From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-2.6] Revert "net: Support inclusion of
 <linux/socket.h> before <sys/socket.h>"
Date: Wed, 11 Nov 2009 19:09:24 -0800 (PST)
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From: Ben Hutchings <ben@decadent.org.uk>
Date: Thu, 12 Nov 2009 03:05:15 +0000

> <linux/netlink.h> will not compile for userland, because
> <linux/socket.h> is no longer defining sa_family_t.  For userland, this
> should be defined by <sys/socket.h>.

Still, you still essentially have two choices:

1) Tell userland, sorry you need to include sys/socket.h before
   other "socket stuff" and that means linux/netlink.h in
   particular

2) Put a !__KERNEL__ sys/socket.h include in there, but that's
   asking for trouble.

Ok?