2.6.31-git5 kernel boot hangs on powerpc

[Benjamin Herrenschmidt]

On Fri, 2009-09-25 at 18:01 +0900, Tejun Heo wrote:
> > With this patch applied the machine boots OK :-)
> 
> Ah... so, the problem really is too high address.  If you've got some
> time, it might be interesting to find out how far high is safe.
> 
Might give me a clue about what the problem is but I think I'll just
cook up a test case that forcibly vmap something high up and see how it
goes from there. It could be a very old bug that nobody ever noticed
because our vmalloc space on 64-bit is so huge :-)

Cheers,
Ben.