From 07141d408124bcf71aa160102e166950610dd862 Mon Sep 17 00:00:00 2001
From: Asha Magadi Venkateshamurthy <amagad@codeaurora.org>
Date: Tue, 29 Sep 2020 21:42:54 +0530
Subject: [PATCH] mm/Kconfig: forcing allocators to return ZONE_DMA32 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_DMA32.

This option helps ensure that clients who require ZONE_DMA32
memory are always using ZONE_DMA32 memory.

Change-Id: Id2d36214307789f27aa775c2bef2dab5047c4ff0
Signed-off-by: Praveen Kurapati <pkurapat@codeaurora.org>
Signed-off-by: Liam Mark <lmark@codeaurora.org>
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
Signed-off-by: Asha Magadi Venkateshamurthy <amagad@codeaurora.org>
---
 mm/Kconfig | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index c73d368dbd60..b6dbab55f77a 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -875,3 +875,13 @@ config PROCESS_RECLAIM
 	 (addr, addr + size-bytes) of the process.
 
 	 Any other value is ignored.
+
+config FORCE_ALLOC_FROM_DMA_ZONE
+	bool "Force certain memory allocators to always return ZONE_DMA32 memory"
+	depends on ZONE_DMA32
+	help
+	  Ensure certain memory allocators always return memory from ZONE_DMA32.
+	  This option helps ensure that clients who require ZONE_DMA32 memory are
+	  always using ZONE_DMA32 memory.
+
+	  If unsure, say "n".