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dma-mapping: provide a fallback dma_default_coherent

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dma_default_coherent was decleared unconditionally at kernel/dma/mapping.c
but only decleared when any of non-coherent options is enabled in
dma-map-ops.h.

Guard the declaration in mapping.c with non-coherent options and provide
a fallback definition.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jiaxun Yang 2023-04-01 10:15:29 +01:00 committed by Christoph Hellwig
parent b31507dcaf
commit fe4e5efa40
2 changed files with 6 additions and 0 deletions
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2
include/linux/dma-map-ops.h
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@ -269,6 +269,8 @@ static inline bool dev_is_dma_coherent(struct device *dev)
return dev->dma_coherent;
}
#else
#define dma_default_coherent true
static inline bool dev_is_dma_coherent(struct device *dev)
{
return true;

4
kernel/dma/mapping.c
View File

@ -17,7 +17,11 @@
#include "debug.h"
#include "direct.h"
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
bool dma_default_coherent;
#endif
/*
* Managed DMA API