> +static int nvme_init_dma_buf_io_ctx(struct block_device *bdev, > + struct dma_buf_io_ctx *ctx)
Please stick to two-tab indents for function declaration continuation for the nvme code to keep the code easy to maintain. > +#if defined(CONFIG_DMA_SHARED_BUFFER) This should be good old #ifdef. Same in a few other places over the series. Modulo these minor nits the patch looks good.
