linux-kernel - Re: [PATCH] v2 Teach RCU that idle task is not quiscent state at boot

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Message-Id: <200902241502.57833.nickpiggin@yahoo.com.au>
Date:	Tue, 24 Feb 2009 15:02:56 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	paulmck@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, vegard.nossum@...il.com,
	mingo@...e.hu, stable@...nel.org, akpm@...ux-foundation.org,
	npiggin@...e.de, penberg@...helsinki.fi
Subject: Re: [PATCH] v2 Teach RCU that idle task is not quiscent state at boot

On Tuesday 24 February 2009 07:43:32 Paul E. McKenney wrote:

> @@ -80,6 +81,10 @@ void wakeme_after_rcu(struct rcu_head  *head)
>  void synchronize_rcu(void)
>  {
>  	struct rcu_synchronize rcu;
> +
> +	if (num_online_cpus() == 1)
> +		return;  /* If UP, synchronize_rcu() is a grace period! */
> +

Nice patch... May I just suggest a comment to say that this is
also a correctness requirement due to the grace period holdoff
for early boot?

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