From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Jiri Slaby <jirislaby@gmail.com>
Cc: akpm@linux-foundation.org, andi@firstfloor.org,
rpjday@crashcourse.ca, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] VIDEO: console, use DIV_ROUND_UP
Date: Mon, 17 Aug 2009 11:08:53 +0300 [thread overview]
Message-ID: <20090817080853.GC2967@localdomain.by> (raw)
In-Reply-To: <4A890E33.2080302@gmail.com>
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On (08/17/09 10:00), Jiri Slaby wrote:
> 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;
>
> ?
>
Oops, silly me. Somehow I thought about
DIV_ROUND_UP((vc->vc_font.width + 7) , 8). My fault. Sorry.
> #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?
Right.
>
> > Are you sure we really can use DIV_ROUND_UP?
>
> Yeah, pretty sure.
>
OK.
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next prev parent reply other threads:[~2009-08-17 8:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-15 13:43 [PATCH] Make shr to divide by power of 2 (resend) Sergey Senozhatsky
2009-08-15 13:48 ` Jiri Slaby
2009-08-15 13:49 ` Robert P. J. Day
2009-08-15 14:12 ` Sergey Senozhatsky
2009-08-15 20:42 ` Jiri Slaby
2009-08-16 9:14 ` Sergey Senozhatsky
2009-08-17 7:15 ` Jiri Slaby
2009-08-17 7:31 ` Sergey Senozhatsky
2009-08-17 7:48 ` [PATCH 1/1] VIDEO: console, use DIV_ROUND_UP Jiri Slaby
2009-08-17 8:00 ` Sergey Senozhatsky
2009-08-17 8:00 ` Jiri Slaby
2009-08-17 8:08 ` Sergey Senozhatsky [this message]
2009-08-17 8:11 ` Jiri Slaby
2009-08-15 14:26 ` [PATCH] Make shr to divide by power of 2 (resend) Sergey Senozhatsky
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