Packing alignment for MP_CPU_EXCHANGE_INFO should be 1. This should be typo when
check-in CpuMpPei driver. IA32 arch MP_CPU_EXCHANGE_INFO is luckly pack(1). It
leads CpuMpPei x64 version hung.

Contributed-under: TianoCore Contribution Agreement 1.0
Reported-by: Michael Kinney <[email protected]>
Cc: Feng Tian <[email protected]>
Cc: Michael Kinney <[email protected]>
Cc: Jordan Justen <[email protected]>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <[email protected]>
---
 UefiCpuPkg/CpuMpPei/CpuMpPei.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/UefiCpuPkg/CpuMpPei/CpuMpPei.h b/UefiCpuPkg/CpuMpPei/CpuMpPei.h
index f2286b9..2460f4a 100644
--- a/UefiCpuPkg/CpuMpPei/CpuMpPei.h
+++ b/UefiCpuPkg/CpuMpPei/CpuMpPei.h
@@ -72,7 +72,7 @@ typedef struct {
 
 typedef struct _PEI_CPU_MP_DATA  PEI_CPU_MP_DATA;
 
-#pragma pack()
+#pragma pack(1)
 
 typedef union {
   struct {
-- 
1.9.5.msysgit.0

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