linux-kernel - Re: [PATCH] GPIO: #include <linux/kernel.h> for might

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Date:	Tue, 15 Apr 2008 09:36:41 +0200
From:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
To:	David Brownell <david-b@...bell.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] GPIO: #include <linux/kernel.h> for might_sleep

Hello David,

David Brownell wrote:
> On Friday 11 April 2008, Uwe Kleine-König wrote:
> > I like having headers being independend of the order of inclusion.
> 
> That's a pretty unusual policy.  Not one that's generally
> followed in the kernel, either ... 
It's usual for the system headers.  IIRC I read that in the SUSV3 spec,
but I cannot find it at the moment.
 
> > Usually I order all includes alphabetically (and grouped by linux/,
> > asm/, etc.). 
> 
> If you like alphabetical, why the exception for <asm/...> ??
> :)
> 
> > This doesn't work with gpio.h because then kernel.h is 
> > included to late.
> 
> So include <linux/kernel.h> first.  There *is* a policy
> of avoiding extra #includes ... extras slow down builds.
Is it really a slow down if you need <linux/kernel.h> unconditionally?
I thought it's fine to skip #include <header2.h> in header1.h if not all
users of header1.h need header2.h.

If I try to compile a C file that only consists of an include for
<asm-generic/gpio.h> I get the error:

	In file included from ...:
	include/asm-generic/gpio.h:63: error: expected specifier-qualifier-list before ‘u16’
	include/asm-generic/gpio.h:72: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘gpiochip_remove’

Best regards
Uwe

-- 
Uwe Kleine-König, Software Engineer
Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany
Tax: 315/5781/0242 / VAT: DE153662976 / Reg. Amtsgericht Dortmund HRB 13962
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