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#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))

struct scatterlist {

    unsigned long   page_link;

    unsigned int    offset;

    unsigned int    length;

    dma_addr_t      dma_address;

    unsigned int    dma_length;

};

struct sg_table {

    struct scatterlist *sgl;        /* the list */

    unsigned int nents;             /* number of mapped entries */

    unsigned int orig_nents;        /* original size of list */

};

#define SG_MAX_SINGLE_ALLOC             (4096 / sizeof(struct scatterlist))

struct scatterlist *sg_next(struct scatterlist *sg);

#define sg_dma_address(sg)      ((sg)->dma_address)

#define sg_dma_len(sg)         ((sg)->length)

#define sg_is_chain(sg)         ((sg)->page_link & 0x01)

#define sg_is_last(sg)          ((sg)->page_link & 0x02)

#define sg_chain_ptr(sg)        \

        ((struct scatterlist *) ((sg)->page_link & ~0x03))

static inline addr_t sg_page(struct scatterlist *sg)

{

    return (addr_t)((sg)->page_link & ~0x3);

}