cong Wang wrote:
> They are just locks requiring different contexts, I don't see how one is
> simpler than the other. Do you mind to be more specific?

Yes, I'd like for this whole CEC code to be lazy and preemptible as it
is not at all important when it does its work, as long as it gets it
done eventually.

Can't be preemptible with spinlocks.

> By workqueue, you must mean to say delayed work, right?
>
> But the global workqueue is not serialized either,

Serialized with what? Insertions?

That's what the mutex is for and the insertions happen in process
context.

So yeah, delayed_work sounds like what it should do. I.e.,
queue_delayed_work() and decay_interval_set() should do
mod_delayed_work(). Something along those lines, anyways.

Thx.

-- 
Regards/Gruss,
    Boris.

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