From: Michael Ellerman <michael@ellerman.id.au>
Reply-To: michael@ellerman.id.au
Organization: IBM LTC
To: Linux Kernel list <linux-kernel@vger.kernel.org>, paulmck@us.ibm.com
Subject: Re: [RFC,PATCH 2/4] Deprecate synchronize_kernel, GPL replacement
Date: Mon, 4 Apr 2005 00:11:56 +1000
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Hi Paul,

I'm not quite clear on the difference between the two synchronize functions=
 ,=20
the comment for synchronize_sched() seems to have a bit missing? (see below)

cheers

On Sun, 3 Apr 2005 16:21, Paul E. McKenney wrote:
> +/**
> + * synchronize_sched - block until all CPUs have exited any non-preempti=
ve
> + * kernel code sequences.
> + *
> + * This means that all preempt_disable code sequences, including NMI and
> + * hardware-interrupt handlers, in progress on entry will have completed
> + * before this primitive returns.  However, this does not guarantee that
> + * softirq handlers will have completed, since in some kernels

??

> + *
> + * This primitive provides the guarantees made by the (deprecated)
> + * synchronize_kernel() API.  In contrast, synchronize_rcu() only
> + * guarantees that rcu_read_lock() sections will have completed.
> + */
> +#define synchronize_sched() synchronize_rcu()

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