diff --git a/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp b/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp
index de0df40..0bf32b5 100644
--- a/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp
+++ b/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp
@@ -74,6 +74,7 @@
 using ReadStatus = ::android::hardware::audio::V4_0::IStreamIn::ReadStatus;
 using ::android::hardware::audio::V4_0::IStreamOut;
 using ::android::hardware::audio::V4_0::IStreamOutCallback;
+using ::android::hardware::audio::V4_0::MicrophoneInfo;
 using ::android::hardware::audio::V4_0::MmapBufferInfo;
 using ::android::hardware::audio::V4_0::MmapPosition;
 using ::android::hardware::audio::V4_0::ParameterValue;
@@ -478,6 +479,17 @@
 }
 
 //////////////////////////////////////////////////////////////////////////////
+/////////////////////////////// getMicrophones ///////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+
+TEST_F(AudioPrimaryHidlTest, GetMicrophonesTest) {
+    doc::test("Make sure getMicrophones always succeeds");
+    hidl_vec<MicrophoneInfo> microphones;
+    ASSERT_OK(device->getMicrophones(returnIn(res, microphones)));
+    ASSERT_OK(res);
+}
+
+//////////////////////////////////////////////////////////////////////////////
 //////////////////////////////// debugDebug //////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////
 
@@ -1081,6 +1093,14 @@
     ASSERT_OK(stream->updateSinkMetadata(initialMetadata));
 }
 
+TEST_P(InputStreamTest, getActiveMicrophones) {
+    doc::test("Getting active microphones should always succeed");
+    hidl_vec<MicrophoneInfo> microphones;
+    ASSERT_OK(device->getMicrophones(returnIn(res, microphones)));
+    ASSERT_OK(res);
+    ASSERT_TRUE(microphones.size() > 0);
+}
+
 //////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////// StreamOut //////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////
diff --git a/camera/device/3.2/default/CameraDeviceSession.cpp b/camera/device/3.2/default/CameraDeviceSession.cpp
index 60a57cd..1cef882 100644
--- a/camera/device/3.2/default/CameraDeviceSession.cpp
+++ b/camera/device/3.2/default/CameraDeviceSession.cpp
@@ -393,7 +393,11 @@
         return;
     }
 
-    mCallback->notify(batch->mShutterMsgs);
+    auto ret = mCallback->notify(batch->mShutterMsgs);
+    if (!ret.isOk()) {
+        ALOGE("%s: notify shutter transaction failed: %s",
+                __FUNCTION__, ret.description().c_str());
+    }
     batch->mShutterDelivered = true;
     batch->mShutterMsgs.clear();
 }
@@ -563,7 +567,11 @@
 }
 
 void CameraDeviceSession::ResultBatcher::notifySingleMsg(NotifyMsg& msg) {
-    mCallback->notify({msg});
+    auto ret = mCallback->notify({msg});
+    if (!ret.isOk()) {
+        ALOGE("%s: notify transaction failed: %s",
+                __FUNCTION__, ret.description().c_str());
+    }
     return;
 }
 
@@ -654,7 +662,11 @@
             }
         }
     }
-    mCallback->processCaptureResult(results);
+    auto ret = mCallback->processCaptureResult(results);
+    if (!ret.isOk()) {
+        ALOGE("%s: processCaptureResult transaction failed: %s",
+                __FUNCTION__, ret.description().c_str());
+    }
     mProcessCaptureResultLock.unlock();
 }
 
diff --git a/compatibility_matrices/Android.mk b/compatibility_matrices/Android.mk
index ee97433..9e48588 100644
--- a/compatibility_matrices/Android.mk
+++ b/compatibility_matrices/Android.mk
@@ -18,68 +18,64 @@
 
 BUILD_FRAMEWORK_COMPATIBILITY_MATRIX := $(LOCAL_PATH)/compatibility_matrix.mk
 
-# Clear potential input variables to BUILD_FRAMEWORK_COMPATIBILITY_MATRIX
-LOCAL_ADD_VBMETA_VERSION :=
-LOCAL_ASSEMBLE_VINTF_ENV_VARS :=
-LOCAL_ASSEMBLE_VINTF_ENV_VARS_OVERRIDE :=
-LOCAL_ASSEMBLE_VINTF_ERROR_MESSAGE :=
-LOCAL_ASSEMBLE_VINTF_FLAGS :=
-LOCAL_KERNEL_VERSIONS :=
-LOCAL_GEN_FILE_DEPENDENCIES :=
+my_kernel_config_data := kernel/configs
 
