Messages in this thread |  | | | Date | Mon, 13 Mar 2006 11:51:55 -0800 | | From | Andrew Morton <> | | Subject | Re: More than 8 CPUs detected and CONFIG_X86_PC cannot handle it on 2.6.16-rc6 |
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Ashok Raj <ashok.raj@intel.com> wrote: > > When CONFIG_HOTPLUG_CPU is turned on we always use physflat mode (bigsmp) even > when #of CPUs are less than 8 to avoid sending IPI to offline processors. > > Without having BIGSMP on it spits out a warning during boot on systems that > seems misleading, since it complains even on systems that have less > than 8 cpus. > > ... > > --- linux-2.6.16-rc6-mm1.orig/arch/i386/Kconfig > +++ linux-2.6.16-rc6-mm1/arch/i386/Kconfig > @@ -760,7 +760,7 @@ config PHYSICAL_START > > config HOTPLUG_CPU > bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" > - depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER > + depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER && (X86_GENERICARCH || X86_BIGSMP) > ---help--- > Say Y here to experiment with turning CPUs off and on. CPUs > can be controlled through /sys/devices/system/cpu.
One of the main reasons for turning on CONFIG_HOTPLUG_CPU on x86 is actually for suspend-to-disk on SMP. I don't think it's desirable to force all those little machines to use X86_GENERICARCH || X86_BIGSMP. And it'd be good to make that warning go away for 2.6.16. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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