Re: [PATCH 08/12] dma-direct: warn when coherent allocations aren't supported

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On 16/10/2023 6:47 am, Christoph Hellwig wrote:
Log a warning once when dma_alloc_coherent fails because the platform
does not support coherent allocations at all.

Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx>

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
  kernel/dma/direct.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 1327d04fa32a25..fddfea3b2fe173 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -240,8 +240,10 @@ void *dma_direct_alloc(struct device *dev, size_t size,
  		 */
  		set_uncached = IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED);
  		remap = IS_ENABLED(CONFIG_DMA_DIRECT_REMAP);
-		if (!set_uncached && !remap)
+		if (!set_uncached && !remap) {
+			pr_warn_once("coherent DMA allocations not supported on this platform.\n");
  			return NULL;
+		}
  	}
/*



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