vm changes from linux-2.6.14 to linux-2.6.15

[David Miller]

From: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Date: Thu, 10 May 2007 16:29:43 +1000

> 
> > We never seemed to reach completion here?
> 
> Well, I'm waiting for other people comments too... as I said earlier,
> I'm not too fan of burrying the update_mmu_cache() inside
> ptep_set_access_flags(), but perhaps we could remove the whole logic of
> reading the old PTE & comparing it, and instead have
> ptep_set_access_flags() do that locally and return to the caller wether
> a change occured that requires update_mmu_cache() to be called.
> 
> That way, archs who don't actually need update_mmu_cache() under some
> circumstances will be able to return 0 there.
> 
> What do you guys thing ?

I think that's a good idea.