On Thu, Mar 30, 2017 at 11:29:57AM +0300, Mathias Nyman wrote: > >> > >>the other way around. First you patch dma_alloc_coherent() to > >>dma_zalloc_coherent() and that could go in during the -rc and possibly > >>get a stable tag, since spec requires kernel to zero the memory area. > >> > >>-- > >>balbi > > > >In fact, it fixes two things at spec, the other thing is the scratchpad > >buffer needs to be page_size boundary. I will send these two fixes > >first. > > > > If I remember correctly dma_alloc_coherent() takes care of proper alignment > and won't cross the boundary >
Sorry to reply late. The dma_alloc_coherent design is different per platform, and both the code include/linux/dma-mapping.h and doc Documentation/DMA-API.txt does not mention boundary and alignment. -- Best Regards, Peter Chen -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
