linux-kernel - Re: [PATCH 2/2] random: spread out jitter callback to different CPUs

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Message-ID: <Yz3yQzaNUcdIuUMX@zx2c4.com>
Date:   Wed, 5 Oct 2022 23:08:19 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Sultan Alsawaf <sultan@...neltoast.com>
Subject: Re: [PATCH 2/2] random: spread out jitter callback to different CPUs

Hi Sebastian,

On Wed, Oct 05, 2022 at 07:26:42PM +0200, Sebastian Andrzej Siewior wrote:
> That del_timer_sync() at the end is what you want. If the timer is
> pending (as in enqueued in the timer wheel) then it will be removed
> before it is invoked. If the timer's callback is invoked then it will
> spin until the callback is done.

del_timer_sync() is not guaranteed to succeed with add_timer_on() being
used in conjunction with timer_pending() though. That's why I've
abandoned this.

Jason