linux-kernel - Re: [PATCH] cpuset: Replace all instances of time_t with time64

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Message-ID: <5656F64A.609@huawei.com>
Date:	Thu, 26 Nov 2015 20:08:42 +0800
From:	Zefan Li <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>, Arnd Bergmann <arnd@...db.de>
CC:	<cgroups@...r.kernel.org>, Heena Sirwani <heenasirwani@...il.com>,
	<linux-kernel@...r.kernel.org>, <y2038@...ts.linaro.org>,
	<tglx@...utronix.de>, John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH] cpuset: Replace all instances of time_t with time64_t

On 2015/11/26 3:01, Tejun Heo wrote:
> On Wed, Nov 25, 2015 at 04:16:55PM +0100, Arnd Bergmann wrote:
>> The following patch replaces all instances of time_t with time64_t i.e.
>> change the type used for representing time from 32-bit to 64-bit. All
>> 32-bit kernels to date use a signed 32-bit time_t type, which can only
>> represent time until January 2038. Since embedded systems running 32-bit
>> Linux are going to survive beyond that date, we have to change all
>> current uses, in a backwards compatible way.
>>
>> The patch also changes the function get_seconds() that returns a 32-bit
>> integer to ktime_get_seconds() that returns seconds as 64-bit integer.
>>
>> The patch changes the type of ticks from time_t to u32. We keep ticks as
>> 32-bits as the function uses 32-bit arithmetic which would prove less
>> expensive than 64-bit arithmetic and the function is expected to be
>> called atleast once every 32 seconds.
>>
>> Signed-off-by: Heena Sirwani <heenasirwani@...il.com>
>> Reviewed-by: Arnd Bergmann <arnd@...db.de>
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
> Applied to cgroup/for-4.5.
>

Acked

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