linux-kernel - Re: [PATCH v5 tip/core/rcu 05/16] rcu: Export RCU-tasks APIs to GPL modules

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Message-ID: <20140814212907.GX4752@linux.vnet.ibm.com>
Date:	Thu, 14 Aug 2014 14:29:07 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Josh Triplett <josh@...htriplett.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Howells <dhowells@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>, dvhart@...ux.intel.com,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH v5 tip/core/rcu 05/16] rcu: Export RCU-tasks APIs to GPL
 modules

On Thu, Aug 14, 2014 at 03:08:06PM -0400, Pranith Kumar wrote:
> On Mon, Aug 11, 2014 at 6:48 PM, Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> 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.
> 
> Only two of these are being exported in this patch. Patch 1 is adding
> the export for call_rcu_tasks().

Good point, updated the commit log accordingly.

							Thanx, Paul

> > 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>
> > ---
> >  kernel/rcu/update.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
> > index 4cece6e886ee..8f53a41dd9ee 100644
> > --- a/kernel/rcu/update.c
> > +++ b/kernel/rcu/update.c
> > @@ -433,6 +433,7 @@ 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.
> > @@ -445,6 +446,7 @@ void rcu_barrier_tasks(void)
> >         /* There is only one callback queue, so this is easy.  ;-) */
> >         synchronize_rcu_tasks();
> >  }
> > +EXPORT_SYMBOL_GPL(rcu_barrier_tasks);
> >
> >  /* See if tasks are still holding out, complain if so. */
> >  static void check_holdout_task(struct task_struct *t)
> > --
> > 1.8.1.5
> >
> 
> 
> 
> -- 
> Pranith
> 

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