linux-kernel - Re: [PATCH v2 tip/core/rcu 04/10] rcu: Export RCU-tasks APIs to GPL modules

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Message-ID: <20140731165620.GC12697@cloud>
Date:	Thu, 31 Jul 2014 09:56:20 -0700
From:	josh@...htriplett.org
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
	fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com
Subject: Re: [PATCH v2 tip/core/rcu 04/10] rcu: Export RCU-tasks APIs to
 GPL modules

On Wed, Jul 30, 2014 at 05:39:36PM -0700, Paul E. McKenney wrote:
> From: Steven Rostedt <rostedt@...dmis.org>
> 
> This commit exports the RCU-tasks APIs, call_rcu_tasks(),
> synchronize_rcu_tasks(), and rcu_barrier_tasks(), to GPL-licensed
> kernel modules.
> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Reviewed-by: Josh Triplett <josh@...htriplett.org>

Should this remain a separate patch, or go into the patch that creates
these APIs?

>  kernel/rcu/update.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
> index c8d304dc6d8a..1bfc07ed854e 100644
> --- a/kernel/rcu/update.c
> +++ b/kernel/rcu/update.c
> @@ -429,6 +429,7 @@ void synchronize_rcu_tasks(void)
>  	/* Wait for the grace period. */
>  	wait_rcu_gp(call_rcu_tasks);
>  }
> +EXPORT_SYMBOL_GPL(synchronize_rcu_tasks);
>  
>  /**
>   * rcu_barrier_tasks - Wait for in-flight call_rcu_tasks() callbacks.
> @@ -441,6 +442,7 @@ void rcu_barrier_tasks(void)
>  	/* There is only one callback queue, so this is easy.  ;-) */
>  	synchronize_rcu_tasks();
>  }
> +EXPORT_SYMBOL_GPL(rcu_barrier_tasks);
>  
>  /* RCU-tasks kthread that detects grace periods and invokes callbacks. */
>  static int __noreturn rcu_tasks_kthread(void *arg)
> -- 
> 1.8.1.5
> 
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