Except for MtrrSetAllMtrrs(), others services are not suggested to be invoked by
APs because they are not necessary and may invoke DEBUG() to dump MTRR setting.

Cc: Feng Tian <[email protected]>
Cc: Michael Kinney <[email protected]>
Cc: Laszlo Ersek <[email protected]>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <[email protected]>
---
 UefiCpuPkg/Library/MtrrLib/MtrrLib.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c 
b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
index f667a8f..5aef772 100644
--- a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
+++ b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
@@ -1,6 +1,10 @@
 /** @file
   MTRR setting library
 
+  @par Note: 
+    Most of services in this library instance are suggested to be invoked by 
BSP only,
+    except for MtrrSetAllMtrrs() which is used to sync BSP's MTRR setting to 
APs.
+
   Copyright (c) 2008 - 2016, 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
-- 
2.7.4.windows.1

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