linux-kernel - Re: [PATCH] headers_check.pl: disallow extern's

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Date:	Fri, 2 Jan 2009 16:05:25 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Mike Frysinger <vapier@...too.org>,
	Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] headers_check.pl: disallow extern's

On Sat, 3 Jan 2009 00:59:18 +0100
Arnd Bergmann <arnd@...db.de> wrote:

> On Wednesday 31 December 2008, Mike Frysinger wrote:
> > On Wednesday 31 December 2008 11:58:03 Arnd Bergmann wrote:
> >
> > > Not sure if we can detect the other form reliably from perl.
> > 
> > yes, i already mentioned both of these issues.  that's why i
> > suggested we start adding "extern" to all the headers (or at least
> > the userspace ones).
> 
> The general trend seems to be to remove the "extern" keyword from
> kernel headers, because it is not interpreted, just like the 'auto'
> keyword. In fact, only few of them currently carry the extern keyword:
> 
> $ ctags -f- -R --c-kinds=p obj/usr/include/  | grep extern | wc -l
> 33
> 
> $ ctags -f- -R --c-kinds=p obj/usr/include/  | grep -v extern | wc -l
> 191
> 
> Note that this is a completely separate issue from extern variable
> declarations, which should to be disallowed in any case, and are easy
> to detect as they always require the extern keyword.

in addition... what business does the kernel have to provide function
prototypes to userspace, other than the system call prototypes?


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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