linux-kernel - Re: [PATCH] x86/Hyper-V: Initialize Hyper-V stimer after enabling lapic

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Date:   Thu, 5 Aug 2021 20:45:43 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Praveen Kumar <kumarpraveen@...ux.microsoft.com>,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
        michael.h.kelley@...rosoft.com
Cc:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        vkuznets@...hat.com
Subject: Re: [PATCH] x86/Hyper-V: Initialize Hyper-V stimer after enabling
 lapic

Hi Praveen:
     Thanks for your review.

On 8/5/2021 2:41 PM, Praveen Kumar wrote:
>> +
>> +static void __init hv_setup_initr_mode(void)
>> +{
>> +	if (old_setup_initr_mode)
>> +		old_setup_initr_mode();
>> +
>> +	/*
>> +	 * The direct-mode STIMER depends on LAPIC and so allocate
>> +	 * STIMER after calling initr node callback.
>> +	 */
>> +	(void)hv_stimer_alloc(false);
> In my understanding, in previous implementation we were ignoring the return error as there was a fallback handling for LAPIC.
> However, I'm not seeing the same here, or am I missing something ?
> 

Nice catch. The original comment should be keep and will add back in the 
next version.