netdev - Re: [PATCH 1/4] inet: Add skb_copy_datagram

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Message-ID: <20141110065817.GG7996@ZenIV.linux.org.uk>
Date:	Mon, 10 Nov 2014 06:58:17 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	David Miller <davem@...emloft.net>
Cc:	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, bcrl@...ck.org, mst@...hat.com
Subject: Re: [PATCH 1/4] inet: Add skb_copy_datagram_iter

On Mon, Nov 10, 2014 at 12:20:20AM -0500, David Miller wrote:
> From: Al Viro <viro@...IV.linux.org.uk>
> Date: Sun, 9 Nov 2014 21:19:08 +0000
> 
> > 1) does sparc64 access_ok() need to differ for 32bit and 64bit tasks?
> 
> sparc64 will just fault no matter what kind of task it is.
> 
> It is impossible for a user task to generate a reference to
> a kernel virtual address, as kernel and user accesses each
> go via a separate address space identifier.

Sure, but why do we have access_ok() there at all?  I.e. why not just have
it constant 1?
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