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

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Date:	Wed, 25 Nov 2015 14:01:50 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Li Zefan <lizefan@...wei.com>, 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 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.

Thanks.

-- 
tejun
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