[PATCH v7 02/17] dma: Allow dma_get_cache_alignment() to be overridden by the arch code

[Catalin Marinas]

On arm64, ARCH_DMA_MINALIGN is larger than most cache line size
configurations deployed. Allow an architecture to override
dma_get_cache_alignment() in order to return a run-time probed value
(e.g. cache_line_size()).

Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
Cc: Robin Murphy <robin.murphy at arm.com>
Cc: Will Deacon <will at kernel.org>
Tested-by: Isaac J. Manjarres <isaacmanjarres at google.com>
---
 include/linux/dma-mapping.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index a50375331eac..e13050eb9777 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -544,6 +544,7 @@ static inline int dma_set_min_align_mask(struct device *dev,
 	return 0;
 }
 
+#ifndef dma_get_cache_alignment
 static inline int dma_get_cache_alignment(void)
 {
 #ifdef ARCH_HAS_DMA_MINALIGN
@@ -551,6 +552,7 @@ static inline int dma_get_cache_alignment(void)
 #endif
 	return 1;
 }
+#endif
 
 static inline void *dmam_alloc_coherent(struct device *dev, size_t size,
 		dma_addr_t *dma_handle, gfp_t gfp)