linux-kernel - Re: [PATCH 4/6] xfs: use memdup

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Date:	Thu, 09 Apr 2009 08:43:33 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Roland Dreier <rdreier@...co.com>
CC:	Christoph Hellwig <hch@...radead.org>, felixb@....com,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, xfs@....sgi.com
Subject: Re: [PATCH 4/6] xfs: use memdup_user()

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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