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Date:   Thu, 18 Jul 2019 16:42:50 -0400
From:   "Michael S. Tsirkin" <mst@redhat.com>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Wei Wang <wei.w.wang@intel.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        xdeguillard@vmware.com, namit@vmware.com, pagupta@redhat.com,
        riel@surriel.com, dave.hansen@intel.com, david@redhat.com,
        konrad.wilk@oracle.com, yang.zhang.wz@gmail.com, nitesh@redhat.com,
        lcapitulino@redhat.com, aarcange@redhat.com, pbonzini@redhat.com,
        alexander.h.duyck@linux.intel.com, dan.j.williams@intel.com
Subject: Re: [PATCH v2] mm/balloon_compaction: avoid duplicate page removal
Message-ID: <20190718164152-mutt-send-email-mst@kernel.org>
References: <1563442040-13510-1-git-send-email-wei.w.wang@intel.com>
 <20190718082535-mutt-send-email-mst@kernel.org>
 <20190718133626.e30bec8fc506689b3daf48ee@linux-foundation.org>
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On Thu, Jul 18, 2019 at 01:36:26PM -0700, Andrew Morton wrote:
> On Thu, 18 Jul 2019 08:26:11 -0400 "Michael S. Tsirkin" <mst@redhat.com> wrote:
> 
> > On Thu, Jul 18, 2019 at 05:27:20PM +0800, Wei Wang wrote:
> > > Fixes: 418a3ab1e778 (mm/balloon_compaction: List interfaces)
> > > 
> > > A #GP is reported in the guest when requesting balloon inflation via
> > > virtio-balloon. The reason is that the virtio-balloon driver has
> > > removed the page from its internal page list (via balloon_page_pop),
> > > but balloon_page_enqueue_one also calls "list_del"  to do the removal.
> > > This is necessary when it's used from balloon_page_enqueue_list, but
> > > not from balloon_page_enqueue_one.
> > > 
> > > So remove the list_del balloon_page_enqueue_one, and update some
> > > comments as a reminder.
> > > 
> > > Signed-off-by: Wei Wang <wei.w.wang@intel.com>
> > 
> > 
> > ok I posted v3 with typo fixes. 1/2 is this patch with comment changes. Pls take a look.
> 
> I really have no idea what you're talking about here :(.  Some other
> discussion and patch thread, I suppose.
> 
> You're OK with this patch?

Not exactly. I will send v5 soon, you will be CC'd.

> Should this patch have cc:stable?

Yes. Sorry.