On 04/19/2013 01:26 PM, Ingo Molnar wrote: > > * Borislav Petkov <[email protected]> wrote: > >> On Wed, Apr 17, 2013 at 09:46:53AM +0200, Ingo Molnar wrote: >> >>> What you mention here should indeed already be handled by the architecture >>> hotplug code (for example on x86 the boot CPU cannot be hot-removed). >> >> Supposedly, some new Intels (I think Ivybridge or so) can actually be >> hot-removed. > > There are WIP patches in existence that remove the limitations on the kernel > side, > but they are not upstream yet, so currently the constraint exists upstream. >
I thought Fenghua Yu's upstream commits were supposed to handle that. Don't they? a71c8bc x86, topology: Debug CPU0 hotplug 6f5298c x86/i387.c: Initialize thread xstate only on CPU0 only once 8d966a0 x86, hotplug: Handle retrigger irq by the first available CPU 30242aa x86, hotplug: The first online processor saves the MTRR state 27fd185 x86, hotplug: During CPU0 online, enable x2apic, set_numa_node. e1c467e x86, hotplug: Wake up CPU0 via NMI instead of INIT, SIPI, SIPI 3e2a0cc x86-32, hotplug: Add start_cpu0() entry point to head_32.S 42e78e9 x86-64, hotplug: Add start_cpu0() entry point to head_64.S 6e32d47 kernel/cpu.c: Add comment for priority in cpu_hotplug_pm_callback 209efae x86, hotplug, suspend: Online CPU0 for suspend or hibernate 30106c1 x86, hotplug: Support functions for CPU0 online/offline 4d25031 x86, topology: Don't offline CPU0 if any PIC irq can not be migrated out of it 80aa1df x86, Kconfig: Add config switch for CPU0 hotplug f78cff4 doc: Add x86 CPU0 online/offline feature Regards, Srivatsa S. Bhat -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
