On Tue, May 11, 2010 at 16:38, Pekka Enberg wrote: > Mike Frysinger wrote: >> that is a question for David/Grant. i'm not the SPI core maintainer, >> i'm merely watching over some SPI drivers. however, this answer also >> doesnt sound like it's thinking big enough because what you're >> proposing isnt specific to the SPI bus -- any time a DMA safe buffer >> is needed dynamically, this function could be used. > > Well, we have dma_alloc_coherent(), shouldn't you be using that instead? my understanding is that dma_alloc_coherent() gives you a buffer that is always coherent. the SPI layers take care of flushing and such on the fly which means allocating coherent memory is overkill and bad for performance. -mike -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
