On Friday 07 August 2015 08:27 PM, Peter Zijlstra wrote:
> 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.
Doesn't help my cause - ipi_data_ptr is not atomic_t - hence my prev question in
this thread
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