From: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>
Date: Fri, 25 Apr 2008 15:37:33 +0900 (JST)

quoted text
> In article <20080424.233159.06679047.davem@davemloft.net> (at Thu, 24 Apr 2008 23:31:59 -0700 (PDT)), David Miller <davem@davemloft.net> says:
> 
> > 1) Use copy_in_user() as that's the proper interaface to copy within
> >    userspace in COMPAT code.
> 
> So, don't we care increase of copy operation with it?

I think for now it's an OK tradeoff, but yes it does increase
copies.  But then again, many compat layer handlers do.
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