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Date:   Thu, 28 May 2020 08:33:03 +0800
From:   Lai Jiangshan <>
To:     Sebastian Andrzej Siewior <>
Cc:     LKML <>, Tejun Heo <>,
        Peter Zijlstra <>,
        Thomas Gleixner <>,
        Ingo Molnar <>,
        Linus Torvalds <>
Subject: Re: [PATCH v2 2/2] workqueue: Convert the pool::lock and
 wq_mayday_lock to raw_spinlock_t

On Thu, May 28, 2020 at 3:47 AM Sebastian Andrzej Siewior
<> wrote:
> The workqueue code has it's internal spinlocks (pool::lock), which
> are acquired on most workqueue operations. These spinlocks are
> converted to 'sleeping' spinlocks on a RT-kernel.
> Workqueue functions can be invoked from contexts which are truly atomic
> even on a PREEMPT_RT enabled kernel. Taking sleeping locks from such
> contexts is forbidden.
> The pool::lock hold times are bound and the code sections are
> relatively short, which allows to convert pool::lock and as a
> consequence wq_mayday_lock to raw spinlocks which are truly spinning
> locks even on a PREEMPT_RT kernel.
> With the previous conversion of the manager waitqueue to a simple
> waitqueue workqueues are now fully RT compliant.
> Signed-off-by: Sebastian Andrzej Siewior <>
> ---
>  kernel/workqueue.c | 176 ++++++++++++++++++++++-----------------------
>  1 file changed, 88 insertions(+), 88 deletions(-)

Reviewed-by: Lai Jiangshan <>

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