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Date: Sat, 26 Jan 2008 06:44:48 -0500
From: Jeff Garzik <jeff@garzik.org>
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To: WANG Cong <xiyou.wangcong@gmail.com>
CC: Greg KH <gregkh@suse.de>, LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@osdl.org>
Subject: Re: [Patch] Shut up warnings from files under drivers/
References: <20080126093007.GB20935@hacking> <479B03AE.3090600@garzik.org> <20080126101835.GD20935@hacking>
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WANG Cong wrote:
> For example, the defination of __devexit_p:
> 
> #if defined(MODULE) || defined(CONFIG_HOTPLUG)
> #define __devexit_p(x) x
> #else
> #define __devexit_p(x) NULL
> #endif
> 
> If !(defined(MODULE) || defined(CONFIG_HOTPLUG)), __devexit_p
> is just a NULL pointer, thus 'x' may be unused although defined.


  ...and that's the purpose of the __devexit marker on the code itself.

	Jeff