Re: [PATCH v4 06/19] irqdomain: Drop revmap mutex

[Thomas Gleixner]

On Mon, Jan 16 2023 at 14:50, Johan Hovold wrote:
> The global irq_domain_mutex is now held in all paths that update the
> revmap structures so there is no longer any need for the revmap mutex.

This can also go after the 3rd race fix, but ...

>  static void irq_domain_clear_mapping(struct irq_domain *domain,
>  				     irq_hw_number_t hwirq)
>  {
> +	lockdep_assert_held(&irq_domain_mutex);

these lockdep asserts want to be part of the [dis]association race
fixes. They are completely unrelated to the removal of the revmap_mutex.

Your race fixes change the locking and you want to ensure that all
callers comply right there, no?

Thanks,

        tglx