linux-kernel - Re: [PATCHv6 1/3] tun: export underlying socket

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Message-ID: <20091104190523.GA772@redhat.com>
Date:	Wed, 4 Nov 2009 21:05:23 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mingo@...e.hu,
	linux-mm@...ck.org, akpm@...ux-foundation.org, hpa@...or.com,
	gregory.haskins@...il.com, Rusty Russell <rusty@...tcorp.com.au>,
	s.hetze@...ux-ag.com
Subject: Re: [PATCHv6 1/3] tun: export underlying socket

On Wed, Nov 04, 2009 at 07:09:05PM +0100, Arnd Bergmann wrote:
> On Tuesday 03 November 2009, Arnd Bergmann wrote:
> > > index 3f5fd52..404abe0 100644
> > > --- a/include/linux/if_tun.h
> > > +++ b/include/linux/if_tun.h
> > > @@ -86,4 +86,18 @@ struct tun_filter {
> > >         __u8   addr[0][ETH_ALEN];
> > >  };
> > >  
> > > +#ifdef __KERNEL__
> > > +#if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
> > > +struct socket *tun_get_socket(struct file *);
> > > +#else
> > > +#include <linux/err.h>
> > > +#include <linux/errno.h>
> > > +struct file;
> > > +struct socket;
> > > +static inline struct socket *tun_get_socket(struct file *f)
> > > +{
> > > +       return ERR_PTR(-EINVAL);
> > > +}
> > > +#endif /* CONFIG_TUN */
> > > +#endif /* __KERNEL__ */
> > >  #endif /* __IF_TUN_H */
> > 
> > Is this a leftover from testing? Exporting the function for !__KERNEL__
> > seems pointless.
> > 
> 
> Michael, you didn't reply on this comment and the code is still there in v8.
> Do you actually need this? What for?
> 
> 	Arnd <><

Sorry, missed the question. If you look closely it is not exported for
!__KERNEL__ at all.  The stub is for when CONFIG_TUN is undefined.
Maybe I'll add a comment near #else, even though this is a bit strange
since the #if is just 2 lines above it.

-- 
MST
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