diff --git a/clang/include/clang/Basic/OpenCLExtensions.def b/clang/include/clang/Basic/OpenCLExtensions.def
--- a/clang/include/clang/Basic/OpenCLExtensions.def
+++ b/clang/include/clang/Basic/OpenCLExtensions.def
@@ -110,6 +110,7 @@
 OPENCL_OPTIONALCOREFEATURE(__opencl_c_generic_address_space, false, 300, OCL_C_30)
 OPENCL_OPTIONALCOREFEATURE(__opencl_c_atomic_order_acq_rel, false, 300, OCL_C_30)
 OPENCL_OPTIONALCOREFEATURE(__opencl_c_atomic_order_seq_cst, false, 300, OCL_C_30)
+OPENCL_OPTIONALCOREFEATURE(__opencl_c_atomic_scope_all_devices, false, 300, OCL_C_30)
 OPENCL_OPTIONALCOREFEATURE(__opencl_c_subgroups, false, 300, OCL_C_30)
 OPENCL_OPTIONALCOREFEATURE(__opencl_c_3d_image_writes, false, 300, OCL_C_30)
 OPENCL_OPTIONALCOREFEATURE(__opencl_c_device_enqueue, false, 300, OCL_C_30)
diff --git a/clang/lib/Headers/opencl-c-base.h b/clang/lib/Headers/opencl-c-base.h
--- a/clang/lib/Headers/opencl-c-base.h
+++ b/clang/lib/Headers/opencl-c-base.h
@@ -312,7 +312,12 @@
   memory_scope_work_item = __OPENCL_MEMORY_SCOPE_WORK_ITEM,
   memory_scope_work_group = __OPENCL_MEMORY_SCOPE_WORK_GROUP,
   memory_scope_device = __OPENCL_MEMORY_SCOPE_DEVICE,
+#if defined(__opencl_c_atomic_scope_all_devices)
   memory_scope_all_svm_devices = __OPENCL_MEMORY_SCOPE_ALL_SVM_DEVICES,
+#if (__OPENCL_C_VERSION__ >= CL_VERSION_3_0)
+  memory_scope_all_devices = memory_scope_all_svm_devices,
+#endif // __OPENCL_C_VERSION__ >= CL_VERSION_3_0
+#endif // defined(__opencl_c_atomic_scope_all_devices)
 #if defined(cl_intel_subgroups) || defined(cl_khr_subgroups)
   memory_scope_sub_group = __OPENCL_MEMORY_SCOPE_SUB_GROUP
 #endif
diff --git a/clang/test/SemaOpenCL/atomic-ops.cl b/clang/test/SemaOpenCL/atomic-ops.cl
--- a/clang/test/SemaOpenCL/atomic-ops.cl
+++ b/clang/test/SemaOpenCL/atomic-ops.cl
@@ -2,6 +2,7 @@
 // RUN:   -fsyntax-only -triple=spir64 -fdeclare-opencl-builtins -finclude-default-header
 // RUN: %clang_cc1 %s -cl-std=CL2.0 -verify -fsyntax-only \
 // RUN:   -triple=amdgcn-amd-amdhsa -fdeclare-opencl-builtins -finclude-default-header
+// TODO: add -cl-std=CL3.0 line when generic and psv are supported.
 
 // Basic parsing/Sema tests for __opencl_atomic_*
 
@@ -161,6 +162,11 @@
   (void)__opencl_atomic_load(Ap, memory_order_relaxed, memory_scope_work_group);
   (void)__opencl_atomic_load(Ap, memory_order_relaxed, memory_scope_device);
   (void)__opencl_atomic_load(Ap, memory_order_relaxed, memory_scope_all_svm_devices);
+  (void)__opencl_atomic_load(Ap, memory_order_relaxed, memory_scope_all_devices);
+#if __OPENCL_C_VERSION__ < CL_VERSION_3_0
+  // expected-error@-2{{use of undeclared identifier 'memory_scope_all_devices'}}
+  // expected-note@* {{'memory_scope_all_svm_devices' declared here}}
+#endif
   (void)__opencl_atomic_load(Ap, memory_order_relaxed, memory_scope_sub_group);
   (void)__opencl_atomic_load(Ap, memory_order_relaxed, scope);
   (void)__opencl_atomic_load(Ap, memory_order_relaxed, 10);    //expected-error{{synchronization scope argument to atomic operation is invalid}}