linux-kernel - Re: [PATCH RFC 3/9] RCU: Preemptible RCU

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Message-ID: <20070921055056.GA8654@linux.vnet.ibm.com>
Date:	Thu, 20 Sep 2007 22:50:56 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	mingo@...e.hu, akpm@...ux-foundation.org, dipankar@...ibm.com,
	josht@...ux.vnet.ibm.com, tytso@...ibm.com, dvhltc@...ibm.com,
	tglx@...utronix.de, a.p.zijlstra@...llo.nl, bunk@...nel.org,
	ego@...ibm.com, oleg@...sign.ru, srostedt@...hat.com
Subject: Re: [PATCH RFC 3/9] RCU: Preemptible RCU

On Fri, Sep 21, 2007 at 12:17:21AM -0400, Steven Rostedt wrote:
> [ continued here from comment on patch 1]
> 
> On Mon, Sep 10, 2007 at 11:34:12AM -0700, Paul E. McKenney wrote:
> >  /* softirq mask and active fields moved to irq_cpustat_t in
> > diff -urpNa -X dontdiff linux-2.6.22-b-fixbarriers/include/linux/rcuclassic.h linux-2.6.22-c-preemptrcu/include/linux/rcuclassic.h
> > --- linux-2.6.22-b-fixbarriers/include/linux/rcuclassic.h	2007-08-22 14:42:23.000000000 -0700
> > +++ linux-2.6.22-c-preemptrcu/include/linux/rcuclassic.h	2007-08-22 15:21:06.000000000 -0700
> > @@ -142,8 +142,6 @@ extern int rcu_needs_cpu(int cpu);
> >  extern void __rcu_init(void);
> >  extern void rcu_check_callbacks(int cpu, int user);
> >  extern void rcu_restart_cpu(int cpu);
> > -extern long rcu_batches_completed(void);
> > -extern long rcu_batches_completed_bh(void);
> >  
> >  #endif /* __KERNEL__ */
> >  #endif /* __LINUX_RCUCLASSIC_H */
> > diff -urpNa -X dontdiff linux-2.6.22-b-fixbarriers/include/linux/rcupdate.h linux-2.6.22-c-preemptrcu/include/linux/rcupdate.h
> > --- linux-2.6.22-b-fixbarriers/include/linux/rcupdate.h	2007-07-19 14:02:36.000000000 -0700
> > +++ linux-2.6.22-c-preemptrcu/include/linux/rcupdate.h	2007-08-22 15:21:06.000000000 -0700
> > @@ -52,7 +52,11 @@ struct rcu_head {
> >  	void (*func)(struct rcu_head *head);
> >  };
> >  
> > +#ifdef CONFIG_CLASSIC_RCU
> >  #include <linux/rcuclassic.h>
> > +#else /* #ifdef CONFIG_CLASSIC_RCU */
> > +#include <linux/rcupreempt.h>
> > +#endif /* #else #ifdef CONFIG_CLASSIC_RCU */
> >  
> >  #define RCU_HEAD_INIT 	{ .next = NULL, .func = NULL }
> >  #define RCU_HEAD(head) struct rcu_head head = RCU_HEAD_INIT
> > @@ -218,10 +222,13 @@ extern void FASTCALL(call_rcu_bh(struct 
> >  /* Exported common interfaces */
> >  extern void synchronize_rcu(void);
> >  extern void rcu_barrier(void);
> > +extern long rcu_batches_completed(void);
> > +extern long rcu_batches_completed_bh(void);
> >
> 
> And here we put back rcu_batches_completed and rcu_batches_completed_bh
> from rcuclassic.h to rcupdate.h ;-)

Hmmm...  Good point!!!  I guess it would be OK to just leave them
in rcupdate.h throughout.  ;-)

Will fix.  And good eyes!

						Thanx, Paul
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