timers: Use del_timer_sync() even on UP
del_timer_sync() is assumed to be pointless on uniprocessor systems and can be mapped to del_timer() because in theory del_timer() can never be invoked while the timer callback function is executed. This is not entirely true because del_timer() can be invoked from interrupt context and therefore hit in the middle of a running timer callback. Contrary to that del_timer_sync() is not allowed to be invoked from interrupt context unless the affected timer is marked with TIMER_IRQSAFE. del_timer_sync() has proper checks in place to detect such a situation. Give up on the UP optimization and make del_timer_sync() unconditionally available. Co-developed-by: NSteven Rostedt <rostedt@goodmis.org> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Tested-by: NGuenter Roeck <linux@roeck-us.net> Reviewed-by: NJacob Keller <jacob.e.keller@intel.com> Reviewed-by: NAnna-Maria Behnsen <anna-maria@linutronix.de> Link: https://lore.kernel.org/all/20220407161745.7d6754b3@gandalf.local.home Link: https://lore.kernel.org/all/20221110064101.429013735@goodmis.org Link: https://lore.kernel.org/r/20221123201624.888306160@linutronix.de
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