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

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Message-ID: <20150421152136.GC9455@htj.duckdns.org>
Date:	Tue, 21 Apr 2015 11:21:36 -0400
From:	Tejun Heo <tj@...nel.org>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	rusty@...tcorp.com.au, 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>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v1 4/6] moduleparam.h: add module_param_config_*() helpers

On Mon, Apr 20, 2015 at 04:30:35PM -0700, Luis R. Rodriguez wrote:
>  /**
> + * module_param_config_on_off - bool parameter with run time override
> + * @name: a valid C identifier which is the parameter name.
> + * @value: the actual lvalue to alter.
> + * @perm: visibility in sysfs.
> + * @config: kernel parameter which will enable this option if this
> + * 	kernel configuration option has been enabled.
> + *
> + * This lets you define a bool module paramter which by default will be
> + * set to true if the config option has been set on your kernel's
> + * configuration, otherwise it is set to false.
> + */
> +#define module_param_config_on_off(name, var, perm, config) 		\
> +	static bool var = IS_ENABLED(config);				\
> +	module_param_named(name, var, bool, perm);

Maybe we want to make @config just a boolean initializer?
e.g. something like

#define module_param_config_on_off(name, var, perm, on_off) 		\
	static bool var = on_off;					\
	module_param_named(name, var, bool, perm);

so that the caller does IS_ENABLED() or whatever that's necessary?  It
just seems a bit too restricted.

Thanks.

-- 
tejun
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