On Tue, Dec 04, 2007 at 11:04:18PM +1100, Michael Ellerman wrote: > On Tue, 2007-12-04 at 18:34 +0800, Li Tony wrote: > > I am not very sure about spin_lock influence. > > But maybe somebody will change the virq_to_hw implementation. > > I will take virq_to_hw instead. > > I mean the time to take the function call should be pretty small > compared to taking and releasing a spinlock - but if you have > performance numbers to prove otherwise let me know :)
I don't think the IPIC is used on any SMP platforms at the moment, so there's no spinlock overhead other than disabling interrupts... That said, it's not worth reimplementing to avoid a function call. -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev