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Date:   Fri, 12 Jun 2020 15:09:52 +0200
From:   Sebastian Andrzej Siewior <>
Cc:     LKML <>,
        linux-rt-users <>,
        Steven Rostedt <>,
        Thomas Gleixner <>,
        Carsten Emde <>,
        John Kacur <>, Daniel Wagner <>,
        Clark Williams <>,
        Pavel Machek <>
Subject: Re: [PATCH RT 3/4] tasklet: Fix UP case for tasklet CHAINED state

On 2020-06-11 13:10:16 [-0500], wrote:
> commit 62d0a2a30cd0 (tasklet: Address a race resulting in
> double-enqueue) addresses a problem that can result in a tasklet being
> enqueued on two cpus at the same time by combining the RUN flag with a
> new CHAINED flag, and relies on the combination to be present in order
> to zero it out, which can never happen on (!SMP and !PREEMPT_RT_FULL)
> because the RUN flag is SMP/PREEMPT_RT_FULL-only.
> So make sure the above commit is only applied for the SMP ||
> Fixes: 62d0a2a30cd0 ("tasklet: Address a race resulting in double-enqueue")
> Signed-off-by: Tom Zanussi <>
> Reported-by: Ramon Fried <>
> Tested-By: Ramon Fried <>

Acked-by: Sebastian Andrzej Siewior <>


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