timers: Replace BUG_ON()s
The timer code still has a few BUG_ON()s left which are crashing the kernel in situations where it still can recover or simply refuse to take an action. Remove the one in the hotplug callback which checks for the CPU being offline. If that happens then the whole hotplug machinery will explode in colourful ways. Replace the rest with WARN_ON_ONCE() and conditional returns where appropriate. 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/r/20221123201624.769128888@linutronix.de
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