+config DMA_API_DEBUG_POISON
+ bool "Poison coherent DMA buffers"
+ depends on DMA_API_DEBUG && EXPERT
+ help
+ Poison DMA buffers returned by dma_alloc_coherent unless __GFP_ZERO
+ is explicitly specified, to catch drivers depending on zeroed buffers
+ without passing the correct flags.
+
+ Only say Y if you're prepared for almost everything to break.
+