On Thu, Apr 06 2023 at 09:56, Ye Bin wrote:
> From: Ye Bin <yebin10@xxxxxxxxxx>
>
> Introduce '__num_dying_cpus' variable to cache the number of dying CPUs
> in the core and just return the cached variable.
Why?
That atomic counter is racy too if read and acted upon w/o having CPUs
read locked.
All it does is making the race window smaller vs. the cpumask_weight()
based implementation. It's still racy and incorrect.
So no, this is not going to happen.
Thanks,
tglx
