ucmpdi2.c

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#include <linux/module.h>

union ull_union {
    unsigned long long ull;
    struct {
        unsigned int high;
        unsigned int low;
    } ui;
};

int __ucmpdi2(unsigned long long a, unsigned long long b)
{
    union ull_union au = {.ull = a};
    union ull_union bu = {.ull = b};

    if (au.ui.high < bu.ui.high)
        return 0;
    else if (au.ui.high > bu.ui.high)
        return 2;
    if (au.ui.low < bu.ui.low)
        return 0;
    else if (au.ui.low > bu.ui.low)
        return 2;
    return 1;
}
EXPORT_SYMBOL(__ucmpdi2);