Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
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  authenticity information available from domain of
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  receiver=esa4.hc3370-68.iphmx.com;
  envelope-from="roger.pau@citrix.com";
  x-sender="roger.pau@citrix.com";
  x-conformance=sidf_compatible
Received-SPF: Pass (esa4.hc3370-68.iphmx.com: domain of
  roger.pau@citrix.com designates 162.221.158.21 as permitted
  sender) identity=mailfrom; client-ip=162.221.158.21;
  receiver=esa4.hc3370-68.iphmx.com;
  envelope-from="roger.pau@citrix.com";
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  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133
  ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4
  ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88
  ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83
  ip4:168.245.78.127 ~all"
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  postmaster@mail.citrix.com) identity=helo;
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  envelope-from="roger.pau@citrix.com";
  x-sender="postmaster@mail.citrix.com";
  x-conformance=sidf_compatible
IronPort-SDR: Hm12VYnR78F0yIU6Vs5dDAXWyjZEnEngE4KcbEt+L9rMgOvnWLd9+lZvEAq3ooDyIwvLi/XKa8
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Date:   Mon, 9 Dec 2019 12:41:37 +0100
From:   Roger Pau =?iso-8859-1?Q?Monn=E9?= <roger.pau@citrix.com>
To:     Paul Durrant <pdurrant@amazon.com>
CC:     <linux-kernel@vger.kernel.org>, <xen-devel@lists.xenproject.org>,
        "Juergen Gross" <jgross@suse.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        "Boris Ostrovsky" <boris.ostrovsky@oracle.com>
Subject: Re: [Xen-devel] [PATCH 3/4] xen/interface: don't discard pending
 work in FRONT/BACK_RING_ATTACH
Message-ID: <20191209114137.GT980@Air-de-Roger>
References: <20191205140123.3817-1-pdurrant@amazon.com>
 <20191205140123.3817-4-pdurrant@amazon.com>
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On Thu, Dec 05, 2019 at 02:01:22PM +0000, Paul Durrant wrote:
> Currently these macros will skip over any requests/responses that are
> added to the shared ring whilst it is detached. This, in general, is not
> a desirable semantic since most frontend implementations will eventually
> block waiting for a response which would either never appear or never be
> processed.
> 
> NOTE: These macros are currently unused. BACK_RING_ATTACH(), however, will
>       be used in a subsequent patch.
> 
> Signed-off-by: Paul Durrant <pdurrant@amazon.com>

Those headers come from Xen, and should be modified in Xen first and
then imported into Linux IMO.

Thanks, Roger.