On Gwe, 2004-04-23 at 18:52, Ian Romanick wrote:
> I'm not too familiar with __user.  What is it's purpose?  Is it only 
> meaningful when building in the kernel? 

It identifies a pointer as being to user not kernel data. That means
you can then do checks that it is only accessed through the right
functionality and not trusted.

So for multi platform code __user becomes a blank define on BSD unless
they start using the same verifier techniques



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