[PATCH] UefiCpuPkg/CpuMpPei: suppress compiler complaining

[Jian J Wang <jian.j.wang@intel.com>]

BZ#: https://bugzilla.tianocore.org/show_bug.cgi?id=1166

Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
---
 UefiCpuPkg/CpuMpPei/CpuPaging.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/UefiCpuPkg/CpuMpPei/CpuPaging.c b/UefiCpuPkg/CpuMpPei/CpuPaging.c
index bcb942a8e5..a63421a1af 100644
--- a/UefiCpuPkg/CpuMpPei/CpuPaging.c
+++ b/UefiCpuPkg/CpuMpPei/CpuPaging.c
@@ -517,7 +517,7 @@ GetStackBase (
   IN OUT VOID *Buffer
   )
 {
-  EFI_PHYSICAL_ADDRESS    StackBase;
+  volatile EFI_PHYSICAL_ADDRESS   StackBase;
 
   StackBase = (EFI_PHYSICAL_ADDRESS)(UINTN)&StackBase;
   StackBase += BASE_4KB;
@@ -554,6 +554,8 @@ SetupStackGuardPage (
   MpInitLibGetNumberOfProcessors(&NumberOfProcessors, NULL);
   MpInitLibWhoAmI (&Bsp);
   for (Index = 0; Index < NumberOfProcessors; ++Index) {
+    StackBase = 0;
+
     if (Index == Bsp) {
       Hob.Raw = GetHobList ();
       while ((Hob.Raw = GetNextHob (EFI_HOB_TYPE_MEMORY_ALLOCATION, Hob.Raw)) != NULL) {
@@ -570,12 +572,19 @@ SetupStackGuardPage (
       //
       MpInitLibStartupThisAP(GetStackBase, Index, NULL, 0, (VOID *)&StackBase, NULL);
     }
-    //
-    // Set Guard page at stack base address.
-    //
-    ConvertMemoryPageAttributes(StackBase, EFI_PAGE_SIZE, 0);
-    DEBUG ((DEBUG_INFO, "Stack Guard set at %lx [cpu%lu]!\n",
-            (UINT64)StackBase, (UINT64)Index));
+
+    if (StackBase == 0) {
+      DEBUG ((DEBUG_ERROR, "Stack base address was not found for [cpu%lu]!\n",
+              (UINT64)Index));
+      ASSERT(StackBase != 0);
+    } else {
+      //
+      // Set Guard page at stack base address.
+      //
+      ConvertMemoryPageAttributes(StackBase, EFI_PAGE_SIZE, 0);
+      DEBUG ((DEBUG_INFO, "Stack Guard set at %lx [cpu%lu]!\n",
+              (UINT64)StackBase, (UINT64)Index));
+    }
   }
 
   //
-- 
2.16.2.windows.1