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

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Date:   Tue, 1 Oct 2019 13:51:54 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Nitesh Narayan Lal <nitesh@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        virtio-dev@...ts.oasis-open.org, kvm@...r.kernel.org,
        mst@...hat.com, linux-kernel@...r.kernel.org, willy@...radead.org,
        mhocko@...nel.org, linux-mm@...ck.org, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net, vbabka@...e.cz, osalvador@...e.de
Cc:     yang.zhang.wz@...il.com, pagupta@...hat.com,
        konrad.wilk@...cle.com, riel@...riel.com, lcapitulino@...hat.com,
        wei.w.wang@...el.com, aarcange@...hat.com, pbonzini@...hat.com,
        dan.j.williams@...el.com
Subject: Re: [PATCH v11 0/6] mm / virtio: Provide support for unused page
 reporting

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?