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Date: Thu, 09 Apr 2009 08:43:33 +0800
From: Li Zefan <lizf@cn.fujitsu.com>
MIME-Version: 1.0
Subject: Re: [PATCH 4/6] xfs: use memdup_user()
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To: Roland Dreier <rdreier@cisco.com>
Cc: Christoph Hellwig <hch@infradead.org>, Andrew Morton <akpm@linux-foundation.org>, LKML <linux-kernel@vger.kernel.org>, xfs@oss.sgi.com

Roland Dreier wrote:
>  > wouldn't NULL be a better error return for this kind of interface,
>  > matching kmalloc?
> 
> I guess returning an error code from memdup_user() lets callers
> distinguish between ENOMEM and EFAULT.  Not sure if that's important or
> not but there probably are at least some sites that care.
> 

Right, and this API is simlilar to strndup_user().

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