linux-kernel - Re: [PATCH v3 2/4] lib/test_bitmap.c: Add for_each_set

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Message-ID: <20200429101627.GD185537@smile.fi.intel.com>
Date:   Wed, 29 Apr 2020 13:16:27 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Syed Nayyar Waris <syednwaris@...il.com>
Cc:     akpm@...ux-foundation.org, vilhelm.gray@...il.com,
        linus.walleij@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] lib/test_bitmap.c: Add for_each_set_clump test
 cases

On Wed, Apr 29, 2020 at 04:35:58AM +0530, Syed Nayyar Waris wrote:
> The introduction of the generic for_each_set_clump macro need test
> cases to verify the implementation. This patch adds test cases for
> scenarios in which clump sizes are 8 bits, 24 bits, 30 bits and 6 bits.
> The cases contain situations where clump is getting split at the word
> boundary and also when zeroes are present in the start and middle of
> bitmap.

...

> +static void __init test_for_each_set_clump(void)
> +{
> +	/* common bitmap of max size for different tests */
> +	DECLARE_BITMAP(bits, 256);
> +
> +	/* set bitmap for test case 1 with clump size as 8 bits */
> +	bitmap_set_value(bits, 0x38000201, 0, 32);
> +	bitmap_set_value(bits, 0x05ff0f38, 32, 32);
> +
> +	execute_for_each_set_clump(bits, 64, clump_exp1, 8);
> +
> +	/* set bitmap for test case 2 with clump size as 24 bits */
> +	bitmap_set_value(bits, 0xeffedcba, 0, 32);
> +	bitmap_set_value(bits, 0xbbbbabcd, 32, 32);
> +	bitmap_set_value(bits, 0x000000aa, 64, 32);
> +	bitmap_set_value(bits, 0x000000aa, 96, 32);
> +	bitmap_set_value(bits, 0x00ff0000, 128, 32);
> +	bitmap_set_value(bits, 0xaaaaaa00, 160, 32);
> +	bitmap_set_value(bits, 0xff000000, 192, 32);
> +	bitmap_set_value(bits, 0x00aa0000, 224, 32);
> +
> +	execute_for_each_set_clump(bits, 240, clump_exp2, 24);
> +
> +	/* set bitmap for test case 3 with clump size as 30 bits */
> +	bitmap_set_value(bits, 0x00000000, 0, 32);
> +	bitmap_set_value(bits, 0x00000000, 32, 32);
> +	bitmap_set_value(bits, 0x00000000, 64, 32);
> +	bitmap_set_value(bits, 0x0f000000, 96, 32);
> +
> +	execute_for_each_set_clump(bits, 240, clump_exp3, 30);
> +
> +	/* set bitmap for test case 4 with clump size as 6 bits */
> +	bitmap_set_value(bits, 0x00000ac0, 0, 32);
> +	execute_for_each_set_clump(bits, 18, clump_exp4, 6);

You can roll entire function into one loop

	for i in ARRAY(test_data_configuration):
		prepare_test_data()
		execute_test()

> +}

-- 
With Best Regards,
Andy Shevchenko