diff --git a/libc/private/bionic_atomic_aarch64.h b/libc/private/bionic_atomic_aarch64.h
index c5a9e2e..568382e 100644
--- a/libc/private/bionic_atomic_aarch64.h
+++ b/libc/private/bionic_atomic_aarch64.h
@@ -17,7 +17,7 @@
 #define BIONIC_ATOMIC_AARCH64_H
 
 /* For ARMv8, we can use the 'dmb' instruction directly */
-__ATOMIC_INLINE__ void __bionic_memory_barrier(void) {
+__ATOMIC_INLINE__ void __bionic_memory_barrier() {
   __asm__ __volatile__ ( "dmb ish" : : : "memory" );
 }
 
diff --git a/libc/private/bionic_atomic_arm.h b/libc/private/bionic_atomic_arm.h
index 023d662..2156e6a 100644
--- a/libc/private/bionic_atomic_arm.h
+++ b/libc/private/bionic_atomic_arm.h
@@ -16,9 +16,9 @@
 #ifndef BIONIC_ATOMIC_ARM_H
 #define BIONIC_ATOMIC_ARM_H
 
-__ATOMIC_INLINE__ void __bionic_memory_barrier(void) {
+__ATOMIC_INLINE__ void __bionic_memory_barrier() {
 #if defined(ANDROID_SMP) && ANDROID_SMP == 1
-  __asm__ __volatile__ ( "dmb" : : : "memory" );
+  __asm__ __volatile__ ( "dmb ish" : : : "memory" );
 #else
   /* A simple compiler barrier. */
   __asm__ __volatile__ ( "" : : : "memory" );
diff --git a/libc/private/bionic_atomic_gcc_builtin.h b/libc/private/bionic_atomic_gcc_builtin.h
index 9e5e5aa..70eb861 100644
--- a/libc/private/bionic_atomic_gcc_builtin.h
+++ b/libc/private/bionic_atomic_gcc_builtin.h
@@ -25,7 +25,7 @@
  * the architecture-specific assembler versions.
  */
 
-__ATOMIC_INLINE__ void __bionic_memory_barrier(void) {
+__ATOMIC_INLINE__ void __bionic_memory_barrier() {
   __sync_synchronize();
 }
 
diff --git a/libc/private/bionic_atomic_inline.h b/libc/private/bionic_atomic_inline.h
index 2bb1128..c887e5a 100644
--- a/libc/private/bionic_atomic_inline.h
+++ b/libc/private/bionic_atomic_inline.h
@@ -25,7 +25,7 @@
  *
  * Macros defined in this header:
  *
- * void ANDROID_MEMBAR_FULL(void)
+ * void ANDROID_MEMBAR_FULL()
  *   Full memory barrier.  Provides a compiler reordering barrier, and
  *   on SMP systems emits an appropriate instruction.
  */