diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4253caaa..271888f6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,7 +17,6 @@ endif()
 include(GNUInstallDirs)
 include(CMakeParseArguments)
 include(Kbuild)
-include(Ksym)
 include(CheckCCompilerFlag)
 
 set(CFLAGS_WARNINGS "-Wall -Wextra -Wno-unused-parameter -Wno-sign-compare -Wno-unused-function")
@@ -106,23 +105,6 @@ list(GET LINUX_VERSION 2 LINUX_VERSION_PATCH)
 list(GET LINUX_VERSION 3 LINUX_VERSION_RELEASE)
 math(EXPR LINUX_VERSION_CODE "${LINUX_VERSION_MAJOR} * 65536 + ${LINUX_VERSION_MINOR} * 256 + ${LINUX_VERSION_PATCH}")
 
-ksym(sys_mount PREFIX MCCTRL_)
-ksym(sys_umount PREFIX MCCTRL_)
-ksym(sys_unshare PREFIX MCCTRL_)
-ksym(zap_page_range PREFIX MCCTRL_)
-ksym(vdso_image_64 PREFIX MCCTRL_)
-ksym(vdso_start PREFIX MCCTRL_)
-ksym(vdso_end PREFIX MCCTRL_)
-ksym(vdso_pages PREFIX MCCTRL_)
-ksym(__vvar_page PREFIX MCCTRL_)
-ksym(hpet_address PREFIX MCCTRL_)
-# POSTK_DEBUG_ARCH_DEP_50, add:find kernel symbol.
-ksym(vdso_spec PREFIX MCCTRL_)
-ksym(hv_clock PREFIX MCCTRL_)
-ksym(sys_readlink PREFIX MCCTRL_)
-ksym(walk_page_range PREFIX MCCTRL_)
-
-
 # compat with various install paths
 set(MCKERNEL_LIBDIR ${CMAKE_INSTALL_FULL_LIBDIR})
 set(BINDIR ${CMAKE_INSTALL_FULL_BINDIR})
diff --git a/ihk b/ihk
index 1e0d4276..7828636f 160000
--- a/ihk
+++ b/ihk
@@ -1 +1 @@
-Subproject commit 1e0d4276f86ea7271c4d9873ae6cb206ff7418a3
+Subproject commit 7828636f98787d543411499ae0133a56e40d46a7