From a886f65ded53867df6b70f74ebd7fd8e351d1587 Mon Sep 17 00:00:00 2001
From: Liam Mark <lmark@codeaurora.org>
Date: Wed, 26 Aug 2015 16:46:19 -0700
Subject: [PATCH] mm/Kconfig: support forcing allocators to return ZONE_DMA
 memory

Add a new config item, CONFIG_FORCE_ALLOC_FROM_DMA_ZONE, which
can be used to optionally force certain allocators to always
return memory from ZONE_DMA.

This option helps ensure that clients who require ZONE_DMA
memory are always using ZONE_DMA memory.

Change-Id: Id2d36214307789f27aa775c2bef2dab5047c4ff0
Signed-off-by: Liam Mark <lmark@codeaurora.org>
---
 mm/Kconfig | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index 7b7eae150c4e..abfaf331c140 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -690,3 +690,13 @@ config ZONE_DEVICE
 
 config FRAME_VECTOR
 	bool
+
+config FORCE_ALLOC_FROM_DMA_ZONE
+	bool "Force certain memory allocators to always return ZONE_DMA memory"
+	depends on ZONE_DMA
+	help
+	  Ensure certain memory allocators always return memory from ZONE_DMA.
+	  This option helps ensure that clients who require ZONE_DMA memory are
+	  always using ZONE_DMA memory.
+
+	  If unsure, say "n".