linux-kernel - Re: [PATCH 1/3] kernel/srcu: merge common code into a macro

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Date:	Fri, 05 Apr 2013 15:21:27 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: [PATCH 1/3] kernel/srcu: merge common code into a macro


On 03/19/2013 10:16 PM, Sebastian Andrzej Siewior wrote:
> DEFINE_SRCU() and DEFINE_STATIC_SRCU() does the same thing except for
> the "static" attribute. This patch moves the common pieces into
> _DEFINE_SRCU() which is used by the the former macros either adding the
> static attribute or not.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  include/linux/srcu.h |   10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)

Hi, Sebastian

The patch hurts readability.
The original code are simple enough, merging them as one macro
gives us no benefit.

Thanks
Lai.


> 
> diff --git a/include/linux/srcu.h b/include/linux/srcu.h
> index 6eb691b..d04acb8 100644
> --- a/include/linux/srcu.h
> +++ b/include/linux/srcu.h
> @@ -102,13 +102,13 @@ void process_srcu(struct work_struct *work);
>   * define and init a srcu struct at build time.
>   * dont't call init_srcu_struct() nor cleanup_srcu_struct() on it.
>   */
> -#define DEFINE_SRCU(name)						\
> +#define _DEFINE_SRCU(name, mod)						\
>  	static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\
> -	struct srcu_struct name = __SRCU_STRUCT_INIT(name);
> +	mod struct srcu_struct name =					\
> +				__SRCU_STRUCT_INIT(name);
>  
> -#define DEFINE_STATIC_SRCU(name)					\
> -	static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\
> -	static struct srcu_struct name = __SRCU_STRUCT_INIT(name);
> +#define DEFINE_SRCU(name)		_DEFINE_SRCU(name, )
> +#define DEFINE_STATIC_SRCU(name)	_DEFINE_SRCU(name, static)
>  
>  /**
>   * call_srcu() - Queue a callback for invocation after an SRCU grace period

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