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Message-ID: <01238d57-3eee-ddee-0fa8-7e387709abbb@gmail.com>
Date: Tue, 31 Mar 2020 09:47:37 +0800
From: Tianyu Lan <ltykernel@...il.com>
To: Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: Tianyu Lan <Tianyu.Lan@...rosoft.com>,
devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
x86@...nel.org, michael.h.kelley@...rosoft.com, wei.liu@...nel.org
Subject: Re: [Update PATCH] x86/Hyper-V: Initialize Syn timer clock when it's
Hi Vitaly:
Thanks for your review.
On 3/30/2020 11:09 PM, Vitaly Kuznetsov wrote:
> ltykernel@...il.com writes:
>
>> From: Tianyu Lan <Tianyu.Lan@...rosoft.com>
>>
>> Current code initializes clock event data structure for syn timer
>> even when it's not available. Fix it.
>>
>> Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
>> ---
>> - Fix the wrong title.
>
> The new one is ... weird too :-)
>
> I think it was supposed to be something like "x86/Hyper-V: don't
> allocate clockevent device when synthetic timer is unavailable"
Good suggestion. Will update in the next version.
>
>>
>> drivers/hv/hv.c | 15 +++++++++------
>
> Which tree is this patch for? Upstream clockevent allocation has moved
> to drivers/clocksource/hyperv_timer.c
>
>> 1 file changed, 9 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
>> index 632d25674e7f..2e893768fc76 100644
>> --- a/drivers/hv/hv.c
>> +++ b/drivers/hv/hv.c
>> @@ -212,13 +212,16 @@ int hv_synic_alloc(void)
>> tasklet_init(&hv_cpu->msg_dpc,
>> vmbus_on_msg_dpc, (unsigned long) hv_cpu);
>>
>> - hv_cpu->clk_evt = kzalloc(sizeof(struct clock_event_device),
>> - GFP_KERNEL);
>> - if (hv_cpu->clk_evt == NULL) {
>> - pr_err("Unable to allocate clock event device\n");
>> - goto err;
>> + if (ms_hyperv.features & HV_MSR_SYNTIMER_AVAILABLE) {
>> + hv_cpu->clk_evt =
>> + kzalloc(sizeof(struct clock_event_device),
>> + GFP_KERNEL);
>> + if (hv_cpu->clk_evt == NULL) {
>> + pr_err("Unable to allocate clock event device\n");
>> + goto err;
>> + }
>> + hv_init_clockevent_device(hv_cpu->clk_evt, cpu);
>> }
>> - hv_init_clockevent_device(hv_cpu->clk_evt, cpu);
>>
>> hv_cpu->synic_message_page =
>> (void *)get_zeroed_page(GFP_ATOMIC);
>
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