Re: [PATCH V3] implement `ww_mutex` abstraction for the Rust tree

[Onur <work@onurozkan.dev>]

On Thu, 19 Jun 2025 16:14:01 +0200
Peter Zijlstra <peterz@infradead.org> wrote:

> On Thu, Jun 19, 2025 at 05:06:56PM +0300, Onur Özkan wrote:
> > +bool rust_helper_ww_mutex_is_locked(struct ww_mutex *lock)
> > +{
> > +	return ww_mutex_is_locked(lock);
> > +}
> 
> Do we really need this? In general I dislike all the _is_locked()
> functions and would ideally like to remove them.
> 
> Pretty much the only useful pattern for any of the _is_locked()
> functions is:
> 
>   WARN_ON_ONCE(!foo_is_locked(&foo));
> 
> Any other use is dodgy as heck.
> 
> 

It's an abstraction of `ww_mutex_is_locked`. Since this is an
abstraction module, as long as `ww_mutex_is_locked` exists I think
we should keep it. FWIW it's also quite useful for tests.