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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 17 Aug 2009 11:08:53 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Jiri Slaby <jirislaby@...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 (08/17/09 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.
Download attachment "signature.asc" of type "application/pgp-signature" (316 bytes)