Hi, On Mon, Jan 21, 2013 at 7:23 PM, Steven Rostedt <rost...@goodmis.org> wrote: > commit f96972f2dc "kernel/sys.c: call disable_nonboot_cpus() in > kernel_restart()" > > added a call to disable_nonboot_cpus() on kernel_restart(), which tries > to shutdown all the CPUs except the first one. The issue with the PA > Semi, is that it does not support CPU hotplug. > > When the call is made to __cpu_down(), it calls the notifiers > CPU_DOWN_PREPARE, and then tries to take the CPU down. > > One of the notifiers to the CPU hotplug code, is the cpufreq. The > DOWN_PREPARE will call __cpufreq_remove_dev() which calls > cpufreq_driver->exit. The PA Semi exit handler unmaps regions of I/O > that is used by an interrupt that goes off constantly > (system_reset_common, but it goes off during normal system operations > too). I'm not sure exactly what this interrupt does.
On this version of the power architecture, the system comes back through the reset vector when returning from some of the lower-power idle states, which should be why you see those exceptions go off. Thanks for catching this. I have a system that I try booting a few times every release cycle, but I must have missed checking if reboots still work. Glad to see you're keeping yours alive, it's becoming a collectible. :-) [...] > Cc: Olof Johansson <o...@lixom.net> > Signed-off-by: Steven Rostedt <rost...@goodmis.org> Acked-by: Olof Johansson <o...@lixom.net> Ben, please apply for 3.8. -Olof _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
