linux-kernel - Re: [PATCH] mean_and_variance: Drop always failing tests

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Date: Tue, 2 Apr 2024 07:03:33 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: "Daniel B . Hill" <daniel@...o.nz>
Cc: linux-kernel@...r.kernel.org,
	Kent Overstreet <kent.overstreet@...ux.dev>
Subject: Re: [PATCH] mean_and_variance: Drop always failing tests

On Sun, Feb 25, 2024 at 08:29:25AM -0800, Guenter Roeck wrote:
> mean_and_variance_test_2 and mean_and_variance_test_4 always fail.
> The input parameters to those tests are identical to the input parameters
> to tests 1 and 3, yet the expected result for tests 2 and 4 is different
> for the mean and stddev tests. That will always fail.
> 
>      Expected mean_and_variance_get_mean(mv) == mean[i], but
>         mean_and_variance_get_mean(mv) == 22 (0x16)
>         mean[i] == 10 (0xa)
> 
> Drop the bad tests.
> 

I did not get any response ...  ping ....

Guenter

> Fixes: 65bc41090720 ("mean and variance: More tests")
> Closes: https://lore.kernel.org/lkml/065b94eb-6a24-4248-b7d7-d3212efb4787@roeck-us.net/
> Cc: Kent Overstreet <kent.overstreet@...ux.dev>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> Based on next-20240223. Sorry for the noise if this has already been
> addressed.
> 
> Tested on top of mainline kernel (v6.8-rc5-329-gab0a97cffa0b)
> to avoid other problems seen in next-20240223.
> 
>  lib/math/mean_and_variance_test.c | 28 +---------------------------
>  1 file changed, 1 insertion(+), 27 deletions(-)
> 
> diff --git a/lib/math/mean_and_variance_test.c b/lib/math/mean_and_variance_test.c
> index 0d8c2451a858..fe8309f456a3 100644
> --- a/lib/math/mean_and_variance_test.c
> +++ b/lib/math/mean_and_variance_test.c
> @@ -135,20 +135,8 @@ static void mean_and_variance_test_1(struct kunit *test)
>  			d, mean, stddev, weighted_mean, weighted_stddev);
>  }
>  
> -static void mean_and_variance_test_2(struct kunit *test)
> -{
> -	s64 d[]			= { 100, 10, 10, 10, 10, 10, 10 };
> -	s64 mean[]		= {  10, 10, 10, 10, 10, 10, 10 };
> -	s64 stddev[]		= {   9,  9,  9,  9,  9,  9,  9 };
> -	s64 weighted_mean[]	= {  32, 27, 22, 19, 17, 15, 14 };
> -	s64 weighted_stddev[]	= {  38, 35, 31, 27, 24, 21, 18 };
> -
> -	do_mean_and_variance_test(test, 10, 6, ARRAY_SIZE(d), 2,
> -			d, mean, stddev, weighted_mean, weighted_stddev);
> -}
> -
>  /* Test behaviour where we switch from one steady state to another: */
> -static void mean_and_variance_test_3(struct kunit *test)
> +static void mean_and_variance_test_2(struct kunit *test)
>  {
>  	s64 d[]			= { 100, 100, 100, 100, 100 };
>  	s64 mean[]		= {  22,  32,  40,  46,  50 };
> @@ -160,18 +148,6 @@ static void mean_and_variance_test_3(struct kunit *test)
>  			d, mean, stddev, weighted_mean, weighted_stddev);
>  }
>  
> -static void mean_and_variance_test_4(struct kunit *test)
> -{
> -	s64 d[]			= { 100, 100, 100, 100, 100 };
> -	s64 mean[]		= {  10,  11,  12,  13,  14 };
> -	s64 stddev[]		= {   9,  13,  15,  17,  19 };
> -	s64 weighted_mean[]	= {  32,  49,  61,  71,  78 };
> -	s64 weighted_stddev[]	= {  38,  44,  44,  41,  38 };
> -
> -	do_mean_and_variance_test(test, 10, 6, ARRAY_SIZE(d), 2,
> -			d, mean, stddev, weighted_mean, weighted_stddev);
> -}
> -
>  static void mean_and_variance_fast_divpow2(struct kunit *test)
>  {
>  	s64 i;
> @@ -229,8 +205,6 @@ static struct kunit_case mean_and_variance_test_cases[] = {
>  	KUNIT_CASE(mean_and_variance_weighted_advanced_test),
>  	KUNIT_CASE(mean_and_variance_test_1),
>  	KUNIT_CASE(mean_and_variance_test_2),
> -	KUNIT_CASE(mean_and_variance_test_3),
> -	KUNIT_CASE(mean_and_variance_test_4),
>  	{}
>  };
>  
> -- 
> 2.39.2
>