linux-kernel - Re: [PATCH tip/core/rcu 05/28] rcu: Move rcu

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Date:	Wed, 8 Jun 2011 19:26:21 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 05/28] rcu: Move rcu_head definition to
	types.h

* Paul E. McKenney (paulmck@...ux.vnet.ibm.com) wrote:
> Take a first step towards untangling Linux kernel header files by
> placing the struct rcu_head definition into include/linux/types.h.
> Once this is in place, then header files that need only rcu_head
> can include types.h rather than rcupdate.h.
> 
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Yes! I'm suddenly feeling the temperature drop by a few degrees in
#include hell ;) One detail though: I think rcupdate.h should then
include types.h.

Thanks,

Mathieu


> ---
>  include/linux/rcupdate.h |   10 +---------
>  include/linux/types.h    |   10 ++++++++++
>  2 files changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
> index 8be0433..ad09eb8 100644
> --- a/include/linux/rcupdate.h
> +++ b/include/linux/rcupdate.h
> @@ -64,15 +64,7 @@ static inline void rcutorture_record_progress(unsigned long vernum)
>  #define ULONG_CMP_GE(a, b)	(ULONG_MAX / 2 >= (a) - (b))
>  #define ULONG_CMP_LT(a, b)	(ULONG_MAX / 2 < (a) - (b))
>  
> -/**
> - * struct rcu_head - callback structure for use with RCU
> - * @next: next update requests in a list
> - * @func: actual update function to call after the grace period.
> - */
> -struct rcu_head {
> -	struct rcu_head *next;
> -	void (*func)(struct rcu_head *head);
> -};
> +#include <linux/types.h>
>  
>  /* Exported common interfaces */
>  extern void call_rcu_sched(struct rcu_head *head,
> diff --git a/include/linux/types.h b/include/linux/types.h
> index 176da8c..57a9723 100644
> --- a/include/linux/types.h
> +++ b/include/linux/types.h
> @@ -238,6 +238,16 @@ struct ustat {
>  	char			f_fpack[6];
>  };
>  
> +/**
> + * struct rcu_head - callback structure for use with RCU
> + * @next: next update requests in a list
> + * @func: actual update function to call after the grace period.
> + */
> +struct rcu_head {
> +	struct rcu_head *next;
> +	void (*func)(struct rcu_head *head);
> +};
> +
>  #endif	/* __KERNEL__ */
>  #endif /*  __ASSEMBLY__ */
>  #endif /* _LINUX_TYPES_H */
> -- 
> 1.7.3.2
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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