SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
        struct kexec_segment __user *, segments, unsigned long, flags)
{
    struct kexec_segment *ksegments;
    unsigned long result;

    result = kexec_load_check(nr_segments, flags);
    printk("%s kexec_load_check: %ld", __func__, result);
    if (result)
        return result;

    /* Verify we are on the appropriate architecture */
    printk("%s checking arch...", __func__);
    if (((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH) &&
        ((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT))
        {
            printk("%s kexec invalid arch", __func__);
        return -EINVAL;}

    printk("%s calling memdup_user...", __func__);
    ksegments = memdup_user(segments, nr_segments * sizeof(ksegments[0]));
    if (IS_ERR(ksegments)) {
        printk("%s memdup_user error", __func__);
        return PTR_ERR(ksegments);
    }

    printk("%s performing load...", __func__);
    result = do_kexec_load(entry, nr_segments, ksegments, flags);
    printk("%s do_kexec_load: %ld", __func__, result);
    kfree(ksegments);
    printk("%s segments freed: %ld", __func__, result);
    return result;
}