linux-kernel - Re: Kconfig, Makefile and ifdef: mod as yes vs. no?

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Message-ID: <20090711215343.GC31925@bombadil.infradead.org>
Date:	Sat, 11 Jul 2009 17:53:43 -0400
From:	Kyle McMartin <kyle@...artin.ca>
To:	Pekka Paalanen <pq@....fi>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Kconfig, Makefile and ifdef: mod as yes vs. no?

On Sun, Jul 12, 2009 at 12:06:25AM +0300, Pekka Paalanen wrote:
> +#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
>

You need to test _MODULE for the symbol too... since it's necessary to
be able to distinguish between symbols which exist in the vmlinux, and
symbols which require a module to be loaded.

#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) &&
	defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)

should work.

regards, Kyle
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