diff --git a/libs/ui/GraphicBufferMapper.cpp b/libs/ui/GraphicBufferMapper.cpp
index 320b6c0..01acdc8 100644
--- a/libs/ui/GraphicBufferMapper.cpp
+++ b/libs/ui/GraphicBufferMapper.cpp
@@ -20,7 +20,12 @@
 #include <stdint.h>
 #include <errno.h>
 
+// We would eliminate the non-conforming zero-length array, but we can't since
+// this is effectively included from the Linux kernel
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wzero-length-array"
 #include <sync/sync.h>
+#pragma clang diagnostic pop
 
 #include <utils/Errors.h>
 #include <utils/Log.h>
@@ -44,7 +49,7 @@
     int err = hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module);
     ALOGE_IF(err, "FATAL: can't find the %s module", GRALLOC_HARDWARE_MODULE_ID);
     if (err == 0) {
-        mAllocMod = (gralloc_module_t const *)module;
+        mAllocMod = reinterpret_cast<gralloc_module_t const *>(module);
     }
 }
 
@@ -72,13 +77,13 @@
     return err;
 }
 
-status_t GraphicBufferMapper::lock(buffer_handle_t handle, 
-        int usage, const Rect& bounds, void** vaddr)
+status_t GraphicBufferMapper::lock(buffer_handle_t handle,
+        uint32_t usage, const Rect& bounds, void** vaddr)
 {
     ATRACE_CALL();
     status_t err;
 
-    err = mAllocMod->lock(mAllocMod, handle, usage,
+    err = mAllocMod->lock(mAllocMod, handle, static_cast<int>(usage),
             bounds.left, bounds.top, bounds.width(), bounds.height(),
             vaddr);
 
@@ -87,12 +92,12 @@
 }
 
 status_t GraphicBufferMapper::lockYCbCr(buffer_handle_t handle,
-        int usage, const Rect& bounds, android_ycbcr *ycbcr)
+        uint32_t usage, const Rect& bounds, android_ycbcr *ycbcr)
 {
     ATRACE_CALL();
     status_t err;
 
-    err = mAllocMod->lock_ycbcr(mAllocMod, handle, usage,
+    err = mAllocMod->lock_ycbcr(mAllocMod, handle, static_cast<int>(usage),
             bounds.left, bounds.top, bounds.width(), bounds.height(),
             ycbcr);
 
@@ -112,19 +117,19 @@
 }
 
 status_t GraphicBufferMapper::lockAsync(buffer_handle_t handle,
-        int usage, const Rect& bounds, void** vaddr, int fenceFd)
+        uint32_t usage, const Rect& bounds, void** vaddr, int fenceFd)
 {
     ATRACE_CALL();
     status_t err;
 
     if (mAllocMod->common.module_api_version >= GRALLOC_MODULE_API_VERSION_0_3) {
-        err = mAllocMod->lockAsync(mAllocMod, handle, usage,
+        err = mAllocMod->lockAsync(mAllocMod, handle, static_cast<int>(usage),
                 bounds.left, bounds.top, bounds.width(), bounds.height(),
                 vaddr, fenceFd);
     } else {
         sync_wait(fenceFd, -1);
         close(fenceFd);
-        err = mAllocMod->lock(mAllocMod, handle, usage,
+        err = mAllocMod->lock(mAllocMod, handle, static_cast<int>(usage),
                 bounds.left, bounds.top, bounds.width(), bounds.height(),
                 vaddr);
     }
@@ -134,19 +139,19 @@
 }
 
 status_t GraphicBufferMapper::lockAsyncYCbCr(buffer_handle_t handle,
-        int usage, const Rect& bounds, android_ycbcr *ycbcr, int fenceFd)
+        uint32_t usage, const Rect& bounds, android_ycbcr *ycbcr, int fenceFd)
 {
     ATRACE_CALL();
     status_t err;
 
     if (mAllocMod->common.module_api_version >= GRALLOC_MODULE_API_VERSION_0_3) {
-        err = mAllocMod->lockAsync_ycbcr(mAllocMod, handle, usage,
-                bounds.left, bounds.top, bounds.width(), bounds.height(),
-                ycbcr, fenceFd);
+        err = mAllocMod->lockAsync_ycbcr(mAllocMod, handle,
+                static_cast<int>(usage), bounds.left, bounds.top,
+                bounds.width(), bounds.height(), ycbcr, fenceFd);
     } else {
         sync_wait(fenceFd, -1);
         close(fenceFd);
-        err = mAllocMod->lock_ycbcr(mAllocMod, handle, usage,
+        err = mAllocMod->lock_ycbcr(mAllocMod, handle, static_cast<int>(usage),
                 bounds.left, bounds.top, bounds.width(), bounds.height(),
                 ycbcr);
     }