Kthread kill

[John Baldwin]

On Wednesday 03 September 2008 05:32:00 am kr Lekha wrote:
> Hi,
> i wanted to kill a kthread created by my module, There is no actual
> kthread_kill to kill it
>
> hence I tried to send kill signal to thread
>  psignal(p, SIGTERM);
> psignal(p, SIGKILL);
> killproc(p,"messeage");
> and kthread_suspend()
>
> Nothing seems to be killing the kthread, I still see it
> [root@ /usr/src]# ps awx -l | grep kernel
>  UID   PID    PPID CPU PRI NI   VSZ   RSS MWCHAN STAT  TT       TIME
> COMMAND 0     1048     1      0     20   0     0       8      ktsusp     
> DL ??     0:00.01 [new_kernel_thread]
>
>
> I have noticed that generally if kernel module wanted to kill a thread then
> it calls
> {
>    wakeup(p);
>    msleep(p,0); /*or tsleep*/
> }
>
> This puts the thread to sleep forever. However kthread_suspend also
> performs same actions.

Your kthread has to explicitly check for a kill request in its main loop and 
call kthread_exit() or some such.  There is no force-kill for kthreads.

-- 
John Baldwin