Re: [PATCH 1/3] rv/reactors: fix lockdep "Invalid wait context" in rv_react()

[Nam Cao]

Wen Yang <wen.yang@xxxxxxxxx> writes:
> How about a context-sensitive approach, eg:
>
>    NMI/hardirq (interrupts masked, scheduler cannot run):
>      Keep LD_WAIT_FREE.  The false positive cannot arise in this path,
>      and the original constraint against raw spinlocks is preserved where
>      it is meaningful.
>
>    task/softirq/PREEMPT_RT irq thread (preemptible):
>      Raise to LD_WAIT_SPIN.  Raw spinlocks become permitted — as Gabriele
>      note, this is a necessary consequence of any fix in this path.

I don't get the point. Unless the lock's type is also context-sensitive,
the reactors still cannot use raw spin locks.

Nam