What about nested qspinlocks?

Posted Jul 20, 2019 17:36 UTC (Sat) by firolwn (guest, #96711)
In reply to: What about nested qspinlocks? by luto
Parent article: MCS locks and qspinlocks

According to https://lkml.org/lkml/2019/1/10/799, NMI and MCE should never use spinlock.

There might be a problem in following scenario:
Process context, soft interrupt, hardware interrupt, page fault(e.g. vmalloc), kprobe.