Hi, A very newbie question on locking. LDD3 talks about spin_lock_irqsave and spin_unlock_restore and mentions that the two _must_ be called from the same function or the code might break on some architecture. I searched for this on google and found that one of the platform on which it can break is sparc. However in the implementation of timers (kernel/timer.c) in the function __mod_timer the spin_lock_irqsave and spin_unlock_restore are being called from different functions. Of course the flag variable used is same in both cases but this differs from what I have read. So how does this work ? I am using 2.6.15.7 and 2.6.17.3 kernel. - Regards, Ranjan -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
