From 6130f5315ee80a591285a25957af71621bd0f17e Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 3 Feb 2014 18:19:51 -0500
Subject: [PATCH] switch vmsplice_to_user() to copy_page_to_iter()

I've switched the sanity checks on iovec to rw_copy_check_uvector();
we might need to do a local analog, if any behaviour differences are
not actually bugfixes here...

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