Source of xor.c - linux-imx - PHYTEC BitBucket (Stash)

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    fastest = XOR_SELECT_TEMPLATE(NULL);
​
    if (fastest) {
        printk(KERN_INFO "xor: automatically using best "
                 "checksumming function   %-10s\n",
               fastest->name);
        goto out;
    }
​
    /*
     * Note: Since the memory is not actually used for _anything_ but to
     * test the XOR speed, we don't really want kmemcheck to warn about
     * reading uninitialized bytes here.
     */
    b1 = (void *) __get_free_pages(GFP_KERNEL | __GFP_NOTRACK, 2);
    b1 = (void *) __get_free_pages(GFP_KERNEL, 2);
    if (!b1) {
        printk(KERN_WARNING "xor: Yikes!  No memory available.\n");
        return -ENOMEM;
    }
    b2 = b1 + 2*PAGE_SIZE + BENCH_SIZE;
​
    /*
     * If this arch/cpu has a short-circuited selection, don't loop through
     * all the possible functions, just test the best one
     */