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Posix timers with a delivery mode of SIGEV_NONE deliver no signals but the remaining expiry time must be readable via timer_gettime() for both one shot and interval timers. That's implemented correctly for regular posix timers but broken for posix CPU timers. Add a self test so the fixes can be verified. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Frederic Weisbecker <frederic@kernel.org>