ARM: mm: don't limit default CMA region only to low memory

DMA-mapping supports CMA regions places either in low or high memory, so
there is no longer needed to limit default CMA regions only to low memory.
 The real limit is still defined by architecture specific DMA limit.

Signed-off-by: Marek Szyprowski <[email protected]>
Reported-by: Russell King - ARM Linux <[email protected]>
Acked-by: Michal Nazarewicz <[email protected]>
Cc: Daniel Drake <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: mszyprow

arch/arm/mm/init.c

@@ -322,7 +322,7 @@ void __init arm_memblock_init(const struct machine_desc *mdesc)
 	 * reserve memory for DMA contigouos allocations,
 	 * must come from DMA area inside low memory
 	 */
-	dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit));
+	dma_contiguous_reserve(arm_dma_limit);
 
 	arm_memblock_steal_permitted = false;
 	memblock_dump_all();