From: Wei Liu <wei.liu@kernel.org>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Tianyu Lan <ltykernel@gmail.com>,
Tianyu Lan <Tianyu.Lan@microsoft.com>,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org, Yubo Xie <yuboxie@microsoft.com>,
kys@microsoft.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, liuwe@microsoft.com,
daniel.lezcano@linaro.org, tglx@linutronix.de,
michael.h.kelley@microsoft.com, Wei Liu <wei.liu@kernel.org>
Subject: Re: [PATCH V2] x86/Hyper-V: Fix hv sched clock function return wrong time unit
Date: Mon, 30 Mar 2020 11:05:02 +0100 [thread overview]
Message-ID: <20200330100502.hh2yygyxctsmwd6o@debian> (raw)
In-Reply-To: <87k13641rg.fsf@vitty.brq.redhat.com>
On Fri, Mar 27, 2020 at 09:53:39AM +0100, Vitaly Kuznetsov wrote:
> Tianyu Lan <ltykernel@gmail.com> writes:
>
> > From: Yubo Xie <yuboxie@microsoft.com>
> >
> > sched clock callback should return time with nano second as unit
> > but current hv callback returns time with 100ns. Fix it.
> >
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Yubo Xie <yuboxie@microsoft.com>
> > Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
> > Fixes: bd00cd52d5be ("clocksource/drivers/hyperv: Add Hyper-V specific sched clock function")
> > ---
> > Change since v1:
> > Update fix commit number in change log.
> > ---
> > drivers/clocksource/hyperv_timer.c | 6 ++++--
> > 1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
> > index 9d808d595ca8..662ed978fa24 100644
> > --- a/drivers/clocksource/hyperv_timer.c
> > +++ b/drivers/clocksource/hyperv_timer.c
> > @@ -343,7 +343,8 @@ static u64 notrace read_hv_clock_tsc_cs(struct clocksource *arg)
> >
> > static u64 read_hv_sched_clock_tsc(void)
> > {
> > - return read_hv_clock_tsc() - hv_sched_clock_offset;
> > + return (read_hv_clock_tsc() - hv_sched_clock_offset)
> > + * (NSEC_PER_SEC / HV_CLOCK_HZ);
> > }
> >
> > static void suspend_hv_clock_tsc(struct clocksource *arg)
> > @@ -398,7 +399,8 @@ static u64 notrace read_hv_clock_msr_cs(struct clocksource *arg)
> >
> > static u64 read_hv_sched_clock_msr(void)
> > {
> > - return read_hv_clock_msr() - hv_sched_clock_offset;
> > + return (read_hv_clock_msr() - hv_sched_clock_offset)
> > + * (NSEC_PER_SEC / HV_CLOCK_HZ);
> > }
> >
> > static struct clocksource hyperv_cs_msr = {
>
> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Queued for hyperv-fixes. Thank you both.
Wei.
next prev parent reply other threads:[~2020-03-30 10:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-27 2:11 [PATCH V2] x86/Hyper-V: Fix hv sched clock function return wrong time unit Tianyu Lan
2020-03-27 8:53 ` Vitaly Kuznetsov
2020-03-30 10:05 ` Wei Liu [this message]
2020-03-30 10:22 ` Wei Liu
2020-03-27 11:30 ` [tip: timers/urgent] clocksource/drivers/hyper-v: Make sched clock return nanoseconds correctly tip-bot2 for Yubo Xie
2020-03-27 15:03 ` [PATCH V2] x86/Hyper-V: Fix hv sched clock function return wrong time unit Sasha Levin
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