On Fri, Oct 9, 2009 at 9:13 AM, Daniel Rodrick <[email protected]> wrote: > Hi List, > > I have few queries related to preempt_disable() and would appreciate > any answers to it. > > Firstly, Does preempt_disable() disable the preemption on all the > processors or on just the local processor?
I guess just local processor as the preempt count is maintained in current thread_info struct. Correct me if I am wrong here. > > Secondly, a preempt_disable() a sufficient synchronization technique > to guard a data that is shared only among process context code on a > Uni-processor? And on SMP? It is sufficient only in case of uni-processor (Actually spin_lock also just disables preemption in case of uni-processor) > > Lastly, is it allowable to schedule / sleep immediately after a call > to preempt_disable()? No I guess kernel will panic with some error like , "scheduling while in Atomic Context". > > Thanks & Best Regards, > > Dan > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to [email protected] > Please read the FAQ at http://kernelnewbies.org/FAQ > > -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [email protected] Please read the FAQ at http://kernelnewbies.org/FAQ
