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dma/direct: turn ARCH_ZONE_DMA_BITS into a variable

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Some architectures, notably ARM, are interested in tweaking this
depending on their runtime DMA addressing limitations.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Nicolas Saenz Julienne 2019-10-14 20:31:03 +02:00 • committed by Catalin Marinas
parent 4686da5140
commit 8b5369ea58
8 changed files with 31 additions and 27 deletions
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2
include/linux/dma-direct.h
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@ -5,6 +5,8 @@
#include <linux/dma-mapping.h>
#include <linux/mem_encrypt.h>
extern unsigned int zone_dma_bits;
#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
#include <asm/dma-direct.h>
#else