Re: [PATCH net v6] usbnet: fix smp_processor_id() use in preemptible context

[Jakub Kicinski]

On Thu, 8 Oct 2026 10:16:02 -0400 Alan Stern wrote:
> > This looks odd, how did we miss this for 8 years.
> > 
> > Greg is probably busy, but would be good to get a confirmation
> > from either him or some other USB expert that the callbacks
> > can indeed be called in process context.  
> 
> They can be called in BH context with interrupts enabled.  Is that close 
> enough?

BH should be fine on !RT. The patch, AFAIU, is because vhci calls
the completion callbacks in pure, unadulterated process context.
I'm trying to figure out how urgent the fix is, basically.
If it's a vhci bug then the usbnet fix is at most an RT problem.
Also if vhci is doing something wrong we don't want a truckload
of slop patches sent our way to fix 300 drivers :S