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

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Date:	Mon, 25 Jan 2016 18:05:38 -0500
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	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 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.

-boris

> 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));