Hi! > This patch allows "hotplugging" of CPUs on G5 machines. CPUs that are > disabled are put into an idle loop with interrupts hard-disabled, to wake > them up again we kick them just like when bringing them up. > > Maybe there's some way to actually turn off those CPUs even more? > > Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org> > > --- linux-2.6-git.orig/arch/powerpc/kernel/smp.c 2006-12-11 23:34:47.693716759 +0100 > +++ linux-2.6-git/arch/powerpc/kernel/smp.c 2006-12-11 23:37:55.017716759 +0100 > @@ -558,6 +558,9 @@ int __devinit start_secondary(void *unus > > local_irq_enable(); > > + /* who knows what context the processor might have died in... */ > + task_thread_info(paca[cpu].__current)->preempt_count = 0; > + ?? Context for downing cpu should better be well-defined. Just do this in cpu_die if it is really required. Pavel -- Thanks for all the (sleeping) penguins.
