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Message-ID: <20101026154800.18c5cfe6@lxorguk.ukuu.org.uk>
Date:	Tue, 26 Oct 2010 15:48:00 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Elvis Dowson <elvis.dowson@....com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Luciano Coelho <luciano.coelho@...ia.com>
Subject: Re: #ifdef CONFIG_ checks not working

On Tue, 26 Oct 2010 18:28:22 +0400
Elvis Dowson <elvis.dowson@....com> wrote:

> Hi,
>        I just noticed that with the 2.6.36-rc8 kernel, the #ifdef checks aren't working. 

They seem to be working fine

> So for example, if I add the following code fragment in my omap3_beagle_init function, CONFIG_WL1271 doesn't get detected, even though in my .config file, CONFIG_WL1271=m.

You are checking for Y/N not for modular (check how other drivers check
for both)

> Would you happen to know why this is not working. This type of checks used to work with the 2.6.32 kernel versions.
> 
> #ifdef CONFIG_WL1271
>     printk(KERN_INFO "%s: CONFIG_WL1271 detected\n", __func__);
> #else
>     printk(KERN_INFO "%s: CONFIG_WL1271 not detected\n", __func__);
> #endif

The code looks wrong anyway - if you didn't compile it in then presumably
you *did* detect it but didn't have a driver ?

Alan
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