On Wed, 20 Dec 2017 09:25:40 +0530
Madhavan Srinivasan [off-list ref] wrote:

Local atomic operations are fast and highly reentrant per CPU counters.
Used for percpu variable updates. Local atomic operations only guarantee
variable modification atomicity wrt the CPU which owns the data and
these needs to be executed in a preemption safe way.

As we've been discussing offline, these are all

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

Thanks,
Nick