From: "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>
Move the check that verifies that reservation of fixed area does not
cross HIGHMEM boundary and the actual memblock_resrve() call into a
helper function.
This makes code more readable and decouples logic related to
CONFIG_HIGHMEM from the core functionality of
__cma_declare_contiguous_nid().
Signed-off-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
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