netdev - Re: [PATCH 3/4] net: ipv4: tcp_probe: Replace timespec with timespec64

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Message-ID: <CABeXuvpuSCQx9JQbJLpR1cCKAFZc5L5ta-rrf2X=WhCy46kt7w@mail.gmail.com>
Date:	Sat, 27 Feb 2016 08:26:05 +0530
From:	Deepa Dinamani <deepa.kernel@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Linux Network Devel Mailing List <netdev@...r.kernel.org>,
	y2038@...ts.linaro.org, "David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH 3/4] net: ipv4: tcp_probe: Replace timespec with timespec64

On Thu, Feb 25, 2016 at 8:31 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wednesday 24 February 2016 23:07:10 Deepa Dinamani wrote:
>> TCP probe log timestamps use struct timespec which is
>> not y2038 safe. Even though timespec might be good enough here
>> as it is used to represent delta time, the plan is to get rid
>> of all uses of timespec in the kernel.
>> Replace with struct timespec64 which is y2038 safe.
>>
>> Prints still use unsigned long format and type.
>> This is because long is 64 bit on 64 bit systems and 32 bit on
>> 32 bit systems. Hence, time64_t(64 bit signed number) does not
>> have a specifier that matches on both architectures.
>
> Actually time64_t is always 'long long', but tv_sec is time_t
> (long) instead of time64_t on 64-bit architectures.
>
> Using a %ll format string and a cast to s64 would work as well,
> but as you say above, it's not important here.

You are right. A cast to u64 would work as well.
I missed that the size of long long on 64 bit architectures according
to all current
data models is equivalent to long.

I will leave the prints to be in long format.
But, will reword the commit text in v2.

Thanks,
-Deepa