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

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Date:   Mon, 9 Dec 2019 12:52:14 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     Roger Pau Monné <roger.pau@...rix.com>,
        Paul Durrant <pdurrant@...zon.com>
Cc:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        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 09.12.19 12:41, Roger Pau Monné wrote:
> 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.

In theory, yes. But the Xen variant doesn't contain the ATTACH macros.


Juergen