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Date:   Fri, 12 Jun 2020 21:25:20 +0200
From:   Thomas Gleixner <>
Cc:     LKML <>,,
        Andrew Lutomirski <>, X86 ML <>,
        Frederic Weisbecker <>,
        Steven Rostedt <>,
        Joel Fernandes <>,
        Mathieu Desnoyers <>,
        Will Deacon <>,
        Peter Zijlstra <>
Subject: Re: [PATCH x86/entry: Force rcu_irq_enter() when in idle task

"Paul E. McKenney" <> writes:
> On Fri, Jun 12, 2020 at 10:49:53AM -0700, Paul E. McKenney wrote:
>> I will therefore address this issue in a follow-on patch.
> I should add that -your- patch from yesterday did -not- cause this
> problem, in case that is of interest.

So I still can add it back and amend the changelog and comment:

Change the condition from !rcu_is_watching() to is_idle_task(current) ||
rcu_is_watching() which enforces that interrupts in the idle task
unconditionally invoke rcu_irq_enter() independent of the RCU state. For
most scenarios is_idle_task() would be sufficient but Task RCU needs it
according to Paul.



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