[PATCH] [repost] Drivers: hv: vmbus: Offload the handling of channels to two workqueues

[Dexuan Cui]

> From: KY Srinivasan <kys at microsoft.com>
> Sent: Friday, November 30, 2018 9:31 AM
> > From: Dexuan Cui <decui at microsoft.com>
> > Sent: Thursday, November 29, 2018 12:17 AM
> > To: gregkh at linuxfoundation.org
> > Cc: KY Srinivasan <kys at microsoft.com>; Haiyang Zhang
> > <haiyangz at microsoft.com>; Stephen Hemminger
> > <sthemmin at microsoft.com>; linux-kernel at vger.kernel.org;
> > devel at linuxdriverproject.org; apw at canonical.com; vkuznets
> > <vkuznets at redhat.com>; olaf at aepfle.de; jasowang at redhat.com; Michael
> > Kelley <mikelley at microsoft.com>
> > Subject: RE: [PATCH] [repost] Drivers: hv: vmbus: Offload the handling of
> > channels to two workqueues
> >
> > > From: gregkh at linuxfoundation.org <gregkh at linuxfoundation.org>
> > > Sent: Wednesday, November 28, 2018 11:45 PM
> > > >
> > > > There is no change in this repost. I just rebased this patch to today's
> > > > char-misc's char-misc-next branch. Previously KY posted the patch with
> > his
> > > > Signed-off-by (which is kept in this repost), but there was a conflict issue.
> > > >
> > > > Note: the patch can't be cleanly applied to char-misc's char-misc-linus
> > branch
> > > --
> > > > to do that, we need to cherry-pick the supporting patch first:
> > > > 4d3c5c69191f ("Drivers: hv: vmbus: Remove the useless API
> > > vmbus_get_outgoing_channel()")
> > >
> > > That is not going to work for the obvious reason that this dependant
> > > patch is not going to be merged into 4.20-final.
> >
> > It looks the dependent patch (4d3c5c69191f) is going to miss the v4.20
> > release.
> > This is not a big issue, as the dependent patch isn't really important.
> >
> > > So, what do you expect us to do here?  The only way this can be accepted
> > > is to have it go into my -next branch, which means it will show up in
> > > 4.21-rc1, is that ok?
> >
> > Is there any chance for this patch ("Drivers: hv: vmbus: Offload the handling
> > ...") to
> > go into v4.20?
> >
> > If yes, I can quickly do a rebase to char-misc's char-misc-linus branch,
> > because actually the conflict can be very easily fixed. And I can help to fix any
> > conflict when the dependent patch is backported to v4.20.1.
> 
> This patch fixes an important bug while the patch this depends on is not
> critical.
> I suggest we revert the patch that this patch depends on
> and we can submit a new version of this patch that can go in now - into 4.20
> release.
> 
> K. Y

I agree.

Hi Greg,
Please let us know what we can do to try to push this important fix into v4.20.

Actually it's straightforward, though it looks big. And, we ave done a full testing
with the patch.

Thanks,
--Dexuan