diff --git a/libutils/BlobCache.cpp b/libutils/BlobCache.cpp
index 126995b8c..b0fdd44b5 100644
--- a/libutils/BlobCache.cpp
+++ b/libutils/BlobCache.cpp
@@ -17,13 +17,10 @@
 #define LOG_TAG "BlobCache"
 //#define LOG_NDEBUG 0
 
-#include <inttypes.h>
-#include <stdlib.h>
-#include <string.h>
-
 #include <utils/BlobCache.h>
-#include <utils/Errors.h>
-#include <utils/Log.h>
+#include <utils/Timers.h>
+
+#include <inttypes.h>
 
 #include <cutils/properties.h>
 
diff --git a/libutils/CallStack.cpp b/libutils/CallStack.cpp
index 699da7469..bd6015e79 100644
--- a/libutils/CallStack.cpp
+++ b/libutils/CallStack.cpp
@@ -16,9 +16,10 @@
 
 #define LOG_TAG "CallStack"
 
+#include <utils/CallStack.h>
+
 #include <memory>
 
-#include <utils/CallStack.h>
 #include <utils/Printer.h>
 #include <utils/Errors.h>
 #include <utils/Log.h>
diff --git a/libutils/LinearTransform.cpp b/libutils/LinearTransform.cpp
index 138ce8be7..d2e91a868 100644
--- a/libutils/LinearTransform.cpp
+++ b/libutils/LinearTransform.cpp
@@ -16,10 +16,9 @@
 
 #define __STDC_LIMIT_MACROS
 
-#include <assert.h>
-#include <stdint.h>
-
 #include <utils/LinearTransform.h>
+#include <assert.h>
+
 
 // disable sanitize as these functions may intentionally overflow (see comments below).
 // the ifdef can be removed when host builds use clang.
diff --git a/libutils/Log.cpp b/libutils/Log.cpp
index bffb56eda..2c1fb86b9 100644
--- a/libutils/Log.cpp
+++ b/libutils/Log.cpp
@@ -21,14 +21,14 @@
 
 namespace android {
 
-LogIfSlow::LogIfSlow(const char* tag, android_LogPriority priority,
-        int timeoutMillis, const char* message) :
-        mTag(tag), mPriority(priority), mTimeoutMillis(timeoutMillis), mMessage(message),
-        mStart(systemTime(SYSTEM_TIME_BOOTTIME)) {
+LogIfSlow::LogIfSlow(
+        const char* tag, android_LogPriority priority, int timeoutMillis, const char* message)
+        : mTag(tag), mPriority(priority), mTimeoutMillis(timeoutMillis), mMessage(message),
+          mStart(systemTime(SYSTEM_TIME_BOOTTIME)) {
 }
 
 LogIfSlow::~LogIfSlow() {
-    int durationMillis = nanoseconds_to_milliseconds(systemTime(SYSTEM_TIME_BOOTTIME) - mStart);
+    int durationMillis = (int)nanoseconds_to_milliseconds(systemTime(SYSTEM_TIME_BOOTTIME) - mStart);
     if (durationMillis > mTimeoutMillis) {
         LOG_PRI(mPriority, mTag, "%s: %dms", mMessage, durationMillis);
     }
diff --git a/libutils/Looper.cpp b/libutils/Looper.cpp
index 84bc028f8..6c57b2e54 100644
--- a/libutils/Looper.cpp
+++ b/libutils/Looper.cpp
@@ -13,17 +13,8 @@
 // Debugs callback registration and invocation.
 #define DEBUG_CALLBACKS 0
 
-#include <errno.h>
-#include <fcntl.h>
-#include <inttypes.h>
-#include <limits.h>
-#include <string.h>
-#include <sys/eventfd.h>
-#include <unistd.h>
-
-#include <log/log.h>
 #include <utils/Looper.h>
-#include <utils/Timers.h>
+#include <sys/eventfd.h>
 
 namespace android {
 
diff --git a/libutils/NativeHandle.cpp b/libutils/NativeHandle.cpp
index e4daca7ff..97d06b8bd 100644
--- a/libutils/NativeHandle.cpp
+++ b/libutils/NativeHandle.cpp
@@ -19,14 +19,14 @@
 
 namespace android {
 
-sp<NativeHandle> NativeHandle::create(
-        native_handle_t* handle, bool ownsHandle) {
+sp<NativeHandle> NativeHandle::create(native_handle_t* handle, bool ownsHandle) {
     return handle ? new NativeHandle(handle, ownsHandle) : NULL;
 }
 
