I have to port a driver from 2.6.18 to 3.8.3 Look at the below declaration of current http://lxr.free-electrons.com/source/scripts/kconfig/gconf.c#L62 Where struct menu is http://lxr.free-electrons.com/source/scripts/kconfig/expr.h#L159 The above one is in kconfig while the lower one is in the kernel. So would they be able to affect each other? I guess NO NOW in the driver to be ported- current is defined as: struct task_struct *task = current; but is still able to excess the field members of task_struct http://lxr.linux.no/linux+v2.6.18/include/linux/sched.h#L767 like attr.ia_uid = current->uid; attr.ia_gid = current->gid; though it has not been initialized or assigned or typecasted to this task_struct. HOW? I searched on the entire lxr but could not find the solution. Kindly help. PS: This driver is built on 2.6.28 kernel so use lxr from 2.6.18 kernel only like http://lxr.linux.no/linux+v2.6.18/<http://lxr.linux.no/linux+v2.6.18/include/linux/sched.h#L767>