I really don't see where you got that thought from.  A bio_vec is:
struct bio_vec {
        struct page     *bv_page;
        unsigned int    bv_len;
        unsigned int    bv_offset;
};
bv_offset is unsigned int.  Therefore, vec_offset should be likewise.
-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html
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