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From: Thomas Gleixner <tglx@linutronix.de>
To: paulmck@kernel.org, linux-kernel@vger.kernel.org, rcu@vger.kernel.org
Cc: luto@kernel.org, x86@kernel.org, frederic@kernel.org,
	rostedt@goodmis.org, joel@joelfernandes.org,
	mathieu.desnoyers@efficios.com, will@kernel.org,
	peterz@infradead.org
Subject: Re: [PATCH RFC] x86/entry: Ask RCU if it needs rcu_irq_{enter,exit}()
Date: Fri, 12 Jun 2020 11:27:21 +0200	[thread overview]
Message-ID: <87ftb0d47a.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20200611235305.GA32342@paulmck-ThinkPad-P72>

"Paul E. McKenney" <paulmck@kernel.org> writes:
> +static __always_inline bool rcu_needs_irq_enter(void)
> +{
> +	return !IS_ENABLED(CONFIG_TINY_RCU) &&
> +               (context_tracking_enabled_cpu(smp_processor_id()) || is_idle_task(current));

This reintroduces the #PF problem which started the whole conditional
RCU entry discussion:

   https://lore.kernel.org/lkml/20200515235125.628629605@linutronix.de/

and which made us all come to the conclusion that we can do it always
conditional. No biscuit for you. :)

Thanks,

        tglx

  parent reply	other threads:[~2020-06-12  9:27 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-11 23:53 [PATCH RFC] x86/entry: Ask RCU if it needs rcu_irq_{enter,exit}() Paul E. McKenney
2020-06-11 23:54 ` Paul E. McKenney
2020-06-12  5:30 ` Andy Lutomirski
2020-06-12 12:40   ` Thomas Gleixner
2020-06-12 13:55     ` [PATCH x86/entry: Force rcu_irq_enter() when in idle task Thomas Gleixner
2020-06-12 14:26       ` Frederic Weisbecker
2020-06-12 14:47         ` Thomas Gleixner
2020-06-12 15:32       ` Andy Lutomirski
2020-06-12 17:49       ` Paul E. McKenney
2020-06-12 19:19         ` Paul E. McKenney
2020-06-12 19:25           ` Thomas Gleixner
2020-06-12 19:28             ` Andy Lutomirski
2020-06-12 19:34             ` Thomas Gleixner
2020-06-12 21:56               ` Paul E. McKenney
2020-06-12 19:50       ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-06-15 20:16       ` [PATCH " Joel Fernandes
2020-06-16  8:40         ` Thomas Gleixner
2020-06-16 14:30           ` Joel Fernandes
2020-06-16 16:52             ` Andy Lutomirski
2020-06-12  9:27 ` Thomas Gleixner [this message]
2020-06-12 13:57   ` [PATCH RFC] x86/entry: Ask RCU if it needs rcu_irq_{enter,exit}() Paul E. McKenney

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