Re: [11/14] vcompound: Fallbacks for order 1 stack allocations onIA64 and x86

[David Miller]

From: Christoph Lameter <clameter@xxxxxxx>
Date: Thu, 20 Mar 2008 23:17:14 -0700

> This allows fallback for order 1 stack allocations. In the fallback
> scenario the stacks will be virtually mapped.
> 
> Signed-off-by: Christoph Lameter <clameter@xxxxxxx>

I would be very careful with this especially on IA64.

If the TLB miss or other low-level trap handler depends upon being
able to dereference thread info, task struct, or kernel stack stuff
without causing a fault outside of the linear PAGE_OFFSET area, this
patch will cause problems.

It will be difficult to debug the kinds of crashes this will cause
too.
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