linux-kernel - Re: [RFC 2/2] KVM: add virtio-pmem driver

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Date:   Fri, 13 Oct 2017 08:25:59 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Stefan Hajnoczi <stefanha@...il.com>
Cc:     Pankaj Gupta <pagupta@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        KVM list <kvm@...r.kernel.org>,
        Qemu Developers <qemu-devel@...gnu.org>,
        linux-nvdimm <linux-nvdimm@...1.01.org>,
        Linux MM <linux-mm@...ck.org>, Jan Kara <jack@...e.cz>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Haozhong Zhang <haozhong.zhang@...el.com>,
        Nitesh Narayan Lal <nilal@...hat.com>,
        Kevin Wolf <kwolf@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Zwisler, Ross" <ross.zwisler@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>
Subject: Re: [RFC 2/2] KVM: add virtio-pmem driver

On Fri, Oct 13, 2017 at 2:44 AM, Stefan Hajnoczi <stefanha@...il.com> wrote:
> On Thu, Oct 12, 2017 at 09:20:26PM +0530, Pankaj Gupta wrote:
[..]
>> +#ifndef REQ_FLUSH
>> +#define REQ_FLUSH REQ_PREFLUSH
>> +#endif
>
> Is this out-of-tree kernel module compatibility stuff that can be
> removed?

Yes, this was copied from the pmem driver where it can also be
removed, it was used to workaround a merge order problem in linux-next
when these definitions were changed several kernel releases back.