linux-kernel - Re: [PATCH 3/3] tty: hvc_xen: hide xen_console

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Date:	Tue, 26 Jan 2016 12:25:47 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
CC:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	"Jiri Slaby" <jslaby@...e.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Julien Grall <julien.grall@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Wei Liu <wei.liu2@...rix.com>,
	"Jan Beulich" <JBeulich@...e.com>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] tty: hvc_xen: hide xen_console_remove when unused

On Mon, 25 Jan 2016, Boris Ostrovsky wrote:
> On 01/25/2016 04:54 PM, Arnd Bergmann wrote:
> > xencons_disconnect_backend() is only called from xen_console_remove(),
> 
> and also from xencons_probe()/xencons_resume(). But those two are also under
> the
> same ifdef.

Good point. Aside from this the patch is good.

 
> > which is conditionally compiled, so we get a harmless warning when
> > CONFIG_HVC_XEN_FRONTEND is unset:
> > 
> > hvc/hvc_xen.c:350:12: error: 'xen_console_remove' defined but not used
> > [-Werror=unused-function]
> > 
> > This moves the function down into the same #ifdef section to silence
> > the warning.
> > 
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > ---
> >   drivers/tty/hvc/hvc_xen.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
> > index fa816b7193b6..11725422dacb 100644
> > --- a/drivers/tty/hvc/hvc_xen.c
> > +++ b/drivers/tty/hvc/hvc_xen.c
> > @@ -323,6 +323,7 @@ void xen_console_resume(void)
> >   	}
> >   }
> >   +#ifdef CONFIG_HVC_XEN_FRONTEND
> >   static void xencons_disconnect_backend(struct xencons_info *info)
> >   {
> >   	if (info->irq > 0)
> > @@ -363,7 +364,6 @@ static int xen_console_remove(struct xencons_info *info)
> >   	return 0;
> >   }
> >   -#ifdef CONFIG_HVC_XEN_FRONTEND
> >   static int xencons_remove(struct xenbus_device *dev)
> >   {
> >   	return xen_console_remove(dev_get_drvdata(&dev->dev));
>