Re: [RFC][PATCH 6/8] mm: handle_speculative_fault()

[Linus Torvalds]

On Tue, 5 Jan 2010, Al Viro wrote:
> 
> - a bunch of fs operations done from RCU callbacks.  Including severely
> blocking ones.

Yeah, you're right (and Peter also pointed out the might_sleep). That is 
likely to be the really fundamental issue. 

You _can_ handle it (make the RCU callback just schedule the work instead 
of doing it directly), but it does sound really nasty. I suspect we should 
explore just about any other approach over this one. 

			Linus
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