MdePkg/BaseSynchronizationLib: Add volatile Interlocked*() APIs

The SpinLock functions in the SynchronicationLib use volatile
parameters to keep compiler from optimizing these functions
too much.  The volatile keyword is missing from the Interlocked*()
functions in this same library instance.  Update the library instance
to consistently use volatile on all functions in the
SynchronizationLib class.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Andrew Fish <afish@apple.com>
Cc: Jeff Fan <jeff.fan@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange32.nasm b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange32.nasm
index 4c8c8103d9..31142d03c0 100644
--- a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange32.nasm
+++ b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange32.nasm
@@ -1,6 +1,6 @@
 ;------------------------------------------------------------------------------

 ;

-; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>

+; Copyright (c) 2006 - 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

 ; which accompanies this distribution.  The full text of the license may be found at

@@ -28,7 +28,7 @@
 ; UINT32

 ; EFIAPI

 ; InterlockedCompareExchange32 (

-;   IN      UINT32                    *Value,

+;   IN      volatile UINT32           *Value,

 ;   IN      UINT32                    CompareValue,

 ;   IN      UINT32                    ExchangeValue

 ;   );