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Date:	Wed, 25 Jun 2014 23:36:08 -0400
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tomi.valkeinen@...com" <tomi.valkeinen@...com>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"plagnioj@...osoft.com" <plagnioj@...osoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: Re: [PATCH] video: hyperv: hyperv_fb: refresh the VM screen by force
 on VM panic

On Tue, Jun 24, 2014 at 09:44:14PM +0000, Dexuan Cui wrote:
> >On Tue, Jun 24, 2014 at 08:29:17AM +0800, Dexuan Cui wrote:
> >> Currently the VSC has no chance to notify the VSP of the dirty rectangle on VM
> >> panic because the notification work is done in a workqueue, and in panic() the
> >> kernel typically ends up in an infinite loop, and a typical kernel config has
> >> CONFIG_PREEMPT_VOLUNTARY=y and CONFIG_PREEMPT is not set, so a context switch
> >> can't happen in panic() and the workqueue won't have a chance to run. As a
> >> result, the VM Connection window can't refresh until it's closed and we
> >> re-connect to the VM.
> >> 
> >> We can register a handler on panic_notifier_list: the handler can notify
> >> the VSC and switch the framebuffer driver to a "synchronous mode", meaning
> >> the VSC flushes any future framebuffer change to the VSP immediately.
> >> 
> >> MS-TFS: 157532
> 
> > What is this line for?
> 
> Hi Greg,
> This line is for our internal bug repository.
> We have an automated system to correlate bugs with fixes so that our test
> team knows when a bug fix has been accepted upstream and they need to
> write a new test case for it. 
> 
> The MS-TFS line has appeared in the commit description for a while if you
> search for it in 'git log'  of linux-next.
> 
> Please let us know if you have further comments.

Please don't add marker lines like this that provide no relevancy to
anyone else.  I don't allow gerrit ids for the same reason.  If you want
to refer to a public bug tracker, that's great, otherwise, don't
include it.

greg k-h
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