update the comment in kthread_stop()
Commit 63706172 ("kthreads: rework kthread_stop()") removed the limitation that the thread function mysr not call do_exit() itself, but forgot to update the comment. Since that commit it is OK to use kthread_stop() even if kthread can exit itself. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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