linux-kernel - Re: memset as memzero

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Message-ID: <Pine.LNX.4.64.0709220441090.21302@localhost.localdomain>
Date:	Sat, 22 Sep 2007 04:48:28 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: memset as memzero

On Sat, 22 Sep 2007, Cyrill Gorcunov wrote:

> Hi list,
>
> could anyone tell me why there is no official memzero function (or
> macros) in the kernel. As I see a lot of kernel parts calls for it
> (defying own macros as alias to memset). Maybe there is a special
> reason not to do so? Actually my suggestion is to define _one_
> general macros for this.

i brought up this issue on the KJ list once upon a time:

https://lists.linux-foundation.org/pipermail/kernel-janitors/2007-February/017847.html

and there didn't seem to be much enthusiasm for it.

  however, i am still curious why there isn't more use of the
already-defined "clear_page" macro.  most architectures appear to
define it:

$ grep -r "define.*clear_page" include

but there are still numerous explicit calls to memset() to zero a
chunk of memory that is exactly PAGE_SIZE in size.  just an
observation.

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://crashcourse.ca
========================================================================
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