timekeeping: add arch_offset hook to ktime_get functions
ktime_get and ktime_get_ts were calling timekeeping_get_ns() but later they were not calling arch_gettimeoffset() so architectures using this mechanism returned 0 ns when calling these functions. This happened for example when running Busybox's ping which calls syscall(__NR_clock_gettime, CLOCK_MONOTONIC, ts) which eventually calls ktime_get. As a result the returned ping travel time was zero. CC: stable@kernel.org Signed-off-by: Hector Palacios <hector.palacios@digi.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
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