On Fri, Aug 07, 2015 at 08:14:03PM +0530, Vineet Gupta wrote:
> See, I have such a cmpxchg loop in ARC code - originally from Peter :-)
> arch/arc/kernel/smp.c. @ipi_data_ptr is NOT atomic_t
>
> do {
> new = old = ACCESS_ONCE(*ipi_data_ptr);
> new |= 1U << msg;
> } while (cmpxchg(ipi_data_ptr, old, new) != old);
>
Well, you'll have atomic_or() real soon now.
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