 NativeHandle::NativeHandle(native_handle_t* handle, bool ownsHandle)
-:   mHandle(handle), mOwnsHandle(ownsHandle)
-{}
+        : mHandle(handle), mOwnsHandle(ownsHandle) {
+
+}
 
 NativeHandle::~NativeHandle() {
     if (mOwnsHandle) {
diff --git a/libutils/Printer.cpp b/libutils/Printer.cpp
index 98cd2c66a..9573a10c4 100644
--- a/libutils/Printer.cpp
+++ b/libutils/Printer.cpp
@@ -21,10 +21,6 @@
 #include <utils/String8.h>
 #include <utils/Log.h>
 
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-
 namespace android {
 
 /*
diff --git a/libutils/ProcessCallStack.cpp b/libutils/ProcessCallStack.cpp
index 73ed4ebef..1d9f30dc7 100644
--- a/libutils/ProcessCallStack.cpp
+++ b/libutils/ProcessCallStack.cpp
@@ -17,18 +17,11 @@
 #define LOG_TAG "ProcessCallStack"
 // #define LOG_NDEBUG 0
 
-#include <dirent.h>
-#include <errno.h>
-#include <stdio.h>
-#include <string.h>
-#include <memory>
-
-#include <utils/Log.h>
-#include <utils/Errors.h>
 #include <utils/ProcessCallStack.h>
-#include <utils/Printer.h>
 
-#include <limits.h>
+#include <dirent.h>
+
+#include <utils/Printer.h>
 
 namespace android {
 
diff --git a/libutils/PropertyMap.cpp b/libutils/PropertyMap.cpp
index 55207027b..4bcdd0f7f 100644
--- a/libutils/PropertyMap.cpp
+++ b/libutils/PropertyMap.cpp
@@ -16,11 +16,7 @@
 
 #define LOG_TAG "PropertyMap"
 
-#include <stdlib.h>
-#include <string.h>
-
 #include <utils/PropertyMap.h>
-#include <utils/Log.h>
 
 // Enables debug output for the parser.
 #define DEBUG_PARSER 0
diff --git a/libutils/RefBase.cpp b/libutils/RefBase.cpp
index 4252ba6b2..0d98db949 100644
--- a/libutils/RefBase.cpp
+++ b/libutils/RefBase.cpp
@@ -17,18 +17,9 @@
 #define LOG_TAG "RefBase"
 // #define LOG_NDEBUG 0
 
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
 #include <utils/RefBase.h>
 
 #include <utils/CallStack.h>
-#include <utils/Log.h>
-#include <utils/threads.h>
 
 #ifndef __unused
 #define __unused __attribute__((__unused__))
diff --git a/libutils/SharedBuffer.cpp b/libutils/SharedBuffer.cpp
index 1fa1d7a54..bad98b274 100644
--- a/libutils/SharedBuffer.cpp
+++ b/libutils/SharedBuffer.cpp
@@ -16,13 +16,13 @@
 
 #define LOG_TAG "sharedbuffer"
 
+#include "SharedBuffer.h"
+
 #include <stdlib.h>
 #include <string.h>
 
 #include <log/log.h>
 
-#include "SharedBuffer.h"
-
 // ---------------------------------------------------------------------------
 
 namespace android {
diff --git a/libutils/StopWatch.cpp b/libutils/StopWatch.cpp
index 8c7b59645..219c13c67 100644
--- a/libutils/StopWatch.cpp
+++ b/libutils/StopWatch.cpp
@@ -16,9 +16,7 @@
 
 #define LOG_TAG "StopWatch"
 
