[RFC PATCH v2 01/11] MdeModulePkg/Variable: replace all uses of AsmLfence with MemoryFence

[Jagadeesh Ujja <jagadeesh.ujja@arm.com>]

Replace all uses of AsmLfence with call to MemoryFence to allow
variable service code to be platform independent.

Change-Id: I578719ab038318bd240ec5471d42552c8b7c75db
Signed-off-by: Jagadeesh Ujja <jagadeesh.ujja@arm.com>
Signed-off-by: Thomas Abraham <thomas.abraham@arm.com>
---
 .../Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.c   | 4 ++--
 MdeModulePkg/Universal/Variable/RuntimeDxe/LoadFenceSmm.c     | 2 +-
 MdePkg/Library/BaseLib/X86MemoryFence.c                       | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.c b/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.c
index 27fcab19b6..fabd713c74 100644
--- a/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.c
+++ b/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.c
@@ -419,11 +419,11 @@ SmmFaultTolerantWriteHandler (
                  );
       if (!EFI_ERROR (Status)) {
         //
-        // The AsmLfence() call here is to ensure the previous range/content
+        // The MemoryFence () call here is to ensure the previous range/content
         // checks for the CommBuffer have been completed before calling into
         // FtwWrite().
         //
-        AsmLfence ();
+        MemoryFence ();
         Status = FtwWrite(
                    &mFtwDevice->FtwInstance,
                    SmmFtwWriteHeader->Lba,
diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/LoadFenceSmm.c b/MdeModulePkg/Universal/Variable/RuntimeDxe/LoadFenceSmm.c
index 4b0d7e3e95..7c4b01924e 100644
--- a/MdeModulePkg/Universal/Variable/RuntimeDxe/LoadFenceSmm.c
+++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/LoadFenceSmm.c
@@ -26,5 +26,5 @@ MemoryLoadFence (
   VOID
   )
 {
-  AsmLfence ();
+  MemoryFence ();
 }
diff --git a/MdePkg/Library/BaseLib/X86MemoryFence.c b/MdePkg/Library/BaseLib/X86MemoryFence.c
index 77e1c5a4dd..3a7928df9b 100644
--- a/MdePkg/Library/BaseLib/X86MemoryFence.c
+++ b/MdePkg/Library/BaseLib/X86MemoryFence.c
@@ -28,5 +28,5 @@ MemoryFence (
   VOID
   )
 {
-  return;
+  AsmLfence ();
 }
-- 
2.19.1