Re: Problem with WARN_ON in mutex_trylock() and rxrpc

[Sebastian Andrzej Siewior]

On 2019-12-10 20:25:38 [+0100], Peter Zijlstra wrote:
> AFAICT the only assumption it relies on are:
> 
>  - that the softirq will cleanly preempt a task. That is, the task
>    context must not change under the softirq execution.
> 
>  - that the softirq runs non-preemptible.
> 
> Now, both these properties are rather fundamental to how our softirqs
> work. And can, therefore, be relied upon, irrespective of the mutex
> implementation.

softirq is preemptible on -RT (I think you know that already but just in
case).

Sebastian