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
+#include <utils/StopWatch.h>
 
 /* for PRId64 */
 #ifndef __STDC_FORMAT_MACROS
@@ -27,8 +25,6 @@
 #include <inttypes.h>
 
 #include <utils/Log.h>
-#include <utils/Errors.h>
-#include <utils/StopWatch.h>
 
 /*****************************************************************************/
 
diff --git a/libutils/String16.cpp b/libutils/String16.cpp
index 9f5cfeab4..12bb7c454 100644
--- a/libutils/String16.cpp
+++ b/libutils/String16.cpp
@@ -17,12 +17,6 @@
 #include <utils/String16.h>
 
 #include <utils/Log.h>
-#include <utils/Unicode.h>
-#include <utils/threads.h>
-
-#include <memory.h>
-#include <stdio.h>
-#include <ctype.h>
 
 #include "SharedBuffer.h"
 
diff --git a/libutils/String8.cpp b/libutils/String8.cpp
index cacaf91b8..0ac39f919 100644
--- a/libutils/String8.cpp
+++ b/libutils/String8.cpp
@@ -21,11 +21,7 @@
 
 #include <utils/Compat.h>
 #include <utils/Log.h>
-#include <utils/Unicode.h>
 #include <utils/String16.h>
-#include <utils/threads.h>
-
-#include <ctype.h>
 
 #include "SharedBuffer.h"
 
diff --git a/libutils/SystemClock.cpp b/libutils/SystemClock.cpp
index 965e32c0f..28fc35145 100644
--- a/libutils/SystemClock.cpp
+++ b/libutils/SystemClock.cpp
@@ -19,17 +19,17 @@
  * System clock functions.
  */
 
+#define LOG_TAG "SystemClock"
+
+#include <utils/SystemClock.h>
+
 #include <sys/time.h>
-#include <limits.h>
-#include <fcntl.h>
 #include <string.h>
 #include <errno.h>
 
 #include <cutils/compiler.h>
-#include <utils/SystemClock.h>
-#include <utils/Timers.h>
 
-#define LOG_TAG "SystemClock"
+#include <utils/Timers.h>
 #include <utils/Log.h>
 
 namespace android {
diff --git a/libutils/Threads.cpp b/libutils/Threads.cpp
index def739f9f..6317c32d4 100644
--- a/libutils/Threads.cpp
+++ b/libutils/Threads.cpp
@@ -18,16 +18,10 @@
 #define LOG_TAG "libutils.threads"
 
 #include <assert.h>
-#include <errno.h>
-#include <memory.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
+#include <utils/Thread.h>
+#include <utils/AndroidThreads.h>
 
 #if !defined(_WIN32)
-# include <pthread.h>
-# include <sched.h>
 # include <sys/resource.h>
 #else
 # include <windows.h>
@@ -40,7 +34,6 @@
 #include <sys/prctl.h>
 #endif
 
-#include <utils/threads.h>
 #include <utils/Log.h>
 
 #include <cutils/sched_policy.h>
diff --git a/libutils/Timers.cpp b/libutils/Timers.cpp
index 201bc412c..b2df9a58f 100644
--- a/libutils/Timers.cpp
+++ b/libutils/Timers.cpp
@@ -20,7 +20,6 @@
 #include <utils/Timers.h>
 
 #include <limits.h>
-#include <sys/time.h>
 #include <time.h>
 
 #if defined(__ANDROID__)
@@ -53,7 +52,7 @@ nsecs_t systemTime(int /*clock*/)
 
 int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime)
 {
-    int timeoutDelayMillis;
+    nsecs_t timeoutDelayMillis;
     if (timeoutTime > referenceTime) {
         uint64_t timeoutDelay = uint64_t(timeoutTime - referenceTime);
         if (timeoutDelay > uint64_t((INT_MAX - 1) * 1000000LL)) {
@@ -64,5 +63,5 @@ int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime)
     } else {
         timeoutDelayMillis = 0;
     }
-    return timeoutDelayMillis;
+    return (int)timeoutDelayMillis;
 }
diff --git a/libutils/Tokenizer.cpp b/libutils/Tokenizer.cpp
index 2d0e83dcd..b68a2cfa3 100644
--- a/libutils/Tokenizer.cpp
+++ b/libutils/Tokenizer.cpp
@@ -16,14 +16,10 @@
 
