linux-kernel - Re: [PATCH 2/2] usbip: use monotonic timestamps

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Date:   Tue, 7 Nov 2017 14:10:57 -0700
From:   Shuah Khan <shuah@...nel.org>
To:     Krzysztof Opasiak <k.opasiak@...sung.com>,
        Arnd Bergmann <arnd@...db.de>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <shuahkh@....samsung.com>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH 2/2] usbip: use monotonic timestamps

On 11/07/2017 04:22 AM, Krzysztof Opasiak wrote:
> 
> 
> On 11/07/2017 11:39 AM, Arnd Bergmann wrote:
>> This gets rid of the deprecated do_gettimeofday() function in usbip.
>> The comment above vgadget_get_frame() mentions that it suffers
>> from issues with the time jumps due to suspend and settimeofday,
>> so I'm changing it to use ktime_get_ts64() to use monotonic times
>> that don't have this problem.
>>
>> I couldn't tell whether we should use CLOCK_MONOTONIC or
>> CLOCK_MONOTONIC_RAW here, the difference being the exact rate
>> when correcting for NTP. I picked monotonic time since it doesn't
>> change the speed to the existing code and should be better
>> synchronized with other machines we talk to.
>>
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> 
> Looks good to me:
> Reviewed-by: Krzysztof Opasiak <k.opasiak@...sung.com>
> 

Acked-by: Shuah Khan <shuahkh@....samsung.com>

thanks,
-- Shuah