Hi, raja wrote: > Would you please explain me wht is the concept of "double-acquire > deadlock" spin_lock(&my_lock); spin_lock(&my_lock); => Deadlock. Instead of asking thousands of questions, can you please read http://greenteapress.com/semaphores/downey05semaphores.pdf first ? Sincerly, Thomas -- Thomas Petazzoni thomas.petazzoni@xxxxxxxx -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/