x86/platform/UV: Fix GAM Range Table entries less than 1GB

x86/platform/UV: Fix GAM Range Table entries less than 1GB

[ Upstream commit c25d99d20ba69824a1e2cc118e04b877cd427afc ]

The latest UV platforms include the new ApachePass NVDIMMs into the
UV address space.  This has introduced address ranges in the Global
Address Map Table that are less than the previous lowest range, which
was 2GB.  Fix the address calculation so it accommodates address ranges
from bytes to exabytes.

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Reviewed-by: Andrew Banman <andrew.banman@hpe.com>
Reviewed-by: Dimitri Sivanich <dimitri.sivanich@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russ Anderson <russ.anderson@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180205221503.190219903@stormcage.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>