linux-kernel - Re: [PATCH -tip] nubus.h: extern's make no sense in userspace

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Date:	Wed, 14 Jan 2009 12:04:21 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc:	Jaswinder Singh Rajput <jaswinder@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, sam@...nborg.org,
	gorcunov@...il.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] nubus.h: extern's make no sense in userspace

On Tue, 2009-01-13 at 10:03 +0100, Geert Uytterhoeven wrote:
> On Tue, 13 Jan 2009, Jaswinder Singh Rajput wrote:
> > Impact: cleanup, Impact: fix 3 make headers_check warnings:
> > 
> > usr/include/linux/nubus.h:298: extern's make no sense in userspace
> > usr/include/linux/nubus.h:300: extern's make no sense in userspace
> > usr/include/linux/nubus.h:304: extern's make no sense in userspace
> > 
> > Also moved nubus_scan_bus() in __KERNEL__
> > 
> > Also removed obsolete get_nubus_list()
> > 
> > Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> > ---
> >  include/linux/nubus.h |    3 ++-
> >  1 files changed, 2 insertions(+), 1 deletions(-)
> > 
> > diff --git a/include/linux/nubus.h b/include/linux/nubus.h
> > index bd31554..9f54a23 100644
> > --- a/include/linux/nubus.h
> > +++ b/include/linux/nubus.h
> > @@ -297,6 +297,7 @@ struct nubus_dev {
> >  	struct nubus_board* board;
> >  };
> >  
> > +#ifdef __KERNEL__
> >  /* This is all NuBus devices (used to find devices later on) */
> >  extern struct nubus_dev* nubus_devices;
> >  /* This is all NuBus cards */
> > @@ -305,7 +306,7 @@ extern struct nubus_board* nubus_boards;
> >  /* Generic NuBus interface functions, modelled after the PCI interface */
> >  void nubus_scan_bus(void);
> >  extern void nubus_proc_init(void);
> > -int get_nubus_list(char *buf);
> > +#endif /* __KERNEL__ */
> >  int nubus_proc_attach_device(struct nubus_dev *dev);
>    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >  int nubus_proc_detach_device(struct nubus_dev *dev);
>    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >  /* If we need more precision we can add some more of these */
> 
> What about these? They (unfortunately) lack the "extern" keyword, but they're
> still external declarations, and "make headers_check' doesn't notice them?
> 
> BTW, is there a way to tell gcc to warn about externs not marked "extern", so
> we can fix all of them?

I had a look at this file, there's the small patch that just wraps the whole
section of function declarations with ifdef __KERNEL, or the larger patch
that does the wrapping _and_ adds the missing externs to make it obvious.

But I'm not sure that there is agreement regarding adding the externs too.

What do people think?

Harvey

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