 # Install all compatibility_matrix.*.xml to /system/etc/vintf
 
-
 include $(CLEAR_VARS)
+include $(LOCAL_PATH)/clear_vars.mk
 LOCAL_MODULE := framework_compatibility_matrix.legacy.xml
 LOCAL_MODULE_STEM := compatibility_matrix.legacy.xml
 LOCAL_SRC_FILES := $(LOCAL_MODULE_STEM)
-LOCAL_KERNEL_VERSIONS := \
-    3.18.0 \
-    4.4.0 \
-    4.9.0 \
-    4.14.0 \
+LOCAL_KERNEL_CONFIG_DATA_PATHS := \
+    3.18.0:$(my_kernel_config_data)/o/android-3.18 \
+    4.4.0:$(my_kernel_config_data)/o/android-4.4 \
+    4.9.0:$(my_kernel_config_data)/o/android-4.9 \
 
 include $(BUILD_FRAMEWORK_COMPATIBILITY_MATRIX)
 
 include $(CLEAR_VARS)
+include $(LOCAL_PATH)/clear_vars.mk
 LOCAL_MODULE := framework_compatibility_matrix.1.xml
 LOCAL_MODULE_STEM := compatibility_matrix.1.xml
 LOCAL_SRC_FILES := $(LOCAL_MODULE_STEM)
-LOCAL_KERNEL_VERSIONS := \
-    3.18.0 \
-    4.4.0 \
-    4.9.0 \
-    4.14.0 \
+LOCAL_KERNEL_CONFIG_DATA_PATHS := \
+    3.18.0:$(my_kernel_config_data)/o/android-3.18 \
+    4.4.0:$(my_kernel_config_data)/o/android-4.4 \
+    4.9.0:$(my_kernel_config_data)/o/android-4.9 \
 
 include $(BUILD_FRAMEWORK_COMPATIBILITY_MATRIX)
 
 include $(CLEAR_VARS)
+include $(LOCAL_PATH)/clear_vars.mk
 LOCAL_MODULE := framework_compatibility_matrix.2.xml
 LOCAL_MODULE_STEM := compatibility_matrix.2.xml
 LOCAL_SRC_FILES := $(LOCAL_MODULE_STEM)
-LOCAL_KERNEL_VERSIONS := \
-    3.18.0 \
-    4.4.0 \
-    4.9.0 \
-    4.14.0 \
+LOCAL_KERNEL_CONFIG_DATA_PATHS := \
+    3.18.0:$(my_kernel_config_data)/o-mr1/android-3.18 \
+    4.4.0:$(my_kernel_config_data)/o-mr1/android-4.4 \
+    4.9.0:$(my_kernel_config_data)/o-mr1/android-4.9 \
 
 include $(BUILD_FRAMEWORK_COMPATIBILITY_MATRIX)
 
 include $(CLEAR_VARS)
+include $(LOCAL_PATH)/clear_vars.mk
 LOCAL_MODULE := framework_compatibility_matrix.3.xml
 LOCAL_MODULE_STEM := compatibility_matrix.3.xml
 LOCAL_SRC_FILES := $(LOCAL_MODULE_STEM)
-LOCAL_KERNEL_VERSIONS := \
-    4.4.0 \
-    4.9.0 \
-    4.14.0 \
+LOCAL_KERNEL_CONFIG_DATA_PATHS := \
+    4.4.0:$(my_kernel_config_data)/android-4.4 \
+    4.9.0:$(my_kernel_config_data)/android-4.9 \
+    4.14.0:$(my_kernel_config_data)/android-4.14 \
 
 include $(BUILD_FRAMEWORK_COMPATIBILITY_MATRIX)
 
+my_kernel_config_data :=
+
 # Framework Compatibility Matrix (common to all FCM versions)
 
 include $(CLEAR_VARS)
+include $(LOCAL_PATH)/clear_vars.mk
 LOCAL_MODULE := framework_compatibility_matrix.device.xml
 LOCAL_MODULE_STEM := compatibility_matrix.device.xml
 # define LOCAL_MODULE_CLASS for local-generated-sources-dir.
@@ -126,6 +122,7 @@
 # Framework Compatibility Matrix
 
 include $(CLEAR_VARS)
+include $(LOCAL_PATH)/clear_vars.mk
 LOCAL_MODULE := framework_compatibility_matrix.xml
 LOCAL_MODULE_STEM := compatibility_matrix.xml
 LOCAL_MODULE_PATH := $(TARGET_OUT)
diff --git a/compatibility_matrices/clear_vars.mk b/compatibility_matrices/clear_vars.mk
new file mode 100644
index 0000000..8fde301
--- /dev/null
+++ b/compatibility_matrices/clear_vars.mk
@@ -0,0 +1,24 @@
+#
+# Copyright (C) 2017 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Clear input variables to BUILD_FRAMEWORK_COMPATIBILITY_MATRIX
+LOCAL_ADD_VBMETA_VERSION :=
+LOCAL_ASSEMBLE_VINTF_ENV_VARS :=
+LOCAL_ASSEMBLE_VINTF_ENV_VARS_OVERRIDE :=
+LOCAL_ASSEMBLE_VINTF_ERROR_MESSAGE :=
+LOCAL_ASSEMBLE_VINTF_FLAGS :=
+LOCAL_KERNEL_CONFIG_DATA_PATHS :=
+LOCAL_GEN_FILE_DEPENDENCIES :=
diff --git a/compatibility_matrices/compatibility_matrix.mk b/compatibility_matrices/compatibility_matrix.mk
index 6dc2b4f..1b6fd3b 100644
--- a/compatibility_matrices/compatibility_matrix.mk
+++ b/compatibility_matrices/compatibility_matrix.mk
@@ -14,17 +14,6 @@
 # limitations under the License.
 #
 
