Index: include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- include/clang/Basic/DiagnosticSemaKinds.td
+++ include/clang/Basic/DiagnosticSemaKinds.td
@@ -8264,6 +8264,9 @@
   "return value cannot be qualified with address space">;
 def err_opencl_constant_no_init : Error<
   "variable in constant address space must be initialized">;
+// Atomics
+def err_atomic_init_addressspace : Error<
+  "initialization of atomic variables is restricted to variables in global address space">;
 def err_atomic_init_constant : Error<
   "atomic variable can only be assigned to a compile time constant"
   " in the declaration statement in the program scope">;
Index: lib/Sema/SemaInit.cpp
===================================================================
--- lib/Sema/SemaInit.cpp
+++ lib/Sema/SemaInit.cpp
@@ -6489,6 +6489,20 @@
       << Init->getSourceRange();
   }
 
+  // OpenCL v2.0 s6.13.11.1. atomic variables can be initialized in global scope
+  QualType ETy = Entity.getType();
+  Qualifiers TyQualifiers = ETy.getQualifiers();
+  bool HasGlobalAS = TyQualifiers.hasAddressSpace() &&
+                     TyQualifiers.getAddressSpace() == LangAS::opencl_global;
+
+  if (S.getLangOpts().OpenCLVersion >= 200 &&
+      ETy->isAtomicType() && !HasGlobalAS &&
+      Entity.getKind() == InitializedEntity::EK_Variable && Args.size() > 0) {
+    S.Diag(Args[0]->getLocStart(), diag::err_atomic_init_addressspace) <<
+    SourceRange(Entity.getDecl()->getLocStart(), Args[0]->getLocEnd());
+    return ExprError();
+  }
+
   // Diagnose cases where we initialize a pointer to an array temporary, and the
   // pointer obviously outlives the temporary.
   if (Args.size() == 1 && Args[0]->getType()->isArrayType() &&
Index: test/SemaOpenCL/atomic-init.cl
===================================================================
--- /dev/null
+++ test/SemaOpenCL/atomic-init.cl
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -O0 -cl-std=CL2.0 -fsyntax-only -verify  %s
+
+global atomic_int a1 = 0;
+
+kernel void test_atomic_initialization() {
+  atomic_int a2 = 0; // expected-error {{initialization of atomic variables is restricted to variables in global address space}}
+  private atomic_int a3 = 0; // expected-error {{initialization of atomic variables is restricted to variables in global address space}}
+  local atomic_int a4 = 0; // expected-error {{'__local' variable cannot have an initializer}}
+  global atomic_int a5 = 0; // expected-error {{function scope variable cannot be declared in global address space}}
+}