static int __spi_split_transfer_maxsize(struct spi_controller *ctlr,
					struct spi_message *msg,
					struct spi_transfer **xferp,
					size_t maxsize,
					gfp_t gfp)
static int __spi_split_transfer_maxsize(struct spi_controller *ctlr,
					struct spi_message *msg,
					struct spi_transfer **xferp,
					size_t maxsize)