From: Arnd Bergmann <arnd@arndb.de>
To: Ingo Molnar <mingo@kernel.org>
Cc: John Stultz <john.stultz@linaro.org>,
lkml <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Miroslav Lichvar <mlichvar@redhat.com>,
Richard Cochran <richardcochran@gmail.com>,
Prarit Bhargava <prarit@redhat.com>,
Stephen Boyd <stephen.boyd@linaro.org>
Subject: Re: [PATCH 3/4] y2038: time: Introduce struct __kernel_old_timeval
Date: Wed, 14 Mar 2018 23:02:10 +0100 [thread overview]
Message-ID: <CAK8P3a1PGEk2WDQU8i7H64Cw4dmYaJ-6vPLzW_2o23PTgm74JA@mail.gmail.com> (raw)
In-Reply-To: <20180310081123.thin6wphgk7tongy@gmail.com>
On Sat, Mar 10, 2018 at 9:11 AM, Ingo Molnar <mingo@kernel.org> wrote:
>
>> +extern struct __kernel_old_timeval ns_to_kernel_old_timeval(const s64 nsec);
>
> Generally there's no need to mark arguments with arithmethic types as const, as
> they are never modified in the calling scope.
Sure. Here I just copied from the neighboring line, but that's an obvious
change.
>> + * legacy timeval structure, only embedded in structures that
>> + * traditionally used 'timeval' to pass time intervals (not absolute
>> + * times). Do not add new users. If user space fails to compile
>> + * here, this is probably because it is not y2038 safe and needs to
>> + * be changed to use another interface.
>> + */
>> +struct __kernel_old_timeval {
>> + __kernel_long_t tv_sec; /* seconds */
>> + __kernel_long_t tv_usec; /* seconds */
>
> s/seconds/microseconds
Right.
>> +struct __kernel_old_timeval ns_to_kernel_old_timeval(const s64 nsec)
>> +{
>> + struct timespec64 ts = ns_to_timespec64(nsec);
>> + struct __kernel_old_timeval tv;
>> +
>> + tv.tv_sec = ts.tv_sec;
>> + tv.tv_usec = (suseconds_t) ts.tv_nsec / 1000;
>
> Is ts.tv_nsec guaranteed to never have bits set in the high 32 bits?
Yes, ns_to_timespec64() produces a valid timespec64 structure.
> In any case, the space before the type cast is a bit confusing to me, I think it
> should be written as:
>
> tv.tv_usec = (suseconds_t)ts.tv_nsec / 1000;
>
> To better show was the higher precedence of the cast is going to result in.
Sure.
Thanks for taking a look, I'll send an updated version.
Arnd
next prev parent reply other threads:[~2018-03-14 22:02 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-09 18:42 [GIT PULL][PATCH 0/4] Timekeeping queue for 4.17 John Stultz
2018-03-09 18:42 ` [PATCH 1/4] timekeeping: Don't align frequency adjustments to ticks John Stultz
2018-03-10 9:12 ` [tip:timers/core] timekeeping/ntp: Don't align NTP " tip-bot for Miroslav Lichvar
2018-03-09 18:42 ` [PATCH 2/4] timekeeping: Determine multiplier directly from NTP tick length John Stultz
2018-03-10 9:13 ` [tip:timers/core] timekeeping/ntp: Determine the " tip-bot for Miroslav Lichvar
2018-03-09 18:42 ` [PATCH 3/4] y2038: time: Introduce struct __kernel_old_timeval John Stultz
2018-03-10 8:11 ` Ingo Molnar
2018-03-14 22:02 ` Arnd Bergmann [this message]
2018-03-14 22:04 ` [PATCH] [v2] y2038: introduce " Arnd Bergmann
2018-03-15 8:44 ` Thomas Gleixner
2018-03-15 15:46 ` Arnd Bergmann
2018-03-09 18:42 ` [PATCH 4/4] x86: rtc: Stop using rtc deprecated functions John Stultz
2018-03-15 8:52 ` [tip:x86/cleanups] x86/rtc: Stop using " tip-bot for Benjamin Gaignard
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