Re: [RFC] Are you good with Lockdep?

[Boqun Feng]

Hi Matthew,

On Mon, Nov 16, 2020 at 03:37:29PM +0000, Matthew Wilcox wrote:
[...]
> 
> It's not just about lockdep for semaphores.  Mutexes will spin if the
> current owner is still running, so to convert an interrupt-released
> semaphore to a mutex, we need a way to mark the mutex as being released

Could you provide an example for the conversion from interrupt-released
semaphore to a mutex? I'd like to see if we can improve lockdep to help
on that case.

Regards,
Boqun

> by the new owner.
> 
> I really don't think you want to report subsequent lockdep splats.