linux-kernel - Re: [PATCH AUTOSEL 6.0 13/44] clocksource/drivers/hyperv: add data structure for reference TSC MSR

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Message-ID: <Y4DhxthMYGtYByX4@liuwe-devbox-debian-v2>
Date:   Fri, 25 Nov 2022 15:39:50 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: [PATCH AUTOSEL 6.0 13/44] clocksource/drivers/hyperv: add data
 structure for reference TSC MSR

On Thu, Nov 24, 2022 at 10:51:06AM -0500, Sasha Levin wrote:
> On Sat, Nov 19, 2022 at 05:37:16AM +0000, Michael Kelley (LINUX) wrote:
> > From: Sasha Levin <sashal@...nel.org> Sent: Friday, November 18, 2022 6:11 PM
> > > 
> > > From: Anirudh Rayabharam <anrayabh@...ux.microsoft.com>
> > > 
> > > [ Upstream commit 4ad1aa571214e8d6468a1806794d987b374b5a08 ]
> > > 
> > > Add a data structure to represent the reference TSC MSR similar to
> > > other MSRs. This simplifies the code for updating the MSR.
> > > 
> > > Signed-off-by: Anirudh Rayabharam <anrayabh@...ux.microsoft.com>
> > > Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
> > > Link: https://lore.kernel.org/all/20221027095729.1676394-2-anrayabh@linux.microsoft.com/
> > > Signed-off-by: Wei Liu <wei.liu@...nel.org>
> > > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > 
> > Sasha -- I don't think this patch needs to be backported to any stable versions.  Anirudh
> > or Wei Liu, can you confirm?  The patch is more about enabling a new scenario than fixing a bug.
> 
> Ack, I'll drop both of the patches you've pointed out. Thanks!

Sorry for the late reply -- I think you should keep this patch and the
other one. The other patch fixes a real issue while kexec'ing in the
Linux root partition. This patch is a prerequisite for that.

Thanks,
Wei.

> 
> -- 
> Thanks,
> Sasha