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This patch forwards port a patch from the Marvell kernel tree.
It dramatically decreases vmeta CPU utilization.
The main reason is that without this patch the vmeta user space driver
(libvmetahal) polled the vmeta engine more than it was required; and
each poll is actually reading a non cached register from the vmeta area
(which has long latency from the processor to the engine).
This is a forward patch, but it's still unclear why it resolves the issue.