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Starting from Linux kernel 5.6, the timespec type was replaced by timespec64
replace timespec usage with timespec64 in newer kernel versions to maintain compatibility and avoid potential issues related to the Year 2038 problem.
in newer kernel versions, getnstimeofday() has been deprecated, and it is recommended to use the ktime_get_real_ts64() function instead
method timespec_sub are deprecated in favor of timespec64_sub
ACCESS_ONCE macro has been deprecated in favor of the READ_ONCE and WRITE_ONCE macros
use timespec64_to_ns with the timespec64 structure to avoid issues with the deprecated timespec