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

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Message-ID: <20150421205857.GG9455@htj.duckdns.org>
Date:	Tue, 21 Apr 2015 16:58:57 -0400
From:	Tejun Heo <tj@...nel.org>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	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,
	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

Hello, Luis.

On Tue, Apr 21, 2015 at 06:55:16PM +0200, Luis R. Rodriguez wrote:
> A use then would be for instance:
> 
> module_param_config_on_off(power_efficient, wq_power_efficient, 0444,
> 			   IS_ENABLED(CONFIG_WQ_POWER_EFFICIENT_DEFAULT));
> 
> this as an alternative would enable use of other static / global variables but
> I'm not sure if these are good use cases to promote, given that all this is to
> help with initial set up, so I believe the restrictions are for the better.

I was thinking more of cases where CONFIG should be inverted or
and/or'd.  In general I don't think we conventionally embed
IS_ENABLED() in this sort of macros.  It just jumps at me as a weird
restriction.  What do others think?

Thanks.

-- 
tejun
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