netdev - Re: [PATCH 2/4] Add new timeval_to

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Message-ID: <46A59EDC.4060906@linux.vnet.ibm.com>
Date:	Tue, 24 Jul 2007 12:10:28 +0530
From:	Varun Chandramohan <varunc@...ux.vnet.ibm.com>
To:	Oliver Hartkopp <socketcan@...tkopp.net>
CC:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	sri@...ibm.com, dlstevens@...ibm.com, varuncha@...ibm.com,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/4] Add new timeval_to_sec function

Oliver Hartkopp wrote:
> Varun Chandramohan wrote:
>   
>> Patrick McHardy wrote:
>>   
>>     
>>> Varun Chandramohan wrote:
>>>   
>>>     
>>>       
>>>>  /**
>>>> + * timeval_to_sec - Convert timeval to seconds
>>>> + * @tv:         pointer to the timeval variable to be converted
>>>> + *
>>>> + * Returns the seconds representation of timeval parameter.
>>>> + */
>>>> +static inline time_t timeval_to_sec(const struct timeval *tv)
>>>> +{
>>>> +	return (tv->tv_sec + (tv->tv_usec + 500000)/1000000);
>>>> +}
>>>>     
>>>>       
>>>>         
>>> I don't think you should round down timeout values.
>>>   
>>>     
>>>       
>> Can you elaborate on that? As per the RFC of MIB ,we need only seconds
>> granularity. Taking that as the case i dont understand why round down
>> should not be done?
>>   
>>     
>
> When you like to create any timeout based on your calculated value, you
> might run into the problem that your calculated value is set to _zero_
> even if there was "some time" before the conversion. This might probably
> not what you indented to get.
>
> So what about rounding up with
>
> return (tv->tv_sec + (tv->tv_usec + 999999)/1000000);
>
> ???
>
>   
This can done.  Is this what you were ref to me, Patrick?
> Btw. isn't here already any solution based on ktime conversions?
>
>   
AFAIK there isint any conversion function to secs. Correct me if iam wrong.
But we can have a function or macro to do this conversion.
> Regards,
> Oliver
>
>
>   
Regards,
Varun
> -
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>   

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