From 77cbe828a10026f8ff208eaa67d75675a3ffbdfc Mon Sep 17 00:00:00 2001
From: Rebecca Schultz Zavin <rschultz@google.com>
Date: Fri, 13 Dec 2013 14:24:31 -0800
Subject: [PATCH] gpu: ion: Modify zeroing code so it only allocates address
 space once

vmap/vunmap spend a significant amount of time allocating the
address space to map into.  Rather than allocating address space
for each page, instead allocate once for the entire allocation
and then just map and unmap each page into that address space.

Signed-off-by: Rebecca Schultz Zavin <rschultz@google.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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