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Date: Sun, 28 Oct 2007 11:27:23 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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Subject: Re: struct user . u_ar0
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To: Mike Frysinger <vapier.adi@gmail.com>
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Mike Frysinger wrote:
> 
> Blackfin doesnt support a.out, so it may be easier to just change it
> to "reserved2" (assuming this structure is part of our ABI), or delete
> it (assuming the structure is internal to the kernel only).
> -mike

Blackfin explicitly sets in in arch/blackfin/kernel/process.c, so you 
might want to consider what it is used for.  As far as a.out is 
concerned, it appears to be part of the core dump format.

	-hpa