linux-kernel - Re: [PATCH 3/8] jump_label: introduce DEFINE_STATIC_KEY_{TRUE,FALSE}

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Date:	Fri, 21 Aug 2015 08:28:26 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Kevin Hao <haokexin@...il.com>
Cc:	Michael Ellerman <mpe@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 3/8] jump_label: introduce
 DEFINE_STATIC_KEY_{TRUE,FALSE}_ARRAY macros


* Kevin Hao <haokexin@...il.com> wrote:

> These are used to define a static_key_{true,false} array.
> 
> Signed-off-by: Kevin Hao <haokexin@...il.com>
> ---
>  include/linux/jump_label.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
> index 7f653e8f6690..5c1d6a49dd6b 100644
> --- a/include/linux/jump_label.h
> +++ b/include/linux/jump_label.h
> @@ -267,6 +267,12 @@ struct static_key_false {
>  #define DEFINE_STATIC_KEY_FALSE(name)	\
>  	struct static_key_false name = STATIC_KEY_FALSE_INIT
>  
> +#define DEFINE_STATIC_KEY_TRUE_ARRAY(name, n)	\
> +	struct static_key_true name[n] = { [0 ... n - 1] = STATIC_KEY_TRUE_INIT }
> +
> +#define DEFINE_STATIC_KEY_FALSE_ARRAY(name, n)	\
> +	struct static_key_false name[n] = { [0 ... n - 1] = STATIC_KEY_FALSE_INIT }

I think the define makes the code more obfuscated and less clear, the open-coded 
initialization is pretty dense and easy to read to begin with.

Thanks,

	Ingo
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