linux-kernel - Re: [PATCH v1 4/6] moduleparam.h: add module_param_config

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Date:	Wed, 22 Apr 2015 16:45:04 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	keescook@...omium.org, casey@...aufler-ca.com,
	cocci@...teme.lip6.fr, "Luis R. Rodriguez" <mcgrof@...e.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Hannes Reinecke <hare@...e.de>, Tejun Heo <tj@...nel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v1 4/6] moduleparam.h: add module_param_config_*() helpers

"Luis R. Rodriguez" <mcgrof@...not-panic.com> writes:
> From: "Luis R. Rodriguez" <mcgrof@...e.com>
>
> This adds a couple of bool module_param_config_*() helpers
> which are designed to let us easily associate a booloean
> module parameter with an associated kernel configuration
> option, and to help us remove #ifdef'ery eyesores.

But they don't.  And I had to read the descriptions twice to understand
what you're doing.

eg you use it like this:

 -#ifdef CONFIG_WQ_POWER_EFFICIENT_DEFAULT
 -static bool wq_power_efficient = true;
 -#else
 -static bool wq_power_efficient;
 -#endif
 -
 -module_param_named(power_efficient, wq_power_efficient, bool, 0444);
 +module_param_config_on_off(power_efficient, wq_power_efficient, 0444,
 CONFIG_WQ_POWER_EFFICIENT_DEFAULT);

It would be much clearer to do this:

 -#ifdef CONFIG_WQ_POWER_EFFICIENT_DEFAULT
 -static bool wq_power_efficient = true;
 -#else
 -static bool wq_power_efficient;
 -#endif
 +static bool wq_power_efficient = IS_ENABLED(CONFIG_WQ_POWER_EFFICIENT_DEFAULT);

I know exactly what that does without having to notice the difference
between module_param_config_on_off() and module_param_config_on().

Cheers,
Rusty.
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