linux-kernel - Re: checkpatch false positive

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Date:	Wed, 17 Mar 2010 15:40:54 +0000
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Joe Perches <joe@...ches.com>
Cc:	Andy Whitcroft <apw@...onical.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: checkpatch false positive

On Wed, 2010-03-17 at 08:25 -0700, Joe Perches wrote:
> On Wed, 2010-03-17 at 11:00 +0000, Richard Kennedy wrote:
> > I'm getting this error from checkpatch which is a false positive AFAICT.
> > I don't see any other way to code this macro so maybe this rule
> > shouldn't apply?.
> > 
> > 	ERROR: space prohibited before open square bracket '['
> > 	#24: FILE: drivers/staging/wlan-ng/p80211wext.c:1685:
> > 	+#define IW_IOCTL(x) [(x)-SIOCSIWCOMMIT]
> 
> While true that this is a false positive, hiding array indexing
> brackets in a macro doesn't seem a good idea.
> 
> Maybe it'd be better to move the brackets to the use?
> 
> 
err maybe ;)

I copied it from driver/net/wireless/ipw2x00/ipw2200.c 

It just reduces typing when initialising the array :-

	#define IW_IOCTL(x) [(x)-SIOCSIWCOMMIT]
	static iw_handler p80211wext_handlers[] = {
		IW_IOCTL(SIOCSIWCOMMIT) = (iw_handler) p80211wext_siwcommit,
		...

Oh, having quickly looked at wireless.h, I see there is already a macro
IW_IOCTL_IDX so I guess I should have used that!

would something like this be better?

	static iw_handler p80211wext_handlers[] = {
		[IW_IOCTL_IDX(SIOCSIWCOMMIT)] = (iw_handler) p80211wext_siwcommit,
		...

regards
Richard


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