Re: [PATCH 4/6] xfs: use memdup_user()

[Roland Dreier]

 > 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.

 - R.
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