linux-kernel - Re: [Patch] Shut up warnings from files under drivers/

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Date:	Sat, 26 Jan 2008 20:30:36 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	WANG Cong <xiyou.wangcong@...il.com>, Greg KH <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [Patch] Shut up warnings from files under drivers/

> I checked up on the synclink.c warning.
> We have the following code:
> 
> static void synclink_remove_one (struct pci_dev *dev);
> 
> ...
> 
> static struct pci_driver synclink_pci_driver = {
>         .remove         = __devexit_p(synclink_remove_one),
> };
> 
> ...
> 
> static void __devexit synclink_remove_one (struct pci_dev *dev)
> {
> }
> 
> And I double checked the preprocessed source to check
> that we applied the __attribute__((__used__)) to the function.
> 
> Investigating a bit more I realized that gcc looses the
> __used__ attribution due to the prototype.
> So there are two correct fixes:
> a) move the function up so we do not need the forward
>    declaration
> b) add a __devexit to the forward decalration too.
> 
> I strongly prefer the first version and this is the
> correct fix for these cases.
> 
> Do we have a gcc bug here - I did not see a definitive answer in gcc docs?

I have reported it now - follow:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34985

	Sam
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