linux-kernel - Re: [PATCH v2] usb: g_ffs: fix compilation warning

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Date:	Fri, 04 Oct 2013 15:39:08 -0700
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	David Cohen <david.a.cohen@...ux.intel.com>
CC:	gregkh@...uxfoundation.org, balbi@...com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usb: g_ffs: fix compilation warning

Hi Greg,

On 10/04/2013 03:30 PM, David Cohen wrote:
> If USB_FUNCTIONFS is selected without USB_FUNCTIONFS_ETH and
> USB_FUNCTIONFS_RNIS, u_ether.h won't be included and then
> USB_ETHERNET_MODULE_PARAMAETERS macro won't be available causing the
> following warning compilation:
>
> drivers/usb/gadget/g_ffs.c:81:1: warning: data definition has no type or
> storage class [enabled by default]
> drivers/usb/gadget/g_ffs.c:81:1: warning: type defaults to ‘int’ in
> declaration of ‘USB_ETHERNET_MODULE_PARAMETERS’ [-Wimplicit-int]
> drivers/usb/gadget/g_ffs.c:81:1: warning: function declaration isn’t a
> prototype [-Wstrict-prototypes]
>
> This patch fixes the warning by making USB_ETHERNET_MODULE_PARAMETERS to
> be used iff u_ether.h is included, otherwise it is not needed.
>
> Signed-off-by: David Cohen <david.a.cohen@...ux.intel.com>
> ---
>   drivers/usb/gadget/g_ffs.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/usb/gadget/g_ffs.c b/drivers/usb/gadget/g_ffs.c
> index 5327c82..2344efe 100644
> --- a/drivers/usb/gadget/g_ffs.c
> +++ b/drivers/usb/gadget/g_ffs.c
> @@ -76,7 +76,9 @@ struct gfs_ffs_obj {
>
>   USB_GADGET_COMPOSITE_OPTIONS();
>
> +#if defined CONFIG_USB_FUNCTIONFS_ETH || defined CONFIG_USB_FUNCTIONFS_RNDIS
>   USB_ETHERNET_MODULE_PARAMETERS();

This warning happens on kernel v3.11+
But luckily it has no real effect on kernel despite the warning, so no 
tests would report it.

Br, David Cohen

> +#endif
>
>   static struct usb_device_descriptor gfs_dev_desc = {
>   	.bLength		= sizeof gfs_dev_desc,
>

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