lkml.org 
[lkml]   [2020]   [Mar]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [Update PATCH] x86/Hyper-V: Initialize Syn timer clock when it's
From
Date
Hi Vitaly:
Thanks for your review.

On 3/30/2020 11:09 PM, Vitaly Kuznetsov wrote:
> ltykernel@gmail.com writes:
>
>> From: Tianyu Lan <Tianyu.Lan@microsoft.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@microsoft.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);
>

\
 
 \ /
  Last update: 2020-03-31 03:48    [W:0.086 / U:3.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site