 #define LOG_TAG "Tokenizer"
 
-#include <stdlib.h>
-#include <unistd.h>
+#include <utils/Tokenizer.h>
 #include <fcntl.h>
-#include <errno.h>
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <utils/Log.h>
-#include <utils/Tokenizer.h>
 
 // Enables debug output for the tokenizer.
 #define DEBUG_TOKENIZER 0
diff --git a/libutils/Trace.cpp b/libutils/Trace.cpp
index 36fd80214..8530fdca0 100644
--- a/libutils/Trace.cpp
+++ b/libutils/Trace.cpp
@@ -14,12 +14,11 @@
  * limitations under the License.
  */
 
-#include <utils/misc.h>
 #include <utils/Trace.h>
+#include <utils/misc.h>
 
 static void traceInit() __attribute__((constructor));
 
-static void traceInit()
-{
+static void traceInit() {
     ::android::add_sysprop_change_callback(atrace_update_tags, 0);
 }
diff --git a/libutils/Unicode.cpp b/libutils/Unicode.cpp
index f1a41b96f..5fd915524 100644
--- a/libutils/Unicode.cpp
+++ b/libutils/Unicode.cpp
@@ -16,11 +16,10 @@
 
 #define LOG_TAG "unicode"
 
+#include <utils/Unicode.h>
 #include <limits.h>
-#include <stddef.h>
 
 #include <log/log.h>
-#include <utils/Unicode.h>
 
 #if defined(_WIN32)
 # undef  nhtol
diff --git a/libutils/VectorImpl.cpp b/libutils/VectorImpl.cpp
index f7ca8f4f9..ef3277f42 100644
--- a/libutils/VectorImpl.cpp
+++ b/libutils/VectorImpl.cpp
@@ -16,13 +16,13 @@
 
 #define LOG_TAG "Vector"
 
+#include <utils/VectorImpl.h>
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include <log/log.h>
-#include <utils/Errors.h>
-#include <utils/VectorImpl.h>
 
 #include <safe_iop.h>
 
diff --git a/libutils/include/utils/BlobCache.h b/libutils/include/utils/BlobCache.h
index 65dca9fb4..27a81e3c0 100644
--- a/libutils/include/utils/BlobCache.h
+++ b/libutils/include/utils/BlobCache.h
@@ -19,10 +19,8 @@
 
 #include <stddef.h>
 
-#include <utils/Flattenable.h>
 #include <utils/RefBase.h>
 #include <utils/SortedVector.h>
-#include <utils/threads.h>
 
 namespace android {
 
diff --git a/libutils/include/utils/NativeHandle.h b/libutils/include/utils/NativeHandle.h
index b82516879..73fe804cc 100644
--- a/libutils/include/utils/NativeHandle.h
+++ b/libutils/include/utils/NativeHandle.h
@@ -24,7 +24,7 @@ typedef struct native_handle native_handle_t;
 
 namespace android {
 
-class NativeHandle: public LightRefBase<NativeHandle> {
+class NativeHandle : public LightRefBase<NativeHandle> {
 public:
     // Create a refcounted wrapper around a native_handle_t, and declare
     // whether the wrapper owns the handle (so that it should clean up the
@@ -41,7 +41,7 @@ private:
     friend class LightRefBase<NativeHandle>;
 
