Re: [linux-pm] [RFC 1/3] support powermac G5 CPU hotplug
From: Pavel Machek <hidden>
Date: 2006-12-12 13:09:16
Also in:
linux-pm
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@kernel.crashing.org>
quoted hunk ↗ jump to hunk
--- 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.