On Fri, Nov 09, 2018 at 03:12:34PM -0800, David Miller wrote:
> But patch #2 on the other hand, not so much.
>
> I hate seeing values returned by reference, it adds cost especially
> on cpus where all argments and return values fit in registers (we end
> up forcing a stack slot and memory
From: Christoph Hellwig
Date: Fri, 9 Nov 2018 09:46:30 +0100
> Error reporting for the dma_map_single and dma_map_page operations is
> currently a mess. Both APIs directly return the dma_addr_t to be used for
> the DMA, with a magic error escape that is specific to the instance and
> checked
Error reporting for the dma_map_single and dma_map_page operations is
currently a mess. Both APIs directly return the dma_addr_t to be used for
the DMA, with a magic error escape that is specific to the instance and
checked by another method provided. This has a few downsides:
- the error
