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Re: [Xen-devel] [PATCH v3 2/2] argo: correctly report pending message length
- To: Nicholas Tsirakis <niko.tsirakis@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 12 Jun 2019 13:47:09 +0100
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- Cc: Nicholas Tsirakis <tsirakisn@xxxxxxxxxxxx>, Christopher Clark <christopher.w.clark@xxxxxxxxx>
- Delivery-date: Wed, 12 Jun 2019 12:47:20 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 12/06/2019 13:34, Nicholas Tsirakis wrote:
> When a message is requeue'd in Xen's internal queue, the queue
> entry contains the length of the message so that Xen knows to
> send a VIRQ to the respective domain when enough space frees up
> in the ring. Due to a small bug, however, Xen doesn't populate
> the length of the msg if a given write fails, so this length is
> always reported as zero. This causes Xen to spurriously wake up
> a domain even when the ring doesn't have enough space.
>
> This patch makes sure that the msg len is properly reported by
> populating it in the event of a write failure.
>
> Signed-off-by: Nicholas Tsirakis <tsirakisn@xxxxxxxxxxxx>
> ---
Just as a note for future patches, it is expected to have a changelog
here so reviewers can see what has changed from the previous version.
As this is mainly between you and Chris, its probably fine for now, but
https://lists.xenproject.org/archives/html/xen-devel/2019-06/msg00765.html
is a good recent example. It is freeform text, and as long as its clear
to follow, it should be fine however you chose to format it.
~Andrew
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