If I do: save_flags(); cli(); ...something that takes time... (system countdown timer happens to reach zero) ...more time passes... restore_flags(); If the system countdown timer reaches zero while interrupts are disabled, is the system timer_interrupt() routine always handled after the restore_flags()? Dave -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/