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What does __user do?

To: kernelnewbies@xxxxxxxxxxxx
Subject: What does __user do?
From: Peter Poulsen <peter@xxxxxxxxx>
Date: Fri, 07 Dec 2007 10:28:53 +0100
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I have noticed __user in some code, when a pointer points to userspace code. What does that do exaclty?

/peter


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