From cf5621032fbe7354c0c3fff17958b7029bbc9f30 Mon Sep 17 00:00:00 2001
From: Scott Wood <scottwood@freescale.com>
Date: Fri, 8 Aug 2014 18:40:44 -0500
Subject: [PATCH] powerpc/64: Limit ZONE_DMA32 to 4GiB in swiotlb_detect_4g()

A DMA zone is still needed with swiotlb, for coherent allocations.
This doesn't affect platforms that don't use swiotlb or that don't call
swiotlb_detect_4g().

Signed-off-by: Scott Wood <scottwood@freescale.com>
Cc: Shaohui Xie <Shaohui.Xie@freescale.com>
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