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    SubjectRe: [11/14] vcompound: Fallbacks for order 1 stack allocations on IA64 and x86
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    From: Christoph Lameter <clameter@sgi.com>
    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@sgi.com>

    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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