Hm, I am not sure if I understand the above question correctly. Could you elaborate please?
I am sorry for the unclear statement! I meaned that how a kernel thread create a user thread. For example, the device drivers can call call_usermodehelper() to create a user thread. As I traced, the call_usermodehelper() use the work queues mechanism, which would call kernel_tread() to new a kernel thread, then the new kernel thread call execve() loading the /sbin/hotplug. The things puzzled me is that since the new kernel thread has no mm struct, how it become a user thread? Thanks ! Regard, Cheng -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
