Messages in this thread | | | Date | Tue, 14 Jul 2015 13:38:01 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 1/5] atomics: add acquire/release/relaxed variants of some atomic operations |
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On Tue, Jul 14, 2015 at 12:31:47PM +0100, Will Deacon wrote: > #ifndef atomic_add > #define atomic_add(args...) (void)atomic_add_return_relaxed(args); > > It would mean a new architecture only has to define a barrier instruction > and a handful of relaxed atomics for a bare-minimum atomic.h avoiding > spinlocks.
Look at include/asm-generic/atomic.h, all you need is a cmpxchg().
We could easily change that to be cmpxchg_relaxed() and a few barriers.
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