linux-kernel - Re: [PATCH 1/1] VIDEO: console, use DIV_ROUND

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Message-ID: <4A890E33.2080302@gmail.com>
Date:	Mon, 17 Aug 2009 10:00:51 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
CC:	akpm@...ux-foundation.org, andi@...stfloor.org,
	rpjday@...shcourse.ca, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] VIDEO: console, use DIV_ROUND_UP

On 08/17/2009 10:00 AM, Sergey Senozhatsky wrote:
> So... In general, ((vc->vc_font.width + 7) >> 3) ==  DIV_ROUND_UP(vc->vc_font.width, 8) - 1;

?

#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))

DIV_ROUND_UP(vc->vc_font.width, 8) expands to:
(((vc->vc_font.width) + (8) - 1) / (8))
which is pretty printed:
(vc->vc_font.width + 7) / 8
and that's equivalent to:
(vc->vc_font.width + 7) >> 3

Correct?

> Are you sure we really can use DIV_ROUND_UP?

Yeah, pretty sure.
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