linux-kernel - Re: [PATCH] bitmap: separate bitmap parsing for user buffer and kernel buffer

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Message-Id: <20061004181003.6dae6065.akpm@osdl.org>
Date:	Wed, 4 Oct 2006 18:10:03 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Reinette Chatre <reinette.chatre@...ux.intel.com>
Cc:	Joe Korty <joe.korty@...r.com>,
	Inaky Perez-Gonzalez <inaky@...ux.intel.com>,
	Paul Jackson <pj@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bitmap: separate bitmap parsing for user buffer and
 kernel buffer

On Wed, 4 Oct 2006 17:56:30 -0700
Reinette Chatre <reinette.chatre@...ux.intel.com> wrote:

> +			if (is_user) {
> +				if (__get_user(c, buf++))
> +					return -EFAULT;
> +			}
> +			else
> +				c = *buf++;

Is this actually needed?  __get_user(kernel_address) works OK and (believe
it or not, given all the stuff it involves) boils down to a single instruction.		
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