linux-kernel - Re: [PATCH v11 06/11] math.h: Add macros for rounding to closest value

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Message-ID: <ZloMFfGKLry6EWNL@smile.fi.intel.com>
Date: Fri, 31 May 2024 20:42:45 +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,
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	andrzej.p@...labora.com, nicolas@...fresne.ca, davidgow@...gle.com,
	dlatypov@...gle.com
Subject: Re: [PATCH v11 06/11] math.h: Add macros for rounding to closest
 value

On Fri, May 31, 2024 at 10:41:36PM +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

I don't know the estimation on how these will really useful or not, but I'm not
objecting if people think it's needed API.

Acked-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

-- 
With Best Regards,
Andy Shevchenko