Re: [PATCH v11 0/6] mm / virtio: Provide support for unused page reporting

[Dave Hansen]

On 10/1/19 1:49 PM, Alexander Duyck wrote:
> So it looks like v12 still has issues. I'm pretty sure you should be using
> spin_lock_irq(), not spin_lock() in page_reporting.c to avoid the
> possibility of an IRQ firing and causing lock recursion on the zone lock.

Lockdep should make all of this a lot easier to find.  Is it being used?