Takashi-san, > I don't see this problem on 2.6.34-rc3. > Did you change CONFIG_SYSFS_DEPRECATED* kconfig between 2.6.33 and 34? Ah yes! Good catch! CONFIG_SYSFS_DEPRECATED=y CONFIG_SYSFS_DEPRECATED_V2=y I was hoping to run the kernel on RHEL 5.4 .. Thanks, Fengguang