On Mon, 28 Sep 2015, Arnd Bergmann wrote:
The sfc driver internally uses a time format based on 32-bit (unsigned) seconds and 32-bit nanoseconds. This means it will overflow in 2106, but the value we pass into it is a signed 32-bit tv_sec that already overflows in 2038 to a negative value.
This patch changes the logic to use the lower 32 bits of the timespec64 tv_sec in efx_ptp_ns_to_s_ns, which will have the correct value beyond the overflow. While this does not change any of the register values, it lets us keep using the driver after we deprecate the use of the timespec type in the kernel.
In the efx_ptp_process_times function, the change to use timespec64 is similar, in that the tv_sec portion is ignored anyway and we only care about the nanosecond portion that remains unchanged.
Signed-off-by: Arnd Bergmann arnd@arndb.de
Reviewed-by: Thomas Gleixner tglx@linutronix.de