From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] net: define __packed for the userspace code
Date: Sun, 22 Aug 2010 19:36:09 -0700 (PDT)
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From: Changli Gao <xiaosuo@gmail.com>
Date: Mon, 23 Aug 2010 10:29:49 +0800

> Do you mean that use the __attribute__((packed)) annotation in all of
> these files:
> 
> localhost linux # grep "\<__packed\>" usr/include/ -r | uniq
> usr/include/linux/if_hippi.h:} __packed;
> usr/include/linux/if_fddi.h:} __packed;
> usr/include/linux/nbd.h:} __packed;
> usr/include/linux/ncp.h:} __packed;
> usr/include/linux/rfkill.h:} __packed;
> usr/include/linux/if_pppox.h:} __packed;
> usr/include/linux/phonet.h:} __packed;
> usr/include/linux/ipv6.h:} __packed;    /* required for some archs */
> usr/include/linux/ipv6.h:} __packed;
> usr/include/linux/if_ether.h:} __packed;

It seems so, yes.

There is no way that anybody has tried to compile anything in
userspace using these headers with the __packed usage there.

If they would, they would surely see a compile failure.