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powerpc: Don't use a 16G page if beyond mem= limits
If mem= is used on the boot command line to limit memory then the memory block where a 16G page resides may not be available. Thanks to Michael Ellerman for finding the problem. Signed-off-by: Jon Tollefson <kniht@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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