netdev - Re: [PATCH net-next] xen-netback: update ubuf_info initialization to anonymous union

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Date:   Mon, 28 Aug 2017 10:16:54 +0100
From:   Wei Liu <wei.liu2@...rix.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
CC:     <netdev@...r.kernel.org>, <davem@...emloft.net>,
        <wei.liu2@...rix.com>, <paul.durrant@...rix.com>,
        <kbuild-all@...org>, Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net-next] xen-netback: update ubuf_info initialization to
 anonymous union

On Fri, Aug 25, 2017 at 01:10:43PM -0400, Willem de Bruijn wrote:
> From: Willem de Bruijn <willemb@...gle.com>
> 
> The xen driver initializes struct ubuf_info fields using designated
> initializers. I recently moved these fields inside a nested anonymous
> struct inside an anonymous union. I had missed this use case.
> 
> This breaks compilation of xen-netback with older compilers.
> From kbuild bot with gcc-4.4.7:
> 
>    drivers/net//xen-netback/interface.c: In function
>    'xenvif_init_queue':
>    >> drivers/net//xen-netback/interface.c:554: error: unknown field 'ctx' specified in initializer
>    >> drivers/net//xen-netback/interface.c:554: warning: missing braces around initializer
>       drivers/net//xen-netback/interface.c:554: warning: (near initialization for '(anonymous).<anonymous>')
>    >> drivers/net//xen-netback/interface.c:554: warning: initialization makes integer from pointer without a cast
>    >> drivers/net//xen-netback/interface.c:555: error: unknown field 'desc' specified in initializer
> 
> Add double braces around the designated initializers to match their
> nested position in the struct. After this, compilation succeeds again.
> 
> Fixes: 4ab6c99d99bb ("sock: MSG_ZEROCOPY notification coalescing")
> Reported-by: kbuild bot <lpk@...el.com>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Acked-by: Wei Liu <wei.liu2@...rix.com>