linux-kernel - Re: [PATCH 2/8] lib: test_bitmap: add more start-end:offset/len tests

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Date:   Tue, 26 Jan 2021 23:11:23 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:     linux-kernel@...r.kernel.org, lizefan@...wei.com, mingo@...nel.org,
        tglx@...utronix.de, josh@...htriplett.org, yury.norov@...il.com,
        peterz@...radead.org, paulmck@...nel.org, fweisbec@...il.com,
        linux@...musvillemoes.dk
Subject: Re: [PATCH 2/8] lib: test_bitmap: add more start-end:offset/len tests

On Tue, Jan 26, 2021 at 12:11:35PM -0500, Paul Gortmaker wrote:
> There are inputs to bitmap_parselist() that would probably never
> be entered manually by a person, but might result from some kind of
> automated input generator.  Things like ranges of length 1, or group
> lengths longer than nbits, overlaps, or offsets of zero.
> 
> Adding these tests serve two purposes:
> 
> 1) document what might seem odd but nonetheless valid input.
> 
> 2) don't regress from what we currently accept as valid.

Makes sense.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Cc: Yury Norov <yury.norov@...il.com>
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
>  lib/test_bitmap.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c
> index 3d2cd3b1de84..807d1e8dd59c 100644
> --- a/lib/test_bitmap.c
> +++ b/lib/test_bitmap.c
> @@ -35,6 +35,8 @@ static const unsigned long exp1[] __initconst = {
>  	BITMAP_FROM_U64(0x3333333311111111ULL),
>  	BITMAP_FROM_U64(0xffffffff77777777ULL),
>  	BITMAP_FROM_U64(0),
> +	BITMAP_FROM_U64(0x00008000),
> +	BITMAP_FROM_U64(0x80000000),
>  };
>  
>  static const unsigned long exp2[] __initconst = {
> @@ -335,6 +337,26 @@ static const struct test_bitmap_parselist parselist_tests[] __initconst = {
>  	{0, " ,  ,,  , ,   ",		&exp1[12 * step], 8, 0},
>  	{0, " ,  ,,  , ,   \n",		&exp1[12 * step], 8, 0},
>  
> +	{0, "0-0",			&exp1[0], 32, 0},
> +	{0, "1-1",			&exp1[1 * step], 32, 0},
> +	{0, "15-15",			&exp1[13 * step], 32, 0},
> +	{0, "31-31",			&exp1[14 * step], 32, 0},
> +
> +	{0, "0-0:0/1",			&exp1[12 * step], 32, 0},
> +	{0, "0-0:1/1",			&exp1[0], 32, 0},
> +	{0, "0-0:1/31",			&exp1[0], 32, 0},
> +	{0, "0-0:31/31",		&exp1[0], 32, 0},
> +	{0, "1-1:1/1",			&exp1[1 * step], 32, 0},
> +	{0, "0-15:16/31",		&exp1[2 * step], 32, 0},
> +	{0, "15-15:1/2",		&exp1[13 * step], 32, 0},
> +	{0, "15-15:31/31",		&exp1[13 * step], 32, 0},
> +	{0, "15-31:1/31",		&exp1[13 * step], 32, 0},
> +	{0, "16-31:16/31",		&exp1[3 * step], 32, 0},
> +	{0, "31-31:31/31",		&exp1[14 * step], 32, 0},
> +
> +	{0, "0-31:1/3,1-31:1/3,2-31:1/3",	&exp1[8 * step], 32, 0},
> +	{0, "1-10:8/12,8-31:24/29,0-31:0/3",	&exp1[9 * step], 32, 0},
> +
>  	{-EINVAL, "-1",	NULL, 8, 0},
>  	{-EINVAL, "-0",	NULL, 8, 0},
>  	{-EINVAL, "10-1", NULL, 8, 0},	/* (start > end) ; also ERANGE */
> -- 
> 2.17.1
> 

-- 
With Best Regards,
Andy Shevchenko