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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
