[Xen-devel] x86: fix kexec crash regression

[David Vrabel <david.vrabel@xxxxxxxxxx>]

A recent commit causes Xen to crash if a kexec crash images is loaded
into a crash area below 5 TiB (and a non-debug Xen is used).

This series reverts the bad commit and then re-implements the part of
the original fix that does cause a regression.

This is an important bug fix necessary for 4.4.

David


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