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Technically it's not required to set k_itimer::it_signal to NULL on exit() because there is no other thread anymore which could lookup the timer concurrently. Set it to NULL for consistency sake and add a comment to that effect. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Link: https://lore.kernel.org/r/20230425183313.196462644@linutronix.de