Re: [PATCH RT] nvdimm: make lane acquirement RT aware

[Sebastian Andrzej Siewior]

On 2019-03-06 17:57:09 [+0800], Yongxin Liu wrote:
> In this change, we replace get_cpu/put_cpu with local_lock_cpu/
> local_unlock_cpu, and introduce per CPU variable "ndl_local_lock".
> Due to preemption on RT, this lock can avoid race condition for the
> same lane on the same CPU. When CPU number is greater than the lane
> number, lane can be shared among CPUs. "ndl_lock->lock" is used to
> protect the lane in this situation.

so what was the reason that get_cpu() can't be replaced with
raw_smp_processor_id()?

Sebastian