Hi , Is the spin_lock() guarenteed to be atomic on SMP systems. i.e. if spin_lock() is called at the same time from both the processors will it lead to a race condition. Thanks, Ganesh -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/