linux-kernel - Re: [PATCH] openvswitch: use ktime_get_ts64() instead of ktime_get

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Message-ID: <CAOrHB_AqrW=46=YbyMi8LvoFmcTvFXD8epTmJz5DmBNTqOGiCw@mail.gmail.com>
Date:   Tue, 28 Nov 2017 10:29:56 +0530
From:   Pravin Shelar <pshelar@....org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Pravin Shelar <pshelar@...ira.com>,
        "David S. Miller" <davem@...emloft.net>, y2038@...ts.linaro.org,
        Tonghao Zhang <xiangxia.m.yue@...il.com>,
        Jiri Benc <jbenc@...hat.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Jarno Rajahalme <jarno@....org>,
        Yi-Hung Wei <yihung.wei@...il.com>,
        Yi Yang <yi.y.yang@...el.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        ovs dev <dev@...nvswitch.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] openvswitch: use ktime_get_ts64() instead of ktime_get_ts()

On Mon, Nov 27, 2017 at 5:11 PM, Arnd Bergmann <arnd@...db.de> wrote:
> timespec is deprecated because of the y2038 overflow, so let's convert
> this one to ktime_get_ts64(). The code is already safe even on 32-bit
> architectures, since it uses monotonic times. On 64-bit architectures,
> nothing changes, while on 32-bit architectures this avoids one
> type conversion.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  net/openvswitch/flow.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
> index dbe2379329c5..76d050aba7a4 100644
> --- a/net/openvswitch/flow.c
> +++ b/net/openvswitch/flow.c
> @@ -56,12 +56,12 @@
>
>  u64 ovs_flow_used_time(unsigned long flow_jiffies)
>  {
> -       struct timespec cur_ts;
> +       struct timespec64 cur_ts;
>         u64 cur_ms, idle_ms;
>
> -       ktime_get_ts(&cur_ts);
> +       ktime_get_ts64(&cur_ts);
>         idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
> -       cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
> +       cur_ms = (u64)(u32)cur_ts.tv_sec * MSEC_PER_SEC +

I am not sure why is tv_sec converted to u32.

>                  cur_ts.tv_nsec / NSEC_PER_MSEC;
>
>         return cur_ms - idle_ms;
> --
> 2.9.0
>