From 81055e584f9d743cb13dc7944923d817c20f089d Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 4 Apr 2014 19:23:46 -0400
Subject: [PATCH] optimize copy_page_{to,from}_iter()

if we'd ended up in the end of a segment, jump to the
beginning of the next one (iov_offset = 0, iov++),
rather than having the next primitive deal with that.

Ought to be folded back...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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