linux-kernel - RE: [PATCH 1/1] fbdev: hyperv_fb: Fix hang in kdump kernel when on Hyper-V Gen 2 VMs

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Message-ID:
 <SN6PR02MB4157594508B80319444C6C24D4D72@SN6PR02MB4157.namprd02.prod.outlook.com>
Date: Sun, 9 Mar 2025 04:10:20 +0000
From: Michael Kelley <mhklinux@...look.com>
To: Helge Deller <deller@....de>, "haiyangz@...rosoft.com"
	<haiyangz@...rosoft.com>, "wei.liu@...nel.org" <wei.liu@...nel.org>,
	"decui@...rosoft.com" <decui@...rosoft.com>, "javierm@...hat.com"
	<javierm@...hat.com>, "thomas.tai@...cle.com" <thomas.tai@...cle.com>
CC: "tzimmermann@...e.de" <tzimmermann@...e.de>, "kasong@...hat.com"
	<kasong@...hat.com>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, "linux-fbdev@...r.kernel.org"
	<linux-fbdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-hyperv@...r.kernel.org"
	<linux-hyperv@...r.kernel.org>
Subject: RE: [PATCH 1/1] fbdev: hyperv_fb: Fix hang in kdump kernel when on
 Hyper-V Gen 2 VMs

From: Helge Deller <deller@....de> Sent: Saturday, March 8, 2025 6:59 PM
> 
> On 2/19/25 00:01, mhkelley58@...il.com wrote:
> > From: Michael Kelley <mhklinux@...look.com>
> >
[snip]

> >
> > Reported-by: Thomas Tai <thomas.tai@...cle.com>
> > Fixes: c25a19afb81c ("fbdev/hyperv_fb: Do not clear global screen_info")
> > Signed-off-by: Michael Kelley <mhklinux@...look.com>
> > ---
> > The "Fixes" tag uses commit c25a19afb81c because that's where the problem
> > was re-exposed, and how far back a stable backport is needed. But I've
> > taken a completely different, and hopefully better, approach in the
> > solution that isn't related to the code changes in c25a19afb81c.
> >
> >   drivers/video/fbdev/hyperv_fb.c | 20 +++++++++++++-------
> >   1 file changed, 13 insertions(+), 7 deletions(-)
> 
> applied to fbdev tree.
> 

Thank you!

Related, I noticed the patch "fbdev: hyperv_fb: iounmap() the correct
memory when removing a device" is also in the fbdev for-next branch.
Wei Liu previously applied this patch to the hyperv-fixes tree (see [1])
and it's already in linux-next. Won't having it also in fbdev produce a
merge conflict?

Michael

[1] https://lore.kernel.org/linux-hyperv/Z6wHDw8BssJyQHiM@liuwe-devbox-debian-v2/