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Directly use max_pfn for max and no one use min, kill them.
Reviewed-by: Vijay Balakrishna <vijayb@linux.microsoft.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Link: https://lore.kernel.org/r/20220411092455.1461-4-wangkefeng.wang@huawei.com

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>