From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zefan Li Subject: Re: [PATCH] cpuset: Replace all instances of time_t with time64_t Date: Thu, 26 Nov 2015 20:08:42 +0800 Message-ID: <5656F64A.609@huawei.com> References: <2798266.9VZu01a7d1@wuerfel> <20151125190150.GA14240@htj.duckdns.org> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20151125190150.GA14240-piEFEHQLUPpN0TnZuCh8vA@public.gmane.org> Sender: cgroups-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Tejun Heo , Arnd Bergmann Cc: cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Heena Sirwani , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, y2038-cunTk1MwBs8s++Sfvej+rw@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, John Stultz 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 >> Reviewed-by: Arnd Bergmann >> Signed-off-by: Arnd Bergmann > > Applied to cgroup/for-4.5. > Acked