linux-kernel - Re: [Xen-devel] [PATCH 3/4] xen/interface: don't discard pending work in FRONT/BACK_RING

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Message-ID: <20191209114137.GT980@Air-de-Roger>
Date:   Mon, 9 Dec 2019 12:41:37 +0100
From:   Roger Pau Monné <roger.pau@...rix.com>
To:     Paul Durrant <pdurrant@...zon.com>
CC:     <linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
        "Juergen Gross" <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        "Boris Ostrovsky" <boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [PATCH 3/4] xen/interface: don't discard pending
 work in FRONT/BACK_RING_ATTACH

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@...zon.com>

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

Thanks, Roger.