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[PATCH 0/5] refcount_t and various related bits

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Hi all,

Here is the refcount_t patch and some related bits that I hacked up the past
few days while playing with it in order to make it generate less aweful code
(on x86_64).

I think we can start by merging the refcount_t and kref patches, the rest can
come later if so desired. New here is the Kconfig knob to turn warnings
off -- it significantly reduces the generated code while still avoiding
the UAF.

I added David Howells because both he and hpa have suggested something like
try_cmpxchg() in the past.

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[PATCH 0/5] refcount_t and various related bits Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100
  [PATCH 4/5] atomic: Introduce atomic_try_cmpxchg() Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100
    Re: [PATCH 4/5] atomic: Introduce atomic_try_cmpxchg() Boqun Feng <boqun.feng@gmail.com> - 2017-02-06 05:30 +0100
      Re: [PATCH 4/5] atomic: Introduce atomic_try_cmpxchg() Boqun Feng <boqun.feng@gmail.com> - 2017-02-06 07:40 +0100
      Re: [PATCH 4/5] atomic: Introduce atomic_try_cmpxchg() Peter Zijlstra <peterz@infradead.org> - 2017-02-06 09:20 +0100
  [PATCH 2/5] kref: Implement using refcount_t Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100
    Re: [PATCH 2/5] kref: Implement using refcount_t Greg KH <gregkh@linuxfoundation.org> - 2017-02-06 14:10 +0100
  [PATCH 5/5] refcount: Use atomic_try_cmpxchg() Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100
  [PATCH 1/5] refcount_t: A special purpose refcount type Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100
    Re: [PATCH 1/5] refcount_t: A special purpose refcount type Kees Cook <keescook@chromium.org> - 2017-02-03 19:10 +0100
    Re: [PATCH 1/5] refcount_t: A special purpose refcount type Kees Cook <keescook@chromium.org> - 2017-02-04 00:40 +0100
  [PATCH 3/5] x86: Implement __WARN using UD2 Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100

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