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Date:	Fri, 19 Jan 2007 15:37:25 +0100
From:	Adrian Bunk <>
To:	Andrew Walrond <>
Cc:	LKML <>,
	Al Viro <>,
	"David S. Miller" <>,,
	David Woodhouse <>
Subject: Re: Kernel headers - linux-atm userspace build broken by recent change; __be16 undefined

On Thu, Jan 18, 2007 at 09:22:52PM +0000, Andrew Walrond wrote:
> Don't know exactly when this change went in, but it's not in 
> and is in
>  $ diff linux/include/linux/if_arp.h linux-2.6/include/linux/if_arp.h
> 133,134c133,134
> <       unsigned short  ar_hrd;         /* format of hardware address   */
> <       unsigned short  ar_pro;         /* format of protocol address   */
> ---
> >       __be16          ar_hrd;         /* format of hardware address   */
> >       __be16          ar_pro;         /* format of protocol address   */
> 137c137
> <       unsigned short  ar_op;          /* ARP opcode (command)         */
> ---
> >       __be16          ar_op;          /* ARP opcode (command)         */
> This causes the linux-atm userspace compile to fail like this:
> In file included from arp.c:19:
> /usr/include/linux/if_arp.h:133: error: expected 
> specifier-qualifier-list before '__be16'
> I guess if_arp.h needs to include include/linux/byteorder/big_endian.h?

No, linux/types.h

But what bothers me more about if_arp.h is that it is one of the
headers using "struct sockaddr" in userspace, but as far as I can see we 
aren't exporting it in any header.

This seems to work since glibc is providing the struct, but this looks 
a bit fishy.

> Andrew Walrond



       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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