Re: [PATCH] bitops: simplify get_count_order_long()

[Wei Yang]

On Mon, May 25, 2020 at 03:31:46PM -0700, Andrew Morton wrote:
>On Mon, 25 May 2020 21:57:41 +0000 Wei Yang <richard.weiy...@gmail.com> wrote:
>
>> I see the patch just merged, so I suppose to add the above test code into 
>> that
>> one?
>
>Well, that's not really test code.
>
>But yes, something which tests both the 32-bit and 64-bit functions would be
>nice, sometime.

Mimic the test_bitops.c, I wrote a test like this:

/* a tiny module only meant to test get_count_order/long */
unsigned int order_comb[][2] = {
        {0x00000003,  2},
        {0x00000004,  2},
        {0x00001fff, 13},
        {0x00002000, 13},
        {0x50000000, 32},
        {0x80000000, 32},
};

static int __init test_getorder_startup(void)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
                if (order_comb[i][1] != get_count_order(order_comb[i][0]))
                        pr_warn("get_count_order wrong for %lx\n",
                                        order_comb[i][0]);
        }

        return 0;
}

Since I don't get a way to iterate all the possibilities, some random
combination is chosen. Is this one looks good?

-- 
Wei Yang
Help you, Help me