linux-kernel - Re: [PATCH] x86/Hyper-V: Fix build error with CONFIG_HYPERV

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Date:   Mon, 26 Aug 2019 13:55:05 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
cc:     Sasha Levin <sashal@...nel.org>, lantianyu1986@...il.com,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        daniel.lezcano@...aro.org, michael.h.kelley@...rosoft.com
Subject: Re: [PATCH] x86/Hyper-V: Fix build error with
 CONFIG_HYPERV_TSCPAGE=N

On Mon, 26 Aug 2019, Vitaly Kuznetsov wrote:
> Sasha Levin <sashal@...nel.org> writes:
> 
> > On Thu, Aug 22, 2019 at 10:39:46AM +0200, Vitaly Kuznetsov wrote:
> >>lantianyu1986@...il.com writes:
> >>
> >>> From: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> >>>
> >>> Both Hyper-V tsc page and Hyper-V tsc MSR code use variable
> >>> hv_sched_clock_offset for their sched clock callback and so
> >>> define the variable regardless of CONFIG_HYPERV_TSCPAGE setting.
> >>
> >>CONFIG_HYPERV_TSCPAGE is gone after my "x86/hyper-v: enable TSC page
> >>clocksource on 32bit" patch. Do we still have an issue to fix?
> >
> > Yes. Let's get it fixed on older kernels (as such we need to tag this
> > one for stable). The 32bit TSC patch won't come in before 5.4 anyway.
> >
> > Vitaly, does can you ack this patch? It might require you to re-spin
> > your patch.
> >
> 
> Sure, no problem,
> 
> Acked-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> 
> I, however, was under the impression the patch fixes the issue with the
> newly introduced sched clock:
> 
> commit b74e1d61dbc614ff35ef3ad9267c61ed06b09051
> Author: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> Date:   Wed Aug 14 20:32:16 2019 +0800
> 
>     clocksource/hyperv: Add Hyper-V specific sched clock function
> 
> (and Fixes: tag is missing)
> 
> and this is not in mainline as of v5.3-rc6. In tip/timers/core Thomas
> already picked my "clocksource/drivers/hyperv: Enable TSC page
> clocksource on 32bit" which also resolves the issue.

No. I folded Sashas fix into the original clocksource patch and then added
yours on top.

Thanks,

	tglx