[PATCH] MdeModulePkg/Stall: Refine to compare 2 values with the same type

[Hao Wu <hao.a.wu@intel.com>]

Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
---
 MdeModulePkg/Core/Dxe/Misc/Stall.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/MdeModulePkg/Core/Dxe/Misc/Stall.c b/MdeModulePkg/Core/Dxe/Misc/Stall.c
index 73e9078..95a5615 100644
--- a/MdeModulePkg/Core/Dxe/Misc/Stall.c
+++ b/MdeModulePkg/Core/Dxe/Misc/Stall.c
@@ -1,7 +1,7 @@
 /** @file
   UEFI Miscellaneous boot Services Stall service implementation
 
-Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -67,7 +67,7 @@ CoreStall (
   // Counter = Microseconds * 10 / gMetronome->TickPeriod
   // 0x1999999999999999 = (2^64 - 1) / 10
   //
-  if (Microseconds > 0x1999999999999999ULL) {
+  if ((UINT64) Microseconds > 0x1999999999999999ULL) {
     //
     // Microseconds is too large to multiple by 10 first.  Perform the divide 
     // operation first and loop 10 times to avoid 64-bit math overflow.
-- 
1.9.5.msysgit.0