linux-kernel - Re: [PATCH] rcu: remove needless struct notifier

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Message-ID: <20100329044405.GC2343@linux.vnet.ibm.com>
Date:	Sun, 28 Mar 2010 21:44:05 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rcu: remove needless struct notifier_block
 predeclaration

On Mon, Mar 29, 2010 at 10:33:38AM +0800, Lai Jiangshan wrote:
> 
> cleanup: remove needless struct notifier_block predeclaration 

Good catch!

These forward declarations used to be essential.  ;-)

If they have been made available on purpose, I am all for applying
this patch.  But if their appearance is accidental, perhaps to
disappear again in the next release, I would keep the forward
declarations.

Could you please check?

						Thanx, Paul

> diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
> index a519587..ae7b05e 100644
> --- a/include/linux/rcutiny.h
> +++ b/include/linux/rcutiny.h
> @@ -86,8 +86,6 @@ static inline void synchronize_rcu_bh_expedited(void)
>  	synchronize_sched();
>  }
> 
> -struct notifier_block;
> -
>  #ifdef CONFIG_NO_HZ
> 
>  extern void rcu_enter_nohz(void);
> diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
> index 42cc3a0..3be62e1 100644
> --- a/include/linux/rcutree.h
> +++ b/include/linux/rcutree.h
> @@ -30,8 +30,6 @@
>  #ifndef __LINUX_RCUTREE_H
>  #define __LINUX_RCUTREE_H
> 
> -struct notifier_block;
> -
>  extern void rcu_sched_qs(int cpu);
>  extern void rcu_bh_qs(int cpu);
>  extern int rcu_needs_cpu(int cpu);
> --
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