linux-kernel - Re: [PATCH 6/6] cputime: Introduce cputime_to_timespec64()/timespec64_to

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Message-ID: <CAMz4kuKNVACNhwddXMyCqKGpOf_gsoHk=ZFZFuaY=8e4DCRwGw@mail.gmail.com>
Date:	Thu, 16 Jul 2015 10:22:43 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	benh@...nel.crashing.org, Arnd Bergmann <arnd@...db.de>,
	John Stultz <john.stultz@...aro.org>, peterz@...radead.org,
	paulus@...ba.org, mpe@...erman.id.au, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, linux390@...ibm.com, rth@...ddle.net,
	riel@...hat.com, cl@...ux.com, tj@...nel.org,
	Frédéric Weisbecker <fweisbec@...il.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	linux-arch@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	y2038 Mailman List <y2038@...ts.linaro.org>
Subject: Re: [PATCH 6/6] cputime: Introduce cputime_to_timespec64()/timespec64_to_cputime()

On 15 July 2015 at 19:55, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Wed, 15 Jul 2015, Baolin Wang wrote:
>
>> On 15 July 2015 at 18:31, Thomas Gleixner <tglx@...utronix.de> wrote:
>> > On Wed, 15 Jul 2015, Baolin Wang wrote:
>> >
>> >> The cputime_to_timespec() and timespec_to_cputime() functions are
>> >> not year 2038 safe on 32bit systems due to that the struct timepsec
>> >> will overflow in 2038 year.
>> >
>> > And how is this relevant? cputime is not based on wall clock time at
>> > all. So what has 2038 to do with cputime?
>> >
>> > We want proper explanations WHY we need such a change.
>>
>> When converting the posix-cpu-timers, it call the
>> cputime_to_timespec() function. Thus it need a conversion for this
>> function.
>
> There is no requirement to convert posix-cpu-timers on their own. We
> need to adopt the posix cpu timers code because it shares syscalls
> with the other posix timers, but that still does not explain why we
> need these functions.
>

In posix-cpu-timers, it also defined some 'k_clock struct' variables,
and we need to convert the callbacks of the 'k_clock struct' which are
not year 2038 safe on 32bit systems. Some callbacks which need to
convert call the cputime_to_timespec() function, thus we also want to
convert the cputime_to_timespec() function to a year 2038 safe
function to make all them ready for the year 2038 issue.

>> You can see that conversion in patch "posix-cpu-timers: Convert to
>> y2038 safe callbacks" from
>> https://git.linaro.org/people/baolin.wang/upstream_0627.git.
>
> I do not care about your random git tree. I care about proper
> changelogs. Your changelogs are just a copied boilerplate full of
> errors.
>
> Thanks,
>
>         tglx



-- 
Baolin.wang
Best Regards
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