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[PATCH -v2 00/33] implement atomic_fetch_$op

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As there have been a few requests for atomic_fetch_$op primitives and recently
by Linus, I figured I'd go and implement the lot.

The atomic_fetch_$op differs from the existing atomic_$op_return we already
have by returning the old value instead of the new value. This is especially
useful when the operation is irreversible (like bitops), and allows for things
like test-and-set.

This version incorporates all feedback from last time and is now complete thanks
to Will implementing ARMv8.1-LSE versions.

No known build breakage from the build-bot.

Notes:
 - arc asm/atomic.h is a bit of a mess after the eznps merge, I would
   recommend a restructure or split of that file, but could not find
   the will to do it.
 - arc, metag and tile could convert to _relaxed.

I'm aiming to merge this for v4.8 which should get this a fair few weeks in -next.

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[PATCH -v2 00/33] implement atomic_fetch_$op Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 23/33] locking,tile: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 31/33] locking,mips: Convert to _relaxed atomics Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 01/33] locking,alpha: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 17/33] locking,mn10300: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 07/33] locking,avr32: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 29/33] locking: Remove the deprecated atomic_{set,clear}_mask() functions Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 21/33] locking,sh: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 30/33] locking,alpha: Convert to _relaxed atomics Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 02/33] locking,arc: Implement atomic_fetch_{add,sub,and,andnot,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 08/33] locking,blackfin: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 16/33] locking,mips: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 05/33] arm64: atomic: generate LSE non-return cases using common macros Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 10/33] locking,h8300: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 22/33] locking,sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
    Re: [PATCH -v2 22/33] locking,sparc: Implement  atomic{,64}_fetch_{add,sub,and,or,xor}() David Miller <davem@davemloft.net> - 2016-05-31 20:00 +0200
  [PATCH -v2 12/33] locking,ia64: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 04/33] locking,arm64: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 33/33] locking,rwsem: Employ atomic_long_fetch_add() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 13/33] locking,m32r: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 06/33] locking,arm64: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() for LSE instructions Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 26/33] locking: Fix atomic64_relaxed bits Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 27/33] locking: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:40 +0200
  [PATCH -v2 11/33] locking,hexagon: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:50 +0200
  [PATCH -v2 20/33] locking,s390: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-05-31 12:50 +0200
  Re: [PATCH -v2 00/33] implement atomic_fetch_$op Will Deacon <will.deacon@arm.com> - 2016-06-01 16:10 +0200
  Re: [PATCH -v2 00/33] implement atomic_fetch_$op Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-06-02 11:30 +0200
    Re: [PATCH -v2 00/33] implement atomic_fetch_$op Peter Zijlstra <peterz@infradead.org> - 2016-06-02 11:40 +0200
      Re: [PATCH -v2 00/33] implement atomic_fetch_$op Peter Zijlstra <peterz@infradead.org> - 2016-06-08 14:50 +0200
        Re: [PATCH -v2 00/33] implement atomic_fetch_$op Ingo Molnar <mingo@kernel.org> - 2016-06-08 15:00 +0200
          Re: [PATCH -v2 00/33] implement atomic_fetch_$op Peter Zijlstra <peterz@infradead.org> - 2016-06-08 15:40 +0200
            Re: [PATCH -v2 00/33] implement atomic_fetch_$op Vineet Gupta <vgupta@synopsys.com> - 2016-06-08 16:30 +0200
              Re: [PATCH -v2 00/33] implement atomic_fetch_$op Peter Zijlstra <peterz@infradead.org> - 2016-06-08 16:40 +0200

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