函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:lib\test_string.c Create Date:2022-07-27 07:22:55
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static __init int memset64_selftest(void)
{
    unsigned i, j, k;
    u64 v, *p;
 
    p = kmalloc(256 * 2 * 8, GFP_KERNEL);
    if (!p)
        return -1;
 
    for (i = 0; i < 256; i++) {
        for (j = 0; j < 256; j++) {
            memset(p, 0xa1, 256 * 2 * sizeof(v));
            memset64(p + i, 0xb1b2b3b4b5b6b7b8ULL, j);
            for (k = 0; k < 512; k++) {
                v = p[k];
                if (k < i) {
                    if (v != 0xa1a1a1a1a1a1a1a1ULL)
                        goto fail;
                } else if (k < i + j) {
                    if (v != 0xb1b2b3b4b5b6b7b8ULL)
                        goto fail;
                } else {
                    if (v != 0xa1a1a1a1a1a1a1a1ULL)
                        goto fail;
                }
            }
        }
    }
 
fail:
    kfree(p);
    if (i < 256)
        return (i << 24) | (j << 16) | k | 0x8000;
    return 0;
}