[Patch 2/2] Kexec/Kdump support - POWER6

[Sachin P. Sant]

On Power machines supporting VRMA, Kexec/Kdump does not work.
Hypervisor stores VRMA mapping used by the OS, in the hpte hash
tables. Make sure these hpte entries are left untouched.

This patch also adds plpar_pte_read_raw() on the lines of 
plpar_pte_remove_raw().

Thanks
-Sachin




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