linux-kernel - Re: [PATCH 24/35] mfd: ab8500: Remove unnecessary 'struct device' declaration

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Message-Id: <201302251627.29072.arnd@arndb.de>
Date:	Mon, 25 Feb 2013 16:27:28 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	sameo@...ux.intel.com, linus.walleij@...ricsson.com
Subject: Re: [PATCH 24/35] mfd: ab8500: Remove unnecessary 'struct device' declaration

On Monday 25 February 2013, Lee Jones wrote:
> > and others that use 'struct device'. C99 requires that a struct is declared
> > in advance  before you use it in a function declaration.
> 
> Hmm... I wonder why it doesn't complain then?
> 
> I'll remove the patch.

It's only a problem if the file is included before any other header declares
'struct device'. It may well be that this currently never happens, but it's
better to be safe and have a header that can be included in any order:
relying on a specific inclusion order can easily break with 'make randconfig'
turning off specific features that you did not know you relied on.

	Arnd
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