kthreads: simplify the startup synchronization

We use two completions two create the kernel thread, this is a bit ugly.
kthread() wakes up create_kthread() via ->started, then create_kthread()
wakes up the caller kthread_create() via ->done.  But kthread() does not
need to wait for kthread(), it can just return.  Instead kthread() itself
can wake up the caller of kthread_create().

Kill kthread_create_info->started, ->done is enough.  This improves the
scalability a bit and sijmplifies the code.

The only problem if kernel_thread() fails, in that case create_kthread()
must do complete(&create->done).

Signed-off-by: Oleg Nesterov <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Pavel Emelyanov <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Vitaliy Gusev <[email protected]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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