On 30.11.2015 15:16, Theodore Ts'o wrote:

On Sun, Nov 29, 2015 at 10:30:39PM +0100, Arnd Bergmann wrote:

quoted

The other large missing piece is the system call implementation. I have
posted a series earlier this year before my parental leave, and it's
currently lacking review from libc folks, and blocked on me to update
the series and post it again.

I assume that this also means there hasn't been much thought about
userspace support above libc?  i.e., how to take a 64-bit time64_t (or
changing the size of time_t) and translating that to a string using
some kind of version of ctime() and asctime(), and how to parse a
post-2038 date string and turning it into a 64-bit time_t on a 32-bit
platform?

   Arnd, I would just like to tell you how much I welcome your decision 
for a new __kernel_time64_t!
   As a time[64]_t is basically well defined counting artificial seconds 
since the epoch (1970-01-01 00:00) where every year divisible by four is 
a leap year that is for the meanwhile already sufficient to make use of 
your new type. I just think about the Mayan calendar application which I 
have implemented last year (Though I have not brought it to a 
publishable state yet). A single typedef should be sufficient to let it 
make use of time64_t (it directly uses this type as well as long long 
internally for its calculations rather than the glibc time format 
functions).