linux-kernel - Re: [PATCH v7 8/8] gpu: ipu-v3: Use generic macro for rounding to nearest multiple

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Message-ID: <20240510151642.GA17158@pendragon.ideasonboard.com>
Date: Fri, 10 May 2024 18:16:42 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Devarsh Thakkar <devarsht@...com>, 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, p.zabel@...gutronix.de,
	airlied@...il.com, daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
	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, akpm@...ux-foundation.org,
	gregkh@...uxfoundation.org, adobriyan@...il.com,
	jani.nikula@...el.com
Subject: Re: [PATCH v7 8/8] gpu: ipu-v3: Use generic macro for rounding to
 nearest multiple

On Fri, May 10, 2024 at 06:03:52PM +0300, Andy Shevchenko wrote:
> On Fri, May 10, 2024 at 12:10:10AM +0530, Devarsh Thakkar wrote:
> > Use generic macro round_closest_up for rounding to nearest multiple instead
> 
> round_closest_up()
> 
> We refer to the functions as func().
> 
> > of using local function.
> 
> ...
> 
> > @@ -565,7 +563,7 @@ static void find_best_seam(struct ipu_image_convert_ctx *ctx,
> >  		 * The closest input sample position that we could actually
> >  		 * start the input tile at, 19.13 fixed point.
> >  		 */
> > -		in_pos_aligned = round_closest(in_pos, 8192U * in_align);
> > +		in_pos_aligned = round_closest_up(in_pos, 8192U * in_align);
> >  		/* Convert 19.13 fixed point to integer */
> >  		in_pos_rounded = in_pos_aligned / 8192U;
> 
> Oh, these seems to be better to use either ALIGN*(), or PFN_*() / PAGE_*()
> families of macros. What the semantic of 8192 is?

The comment mentions 19.13 fixed point, so I assume that's the
fractional part of the integer. It doesn't seem related to pages.

-- 
Regards,

Laurent Pinchart