linux-kernel - Re: [PATCH RFC 1/9] RCU: Split API to permit multiple RCU implementations

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Date:	Fri, 21 Sep 2007 00:14:56 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
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 1/9] RCU: Split API to permit multiple RCU
	implementations

On Mon, Sep 10, 2007 at 11:32:08AM -0700, Paul E. McKenney wrote:

[nitpick and two part mail ]

> 
> diff -urpNa -X dontdiff linux-2.6.22/include/linux/rcuclassic.h linux-2.6.22-a-splitclassic/include/linux/rcuclassic.h
> --- linux-2.6.22/include/linux/rcuclassic.h	1969-12-31 16:00:00.000000000 -0800
> +++ linux-2.6.22-a-splitclassic/include/linux/rcuclassic.h	2007-08-22 14:42:23.000000000 -0700
> @@ -0,0 +1,149 @@

[snip]

> +		local_bh_enable(); \
> +	} while (0)
> +
> +#define __synchronize_sched() synchronize_rcu()
> +
> +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/include/linux/rcupdate.h linux-2.6.22-a-splitclassic/include/linux/rcupdate.h
> --- linux-2.6.22/include/linux/rcupdate.h	2007-07-08 16:32:17.000000000 -0700
> +++ linux-2.6.22-a-splitclassic/include/linux/rcupdate.h	2007-07-19 14:02:36.000000000 -0700

[snip]

>   */
> -#define synchronize_sched() synchronize_rcu()
> +#define synchronize_sched() __synchronize_sched()
>  
> -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);

Why is rcu_batches_completed and rcu_batches_completed_bh moved from
rcupdate.h to rcuclassic.h?

[ continued ...]

-- Steve

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