linux-kernel - Re: [PATCH RT] convert RCU Preempt tasklet into softirq.

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Date:	Fri, 08 Jun 2007 11:27:08 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	john stultz <johnstul@...ibm.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...sign.ru>,
	LKML <linux-kernel@...r.kernel.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	RT <linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH RT] convert RCU Preempt tasklet into softirq.

On Thu, 2007-06-07 at 14:02 -0700, Paul E. McKenney wrote:

> Some nits below.
> 
> 						Thanx, Paul
> 
> > Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> > 
> > Index: linux-2.6.21-rt9/include/linux/rcupreempt.h
> > ===================================================================
> > --- linux-2.6.21-rt9.orig/include/linux/rcupreempt.h
> > +++ linux-2.6.21-rt9/include/linux/rcupreempt.h
> > @@ -63,7 +63,9 @@ extern void rcu_check_callbacks(int cpu,
> >  extern void rcu_restart_cpu(int cpu);
> >  extern long rcu_batches_completed(void);
> > 
> > -extern void rcu_process_callbacks(unsigned long unused);
> > +struct softirq_action;
> > +
> > +extern void rcu_process_callbacks(struct softirq_action *unused);
> 
> I don't understand why the above is needed -- interrupt.h is included,
> and the use of rcu_process_callbacks() follows the definition.
> 
> >  #endif /* __KERNEL__ */
> >  #endif /* __LINUX_RCUPREEMPT_H */

The first time I compiled it, I forgot the ';' and got a warning there.
But the warning also included "declaring structure softirq_action in
prototype", so I fixed both the ';' and added the struct. I can try
compile without it. But I also know that adding #include <interrupt.h>
in rcupreempt.h caused issues too.

-- Steve

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