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From: Arnd Bergmann <arnd@arndb.de>
Date: Fri, 22 Jun 2018 16:19:35 +0200
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Subject: Re: [PATCH 1/3] hfs: stop using timespec based interfaces
To: Viacheslav Dubeyko <slava@dubeyko.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>,
        y2038 Mailman List <y2038@lists.linaro.org>,
        Jeff Layton <jlayton@redhat.com>, Jan Kara <jack@suse.cz>,
        Deepa Dinamani <deepa.kernel@gmail.com>,
        Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Wed, Jun 20, 2018 at 9:55 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Wed, Jun 20, 2018 at 6:55 PM, Viacheslav Dubeyko <slava@dubeyko.com> wrote:
>> On Tue, 2018-06-19 at 21:42 +0200, Arnd Bergmann wrote:
>>> On Tue, Jun 19, 2018 at 7:03 PM, Viacheslav Dubeyko <slava@dubeyko.com> wrote:

>>>  /* time macros: convert between 1904-2040 and 1970-2106 range,
>>>   * pre-1970 timestamps are interpreted as post-2038 times after
>>> wrap-around */
>>> -#define __hfsp_mt2ut(t)                (be32_to_cpu(t) -
>>> 2082844800U)
>>> +#define __hfsp_mt2ut(t)                ((time64_t)be32_to_cpu(t) -
>>> 2082844800U)
>>>  #define __hfsp_ut2mt(t)                (cpu_to_be32(t +
>>> 2082844800U))
>>>
>>>  /* compatibility */
>>>
>>> I can submit that separately so that it can get backported into
>>> stable kernels if you like, with the type changes as a follow-up
>>> on top.
>>>
>>
>> Sounds good.
>
> Ok, I'll send an updated version with that patch first then.

I've now sent that patch with additional information that I got from reading the
XNU sources. Interestingly, that also uses the 1970-2106 time range that
I had in my original series, not the 1904-2040 time range that is documented.

      Arnd