Commits
Fenghua Yu committed f78cff48c3d
doc: Add x86 CPU0 online/offline feature If CONFIG_BOOTPARAM_HOTPLUG_CPU0 is turned on, CPU0 is hotpluggable. Otherwise, by default CPU0 is not hotpluggable and kernel parameter cpu0_hotplug enables CPU0 online/offline feature. The documentations point out two known CPU0 dependencies. First, resume from hibernate or suspend always starts from CPU0. So hibernate and suspend are prevented if CPU0 is offline. Another dependency is PIC interrupts always go to CPU0. It's said that some machines may depend on CPU0 to poweroff/reboot. But I haven't seen such dependency on a few tested machines. Please let me know if you see any CPU0 dependencies on your machine. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Link: http://lkml.kernel.org/r/1352835171-3958-2-git-send-email-fenghua.yu@intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>