linux-kernel - Re: [PATCH v10 06/11] math.h: Add macros for rounding to closest value

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Date: Thu, 30 May 2024 22:19:37 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Devarsh Thakkar <devarsht@...com>
Cc: mchehab@...nel.org, hverkuil-cisco@...all.nl,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	benjamin.gaignard@...labora.com, sebastian.fricke@...labora.com,
	akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
	adobriyan@...il.com, jani.nikula@...el.com, p.zabel@...gutronix.de,
	airlied@...il.com, daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
	laurent.pinchart@...asonboard.com, praneeth@...com, nm@...com,
	vigneshr@...com, a-bhatia1@...com, j-luthra@...com, b-brnich@...com,
	detheridge@...com, p-mantena@...com, vijayp@...com,
	andrzej.p@...labora.com, nicolas@...fresne.ca, davidgow@...gle.com,
	dlatypov@...gle.com
Subject: Re: [PATCH v10 06/11] math.h: Add macros for rounding to closest
 value

On Thu, May 30, 2024 at 10:42:25PM +0530, Devarsh Thakkar wrote:
> Add below rounding related macros:
> 
> round_closest_up(x, y) : Rounds x to closest multiple of y where y is a
> power of 2, with a preference to round up in case two nearest values are
> possible.
> 
> round_closest_down(x, y) : Rounds x to closest multiple of y where y is a
> power of 2, with a preference to round down in case two nearest values are
> possible.
> 
> roundclosest(x, y) : Rounds x to closest multiple of y, this macro should
> generally be used only when y is not multiple of 2 as otherwise
> round_closest* macros should be used which are much faster.
> 
> Examples:
>  * round_closest_up(17, 4) = 16
>  * round_closest_up(15, 4) = 16
>  * round_closest_up(14, 4) = 16
>  * round_closest_down(17, 4) = 16
>  * round_closest_down(15, 4) = 16
>  * round_closest_down(14, 4) = 12
>  * roundclosest(21, 5) = 20
>  * roundclosest(19, 5) = 20
>  * roundclosest(17, 5) = 15

..

> + * Examples :

It's inconsistent with the other one below.

> + * 	round_closest_up(17, 4) = 16
> + *
> + * 	round_closest_up(15, 4) = 16
> + *
> + * 	round_closest_up(14, 4) = 16

The three have TABs/spaces mixture.

I believe you wanted:

 * Examples::
 * * round_closest_up(17, 4) = 16
 * * round_closest_up(15, 4) = 16
 * * round_closest_up(14, 4) = 16

..

> + * Examples:
> + *
> + * 	round_closest_down(17, 4) = 16
> + *
> + * 	round_closest_down(15, 4) = 16
> + *
> + * 	round_closest_down(14, 4) = 12

As per above

..

> + * Examples :
> + *
> + * 	roundclosest(21, 5) = 20
> + *
> + * 	roundclosest(19, 5) = 20
> + *
> + * 	roundclosest(17, 5) = 15

As per above.

-- 
With Best Regards,
Andy Shevchenko