diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index 86d34ebe87f..cb324be2e62 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -193,6 +193,9 @@ Release 2.8.0 - UNRELEASED
     HADOOP-12036. Consolidate all of the cmake extensions in one directory
     (alanburlison via cmccabe)
 
+    HADOOP-12112. Make hadoop-common-project Native code -Wall-clean
+    (alanburlison via cmccabe)
+
   BUG FIXES
 
     HADOOP-11802: DomainSocketWatcher thread terminates sometimes after there
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/nativeio/NativeIO.c b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/nativeio/NativeIO.c
index 071d8300026..bc78ab2bc0a 100644
--- a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/nativeio/NativeIO.c
+++ b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/nativeio/NativeIO.c
@@ -592,6 +592,7 @@ done:
 #else
   THROW(env, "java/io/IOException",
     "The function Windows.createFileWithMode0() is not supported on this platform");
+  return NULL;
 #endif
 }
 
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/net/unix/DomainSocket.c b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/net/unix/DomainSocket.c
index 55ab0c3e4ca..a3f27ee4d0d 100644
--- a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/net/unix/DomainSocket.c
+++ b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/net/unix/DomainSocket.c
@@ -112,9 +112,9 @@ static jthrowable newSocketException(JNIEnv *env, int errnum,
  * to the heap if necessary.
  */
 struct flexibleBuffer {
-  int8_t *curBuf;
-  int8_t *allocBuf;
-  int8_t stackBuf[8196];
+  jbyte *curBuf;
+  jbyte *allocBuf;
+  jbyte stackBuf[8196];
 };
 
 static jthrowable flexBufInit(JNIEnv *env, struct flexibleBuffer *flexBuf, jint length)
@@ -637,7 +637,7 @@ JNIEnv *env, jclass clazz, jint fd)
  * @return               NULL on success; or the unraised exception representing
  *                       the problem.
  */
-static jthrowable write_fully(JNIEnv *env, int fd, int8_t *buf, int amt)
+static jthrowable write_fully(JNIEnv *env, int fd, jbyte *buf, int amt)
 {
   int err, res;
 
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/NativeCrc32.c b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/NativeCrc32.c
index 74e09e6b2b8..3fceb02742f 100644
--- a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/NativeCrc32.c
+++ b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/NativeCrc32.c
@@ -168,7 +168,7 @@ JNIEXPORT void JNICALL Java_org_apache_hadoop_util_NativeCrc32_nativeComputeChun
   // Setup complete. Actually verify checksums.
   ret = bulk_crc(data, data_len, sums, crc_type,
                             bytes_per_checksum, verify ? &error_data : NULL);
-  if (likely(verify && ret == CHECKSUMS_VALID || !verify && ret == 0)) {
+  if (likely((verify && ret == CHECKSUMS_VALID) || (!verify && ret == 0))) {
     return;
   } else if (unlikely(verify && ret == INVALID_CHECKSUM_DETECTED)) {
     long pos = base_pos + (error_data.bad_data - data);
@@ -261,7 +261,7 @@ JNIEXPORT void JNICALL Java_org_apache_hadoop_util_NativeCrc32_nativeComputeChun
         env, error_data.got_crc, error_data.expected_crc,
         j_filename, pos);
       return;
-    } else if (unlikely(verify && ret != CHECKSUMS_VALID || !verify && ret != 0)) {
+    } else if (unlikely((verify && ret != CHECKSUMS_VALID) || (!verify && ret != 0))) {
       THROW(env, "java/lang/AssertionError",
         "Bad response code from native bulk_crc");
       return;