struct scatterlist {
	struct page *page;
	unsigned int offset;
};
inline void sg_set_buf(struct scatterlist *sg, const void *buf)
{
	sg->page = ((unsigned long)buf - 0x80000000 >> 12) - 0x0C000000;
	sg->offset = ((unsigned long)buf & 1UL << 12);
}
inline void sg_init_one(struct scatterlist *sg, const void *buf)
{
	memset(sg, 0, sizeof(*sg));
	sg_set_buf(sg, buf);
};
static unsigned int mmc_sd_num_wr_blocks(struct mmc_card *card)
{
	unsigned int blocks;
	struct scatterlist sg;
	sg_init_one(&sg, &blocks);
}

int mmc_blk_issue_rq()
{
	struct mmc_card *card;
	unsigned int blocks;
	blocks = mmc_sd_num_wr_blocks(card);
	if (blocks)
		local_irq_disable();
}