linux-kernel - Re: [PATCH 2/2] MIPS: Convert update_persistent_clock() to update_persistent

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Message-ID: <CAMz4ku+WbtBGGcmsYmMexxcBTJONHF3J-T8Sxo7wgHoZZCVt1w@mail.gmail.com>
Date:   Fri, 4 May 2018 14:23:13 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "Maciej W. Rozycki" <macro@...ux-mips.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>, chenhc@...ote.com,
        Kate Stewart <kstewart@...uxfoundation.org>,
        gregkh <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Mark Brown <broonie@...nel.org>,
        Paul Burton <paul.burton@...s.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "open list:RALINK MIPS ARCHITECTURE" <linux-mips@...ux-mips.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] MIPS: Convert update_persistent_clock() to update_persistent_clock64()

On 4 May 2018 at 06:31, Arnd Bergmann <arnd@...db.de> wrote:
> On Wed, May 2, 2018 at 10:53 PM, Baolin Wang <baolin.wang@...aro.org> wrote:
>> diff --git a/arch/mips/include/asm/time.h b/arch/mips/include/asm/time.h
>> index 17d4cd2..c4e2a1a 100644
>> --- a/arch/mips/include/asm/time.h
>> +++ b/arch/mips/include/asm/time.h
>> @@ -27,8 +27,8 @@
>>   *     rtc_mips_set_mmss - similar to rtc_set_time, but only min and sec need
>>   *                     to be set.  Used by RTC sync-up.
>>   */
>> -extern int rtc_mips_set_time(unsigned long);
>> -extern int rtc_mips_set_mmss(unsigned long);
>> +extern int rtc_mips_set_time(time64_t);
>> +extern int rtc_mips_set_mmss(time64_t);
>>
>
> I think these should just get removed, and each implementation replaced
> with a direct update_persistent_clock64() function.

I thought this was one minor modification that will reduce the risk of
introducing other issues, but as you suggested we can do some complete
cleanup by removing set_mmss/set_time. OK, I will do that.

>
>> -int update_persistent_clock(struct timespec now)
>> +int update_persistent_clock64(struct timespec64 now)
>>  {
>>         return rtc_mips_set_mmss(now.tv_sec);
>>  }
>
> And this one also removed

Sure.

>
>> @@ -69,7 +69,7 @@ int proc_dolasatrtc(struct ctl_table *table, int write,
>>                 if (rtctmp < 0)
>>                         rtctmp = 0;
>>         }
>> -       r = proc_dointvec(table, write, buffer, lenp, ppos);
>> +       r = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
>>         if (r)
>>                 return r;
>>
>> @@ -224,7 +224,7 @@ int proc_lasat_prid(struct ctl_table *table, int write,
>>         {
>>                 .procname       = "rtc",
>>                 .data           = &rtctmp,
>> -               .maxlen         = sizeof(int),
>> +               .maxlen         = sizeof(time64_t),
>>                 .mode           = 0644,
>>                 .proc_handler   = proc_dolasatrtc,
>>         },
>
> Something seems wrong here: time64_t is not the same as 'unsigned long',
> and the 'rtctmp' variable is still 'unsigned int'. Not sure what the right fix
> would be (we don't seem to have a sysctl helper for s64), but the change
> here makes it worse.

After checking again, I agree with you. So I will keep the original code here.

-- 
Baolin.wang
Best Regards