[PATCH v2 2/5] dma-mapping: Provide a fallback dma_default_coherent

Jiaxun Yang
2023-02-23T11:37:16Z

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>
---
include/linux/dma-map-ops.h | 1 +
kernel/dma/mapping.c | 4 ++++
2 files changed, 5 insertions(+)

diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h
index 41bf4bdb117a..0a1aaf7163b3 100644
--- a/include/linux/dma-map-ops.h
+++ b/include/linux/dma-map-ops.h
@@ -269,6 +269,7 @@ 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;
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 68106e3791f6..80f9663ffe26 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -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
--
2.37.1 (Apple Git-137.1)