linux-kernel - Re: [PATCH] bitmap: bitmap_parse takes a kernel buffer instead of a user buffer

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Date:	Wed, 4 Oct 2006 13:14:36 -0400
From:	Joe Korty <joe.korty@...r.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Reinette Chatre <reinette.chatre@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	Inaky Perez-Gonzalez <inaky@...ux.intel.com>,
	Paul Jackson <pj@....com>
Subject: Re: [PATCH] bitmap: bitmap_parse takes a kernel buffer instead of a user buffer

On Wed, Oct 04, 2006 at 09:40:29AM -0700, Andrew Morton wrote:
> I think we can do a version which omits the kmalloc altogether:

> 			if (__get_user(c, ubuf++))
> 				return -EFAULT;
> 
> (Note the s/get_user/__get_user/)

Nice.  This eliminates the bulk of the get_user() overhead.  And
it can be merged into Inaky's enum solution too, for something
that is both simple and efficient.

Joe
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