Re: [patch 2.6.13-rc4] fix get_user_pages bug

[Linus Torvalds <torvalds@osdl.org>]

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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