ARM: 8693/1: discard memblock arrays when possible
On ARM the generic pfn_valid() version is used with some configurations such as SA1100 based devices. In that case the memblock arrays are no longer used after boot and can be discarded. Signed-off-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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