On Sat, 27 Sep 2014 10:56:57 -0700 Linus Torvalds wrote:

(And Mikhail - I'm not ragging on you, even if I'm ragging on the
patch. I understand why you did it the way you did, and it makes sense
exactly in the "let's reinstate old hackery" model. I just think we
can and should do better than that, now that the "exchange" vs "move
over" semantics are so explicit).

Well, I can't argue with the fact that this patch is ugly, especially
after all this discussion.
I just hope that the right solution will be implemented soon and this
ugly hack will be dropped.

Al (or Mikhail) - willing to do that extra cleanup? Please?

I'll definetly take a look at this, but I doubt that I will be able to
implement the right solution soon. Actually this is the first time when
I look at the kernel code so deeply.
I hope that someone with much more knowledge of the kernel code than my
own (Al or Miklos may be) will do that.

-- 
WBR, Mikhail Efremov