     NativeHandle(native_handle_t* handle, bool ownsHandle);
-    virtual ~NativeHandle();
+    ~NativeHandle();
 
     native_handle_t* mHandle;
     bool mOwnsHandle;
diff --git a/libutils/include/utils/RefBase.h b/libutils/include/utils/RefBase.h
index 36016cde6..a61ea58f4 100644
--- a/libutils/include/utils/RefBase.h
+++ b/libutils/include/utils/RefBase.h
@@ -371,10 +371,8 @@ protected:
 
 private:
     friend class ReferenceMover;
-    inline static void renameRefs(size_t /*n*/,
-            const ReferenceRenamer& /*renamer*/) { }
-    inline static void renameRefId(T* /*ref*/,
-            const void* /*old_id*/ , const void* /*new_id*/) { }
+    inline static void renameRefs(size_t /*n*/, const ReferenceRenamer& /*renamer*/) { }
+    inline static void renameRefId(T* /*ref*/, const void* /*old_id*/ , const void* /*new_id*/) { }
 
 private:
     mutable std::atomic<int32_t> mCount;
diff --git a/libutils/include/utils/Singleton.h b/libutils/include/utils/Singleton.h
index a989a4703..bdb2332cf 100644
--- a/libutils/include/utils/Singleton.h
+++ b/libutils/include/utils/Singleton.h
@@ -18,9 +18,12 @@
 #define ANDROID_UTILS_SINGLETON_H
 
 #include <stdint.h>
+
+// some vendor code assumes they have atoi() after including this file.
+#include <stdlib.h>
+
 #include <sys/types.h>
 #include <utils/Mutex.h>
-#include <utils/threads.h>
 #include <cutils/compiler.h>
 
 namespace android {
diff --git a/libutils/include/utils/StrongPointer.h b/libutils/include/utils/StrongPointer.h
index 294e6b6f4..cdfdd8ac6 100644
--- a/libutils/include/utils/StrongPointer.h
+++ b/libutils/include/utils/StrongPointer.h
@@ -17,12 +17,6 @@
 #ifndef ANDROID_STRONG_POINTER_H
 #define ANDROID_STRONG_POINTER_H
 
-#include <cutils/atomic.h>
-
-#include <stdint.h>
-#include <sys/types.h>
-#include <stdlib.h>
-
 // ---------------------------------------------------------------------------
 namespace android {
 
diff --git a/libutils/include/utils/Trace.h b/libutils/include/utils/Trace.h
index eeba40d65..5e9229c1e 100644
--- a/libutils/include/utils/Trace.h
+++ b/libutils/include/utils/Trace.h
@@ -19,16 +19,8 @@
 
 #if defined(__ANDROID__)
 
-#include <fcntl.h>
 #include <stdint.h>
-#include <stdio.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
 
-#include <cutils/compiler.h>
-#include <utils/threads.h>
 #include <cutils/trace.h>
 
 // See <cutils/trace.h> for more ATRACE_* macros.
@@ -37,6 +29,7 @@
 #define _PASTE(x, y) x ## y
 #define PASTE(x, y) _PASTE(x,y)
 #define ATRACE_NAME(name) android::ScopedTrace PASTE(___tracer, __LINE__) (ATRACE_TAG, name)
+
 // ATRACE_CALL is an ATRACE_NAME that uses the current function name.
 #define ATRACE_CALL() ATRACE_NAME(__FUNCTION__)
 
@@ -44,14 +37,13 @@ namespace android {
 
 class ScopedTrace {
 public:
-inline ScopedTrace(uint64_t tag, const char* name)
-    : mTag(tag) {
-    atrace_begin(mTag,name);
-}
+    inline ScopedTrace(uint64_t tag, const char* name) : mTag(tag) {
+        atrace_begin(mTag, name);
+    }
 
-inline ~ScopedTrace() {
-    atrace_end(mTag);
-}
+    inline ~ScopedTrace() {
+        atrace_end(mTag);
+    }
 
 private:
     uint64_t mTag;
diff --git a/libutils/misc.cpp b/libutils/misc.cpp
index 216dc1430..2608a6575 100644
--- a/libutils/misc.cpp
+++ b/libutils/misc.cpp
@@ -22,12 +22,7 @@
 #include <utils/misc.h>
 #include <utils/Log.h>
 
-#include <sys/stat.h>
-#include <string.h>
-#include <stdio.h>
-
 #if !defined(_WIN32)
-# include <pthread.h>
 #endif
 
 #include <utils/Vector.h>