diff --git a/llvm/include/llvm/Frontend/OpenMP/OMPKinds.def b/llvm/include/llvm/Frontend/OpenMP/OMPKinds.def
--- a/llvm/include/llvm/Frontend/OpenMP/OMPKinds.def
+++ b/llvm/include/llvm/Frontend/OpenMP/OMPKinds.def
@@ -475,6 +475,7 @@
 #define ParamAttrs(...) ArrayRef<AttributeSet>({__VA_ARGS__})
 #define EnumAttr(Kind) Attribute::get(Ctx, Attribute::AttrKind::Kind)
 #define EnumAttrInt(Kind, N) Attribute::get(Ctx, Attribute::AttrKind::Kind, N)
+#define AllocSizeAttr(N, M) Attribute::getWithAllocSizeArgs(Ctx, N, M)
 #define AttributeSet(...)                                                      \
   AttributeSet::get(Ctx, ArrayRef<Attribute>({__VA_ARGS__}))
 
@@ -908,8 +909,10 @@
 __OMP_RTL_ATTRS(__kmpc_doacross_fini, BarrierAttrs, AttributeSet(),
                 ParamAttrs(ReadOnlyPtrAttrs))
 
-__OMP_RTL_ATTRS(__kmpc_alloc_shared, DeviceAllocAttrs, ReturnPtrAttrs,
-                ParamAttrs())
+__OMP_RTL_ATTRS(__kmpc_alloc_shared, AttributeSet(
+  EnumAttr(NoUnwind),
+  EnumAttr(NoSync), 
+  AllocSizeAttr(0, None)), ReturnPtrAttrs, ParamAttrs())
 __OMP_RTL_ATTRS(__kmpc_free_shared, DeviceAllocAttrs, AttributeSet(),
                 ParamAttrs(NoCaptureAttrs))
 
diff --git a/llvm/test/Transforms/OpenMP/spmdization.ll b/llvm/test/Transforms/OpenMP/spmdization.ll
--- a/llvm/test/Transforms/OpenMP/spmdization.ll
+++ b/llvm/test/Transforms/OpenMP/spmdization.ll
@@ -2392,7 +2392,7 @@
 ; AMDGPU: attributes #[[ATTR1]] = { convergent norecurse nounwind }
 ; AMDGPU: attributes #[[ATTR2]] = { nounwind }
 ; AMDGPU: attributes #[[ATTR3:[0-9]+]] = { nosync nounwind }
-; AMDGPU: attributes #[[ATTR4:[0-9]+]] = { nofree nosync nounwind }
+; AMDGPU: attributes #[[ATTR4:[0-9]+]] = { nofree nosync nounwind allocsize(0) }
 ; AMDGPU: attributes #[[ATTR5]] = { convergent "llvm.assume"="ompx_spmd_amenable" }
 ; AMDGPU: attributes #[[ATTR6]] = { convergent }
 ; AMDGPU: attributes #[[ATTR7:[0-9]+]] = { argmemonly nofree nosync nounwind willreturn }
@@ -2403,7 +2403,7 @@
 ; NVPTX: attributes #[[ATTR1]] = { convergent norecurse nounwind }
 ; NVPTX: attributes #[[ATTR2]] = { nounwind }
 ; NVPTX: attributes #[[ATTR3:[0-9]+]] = { nosync nounwind }
-; NVPTX: attributes #[[ATTR4:[0-9]+]] = { nofree nosync nounwind }
+; NVPTX: attributes #[[ATTR4:[0-9]+]] = { nofree nosync nounwind allocsize(0) }
 ; NVPTX: attributes #[[ATTR5]] = { convergent "llvm.assume"="ompx_spmd_amenable" }
 ; NVPTX: attributes #[[ATTR6]] = { convergent }
 ; NVPTX: attributes #[[ATTR7:[0-9]+]] = { argmemonly nofree nosync nounwind willreturn }
@@ -2414,7 +2414,7 @@
 ; AMDGPU-DISABLED: attributes #[[ATTR1]] = { convergent norecurse nounwind }
 ; AMDGPU-DISABLED: attributes #[[ATTR2]] = { nounwind }
 ; AMDGPU-DISABLED: attributes #[[ATTR3:[0-9]+]] = { nosync nounwind }
-; AMDGPU-DISABLED: attributes #[[ATTR4:[0-9]+]] = { nofree nosync nounwind }
+; AMDGPU-DISABLED: attributes #[[ATTR4:[0-9]+]] = { nofree nosync nounwind allocsize(0) }
 ; AMDGPU-DISABLED: attributes #[[ATTR5]] = { convergent "llvm.assume"="ompx_spmd_amenable" }
 ; AMDGPU-DISABLED: attributes #[[ATTR6]] = { convergent }
 ; AMDGPU-DISABLED: attributes #[[ATTR7:[0-9]+]] = { argmemonly nofree nosync nounwind willreturn }
@@ -2425,7 +2425,7 @@
 ; NVPTX-DISABLED: attributes #[[ATTR1]] = { convergent norecurse nounwind }
 ; NVPTX-DISABLED: attributes #[[ATTR2]] = { nounwind }
 ; NVPTX-DISABLED: attributes #[[ATTR3:[0-9]+]] = { nosync nounwind }
-; NVPTX-DISABLED: attributes #[[ATTR4:[0-9]+]] = { nofree nosync nounwind }
+; NVPTX-DISABLED: attributes #[[ATTR4:[0-9]+]] = { nofree nosync nounwind allocsize(0) }
 ; NVPTX-DISABLED: attributes #[[ATTR5]] = { convergent "llvm.assume"="ompx_spmd_amenable" }
 ; NVPTX-DISABLED: attributes #[[ATTR6]] = { convergent }
 ; NVPTX-DISABLED: attributes #[[ATTR7:[0-9]+]] = { argmemonly nofree nosync nounwind willreturn }