On Wed, 3 Aug 2005, Linus Torvalds wrote:

Ok, I applied this because it was reasonably pretty and I liked the 
approach. It seems buggy, though, since it was using "switch ()" to test 
the bits (wrongly, afaik), and I'm going to apply the appended on top of 
it. Holler quickly if you disagreee..

Another problem I just thought of.

What about PROT_NONE pages? Afaik, they have _exactly_ the same issue on 
the read side as a PROT_READ page has on the write side: pte_read() may 
fail on them.

What makes us not get into an infinite loop there? 

		Linus
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