local64_cmpxchg() in arc_perf_event_update()

[Vineet Gupta]

On Tuesday 17 November 2015 05:55 PM, Peter Zijlstra wrote:
> On Tue, Nov 17, 2015 at 01:24:01PM +0100, Peter Zijlstra wrote:
>> > On Tue, Nov 17, 2015 at 04:53:04PM +0530, Vineet Gupta wrote:
>>> > > That means Alexey need to revert the hunk ?
>> > 
>> > Yes, I think so.
> This is assuming you now have these NMIs we talked about earlier. If all
> you have are regular IRQs this is not possible, for we should be calling
> ->read() with IRQs disabled.

Ok then there is not need for this change ATM. I'll queue up the revert in the
branch which brings NMI support !

Thx,
-Vineet