linux-kernel - Re: [Y2038] [PATCH V2] hp

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Date:	Fri, 23 Oct 2015 17:31:58 +0800
From:	Pingbo Wen <pingbo.wen@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>, y2038@...ts.linaro.org
Cc:	dmitry.torokhov@...il.com, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org
Subject: Re: [Y2038] [PATCH V2] hp_sdc: fixed y2038 problem



On Friday, October 23, 2015 05:25 PM, Arnd Bergmann wrote:
> On Friday 23 October 2015 16:53:26 WEN Pingbo wrote:
>> 1. Converting timeval to ktime_t, and there is no need to handle sec and
>> usec separately
>>
>> 2. hp_sdc.rtv is only used for time diff, monotonic time is better here
>>
>> Signed-off-by: WEN Pingbo <pingbo.wen@...aro.org>
>> ---
> 
> This version is still correct and looks better than the first version, but
> I'd still like you to improve some details:
> 
> - read some other changelogs and follow the common style. In particular,
>   in the subject line say /what/ you do ("e.g. use ktime_get instead of
>   do_gettimeofday",  or "avoid using struct timespec") instead of /why/,
>   but then explain in the changelog text what is wrong with the current
>   version and why it gets changed like this.
> 
> - Below the '---', add a short list of things you have changed since
>   the previous versions. This part will not get copied into the git
>   history.
> 

Ok, I will fix this in the next version.

>> -		do_gettimeofday(&tv);
>> -		if (tv.tv_sec > hp_sdc.rtv.tv_sec)
>> -			tv.tv_usec += USEC_PER_SEC;
>> -
>> -		if (tv.tv_usec - hp_sdc.rtv.tv_usec > HP_SDC_MAX_REG_DELAY) {
>> +		if (time_diff.tv64 > HP_SDC_MAX_REG_DELAY) {
>>  			hp_sdc_transaction *curr;
>>  			uint8_t tmp;
>>  
>> -			printk(KERN_WARNING PREFIX "read timeout (%ius)!\n",
>> -			       (int)(tv.tv_usec - hp_sdc.rtv.tv_usec));
>> +			printk(KERN_WARNING PREFIX "read timeout (%llins)!\n",
>> +			       time_diff.tv64);
>>  			curr->idx += hp_sdc.rqty;
>>  			hp_sdc.rqty = 0;
>>  			tmp = curr->seq[curr->actidx];
> 
> A tiny style comment here: please use ktime_to_ns() to extract the
> nanoseconds out of the ktime_t type rather than accessing the tv64
> member directly.

Same here.

Thank you
Pingbo

> 
> 	Arnd
> 
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