Is that true that a spinlock gets undefined when compiled on a uniprocessor system? Thus spinlocks can't be used to provide mutual exclusion between concurrently executing processes on a uniprocessor system, isn't is? /FAU -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/