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

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Date:   Wed, 2 Oct 2019 11:04:44 -0400
From:   Nitesh Narayan Lal <nitesh@...hat.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.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 4:51 PM, Dave Hansen wrote:
> 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?

I do have it in the function which returns the pages to the buddy but I missed
it in the function that isolates the pages.
I will correct this.


-- 
Thanks
Nitesh