dma-mapping: translate __GFP_NOFAIL to DMA_ATTR_NO_WARN

This allows all dma_map_ops instances to entirely rely on
DMA_ATTR_NO_WARN going forward.

Signed-off-by: Christoph Hellwig <[e-mail]>
Acked-by: Robin Murphy <[e-mail]>

include/linux/dma-mapping.h

···
 }
 
 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
-		dma_addr_t *dma_handle, gfp_t flag)
+		dma_addr_t *dma_handle, gfp_t gfp)
 {
-	return dma_alloc_attrs(dev, size, dma_handle, flag, 0);
+
+	return dma_alloc_attrs(dev, size, dma_handle, gfp,
+			(gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0);
 }
 
 static inline void dma_free_coherent(struct device *dev, size_t size,
···
 static inline void *dma_alloc_wc(struct device *dev, size_t size,
 				 dma_addr_t *dma_addr, gfp_t gfp)
 {
-	return dma_alloc_attrs(dev, size, dma_addr, gfp,
-			       DMA_ATTR_WRITE_COMBINE);
+	unsigned long attrs = DMA_ATTR_NO_WARN;
+
+	if (gfp & __GFP_NOWARN)
+		attrs |= DMA_ATTR_NO_WARN;
+
+	return dma_alloc_attrs(dev, size, dma_addr, gfp, attrs);
 }
 #ifndef dma_alloc_writecombine
 #define dma_alloc_writecombine dma_alloc_wc