usermodehelper: kill the kmod_thread_locker logic
Now that we do not call kernel_thread(CLONE_VFORK) from the worker thread we can not deadlock if do_execve() in turn triggers another call_usermodehelper(), we can remove the kmod_thread_locker code. Note: we should probably kill khelper_wq and simply use one of the global workqueues, say, system_unbound_wq, this special wq for umh buys nothing nowadays. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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