[PATCH 2/2] arm64: set MAX_MEMBLOCK_ADDR according to linear region size

[Russell King - ARM Linux]

On Tue, Aug 18, 2015 at 03:24:36PM +0100, Catalin Marinas wrote:
> With the current memory layout, this could also be __pa(~0UL). I guess
> we could solve this with a single patch, though I'm not sure whether we
> break other architectures:

No.  __pa() is only valid within the lowmem mapping, not outside of it.
What you'd get for a virtual address of ~0UL is not well defined, so
you should not use this in generic code.

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