From: Pingbo Wen <pingbo.wen@linaro.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: y2038@lists.linaro.org, dmitry.torokhov@gmail.com,
linux-kernel@vger.kernel.org, linux-input@vger.kernel.org
Subject: Re: [PATCH] hil_mlc: convert timeval to timespec64
Date: Fri, 23 Oct 2015 20:34:50 +0800 [thread overview]
Message-ID: <D1043A13-EDCD-48C7-BA2B-CE4FCFC73338@linaro.org> (raw)
In-Reply-To: <5201254.PnVcGHTDmH@wuerfel>
> 在 2015年10月23日，17:45，Arnd Bergmann <arnd@arndb.de> 写道：
>
> On Friday 23 October 2015 17:12:38 Pingbo Wen wrote:
>> On Monday, October 19, 2015 04:58 PM, Arnd Bergmann wrote:
>>>> - do_gettimeofday(&tv);
>>>> -
> Handling the jiffies overflow is trivially done through the time_before()
> and time_after() helpers, like
>
>
> start = jiffies;
> ...
> now = jiffies;
> timeout = start + HZ * timeout_usec / USEC_PER_SEC;
> if (time_after(now, start + timeout_jiffies)
> timeout();
> else
> mod_timer(timer, start + timeout_jiffies);
>
> The time_after function works because unsigned overflow is well-defined
> in C (unlike signed overflow).
>
Make sense, I will try this in next version.
Thanks,
Pingbo
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next prev parent reply other threads:[~2015-10-23 12:34 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-18 9:45 [PATCH] hil_mlc: convert timeval to timespec64 WEN Pingbo
2015-10-19 8:58 ` [Y2038] " Arnd Bergmann
2015-10-23 9:12 ` Pingbo Wen
2015-10-23 9:45 ` Arnd Bergmann
2015-10-23 12:34 ` Pingbo Wen [this message]
2015-10-24 4:00 ` [PATCH V3 1/2] hil_mlc: convert timeval to time64_t WEN Pingbo
2015-10-24 4:00 ` [PATCH V3 2/2] hil_mlc: convert timeval to jiffies WEN Pingbo
2015-10-23 9:24 ` [PATCH V2] hil_mlc: convert timeval to ktime_t WEN Pingbo
2015-10-23 9:55 ` [Y2038] " Arnd Bergmann
2015-10-23 12:32 ` Pingbo Wen
2015-10-23 13:51 ` Arnd Bergmann
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