On Fri, 21 Mar 2008, Andi Kleen wrote:

quoted text
> The traditional reason this was discouraged (people seem to reinvent
> variants of this patch all the time) was that there used 
> to be drivers that did __pa() (or equivalent) on stack addresses
> and that doesn't work with vmalloc pages.
> 
> I don't know if such drivers still exist, but such a change
> is certainly not a no-brainer

I thought that had been cleaned up because some arches already have 
virtually mapped stacks? This could be debugged by testing with
CONFIG_VFALLBACK_ALWAYS set. Which results in a stack that is always 
vmalloc'ed and thus the driver should fail.


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