From cd28e28d801e052a3378161c9cb3231828cfaa77 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 3 Apr 2015 15:57:04 -0400
Subject: [PATCH] switch drivers/char/mem.c to ->read_iter/->write_iter

Note that _these_ guys have ->read() and ->write() left in place - they are
eqiuvalent to what we'd get if we replaced those with NULL, but we are
talking about hot paths here.

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