-###########################################################
-## Remove minor revision from a kernel version. For example,
-## 3.18.0 becomes 3.18.
-## $(1): kernel version
-###########################################################
-define remove-minor-revision
-$(strip $(subst $(space),.,$(wordlist 1,2,$(subst .,$(space),$(strip $(1))))))
-endef
-
-# $(warning $(call remove-minor-revision,3.18.0))
-
 ##### Input Variables:
 # LOCAL_MODULE: required. Module name for the build system.
 # LOCAL_MODULE_CLASS: optional. Default is ETC.
@@ -42,8 +31,8 @@
 # LOCAL_ASSEMBLE_VINTF_ENV_VARS_OVERRIDE: Add a list of environment variables that is local to
 #       assemble_vintf invocation. Format is "VINTF_ENFORCE_NO_UNUSED_HALS=true".
 # LOCAL_ASSEMBLE_VINTF_FLAGS: Add additional command line arguments to assemble_vintf invocation.
-# LOCAL_KERNEL_VERSIONS: Parse kernel configurations and add to the output matrix
-#       (corresponds to <kernel> tags.)
+# LOCAL_KERNEL_CONFIG_DATA_PATHS: Paths to search for kernel config requirements. Format for each is
+#       <kernel version x.y.z>:<path that contains android-base*.cfg>.
 # LOCAL_GEN_FILE_DEPENDENCIES: A list of additional dependencies for the generated file.
 
 ifndef LOCAL_MODULE
@@ -88,14 +77,13 @@
 $(GEN): PRIVATE_ENV_VARS += FRAMEWORK_VBMETA_VERSION
 endif # LOCAL_ADD_VBMETA_VERSION
 
-ifneq (,$(strip $(LOCAL_KERNEL_VERSIONS)))
-$(GEN): PRIVATE_KERNEL_CONFIG_DATA := kernel/configs
-$(GEN): PRIVATE_KERNEL_VERSIONS := $(LOCAL_KERNEL_VERSIONS)
-$(GEN): $(foreach version,$(PRIVATE_KERNEL_VERSIONS),\
-    $(wildcard $(PRIVATE_KERNEL_CONFIG_DATA)/android-$(call remove-minor-revision,$(version))/android-base*.cfg))
-$(GEN): PRIVATE_FLAGS += $(foreach version,$(PRIVATE_KERNEL_VERSIONS),\
-    --kernel=$(version):$(call normalize-path-list,\
-        $(wildcard $(PRIVATE_KERNEL_CONFIG_DATA)/android-$(call remove-minor-revision,$(version))/android-base*.cfg)))
+ifneq (,$(strip $(LOCAL_KERNEL_CONFIG_DATA_PATHS)))
+$(GEN): PRIVATE_KERNEL_CONFIG_DATA_PATHS := $(LOCAL_KERNEL_CONFIG_DATA_PATHS)
+$(GEN): $(foreach pair,$(PRIVATE_KERNEL_CONFIG_DATA_PATHS),\
+    $(wildcard $(call word-colon,2,$(pair))/android-base*.cfg))
+$(GEN): PRIVATE_FLAGS += $(foreach pair,$(PRIVATE_KERNEL_CONFIG_DATA_PATHS),\
+	--kernel=$(call word-colon,1,$(pair)):$(call normalize-path-list,\
+		$(wildcard $(call word-colon,2,$(pair))/android-base*.cfg)))
 endif
 
 my_matrix_src_files := \
@@ -124,15 +112,7 @@
 LOCAL_SRC_FILES :=
 LOCAL_GENERATED_SOURCES :=
 
-LOCAL_ADD_VBMETA_VERSION :=
-LOCAL_ASSEMBLE_VINTF_ENV_VARS :=
-LOCAL_ASSEMBLE_VINTF_ENV_VARS_OVERRIDE :=
-LOCAL_ASSEMBLE_VINTF_ERROR_MESSAGE :=
-LOCAL_ASSEMBLE_VINTF_FLAGS :=
-LOCAL_KERNEL_VERSIONS :=
-LOCAL_GEN_FILE_DEPENDENCIES :=
+include $(LOCAL_PATH)/clear_vars.mk
 my_matrix_src_files :=
 
 include $(BUILD_PREBUILT)
-
-remove-minor-revision :=