diff --git a/include/cutils/atomic-arm64.h b/include/cutils/atomic-arm64.h
index 4562ad0f8..ba5a218ae 100644
--- a/include/cutils/atomic-arm64.h
+++ b/include/cutils/atomic-arm64.h
@@ -46,18 +46,6 @@ void android_compiler_barrier(void)
     __asm__ __volatile__ ("" : : : "memory");
 }
 
-#if ANDROID_SMP == 0
-extern ANDROID_ATOMIC_INLINE
-void android_memory_barrier(void)
-{
-    android_compiler_barrier();
-}
-extern ANDROID_ATOMIC_INLINE
-void android_memory_store_barrier(void)
-{
-    android_compiler_barrier();
-}
-#else
 extern ANDROID_ATOMIC_INLINE
 void android_memory_barrier(void)
 {
@@ -68,7 +56,6 @@ void android_memory_store_barrier(void)
 {
     __asm__ __volatile__ ("dmb ishst" : : : "memory");
 }
-#endif
 
 extern ANDROID_ATOMIC_INLINE
 int32_t android_atomic_acquire_load(volatile const int32_t *ptr)
diff --git a/include/cutils/atomic-mips64.h b/include/cutils/atomic-mips64.h
index 99bbe3a55..6215621e9 100644
--- a/include/cutils/atomic-mips64.h
+++ b/include/cutils/atomic-mips64.h
@@ -28,16 +28,6 @@ extern ANDROID_ATOMIC_INLINE void android_compiler_barrier(void)
     __asm__ __volatile__ ("" : : : "memory");
 }
 
-#if ANDROID_SMP == 0
-extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void)
-{
-    android_compiler_barrier();
-}
-extern ANDROID_ATOMIC_INLINE void android_memory_store_barrier(void)
-{
-    android_compiler_barrier();
-}
-#else
 extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void)
 {
     __asm__ __volatile__ ("sync" : : : "memory");
@@ -46,7 +36,6 @@ extern ANDROID_ATOMIC_INLINE void android_memory_store_barrier(void)
 {
     __asm__ __volatile__ ("sync" : : : "memory");
 }
-#endif
 
 extern ANDROID_ATOMIC_INLINE
 int32_t android_atomic_acquire_load(volatile const int32_t *ptr)
diff --git a/include/cutils/atomic-x86_64.h b/include/cutils/atomic-x86_64.h
index 5b5c203a2..025ba1910 100644
--- a/include/cutils/atomic-x86_64.h
+++ b/include/cutils/atomic-x86_64.h
@@ -41,18 +41,6 @@ void android_compiler_barrier(void)
     __asm__ __volatile__ ("" : : : "memory");
 }
 
-#if ANDROID_SMP == 0
-extern ANDROID_ATOMIC_INLINE
-void android_memory_barrier(void)
-{
-    android_compiler_barrier();
-}
-extern ANDROID_ATOMIC_INLINE
-void android_memory_store_barrier(void)
-{
-    android_compiler_barrier();
-}
-#else
 extern ANDROID_ATOMIC_INLINE
 void android_memory_barrier(void)
 {
@@ -63,7 +51,6 @@ void android_memory_store_barrier(void)
 {
     android_compiler_barrier();
 }
-#endif
 
 extern ANDROID_ATOMIC_INLINE
 int32_t android_atomic_acquire_load(volatile const int32_t *ptr)