netdev - Re: [PATCH] kthread: Mark timer used by delayed kthread works as IRQ safe

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Date:   Wed, 19 Feb 2020 10:22:48 -0500
From:   Tejun Heo <tj@...nel.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        linux-rt-users@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        Richard Cochran <richardcochran@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kthread: Mark timer used by delayed kthread works as IRQ
 safe

On Mon, Feb 17, 2020 at 01:07:09PM +0100, Petr Mladek wrote:
> The timer used by delayed kthread works are IRQ safe because the used
> kthread_delayed_work_timer_fn() is IRQ safe.
> 
> It is properly marked when initialized by KTHREAD_DELAYED_WORK_INIT().
> But TIMER_IRQSAFE flag is missing when initialized by
> kthread_init_delayed_work().
> 
> The missing flag might trigger invalid warning from del_timer_sync()
> when kthread_mod_delayed_work() is called with interrupts disabled.
> 
> Reported-by: Grygorii Strashko <grygorii.strashko@...com>
> Signed-off-by: Petr Mladek <pmladek@...e.com>
> Tested-by: Grygorii Strashko <grygorii.strashko@...com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun