linux-kernel - Re: [RFC PATCH 6/7] uapi: sound: Avoid using timespec for struct snd_ctl_elem

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Date:   Wed, 27 Sep 2017 05:54:54 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Takashi Sakamoto <o-takashi@...amocchi.jp>,
        SF Markus Elfring <elfring@...rs.sourceforge.net>,
        Dan Carpenter <dan.carpenter@...cle.com>, jeeja.kp@...el.com,
        Vinod Koul <vinod.koul@...el.com>, dharageswari.r@...el.com,
        guneshwor.o.singh@...el.com, Bhumika Goyal <bhumirks@...il.com>,
        gudishax.kranthikumar@...el.com, Naveen M <naveen.m@...el.com>,
        hardik.t.shah@...el.com, Arvind Yadav <arvind.yadav.cs@...il.com>,
        Fabian Frederick <fabf@...net.be>,
        Mark Brown <broonie@...nel.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        alsa-devel@...a-project.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 6/7] uapi: sound: Avoid using timespec for struct snd_ctl_elem_value

On 21 September 2017 at 20:58, Arnd Bergmann <arnd@...db.de> wrote:
> On Thu, Sep 21, 2017 at 8:18 AM, Baolin Wang <baolin.wang@...aro.org> wrote:
>> The struct snd_ctl_elem_value will use 'timespec' type variables to record
>> timestamp, which is not year 2038 safe on 32bits system.
>>
>> Since there are no drivers will implemented the tstamp member of the
>> struct snd_ctl_elem_value, and also the stucture size will not be changed
>> if we change timespec to s64 for tstamp member of struct snd_ctl_elem_value.
>>
>> Thus we can simply change timespec to s64 for tstamp member to avoid
>> using the type which is not year 2038 safe on 32bits system.
>>
>> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
>> ---
>>  include/uapi/sound/asound.h |    4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
>> index 1949923..71bce52 100644
>> --- a/include/uapi/sound/asound.h
>> +++ b/include/uapi/sound/asound.h
>> @@ -943,8 +943,8 @@ struct snd_ctl_elem_value {
>>                 } bytes;
>>                 struct snd_aes_iec958 iec958;
>>         } value;                /* RO */
>> -       struct timespec tstamp;
>> -       unsigned char reserved[128-sizeof(struct timespec)];
>> +       struct { s64 tv_sec; s64 tv_nsec; } tstamp;
>> +       unsigned char reserved[128-sizeof(struct { s64 tv_sec; s64 tv_nsec; })];
>>  };
>
> Maybe we should enforce that nobody uses the timespec field, by
> enclosing it in #ifdef __KERNEL__ (with a matching length below it);

OK.

-- 
Baolin.wang
Best Regards