Re: [RFC][PATCH 02/24] arc: Provide atomic_{or,xor,and}

Vineet Gupta
2015-07-10T04:31:03Z

On Thursday 09 July 2015 11:26 PM, Peter Zijlstra wrote:
> Implement atomic logic ops -- atomic_{or,xor,and}.
>
> These will replace the atomic_{set,clear}_mask functions that are
> available on some archs.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

Acked-by: Vineet Gupta <vgupta@synopsys.com>

Since we are on the topic, the cmpxchg() loop in arch/arc/kernel/smp.c still
irritates me.
Do we need a new set of primitives to operate atomically on non atomic_t data or
does that mean that the data *not* being atomic_t but requiring such semantics is
the fundamental problem and thus needs to be converted first.

-Vineet