答复: [????] Re: [PATCH][net-next] net/mlx5: Expedite notifier unregistration during device teardown

[Li,Rongqing(ACG CCN)]

> On Thu, 12 Mar 2026 05:48:04 -0400 lirongqing wrote:
> > During device hot-unplug, the mlx5 driver expects quickly unregister
> > notification chains. The standard atomic_notifier_chain_unregister()
> > calls synchronize_rcu(), which introduces significant latency and can
> > become a bottleneck during mass resource cleanup.
> >
> > Introduce atomic_notifier_chain_unregister_expedited() to leverage
> > synchronize_rcu_expedited(), and use it significantly reducing wait
> > times in the following paths:
> >  - Event Queue (EQ) notifier chain
> >  - Firmware event notifier chain
> >  - IRQ notifier chain
> >
> > This acceleration ensures faster teardown during hot-unplug events.
> 
> Some detailed example and how long the whole operation takes would be great
> in the commit msg.
> 
OK, I will add in v2 
> >  /**
> > + *	atomic_notifier_chain_unregister_expedited - Remove notifier from an
> atomic notifier chain
> > + *	@nh: Pointer to head of the atomic notifier chain
> > + *	@n: Entry to remove from notifier chain
> > + *
> > + *	Removes a notifier from an atomic notifier chain and forcefully
> > + *	accelerates the RCU grace period.
> > + *
> > + *	Returns zero on success or %-ENOENT on failure.
> 
> Warning: kernel/notifier.c:211 No description found for return value of
> 'atomic_notifier_chain_unregister_expedited'
> 
> kdoc wants you to use Return: or Returns: the colon is how it knows this is the
> doc for return value not just a random mention of the word Returns
> --
I will fix this in v2

Thank you

[Li,Rongqing] 

> pw-bot: cr