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SubjectRe: [11/14] vcompound: Fallbacks for order 1 stack allocations on IA64 and x86
On Fri, 21 Mar 2008, Andi Kleen wrote:

> 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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