Date: Sun, 3 Apr 2005 14:26:50 +0530
From: Dipankar Sarma <dipankar@in.ibm.com>
To: "Paul E. McKenney" <paulmck@us.ibm.com>
Cc: linux-kernel@vger.kernel.org, shemminger@osdl.org,
       manfred@colorfullife.com, bunk@stusta.de
Subject: Re: [RFC,PATCH 2/4] Deprecate synchronize_kernel, GPL replacement
Message-ID: <20050403085650.GA4563@in.ibm.com>
Reply-To: dipankar@in.ibm.com
References: <20050403062149.GA1656@us.ibm.com>
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On Sat, Apr 02, 2005 at 10:21:50PM -0800, Paul E. McKenney wrote:
> The synchronize_kernel() primitive is used for quite a few different
> purposes: waiting for RCU readers, waiting for NMIs, waiting for interrupts,
> and so on.  This makes RCU code harder to read, since synchronize_kernel()
> might or might not have matching rcu_read_lock()s.  This patch creates
> a new synchronize_rcu() that is to be used for RCU readers and a new
> synchronize_sched() that is used for the rest.  These two new primitives
> currently have the same implementation, but this is might well change
> with additional real-time support.  Both new primitives are GPL-only,
> the old primitive is deprecated.
> 
> Signed-off-by: <paulmck@us.ibm.com>
> ---
> Depends on earlier "Add deprecated_for_modules" patch.
> 
> +/*
> + * Deprecated, use synchronize_rcu() or synchronize_sched() instead.
> + */
> +void synchronize_kernel(void)
> +{
> +	synchronize_rcu();
> +}
> +

We should probably mark it deprecated - 

void __deprecated synchronize_kernel(void)
{
	synchronize_rcu();
}

Thanks
Dipankar
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