On Thu, May 02, 2013 at 04:16:25AM -0400, David Miller wrote:
> From: Patrick McHardy <kaber@trash.net>
> Date: Thu, 2 May 2013 09:03:37 +0200
> 
> > I'll also have a look at this.
> 
> By the mere existence of /sys/devices/${DEV_PATH}/net/${netdev_name}/flags
> we have to preserve the bit layout.
> 
> So Linus was right.
> 
> So network manager is probably reading that flags sysfs file and
> interpreting it.

Right, that seems plausible. 

> I'll fix the layout to how it was before.

I also found one spot in net/core/dev.c which was using an int for the
features. Patch attached.