arm64: Add cast for virt_to_pfn
virt_to_pfn lacks a cast at the top level. Don't rely on __virt_to_phys and explicitly cast to unsigned long. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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