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

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Date:	Fri, 21 Sep 2007 00:17:21 -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 3/9] RCU: Preemptible RCU

[ 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 ;-)

-- Steve

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